Alert archive / Montana / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 51, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 3, 2020, 5:49 PM MDT for Gallatin County, Madison County, Montana. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 3, 2020, 5:49 PM MDT (23:49 UTC)
- Expired
- Aug 3, 2020, 6:15 PM MDT
- In force
- 26 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Gallatin County, MT, Madison County, MT
The radar
The Great Falls radar (KTFX), 227 km from the middle of the area, began a volume at 23:51 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 11.8 hours before the alert went out and 238 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 597 J/kg
- Mixed-layer CIN
- -290 J/kg
- Mixed-layer LCL
- 2351 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 3, 5:48 PM MDT, 1 minute earlier.
Area forecast discussion, Aug 3, 5:48 PM MDT, 1 minute before
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Special weather statement, Aug 3, 5:13 PM MDT, 36 minutes before
Special Weather Statement National Weather Service Great Falls MT 513 PM MDT Mon Aug 3 2020 MTZ013-032345- Chouteau- 513 PM MDT Mon Aug 3 2020 ...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL CHOUTEAU COUNTY... At 512 PM MDT, a strong thunderstorm was located 14 miles west of Fort Benton, moving east at 25 mph. Winds in excess of 40 mph and penny size hail are possible with this storm. Locations impacted include... Fort Benton, Carter and Floweree. This includes Highway 87 between mile markers 22 and 42. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4770 11105 4781 11107 4790 11067 4769 11064 TIME...MOT...LOC 2312Z 260DEG 26KT 4777 11095 RCG
Special weather statement, Aug 3, 5:21 PM MDT, 28 minutes before
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</html>Special weather statement, Aug 3, 5:36 PM MDT, 13 minutes before
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</html>The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 8:07 AM MDT | Special Weather Statement | TFX | Teton | 38 min |
| Aug 3, 8:30 AM MDT | Special Weather Statement | TFX | Teton | 30 min |
| Aug 3, 8:50 AM MDT | Special Weather Statement | TFX | Cascade | 40 min |
| Aug 3, 9:26 AM MDT | Special Weather Statement | TFX | Chouteau | 64 min |
| Aug 3, 10:07 AM MDT | Special Weather Statement | TFX | Chouteau | 53 min |
| Aug 3, 10:52 AM MDT | Special Weather Statement | TFX | Chouteau | 53 min |
| Aug 3, 10:59 AM MDT | Special Weather Statement | TFX | Chouteau | 46 min |
| Aug 3, 11:48 AM MDT | Special Weather Statement | TFX | Chouteau | 57 min |
| Aug 3, 12:19 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 41 min |
| Aug 3, 12:32 PM MDT | Special Weather Statement | TFX | Blaine | 43 min |
| Aug 3, 1:02 PM MDT | Special Weather Statement | TFX | Fergus | 43 min |
| Aug 3, 1:40 PM MDT | Special Weather Statement | TFX | Fergus | 65 min |
| Aug 3, 2:16 PM MDT | Special Weather Statement | TFX | Blaine | 44 min |
| Aug 3, 2:27 PM MDT | Special Weather Statement | TFX | Fergus | 48 min |
| Aug 3, 2:36 PM MDT | Special Weather Statement | TFX | 24 min | |
| Aug 3, 3:23 PM MDT | Special Weather Statement | TFX | 22 min | |
| Aug 3, 3:40 PM MDT | Special Weather Statement | TFX | Madison | 35 min |
| Aug 3, 4:27 PM MDT | Special Weather Statement | TFX | Madison | 48 min |
| Aug 3, 4:41 PM MDT | Special Weather Statement | TFX | Chouteau | 34 min |
| Aug 3, 4:51 PM MDT | Special Weather Statement | TFX | Judith Basin | 24 min |
| Aug 3, 5:03 PM MDT | Special Weather Statement | TFX | Teton | 27 min |
| Aug 3, 5:13 PM MDT | Special Weather Statement | TFX | Chouteau | 32 min |
| Aug 3, 5:21 PM MDT | Special Weather Statement | TFX | 39 min | |
| Aug 3, 5:28 PM MDT | Special Weather Statement | TFX | Gallatin, Madison | 47 min |
| Aug 3, 5:34 PM MDT | Special Weather Statement | TFX | Liberty | 26 min |
| Aug 3, 5:36 PM MDT | Special Weather Statement | TFX | Fergus | 24 min |
| Aug 3, 5:46 PM MDT | Special Weather Statement | TFX | Chouteau | 29 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2020Every severe thunderstorm warning in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.