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, 5:50 PM MDT for Lake County, Montana. It was in force for 25 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, 5:50 PM MDT (23:50 UTC)
- Expired
- Aug 4, 2021, 6:15 PM MDT
- In force
- 25 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.75 in
- Wind
- 50
County Lake County, MT
The radar
The Missoula radar (KMSX), 89 km from the middle of the area, began a volume at 23:52 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, 11.8 hours before the alert went out and 167 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.
619
WWUS85 KMSO 042350
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
550 PM MDT Wed Aug 4 2021
MTZ002-003-050015-
Flathead/Mission Valleys MT-West Glacier Region MT-
550 PM MDT Wed Aug 4 2021
...A strong thunderstorm will impact portions of north central Lake
County through 615 PM MDT...
At 550 PM MDT, Doppler radar was tracking a strong thunderstorm near
Big Arm, or 10 miles north of Polson, moving east at 15 mph.
HAZARD...Wind gusts up to 50 mph and penny 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...
Big Arm, Kings Point, Rollins, Dayton and Finley Point.
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 4778 11430 4789 11431 4795 11399 4776 11394
TIME...MOT...LOC 2350Z 269DEG 12KT 4783 11422
MAX HAIL SIZE...0.75 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 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, 5:55 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.