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, 5:55 PM MDT for Flathead County, Montana. It was in force for 35 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, 5:55 PM MDT (23:55 UTC)
- Expired
- Aug 4, 2021, 6:30 PM MDT
- In force
- 35 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.50 in
- Wind
- 40
County Flathead County, MT
The radar
The Missoula radar (KMSX), 173 km from the middle of the area, began a volume at 23:57 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 12:00Z, 11.9 hours before the alert went out and 201 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
- 18 J/kg
- Mixed-layer CIN
- -391 J/kg
- Mixed-layer LCL
- 2638 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 259 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
672
WWUS85 KMSO 042355
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
555 PM MDT Wed Aug 4 2021
MTZ002-050030-
West Glacier Region MT-
555 PM MDT Wed Aug 4 2021
...A strong thunderstorm will impact portions of north central
Flathead County through 630 PM MDT...
At 554 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles north of West Glacier, or 27 miles north of Evergreen, moving
east at 20 mph.
HAZARD...Winds in excess of 40 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...
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 4857 11418 4864 11418 4870 11385 4851 11387
TIME...MOT...LOC 2354Z 261DEG 18KT 4860 11404
MAX HAIL SIZE...0.50 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 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, 3:57 PM MDT | Special Weather Statement | MSO | Powell | 48 min |
| 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 |
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.