National Weather ServiceWyomingFlash Flood WarningArchive to October 1, 2026
Flash Flood Warnings in Wyoming
The National Weather Service issued 10 flash flood warnings for Wyoming in 2025 and 21 a year on average in 2008-2025; in 2021-2025 it had the 44th most of any state. 2026 through September: 20, in line with the average of 21 for those months in 2008-2025. Laramie was covered most often (90 times since 2008).
How many flash flood warnings does Wyoming get?
Every flash flood warning that covered part of Wyoming. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 20 |
| 2025 | 10 |
| 2024 | 11 |
| 2023 | 34 |
| 2022 | 8 |
| 2021 | 15 |
| 2020 | 6 |
| 2019 | 33 |
| 2018 | 36 |
| 2017 | 7 |
| 2016 | 18 |
| 2015 | 45 |
| 2014 | 36 |
| 2013 | 37 |
| 2012 | 10 |
| 2011 | 28 |
| 2010 | 7 |
| 2009 | 17 |
| 2008 | 18 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Wyoming get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Wyoming?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Laramie | 90 | 24 | August 14, 2026 |
| Platte | 58 | 10 | June 25, 2026 |
| Goshen | 53 | 11 | August 14, 2026 |
| Albany | 51 | 14 | August 22, 2026 |
| Johnson | 36 | 4 | June 9, 2024 |
| Natrona | 31 | 4 | June 9, 2024 |
| Sheridan | 23 | 13 | July 30, 2026 |
| Fremont | 18 | 4 | September 20, 2026 |
| Carbon | 17 | 4 | June 20, 2024 |
| Crook | 16 | 2 | May 26, 2023 |
| Weston | 16 | 1 | July 3, 2026 |
| Niobrara | 15 | 3 | July 9, 2023 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
The latest flash flood warnings for Wyoming in AreaZine's record
NWS RivertonWarningSeptember 19, 2026
Flash Flood Warning: Fremont, WY
Expired 9:30 p.m. MDT, September 19, 2026
NWS CheyenneWarningAugust 22, 2026
Flash Flood Warning: Albany, WY
Expired 5:00 p.m. MDT, August 22, 2026
NWS CheyenneWarningAugust 14, 2026
Flash Flood Warning: Laramie, WY
Expired 7:15 p.m. MDT, August 14, 2026
NWS CheyenneWarningAugust 14, 2026
Flash Flood Warning: Banner, Kimball and Laramie, NE and WY
Expired 6:45 p.m. MDT, August 14, 2026
NWS CheyenneWarningAugust 14, 2026
Flash Flood Warning: Banner, Kimball, Goshen and 1 more, NE and WY
Expired 5:15 p.m. MDT, August 14, 2026
NWS CheyenneWarningAugust 13, 2026
Flash Flood Warning: Kimball and Laramie, NE and WY
Expired 11:00 p.m. MDT, August 13, 2026
NWS CheyenneWarningAugust 13, 2026
Flash Flood Warning: Kimball and Laramie, NE and WY
Expired 10:45 p.m. MDT, August 13, 2026
NWS BillingsWarningJuly 29, 2026
Flash Flood Warning: Sheridan, WY
Expired 11:30 p.m. MDT, July 29, 2026
This list is AreaZine's record of the NWS alert feed, kept since April 6, 2026; the counts above come from the complete IEM archive.
Source: National Weather Service alerts (api.weather.gov).
What is a flash flood warning?
A flash flood warning means flash flooding is happening or about to happen: water rising fast in streams, streets or dry washes, usually within six hours of heavy rain or a dam or levee failure. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. The national record · Every warning type in Wyoming.