Alert archive / Montana / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 352
The Storm Prediction Center issued this severe thunderstorm watch at Jul 8, 2021, 5:32 PM MDT for 5 counties in Montana. It was in force for 47 min.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2021, 5:32 PM MDT (23:32 UTC)
- Expired
- Jul 8, 2021, 6:19 PM MDT
- In force
- 47 min
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
Counties Dawson County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Wibaux County, MT
The radar
The Glasgow radar (KGGW), 9 km from the middle of the area, began a volume at 23:32 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 11.5 hours before the alert went out and 7 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
- 102 J/kg
- Mixed-layer CIN
- -411 J/kg
- Mixed-layer LCL
- 1738 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 154 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 1:15 PM MDT | Mesoscale Discussion | SPC | Daniels, Dawson, McCone, Phillips, Prairie, Richland and 2 more | 60 min |
| Jul 8, 2:34 PM MDT | Mesoscale Discussion | SPC | Daniels, Dawson, Fallon, McCone, Richland, Roosevelt and 3 more | 86 min |
Nearby
Severe Thunderstorm Watches in Montana, 2021Every severe thunderstorm watch in 2021
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.