Alert archive / Montana / Severe Thunderstorm Warnings / 2020
Severe Thunderstorm Warnings in Montana, May 2020
39 severe thunderstorm warnings in May 2020. 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 severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in May 2020. Tap one for its archive.
- Severe Thunderstorm Warnings
- 39
- Busiest day
- May 20, 202013 severe thunderstorm warnings
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 3, 4:32 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 58 min |
| May 3, 5:26 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 64 min |
| May 3, 6:04 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 22 min |
| May 3, 6:28 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 62 min |
| May 18, 6:50 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 25 min |
| May 18, 7:12 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 33 min |
| May 18, 7:37 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Teton | 23 min |
| May 18, 7:53 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Teton | 26 min |
| May 18, 11:44 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Fergus, Judith Basin | 46 min |
| May 19, 4:39 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin | 36 min |
| May 19, 5:15 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 30 min |
| May 19, 7:24 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 66 min |
| May 19, 8:01 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley | 59 min |
| May 19, 8:19 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 26 min |
| May 19, 8:47 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 28 min |
| May 19, 8:55 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 35 min |
| May 19, 8:59 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 61 min |
| May 19, 9:25 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 35 min |
| May 20, 12:55 AM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 50 min |
| May 20, 2:00 AM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Pondera, Teton | 45 min |
| May 20, 2:26 AM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 49 min |
| May 20, 4:21 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 24 min |
| May 20, 4:42 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 48 min |
| May 20, 5:23 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 67 min |
| May 20, 6:23 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 52 min |
| May 20, 6:54 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 36 min |
| May 20, 6:55 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 30 min |
| May 20, 7:24 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Fallon, Rosebud | 48 min |
| May 20, 7:28 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Prairie | 62 min |
| May 20, 7:35 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, Petroleum, Phillips | 55 min |
| May 20, 8:18 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone, Prairie, Valley | 57 min |
| May 20, 8:36 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Richland, Roosevelt, Wibaux | 39 min |
| May 20, 8:44 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Phillips, Richland, Roosevelt and 1 more | 76 min |
| May 20, 9:33 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Phillips, Roosevelt, Valley | 57 min |
| May 20, 9:35 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan | 55 min |
| May 31, 8:14 AM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake, Lincoln | 31 min |
| May 31, 8:41 AM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lincoln | 34 min |
| May 31, 5:10 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 65 min |
| May 31, 5:23 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 53 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Custer County7
- Cascade County5
- Fergus County5
- Prairie County4
- Garfield County4
- McCone County4
- Roosevelt County4
- Carter County3
- Lewis and Clark County3
- Teton County3
- Judith Basin County3
- Dawson County3
- Phillips County3
- Valley County3
- Wibaux County2
- Chouteau County2
- Golden Valley County2
- Musselshell County2
- Petroleum County2
- Rosebud County2
- Richland County2
- Daniels County2
- Flathead County2
- Lincoln County2
- Wheatland County1
- Pondera County1
- Fallon County1
- Sheridan County1
- Lake County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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. Warning verification from the Mesonet's Cow. Rebuilt daily.