Alert archive / Montana / 2021
Weather alerts in Montana, May 2021
85 weather alerts in May 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in May 2021. Tap one for its archive.
- Alerts
- 85
- Warnings
- 11
- Watches
- 5
- Advisories
- 18
- Busiest day
- May 28, 202111 alerts
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 3:14 AM MDT | Red Flag Warning | GGW | Daniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more | 17 hr |
| May 1, 2:13 PM MDT | Lake Wind Advisory | GGW | Garfield, McCone, Petroleum, Phillips, Valley | 31 hr |
| May 1, 6:53 PM MDT | Special Weather Statement | TFX | 22 min | |
| May 1, 9:01 PM MDT | Special Weather Statement | BYZ | Yellowstone | 59 min |
| May 5, 11:44 AM MDT | Special Weather Statement | BYZ | Rosebud | 16 min |
| May 6, 1:35 PM MDT | Fire Weather Watch | GGW | Daniels, Roosevelt, Sheridan, Valley | 14 hr |
| May 6, 1:36 PM MDT | Lake Wind Advisory | GGW | Garfield, McCone, Petroleum, Phillips, Valley | 61 hr |
| May 7, 3:05 AM MDT | Red Flag Warning | GGW | Daniels, Dawson, McCone, Prairie, Richland, Roosevelt and 3 more | 17 hr |
| May 7, 11:19 AM MDT | Flash Flood Watch | TFX | 8 hr | |
| May 7, 1:44 PM MDT | Winter Weather Advisory | GGW | Daniels, Phillips, Richland, Roosevelt, Sheridan, Valley | 40 hr |
| May 7, 2:25 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Gallatin, Golden Valley, Jefferson, Madison and 5 more | 2 hr |
| May 7, 2:32 PM MDT | Special Weather Statement | TFX | Beaverhead, Gallatin, Jefferson, Madison | 88 min |
| May 7, 2:35 PM MDT | Winter Weather Advisory | TFX | 45 hr | |
| May 7, 4:21 PM MDT | Special Weather Statement | TFX | Gallatin | 24 min |
| May 7, 4:30 PM MDT | Special Weather Statement | BYZ | Park | 45 min |
| May 7, 5:09 PM MDT | Special Weather Statement | BYZ | Wheatland | 51 min |
| May 7, 7:06 PM MDT | Special Weather Statement | BYZ | Rosebud | 24 min |
| May 7, 8:52 PM MDT | Special Weather Statement | BYZ | Treasure | 23 min |
| May 7, 9:31 PM MDT | Special Weather Statement | GGW | Garfield | 44 min |
| May 13, 6:57 PM MDT | Special Weather Statement | TFX | Liberty | 33 min |
| May 13, 7:39 PM MDT | Special Weather Statement | TFX | Hill | 36 min |
| May 14, 1:23 PM MDT | Special Weather Statement | BYZ | Musselshell | 37 min |
| May 14, 3:37 PM MDT | Special Weather Statement | TFX | Broadwater | 38 min |
| May 14, 4:15 PM MDT | Special Weather Statement | TFX | Broadwater | 30 min |
| May 14, 5:30 PM MDT | Special Weather Statement | TFX | Meagher | 30 min |
| May 16, 5:52 AM MDT | Special Weather Statement | BYZ | Carter | 113 min |
| May 16, 1:52 PM MDT | Fire Weather Watch | GGW | Daniels, Roosevelt, Sheridan, Valley | 14 hr |
| May 17, 1:55 AM MDT | Winter Storm Watch | TFX | 37 hr | |
| May 17, 3:35 AM MDT | Red Flag Warning | GGW | Daniels, Phillips, Roosevelt, Sheridan, Valley | 17 hr |
| May 17, 2:36 PM MDT | Lake Wind Advisory | MSO | Flathead, Lake, Sanders | 30 hr |
| May 17, 2:40 PM MDT | Winter Storm Watch | MSO | Flathead, Lake | 24 hr |
| May 18, 3:08 AM MDT | Lake Wind Advisory | GGW | Garfield, McCone, Petroleum, Phillips, Valley | 24 hr |
| May 18, 10:04 AM MDT | High Wind Warning | TFX | 10 hr | |
| May 18, 2:36 PM MDT | Winter Storm Warning | TFX | 66 hr | |
| May 18, 2:36 PM MDT | Winter Weather Advisory | TFX | 66 hr | |
| May 18, 2:37 PM MDT | Winter Weather Advisory | MSO | Deer Lodge, Flathead, Granite, Lake, Mineral, Missoula and 4 more | 67 hr |
| May 18, 3:41 PM MDT | Special Weather Statement | GGW | Valley | 64 min |
| May 18, 5:06 PM MDT | Special Weather Statement | GGW | McCone | 54 min |
| May 18, 5:08 PM MDT | Special Weather Statement | GGW | Daniels | 52 min |
| May 18, 6:02 PM MDT | Special Weather Statement | GGW | Roosevelt | 58 min |
| May 19, 2:25 PM MDT | Lake Wind Advisory | GGW | Garfield, McCone, Petroleum, Phillips, Valley | 36 hr |
| May 20, 6:35 AM MDT | Special Weather Statement | TFX | Madison | 40 min |
| May 20, 12:58 PM MDT | Mesoscale Discussion | SPC | Carter, Powder River | 3 hr |
| May 20, 3:52 PM MDT | Special Weather Statement | BYZ | Powder River | 23 min |
| May 20, 4:24 PM MDT | Special Weather Statement | BYZ | Powder River | 36 min |
| May 20, 5:47 PM MDT | Special Weather Statement | BYZ | Carter | 43 min |
| May 20, 6:11 PM MDT | Special Weather Statement | GGW | Dawson | 49 min |
| May 20, 6:29 PM MDT | Special Weather Statement | TFX | Cascade, Lewis and Clark, Pondera, Teton, Toole | 31 min |
| May 20, 6:31 PM MDT | Special Weather Statement | BYZ | Carter | 44 min |
| May 20, 6:47 PM MDT | Special Weather Statement | TFX | Chouteau, Hill, Liberty | 28 min |
| May 21, 2:52 AM MDT | Winter Weather Advisory | BYZ | Golden Valley, Park, Wheatland | 6 hr |
| May 21, 7:36 PM MDT | Special Weather Statement | TFX | Judith Basin | 24 min |
| May 21, 8:31 PM MDT | Winter Weather Advisory | MSO | Deer Lodge, Granite, Powell, Silver Bow | 3 hr |
| May 22, 2:13 PM MDT | Lake Wind Advisory | GGW | Garfield, McCone, Petroleum, Phillips, Valley | 31 hr |
| May 22, 2:13 PM MDT | Winter Weather Advisory | MSO | Deer Lodge, Flathead, Granite, Lake, Missoula, Powell and 2 more | 22 hr |
| May 22, 8:42 PM MDT | Winter Weather Advisory | TFX | 39 hr | |
| May 23, 10:42 AM MDT | Special Weather Statement | BYZ | Big Horn | 2 hr |
| May 23, 2:02 PM MDT | Winter Weather Advisory | MSO | Flathead, Lake | 17 hr |
| May 23, 2:14 PM MDT | Lake Wind Advisory | GGW | Garfield, McCone, Petroleum, Phillips, Valley | 52 hr |
| May 23, 7:51 PM MDT | Special Weather Statement | BYZ | Rosebud | 24 min |
| May 25, 10:56 AM MDT | River Flood Warning | MSO | Missoula | 4 days |
| May 25, 3:35 PM MDT | Special Weather Statement | TFX | Beaverhead, Madison | 40 min |
| May 25, 5:19 PM MDT | Special Weather Statement | TFX | Beaverhead | 41 min |
| May 26, 9:09 AM MDT | River Flood Advisory | TFX | Lewis and Clark | 25 hr |
| May 27, 7:30 PM MDT | High Wind Warning | TFX | 23 hr | |
| May 28, 2:12 PM MDT | River Flood Advisory | MSO | Missoula | 10 days |
| May 28, 3:55 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Carter, Custer, Fallon, Powder River and 4 more | 2 hr |
| May 28, 3:59 PM MDT | Special Weather Statement | BYZ | Carbon | 31 min |
| May 28, 4:11 PM MDT | Special Weather Statement | BYZ | Yellowstone | 34 min |
| May 28, 4:33 PM MDT | Special Weather Statement | BYZ | 27 min | |
| May 28, 4:46 PM MDT | Special Weather Statement | BYZ | Treasure | 29 min |
| May 28, 4:51 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 24 min |
| May 28, 5:12 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 48 min |
| May 28, 5:14 PM MDT | Special Weather Statement | BYZ | Treasure | 31 min |
| May 28, 5:59 PM MDT | Special Weather Statement | BYZ | Big Horn | 31 min |
| May 28, 6:06 PM MDT | Special Weather Statement | BYZ | 24 min | |
| May 28, 6:21 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 24 min |
| May 28, 6:29 PM MDT | Special Weather Statement | BYZ | Big Horn | 46 min |
| May 28, 6:50 PM MDT | Special Weather Statement | BYZ | Custer, Powder River | 40 min |
| May 28, 7:30 PM MDT | Special Weather Statement | BYZ | Powder River | 45 min |
| May 28, 7:48 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 27 min |
| May 28, 8:26 PM MDT | Special Weather Statement | BYZ | Powder River | 34 min |
| May 28, 9:09 PM MDT | Special Weather Statement | BYZ | Carter | 36 min |
| May 29, 3:45 PM MDT | Special Weather Statement | GGW | McCone | 45 min |
| May 29, 5:24 PM MDT | Special Weather Statement | GGW | Sheridan | 51 min |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 4 |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 48 |
| Flooding | |
| River Flood Warning | 1 |
| Flash Flood Watch | 1 |
| River Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 9 |
| Wind and dust | |
| High Wind Warning | 2 |
| Lake Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 2 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Valley County13
- McCone County10
- Phillips County9
- Garfield County8
- Powder River County8
- Daniels County7
- Petroleum County7
- Roosevelt County7
- Sheridan County7
- Carter County6
- Big Horn County6
- Rosebud County5
- Flathead County5
- Lake County5
- Beaverhead County4
- Madison County4
- Treasure County4
- Missoula County4
- Dawson County3
- Richland County3
- Yellowstone County3
- Broadwater County3
- Gallatin County3
- Park County3
- Wheatland County3
- Deer Lodge County3
- Granite County3
- Powell County3
- Silver Bow County3
- Prairie County2
- Wibaux County2
- Golden Valley County2
- Jefferson County2
- Meagher County2
- Stillwater County2
- Liberty County2
- Hill County2
- Sanders County2
- Ravalli County2
- Lewis and Clark County2
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.