Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Aug 5, 2021, 6:21 PM MDT for Powell County, Montana. It was in force for 39 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 5, 2021, 6:21 PM MDT (00:21 UTC)
- Expired
- Aug 5, 2021, 7:00 PM MDT
- In force
- 39 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.50 in
- Wind
- 50
County Powell County, MT
The radar
The Missoula radar (KMSX), 82 km from the middle of the area, began a volume at 00:25 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 00:00Z, 0.4 hours before the alert went out and 186 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
- 49 J/kg
- Mixed-layer CIN
- -233 J/kg
- Mixed-layer LCL
- 3223 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
894
WWUS85 KMSO 060021
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
621 PM MDT Thu Aug 5 2021
MTZ007-043-060100-
Butte/Blackfoot Region MT-Potomac/Seeley Lake Region MT-
621 PM MDT Thu Aug 5 2021
...A strong thunderstorm will impact portions of northeastern Granite
and central Powell Counties through 700 PM MDT...
At 621 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles northeast of Drummond, moving north at 55 mph.
HAZARD...Wind gusts up to 50 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...
Drummond, Ovando, Jens, Helmville and New Chicago.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent 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.
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 4659 11295 4664 11321 4717 11312 4718 11305
4718 11280 4715 11279 4683 11280 4683 11267
TIME...MOT...LOC 0021Z 197DEG 49KT 4674 11301
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 8:08 PM MDT | Special Weather Statement | MSO | 52 min | |
| Aug 5, 9:12 PM MDT | Special Weather Statement | MSO | 48 min | |
| Aug 6, 1:13 AM MDT | Special Weather Statement | MSO | Ravalli | 47 min |
| Aug 6, 2:46 PM MDT | Fire Weather Watch | MSO | Beaverhead, Deer Lodge, Granite, Jefferson, Madison, Powell and 1 more | 22 hr |
| Aug 5, 9:20 PM MDT | Special Weather Statement | MSO | Idaho | 40 min |
| Aug 5, 9:24 PM MDT | Special Weather Statement | MSO | Clearwater | 36 min |
| Aug 5, 9:38 PM MDT | Special Weather Statement | MSO | Idaho | 52 min |
| Aug 6, 5:32 PM MDT | Special Weather Statement | MSO | Lemhi | 43 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.