Flash Flood Warnings in Montana
796 flash flood warnings since 1986. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Flash Flood Warnings
- 796
- Busiest year
- 200170 flash flood warnings
- Average year
- 21over 38 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Valley County65
- Rosebud County58
- Yellowstone County54
- Big Horn County53
- Musselshell County53
- Roosevelt County50
- Garfield County45
- McCone County42
- Custer County40
- Richland County38
- Dawson County38
- Lewis and Clark County37
- Powder River County36
- Golden Valley County31
- Carbon County30
- Stillwater County29
- Treasure County28
- Carter County28
- Phillips County27
- Prairie County24
- Cascade County22
- Ravalli County22
- Sweet Grass County21
- Wheatland County19
- Blaine County18
- Daniels County18
- Chouteau County17
- Teton County16
- Petroleum County15
- Sheridan County14
- Broadwater County14
- Fergus County13
- Judith Basin County13
- Fallon County12
- Wibaux County12
- Hill County11
- Missoula County10
- Meagher County9
- Silver Bow County8
- Granite County8
The latest flash flood warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 7:40 PM MDT | Flash Flood Warning | BYZ | Golden Valley, Sweet Grass | 2 hr |
| Sep 18, 6:02 PM MDT | Flash Flood Warning | BYZ | Golden Valley, Wheatland | 4 hr |
| Sep 6, 10:04 PM MDT | Flash Flood Warning | TFX | Hill, Liberty | 3 hr |
| Sep 6, 9:51 PM MDT | Flash Flood Warning | TFX | Hill, Liberty | 3 hr |
| Aug 14, 8:31 AM MDT | Flash Flood Warning | MSO | Ravalli | 3 hr |
| Jul 30, 5:41 AM MDT | Flash Flood Warning | GGW | Garfield, Valley | 3 hr |
| Jul 22, 7:54 PM MDT | Flash Flood Warning | TFX | Broadwater, Lewis and Clark | 3 hr |
| Jul 17, 9:06 PM MDT | Flash Flood Warning | TFX | Broadwater, Lewis and Clark | 4 hr |
| Jul 17, 5:09 PM MDT | Flash Flood Warning | MSO | Missoula, Powell | 93 min |
| Jul 17, 4:37 PM MDT | Flash Flood Warning | MSO | Granite | 2 hr |
| Jul 17, 4:15 PM MDT | Flash Flood Warning | MSO | Granite | 2 hr |
| Jul 17, 4:14 PM MDT | Flash Flood Warning | MSO | Granite | 2 hr |
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.