Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Aug 4, 2021, 3:57 PM MDT for Powell County, Montana. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2021, 3:57 PM MDT (21:57 UTC)
- Expired
- Aug 4, 2021, 4:45 PM MDT
- In force
- 48 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.50 in
- Wind
- 30
County Powell County, MT
The radar
The Missoula radar (KMSX), 101 km from the middle of the area, began a volume at 21:58 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, 10.0 hours before the alert went out and 182 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3035 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
857
WWUS85 KMSO 042157
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
357 PM MDT Wed Aug 4 2021
MTZ007-042245-
Butte/Blackfoot Region MT-
357 PM MDT Wed Aug 4 2021
...A strong thunderstorm will impact portions of east central Powell
County through 445 PM MDT...
At 356 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles north of Garrison, or 15 miles east of Drummond, moving
northeast at 30 mph.
HAZARD...Winds in excess of 30 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Finn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4660 11283 4676 11296 4683 11280 4683 11254
4670 11253
TIME...MOT...LOC 2156Z 243DEG 24KT 4670 11283
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 8:55 PM MDT | Special Weather Statement | MSO | 65 min | |
| Aug 4, 1:21 PM MDT | Red Flag Warning | MSO | Beaverhead, Deer Lodge, Flathead, Granite, Jefferson, Lewis and Clark and 7 more | 35 hr |
| Aug 4, 5:30 PM MDT | Special Weather Statement | MSO | Flathead | 30 min |
| Aug 4, 5:35 PM MDT | Special Weather Statement | MSO | Lake | 25 min |
| Aug 4, 5:50 PM MDT | Special Weather Statement | MSO | Lake | 25 min |
| Aug 4, 5:55 PM MDT | Special Weather Statement | MSO | Flathead | 35 min |
Nearby
Special Weather Statements in Montana, 2021Every special weather statement 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.