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, 8:08 PM MDT. It was in force for 52 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, 8:08 PM MDT (02:08 UTC)
- Expired
- Aug 5, 2021, 9:00 PM MDT
- In force
- 52 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.00 in
- Wind
- 40
The radar
The Pendleton radar (KPDT), 197 km from the middle of the area, began a volume at 02:08 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, 2.1 hours before the alert went out and 206 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
- 484 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 3441 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted.
125
WWUS85 KMSO 060208
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
708 PM PDT Thu Aug 5 2021
IDZ006-008-060300-
Southern Clearwater Mountains ID-
Lower Hells Canyon/Salmon River Region ID-
708 PM PDT Thu Aug 5 2021
...A strong thunderstorm will impact portions of southwestern Idaho
County through 800 PM PDT...
At 707 PM PDT, Doppler radar was tracking a strong thunderstorm 9
miles south of Riggins, or 29 miles northwest of McCall, moving
northeast at 20 mph.
HAZARD...Winds in excess of 40 mph. Small hail. Heavy downpours
causing localized excess runoff.
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...
Heavy rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
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 4570 11639 4551 11591 4519 11630 4527 11634
4527 11655 4528 11658
TIME...MOT...LOC 0207Z 211DEG 18KT 4529 11638
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 5, 6:21 PM MDT | Special Weather Statement | MSO | Powell | 39 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.