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, 6:21 PM MDT for Flathead County, Montana. It was in force for 24 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, 6:21 PM MDT (00:21 UTC)
- Expired
- Aug 4, 2021, 6:45 PM MDT
- In force
- 24 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.88 in
- Wind
- 40
County Flathead County, MT
The radar
The Missoula radar (KMSX), 178 km from the middle of the area, began a volume at 00:22 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
Spokane, WA (KOTX), launched 00:00Z, 0.4 hours before the alert went out and 221 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
- 502 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 3045 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
935
WWUS85 KMSO 050021
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
621 PM MDT Wed Aug 4 2021
MTZ002-050045-
West Glacier Region MT-
621 PM MDT Wed Aug 4 2021
...A strong thunderstorm will impact portions of northeastern
Flathead County through 645 PM MDT...
At 621 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles northeast of West Glacier, or 33 miles northeast of Evergreen,
moving east at 25 mph.
HAZARD...Winds in excess of 40 mph and nickel size 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...
Lake McDonald.
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 4869 11374 4867 11373 4865 11375 4862 11375
4860 11372 4859 11371 4859 11392 4864 11393
TIME...MOT...LOC 0021Z 258DEG 20KT 4862 11384
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 6:31 PM MDT | Special Weather Statement | MSO | Lake | 14 min |
| Aug 4, 7:57 PM MDT | Special Weather Statement | MSO | Lake | 18 min |
| Aug 4, 8:03 PM MDT | Severe Thunderstorm Warning | MSO | Lake | 27 min |
| Aug 4, 8:26 PM MDT | Severe Thunderstorm Warning | MSO | Lake | 34 min |
| Aug 5, 2:27 PM MDT | Special Weather Statement | MSO | Mineral, Ravalli | 33 min |
| Aug 5, 3:20 PM MDT | Special Weather Statement | MSO | Granite, Ravalli | 55 min |
| Aug 5, 4:12 PM MDT | Special Weather Statement | MSO | Deer Lodge, Silver Bow | 48 min |
| Aug 5, 4:19 PM MDT | Special Weather Statement | MSO | Ravalli | 56 min |
| Aug 5, 5:03 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 42 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.