Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Aug 3, 2021, 8:55 PM MDT. It was in force for 65 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 3, 2021, 8:55 PM MDT (02:55 UTC)
- Expired
- Aug 3, 2021, 10:00 PM MDT
- In force
- 65 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.00 in
- Wind
- 40
The radar
The Pendleton radar (KPDT), 187 km from the middle of the area, began a volume at 02:58 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
Boise Airport, ID (KBOI), launched 00:00Z, 2.9 hours before the alert went out and 208 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
- 819 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 3167 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
946
WWUS85 KMSO 040255
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
755 PM PDT Tue Aug 3 2021
IDZ006-008-040400-
Southern Clearwater Mountains ID-
Lower Hells Canyon/Salmon River Region ID-
755 PM PDT Tue Aug 3 2021
...A strong thunderstorm will impact portions of southwestern Idaho
County through 900 PM PDT...
At 754 PM PDT, Doppler radar was tracking a strong thunderstorm 8
miles south of Imnaha, or 23 miles east of Enterprise, moving east at
20 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Riggins, Pollock, Slate Creek, Riggins Hot Spring and Lucile.
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 4532 11668 4542 11659 4544 11659 4547 11656
4551 11656 4555 11652 4558 11648 4560 11646
4566 11650 4573 11610 4517 11606 4520 11631
4527 11634 4527 11668
TIME...MOT...LOC 0254Z 264DEG 15KT 4544 11680
MAX HAIL SIZE...0.00 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, 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 |
| 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.