Heimdall Research

Data

Datasets you can download and cite for free: Arctic sea ice, western lakes and U.S. storm outages are published. Every dataset is also on the API and in AI assistants. Paid plans start January 1, 2027. They add higher limits and reports.

Early access includes a free API key until December 31, 2026 (midnight US Eastern). Paid plans start January 1, 2027. Storm reports for storms already in the published tables, and the extras listed for those tables, are free with a free account. Licensed products are by quote. Plans from 2027

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  1. Published

    Bar charts of open-water days per year at four Arctic gates, 1979 to 2025.

    Arctic Open-Water Window

    Open-water days each year at 15 fixed gates in the Bering Strait, the Northwest Passage, the Northern Sea Route and Fram Strait, 1978 to 2026.

    Version 1.1, 15 gates.

    Latest day in the live feed: 22 October 2026. The published version 1.1 ends on 1 October 2026.

    Citable copy (Zenodo) · Dataset (Kaggle) · Run the notebook (Kaggle) · Discussion (Kaggle) · Load in Python (Hugging Face)

  2. Published

    Great Salt Lake south arm, July 2026, Sentinel-2 preview.

    Western Terminal Lakes

    Monthly open-water area for 19 series on 18 lakes and reservoirs since 2019, with an uncertainty range.

    Version 1.1, 19 series on 18 lakes.

    Latest gauge reading in the live feed: 24 October 2026. The monthly table in the published version 1.1 covers through September 2026.

    Citable copy (Zenodo) · Dataset (Kaggle) · Run the notebook (Kaggle) · Discussion (Kaggle) · Load in Python (Hugging Face)

  3. Published

    Step chart of night-light recovery in Puerto Rico after Hurricane Maria.

    Storm Blackout and Restoration

    County power outages and restoration for FEMA-declared storms since 2012, from utility records and satellite night light.

    Version 1.2, 672 storms.

    Citable copy (Zenodo) · Dataset (Kaggle) · Run the notebook (Kaggle) · Discussion (Kaggle) · Load in Python (Hugging Face)

The live feed is newer data from the API. It can change and is not part of the cited version.

Banner chart of daily lake gauge readings, 1902-2026. This picture is a gauge record. It is separate from the open water-area table.

Look up a storm or a lake

Two of our datasets start from a place. Find a storm or a lake below; each row says what is free and what it costs.

Storm power outages

Every FEMA-declared weather disaster and named storm since 2012, newest first. For each storm and county: customers without power at the peak and as a share of all customers, customer-hours without power, hours until half and nine-tenths were restored, the counties that took longest, what the satellite night-light record shows, and which counties FEMA declared and under which declaration. County data for every storm in the table is free to download. A storm report is free with a free account until December 31, 2026. From January 1, 2027, storm reports are included in Pro and Team. Search by storm, state, county or year, or select a heading to sort.

Storm Dates Location States Counties Status Type Year Access Scope Ends What the data shows Details Get it

Status: what the published table holds for each storm. Night light and outage run: night-light numbers and a county outage run from utility records. Night light only: night-light numbers and no outage run. Storm row only: a row in storms.csv with a reason code and no numbers. Every row is free to download.

Lake and reservoir water area

Monthly water area from satellite imagery: 19 series on 18 lakes in version 1.1. The table lists all 19: seven terminal lakes, then twelve reservoirs and lakes. Great Salt Lake is split into a north arm and a south arm. For your own lake or reservoir, weekly updates joined to its gauge records are planned. Paid plans start January 1, 2027.

Lakes 1.1. Change compares the 2019 and 2026 averages over the same months, January to September, using only months not flagged as low confidence in either year. The months differ by lake and are listed with each one.

Lake State Type Latest month (km²) Latest month Change since 2019 What the data shows Details Free and paid
Great Salt Lake, north arm Utah Terminal lake 1,148.2 2026-09 2026-09 -16.2%
  • 93 monthly values, 2019-01 to 2026-09; 33 flagged low confidence.
  • Change, 2019 and 2026: -226.4 km² (-16.2%).
  • Months compared: May to September.
  • Among months not flagged low confidence, the smallest is 1112.8 km² (2025-11) and the largest is 1451.8 km² (2019-05).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-061,191.71,191.7 to 1,285.2100%OK
2026-071,149.31,149.3 to 1,282.6100%OK
2026-081,143.51,143.5 to 1,282.3100%OK
2026-091,148.21,148.2 to 1,287.9100%OK

Sample rows from lake_monthly.csv.
State
Utah, United States
Location
41.46° N, 112.71° W
Gauge record
USGS 10010100, daily level
Change
2019 and 2026; months compared: May to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Great Salt Lake, south arm Utah Terminal lake 1,734.9 2026-09 2026-09 -13.4%
  • 93 monthly values, 2019-01 to 2026-09; 14 flagged low confidence.
  • Change, 2019 and 2026: -277.7 km² (-13.4%).
  • Months compared: March, May to September.
  • Among months not flagged low confidence, the smallest is 1711.5 km² (2022-09) and the largest is 2201.1 km² (2019-03).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-061,803.91,803.9 to 1,890.4100%OK
2026-071,770.61,770.6 to 1,866.5100%OK
2026-081,756.11,756.1 to 1,845.6100%OK
2026-091,734.91,734.9 to 1,837.3100%OK

Sample rows from lake_monthly.csv.
State
Utah, United States
Location
40.99° N, 112.52° W
Gauge record
USGS 10010000, daily level
Change
2019 and 2026; months compared: March, May to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Salton Sea California Terminal lake 756.6 2026-09 2026-09 -8.8%
  • 93 monthly values, 2019-01 to 2026-09.
  • Change, 2019 and 2026: -75.9 km² (-8.8%).
  • Months compared: January to September.
  • Among months not flagged low confidence, the smallest is 756.6 km² (2026-09) and the largest is 878.4 km² (2019-01).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06779.1779.1 to 814.2100%OK
2026-07772.0772.0 to 802.8100%OK
2026-08767.1767.1 to 793.9100%OK
2026-09756.6756.6 to 799.8100%OK

Sample rows from lake_monthly.csv.
State
California, United States
Location
33.32° N, 115.85° W
Gauge record
USGS 10254005, daily level
Change
2019 and 2026; months compared: January to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Mono Lake California Terminal lake 178.1 2026-09 2026-09 +0.0%
  • 93 monthly values, 2019-01 to 2026-09; 26 flagged low confidence.
  • Change, 2019 and 2026: +0.1 km² (+0.0%).
  • Months compared: April to September.
  • Among months not flagged low confidence, the smallest is 169.6 km² (2022-10) and the largest is 183.3 km² (2023-05).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06179.4179.4 to 187.1100%OK
2026-07178.9178.9 to 187.7100%OK
2026-08178.5178.5 to 188.0100%OK
2026-09178.1178.1 to 187.099%OK

Sample rows from lake_monthly.csv.
State
California, United States
Location
38.01° N, 119.05° W
Gauge record
No USGS series; satellite area only
Change
2019 and 2026; months compared: April to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Pyramid Lake Nevada Terminal lake 415.6 2026-09 2026-09 -0.9%
  • 93 monthly values, 2019-01 to 2026-09; 21 flagged low confidence.
  • Change, 2019 and 2026: -3.6 km² (-0.9%).
  • Months compared: April to September.
  • Among months not flagged low confidence, the smallest is 412.0 km² (2024-07) and the largest is 427.1 km² (2019-05).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06416.9416.9 to 420.7100%OK
2026-07416.5416.5 to 420.5100%OK
2026-08416.4416.4 to 421.2100%OK
2026-09415.6415.6 to 421.199%OK

Sample rows from lake_monthly.csv.
State
Nevada, United States
Location
40.01° N, 119.59° W
Gauge record
USGS 10336500, periodic field readings
Change
2019 and 2026; months compared: April to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Walker Lake Nevada Terminal lake 113.6 2026-09 2026-09 -2.8%
  • 93 monthly values, 2019-01 to 2026-09; 9 flagged low confidence.
  • Change, 2019 and 2026: -3.3 km² (-2.8%).
  • Months compared: March to September.
  • Among months not flagged low confidence, the smallest is 108.7 km² (2022-10) and the largest is 121.5 km² (2024-03).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06115.0115.0 to 117.8100%OK
2026-07114.6114.6 to 117.3100%OK
2026-08114.1114.1 to 117.0100%OK
2026-09113.6113.6 to 116.299%OK

Sample rows from lake_monthly.csv.
State
Nevada, United States
Location
38.70° N, 118.70° W
Gauge record
USGS 10288500, reported storage
Change
2019 and 2026; months compared: March to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Lake Abert Oregon Terminal lake 114.5 2026-09 2026-09 -5.0%
  • 93 monthly values, 2019-01 to 2026-09; 42 flagged low confidence.
  • Change, 2019 and 2026: -6.6 km² (-5.0%).
  • Months compared: April to September.
  • Among months not flagged low confidence, the smallest is 81.1 km² (2021-04) and the largest is 144.7 km² (2025-04).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06122.3122.3 to 139.3100%OK
2026-07119.5119.5 to 138.4100%OK
2026-08117.7117.7 to 134.8100%OK
2026-09114.5114.5 to 136.7100%OK

Sample rows from lake_monthly.csv.
State
Oregon, United States
Location
42.58° N, 120.24° W
Gauge record
USGS 10387150, daily level since 2023
Change
2019 and 2026; months compared: April to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Lake Mead Nevada and Arizona Reservoir or lake 288.1 2026-09 2026-09 -12.6%
  • 93 monthly values, 2019-01 to 2026-09; 1 flagged low confidence.
  • Change, 2019 and 2026: -44.4 km² (-12.6%).
  • Months compared: January to September.
  • Among months not flagged low confidence, the smallest is 286.6 km² (2026-08) and the largest is 368.4 km² (2020-03).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06294.6248.9 to 294.6100%OK
2026-07288.5250.3 to 288.5100%OK
2026-08286.6255.2 to 286.6100%OK
2026-09288.1247.0 to 288.1100%OK

Sample rows from lake_monthly.csv.
State
Nevada and Arizona, United States
Location
36.18° N, 114.43° W
Gauge record
Bureau of Reclamation RISE item 6123, daily level
Change
2019 and 2026; months compared: January to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Lake Powell Utah and Arizona Reservoir or lake 249.7 2026-09 2026-09 -31.0%
  • 93 monthly values, 2019-01 to 2026-09.
  • Change, 2019 and 2026: -115.4 km² (-31.0%).
  • Months compared: January to September.
  • Among months not flagged low confidence, the smallest is 242.7 km² (2026-08) and the largest is 430.9 km² (2019-08).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06251.3122.8 to 251.3100%OK
2026-07246.2147.1 to 246.2100%OK
2026-08242.7168.0 to 242.7100%OK
2026-09249.7132.0 to 249.799%OK

Sample rows from lake_monthly.csv.
State
Utah and Arizona, United States
Location
37.25° N, 111.00° W
Gauge record
Bureau of Reclamation RISE item 508, daily level
Change
2019 and 2026; months compared: January to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Elephant Butte Reservoir New Mexico Reservoir or lake 8.4 2026-09 2026-09 -33.2%
  • 93 monthly values, 2019-01 to 2026-09; 9 flagged low confidence.
  • Change, 2019 and 2026: -12.5 km² (-33.2%).
  • Months compared: January to June, August to September.
  • Among months not flagged low confidence, the smallest is 8.4 km² (2026-09) and the largest is 57.5 km² (2023-06).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-0622.821.2 to 26.7100%OK
2026-0711.49.6 to 14.4100%algae_turbid (low confidence)
2026-088.68.3 to 10.0100%OK
2026-098.48.1 to 9.9100%OK

Sample rows from lake_monthly.csv.
State
New Mexico, United States
Location
33.35° N, 107.15° W
Gauge record
Bureau of Reclamation RISE item 332, daily level
Change
2019 and 2026; months compared: January to June, August to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Falcon Reservoir Texas Reservoir or lake 109.5 2026-09 2026-09 -32.1%
  • 93 monthly values, 2019-01 to 2026-09; 17 flagged low confidence.
  • Change, 2019 and 2026: -49.8 km² (-32.1%).
  • Months compared: January to February, July to September.
  • Among months not flagged low confidence, the smallest is 77.6 km² (2025-11) and the largest is 179.0 km² (2019-01).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06114.086.7 to 122.9100%methods_disagree (low confidence)
2026-07118.9101.7 to 129.3100%OK
2026-08120.0107.2 to 130.7100%OK
2026-09109.5108.1 to 119.0100%OK

Sample rows from lake_monthly.csv.
State
Texas, United States and Mexico
Location
26.74° N, 99.24° W
Gauge record
IBWC gauge 08-4612.00, level record
Change
2019 and 2026; months compared: January to February, July to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Flaming Gorge Reservoir Wyoming and Utah Reservoir or lake 129.5 2026-09 2026-09 -13.0%
  • 93 monthly values, 2019-01 to 2026-09; 25 flagged low confidence.
  • Change, 2019 and 2026: -20.4 km² (-13.0%).
  • Months compared: April to September.
  • Among months not flagged low confidence, the smallest is 129.5 km² (2026-09) and the largest is 159.3 km² (2019-07).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06136.988.7 to 136.9100%OK
2026-07132.8108.7 to 132.8100%OK
2026-08131.0115.2 to 131.0100%OK
2026-09129.5105.8 to 129.5100%OK

Sample rows from lake_monthly.csv.
State
Wyoming and Utah, United States
Location
41.11° N, 109.56° W
Gauge record
Bureau of Reclamation RISE item 341, daily level
Change
2019 and 2026; months compared: April to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Amistad Reservoir Texas Reservoir or lake 96.7 2026-09 2026-09 -50.9%
  • 93 monthly values, 2019-01 to 2026-09; 1 flagged low confidence.
  • Change, 2019 and 2026: -85.7 km² (-50.9%).
  • Months compared: January to September.
  • Among months not flagged low confidence, the smallest is 69.2 km² (2026-04) and the largest is 180.7 km² (2019-03).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-0677.832.0 to 77.899%OK
2026-0785.625.7 to 85.690%OK
2026-0897.934.9 to 97.9100%OK
2026-0996.750.5 to 96.7100%OK

Sample rows from lake_monthly.csv.
State
Texas, United States and Mexico
Location
29.52° N, 101.14° W
Gauge record
IBWC gauge 08-4508.00, level record
Change
2019 and 2026; months compared: January to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Blue Mesa Reservoir Colorado Reservoir or lake 17.6 2026-09 2026-09 -32.9%
  • 93 monthly values, 2019-01 to 2026-09; 29 flagged low confidence.
  • Change, 2019 and 2026: -10.4 km² (-32.9%).
  • Months compared: May to September.
  • Among months not flagged low confidence, the smallest is 17.6 km² (2026-09) and the largest is 34.4 km² (2019-08).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-0623.413.5 to 23.4100%OK
2026-0721.116.0 to 21.1100%OK
2026-0819.014.5 to 19.0100%OK
2026-0917.610.3 to 17.6100%OK

Sample rows from lake_monthly.csv.
State
Colorado, United States
Location
38.47° N, 107.21° W
Gauge record
Bureau of Reclamation RISE item 78, daily level
Change
2019 and 2026; months compared: May to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Upper Klamath Lake Oregon Reservoir or lake 236.1 2026-09 2026-09 -0.7%
  • 93 monthly values, 2019-01 to 2026-09; 28 flagged low confidence.
  • Change, 2019 and 2026: -1.6 km² (-0.7%).
  • Months compared: January, April to May.
  • Among months not flagged low confidence, the smallest is 228.4 km² (2024-11) and the largest is 241.3 km² (2020-05).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06237.6188.2 to 244.6100%algae_turbid (low confidence)
2026-07236.7120.7 to 243.7100%algae_turbid (low confidence)
2026-08237.0152.2 to 243.8100%algae_turbid (low confidence)
2026-09236.1236.1 to 242.8100%OK

Sample rows from lake_monthly.csv.
State
Oregon, United States
Location
42.40° N, 121.92° W
Gauge record
USGS 11507000, daily level; no gauge-derived area
Change
2019 and 2026; months compared: January, April to May

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Choke Canyon Reservoir Texas Reservoir or lake 29.6 2026-09 2026-09 -61.6%
  • 93 monthly values, 2019-01 to 2026-09; 9 flagged low confidence.
  • Change, 2019 and 2026: -35.7 km² (-61.6%).
  • Months compared: January to April, July.
  • Among months not flagged low confidence, the smallest is 20.0 km² (2026-04) and the largest is 62.3 km² (2019-04).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-0622.321.1 to 24.4100%OK
2026-0722.821.2 to 27.0100%OK
2026-0834.322.0 to 44.9100%methods_disagree (low confidence)
2026-0929.625.5 to 42.5100%methods_disagree (low confidence)

Sample rows from lake_monthly.csv.
State
Texas, United States
Location
28.49° N, 98.33° W
Gauge record
USGS 08206900 level, via Texas Water Development Board
Change
2019 and 2026; months compared: January to April, July

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Lahontan Reservoir Nevada Reservoir or lake 18.9 2026-09 2026-09 -12.5%
  • 93 monthly values, 2019-01 to 2026-09; 9 flagged low confidence.
  • Change, 2019 and 2026: -4.2 km² (-12.5%).
  • Months compared: January, March to September.
  • Among months not flagged low confidence, the smallest is 6.4 km² (2021-10) and the largest is 44.9 km² (2024-05).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-0633.730.9 to 33.7100%OK
2026-0727.024.2 to 27.0100%OK
2026-0822.720.5 to 22.7100%OK
2026-0918.917.0 to 18.9100%OK

Sample rows from lake_monthly.csv.
State
Nevada, United States
Location
39.39° N, 119.13° W
Gauge record
USGS 10312100, daily level
Change
2019 and 2026; months compared: January, March to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
American Falls Reservoir Idaho Reservoir or lake 65.0 2026-09 2026-09 -19.7%
  • 93 monthly values, 2019-01 to 2026-09; 21 flagged low confidence.
  • Change, 2019 and 2026: -33.3 km² (-19.7%).
  • Months compared: April to September.
  • Among months not flagged low confidence, the smallest is 65.0 km² (2026-09) and the largest is 202.3 km² (2024-05).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-06154.4154.4 to 166.3100%OK
2026-07116.4116.4 to 122.5100%OK
2026-0892.692.6 to 98.7100%OK
2026-0965.065.0 to 77.3100%OK

Sample rows from lake_monthly.csv.
State
Idaho, United States
Location
42.93° N, 112.73° W
Gauge record
Bureau of Reclamation Hydromet station AMF, forebay level and storage
Change
2019 and 2026; months compared: April to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account
Lake Corpus Christi Texas Reservoir or lake 64.3 2026-09 2026-09 -47.5%
  • 93 monthly values, 2019-01 to 2026-09; 2 flagged low confidence.
  • Change, 2019 and 2026: -32.9 km² (-47.5%).
  • Months compared: January to September.
  • Among months not flagged low confidence, the smallest is 22.5 km² (2026-03) and the largest is 71.7 km² (2019-01).
MonthWater area (km²)Range (km²)Lake seenQuality
2026-0639.927.7 to 39.9100%OK
2026-0741.826.3 to 41.8100%OK
2026-0865.030.0 to 65.0100%OK
2026-0964.339.0 to 64.3100%OK

Sample rows from lake_monthly.csv.
State
Texas, United States
Location
28.14° N, 97.91° W
Gauge record
USGS 08210500 level, via Texas Water Development Board
Change
2019 and 2026; months compared: January to September

Free: monthly water area since 2019, with an uncertainty range, under CC BY 4.0.

Weekly water area is planned. It is not available yet. Create a free account

Need weekly figures for another lake or reservoir? Weekly figures are planned. Request a lake.

Open datasets

Get a free API key
Dataset What it measures Coverage Period What the data shows Free and paid Access Release Get it
Arctic Open-Water WindowIce and snow · Coasts Open-water days each year at fixed gates in Arctic passages and seas Bering Strait, Northwest Passage, Northern Sea Route and Fram Strait gates 1978-10-26 to 2026-10-01 (1978 and 2026 partial)
  • Bering Strait: open water (under 15% ice) averaged 143.2 days a year in 1979 to 1988 and 196.5 days in 2016 to 2025.
  • Barrow Strait: open water (under 15% ice) averaged 11.1 days a year in 1979 to 1988 and 51.3 days in 2016 to 2025.
  • Vilkitsky Strait: open water (under 15% ice) averaged 5.8 days a year in 1979 to 1988 and 82.6 days in 2016 to 2025.
GateSeasonOpen-water daysFirst openLast open
Bering Strait20251762025-05-312025-11-29
Barrow Strait2025622025-06-302025-10-25
Vilkitsky Strait2025902025-08-012025-10-30

Sample rows from gate_seasons.csv.

Free: Latest day in the live feed: 22 October 2026. The published version 1.1 ends on 1 October 2026. The live feed is newer data from the API. It can change and is not part of the cited version.

 Free Released Published 2026-10-10. Version 1.1, DOI 10.5281/zenodo.23147722. Download on Zenodo · Hugging Face · Kaggle · Dataset page
Storm Blackout and RestorationWeather · Energy Night light by county and night after each storm, and reported customers out and restoration times where utility records exist FEMA-declared U.S. storms: hurricanes, tropical storms, typhoons, winter and severe storms and floods in the states, Puerto Rico, U.S. Virgin Islands and tribal areas 2012-01-14 to 2026-08-11 (672 storms)
  • 672 storms in storms.csv. 611 of them have county rows, with 14,139 declared counties in all.
  • Utility outage records for 10,260 county-storms; a night-light status for every declared county.
StormCountyPeak customers outShare outHours to 90% restored
AL092017Orange, TX30,53571.8%190
AL092017Hardin, TX14,41351.2%179
AL142024Hardee, FL9,57285.8%58
AL142024Manatee, FL220,45584.1%114

Sample rows from utility_by_county.csv.

Free: The published version 1.2 runs through 11 August 2026.

Paid: Storm reports are free with a free account until December 31, 2026. Paid plans start January 1, 2027.

 Free, with paid options Released Published 2026-10-10. Version 1.2, DOI 10.5281/zenodo.23010005. Download on Zenodo · Hugging Face · Kaggle · Dataset page
Western Terminal LakesWater · Deserts Monthly open-water area of 19 western lake and reservoir series, with an uncertainty range Great Salt Lake (both arms), Salton Sea, Mono, Pyramid, Walker, Abert, Mead, Powell, Elephant Butte, Falcon, Flaming Gorge, Amistad, Blue Mesa, Upper Klamath, Choke Canyon, Lahontan, American Falls, Corpus Christi January 2019 to September 2026
  • 19 series on 18 lakes and reservoirs, January 2019 to September 2026.
  • Great Salt Lake, south arm: -277.7 km² (-13.4%), 2019 and 2026.
  • Salton Sea: -75.9 km² (-8.8%), 2019 and 2026.
  • Mono Lake: +0.1 km² (+0.0%), 2019 and 2026.
  • 1,767 lake-months, 1,751 with a value; 296 flagged low confidence.
LakeMonthWater area (km²)Range (km²)Lake seen
great-salt-lake-south2026-081756.11756.1 to 1845.6100%
great-salt-lake-south2026-091734.91734.9 to 1837.3100%
salton-sea2026-08767.1767.1 to 793.9100%
salton-sea2026-09756.6756.6 to 799.8100%

Sample rows from lake_monthly.csv.

Free: Latest gauge reading in the live feed: 24 October 2026. The monthly table in the published version 1.1 covers through September 2026. The live feed is newer data from the API. It can change and is not part of the cited version.

Paid: Weekly lake watch is planned. It is not available yet.

 Free, with paid options Released Published 2026-10-10. Version 1.1, DOI 10.5281/zenodo.23045007. Download on Zenodo · Hugging Face · Kaggle · Dataset page
Rapid Burn Severity, Western WildfiresWildfire · Forests Burn severity for large western fires soon after containment, with uncertainty Large fires in the western U.S. 2019 onward

Free: Each fire, about two weeks after containment

Paid: A report for your sites by arrangement; portfolio monitoring

 Free, with paid options In preparation To be announced
Western Reservoir DigestWater Monthly reservoir storage next to satellite-measured water area Major western U.S. reservoirs To be set

Free: Monthly

 Free In preparation To be announced

Each dataset page has the variables, inputs, method, validation and citation. Where a version DOI is listed, that release is published.

Download and API key

Not in this download, free through the API: full-size radar images of the 15 gates, 2015 to 2026, for the weeks that have a usable one. Get a free key.

Not in this download, free through the API: full-size summer satellite images of all 18 lakes and reservoirs, 2019 to 2026. Get a free key.

Not in this download, free through the API: lights-out videos for most storms, storm-path videos for hurricanes and tropical storms, forecast maps and satellite loops. Get a free key.

Licensed products

Planned, priced by quote. Every value carries its source, the version of that source, and the date it took effect.

Product Price Status What you get
Data-center intelligence By quote In preparation U.S. data-center sites joined to hourly grid demand, generating capacity and planned power plants for each balancing authority (Licensed products are by quote.)
Disaster catalog By quote In preparation U.S. disaster events by county, joined to the storm catalog and to reported utility outages. Open dataset downloads stay free forever. (Licensed products are by quote.)
Federal review milestone feed By quote Planned Milestones, notices and schedule slippage for federal environmental reviews, filtered by region, state, agency or sector (Later product. Quotes on request.)
Portfolio monitoring By quote Planned Your saved boundaries checked against every source update, with a before-and-after for each change (After site screening)
Site screening evidence By quote Planned Every federal record that touches a boundary you supply: wetlands, floodplains, streams, habitat, contaminated sites, air-quality areas, historic places and prior federal reviews, each with its source, version, date and distance (Later product. Quotes on request.)
Water observation histories By quote Planned One reconciled history per lake or reservoir you name: level, surface area, storage and flow, with a quality flag on every value (Planned.)

Samples, delivery formats and licensing terms for each product →

What every release includes

  1. A Digital Object Identifier. A permanent link, like a serial number, that always points to one exact version of the dataset, so citations don't break. on Zenodo

    Arctic Open-Water Window 1.1, Western Terminal Lakes 1.1 and Storm Blackout and Restoration 1.2 each have a DOI on Zenodo. Older versions stay available to cite.

  2. Documented method

    We publish the definitions, a variables table, the measurement conventions behind every value, and where each input came from, so the data can be judged on its merits and reused without guesswork.

  3. A range showing how far the true value could reasonably be from the published number.

    Each table names its sources and their versions. Lake areas carry an uncertainty range. Other tables carry quality flags. If a period has no usable data, we leave it blank rather than fill it in.

  4. Validation

    We check results against independent records and publish that comparison.

  5. Corrections

    When we find an error, we fix it in a new version and note the change in the A running list of what changed in each version and why..

  6. Limits stated

    Each dataset page says what the data is not for and how it compares with existing products.

A release carries everything needed to evaluate, cite, and reuse the data, including example code for working with it. The production systems we use to generate a dataset are not part of a release unless the release says otherwise.

Access and license

Where
Each dataset has a summary here. When a mirror is published, the files are free to download with no form or sign-up. Arctic, Lakes and Storms are on Zenodo, Kaggle and Hugging Face. Published files are hosted on A free research data archive run by CERN. It assigns DOIs and keeps every version., with a copy on A widely used platform for sharing datasets, with a built-in preview of the data..
License
A standard open license, often shortened to CC BY 4.0. Anyone may copy, share, and adapt the data, including commercially, as long as they give credit.. You can reuse the data for any purpose as long as you credit Heimdall Research and cite the version you used.
Sources
Open satellite imagery and government data. We include any attribution the original source requires.
Client data
Licensed data products are described on the licensed data page. Custom datasets are delivered under separate agreements. Ask us about them.
Collaborate
If you work on related research, propose a collaboration.