Alert archive / Idaho / Special Weather Statements in 2021
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Aug 5, 2021, 8:38 PM PDT for Idaho County, Idaho. 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, 8:38 PM PDT (03:38 UTC)
- Expired
- Aug 5, 2021, 9:30 PM PDT
- In force
- 52 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.25 in
- Wind
- 40
County Idaho County, ID
The radar
The Missoula radar (KMSX), 188 km from the middle of the area, began a volume at 03:38 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, 3.6 hours before the alert went out and 227 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2910 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
171
WWUS85 KMSO 060338
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
838 PM PDT Thu Aug 5 2021
IDZ006-060430-
Southern Clearwater Mountains ID-
838 PM PDT Thu Aug 5 2021
...A strong thunderstorm will impact portions of central Idaho County
through 930 PM PDT...
At 837 PM PDT, Doppler radar was tracking a strong thunderstorm 24
miles southeast of Grangeville, moving northeast at 20 mph.
HAZARD...Winds in excess of 40 mph and pea 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...
Orogrande, Elk City, Fall Creek and Golden.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4556 11563 4569 11591 4591 11567 4579 11551
4589 11540 4580 11521
TIME...MOT...LOC 0337Z 220DEG 19KT 4567 11576
MAX HAIL SIZE...0.25 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, 5:21 PM PDT | Special Weather Statement | MSO | Powell | 39 min |
| Aug 5, 7:08 PM PDT | Special Weather Statement | MSO | 52 min | |
| Aug 5, 8:12 PM PDT | Special Weather Statement | MSO | 48 min | |
| Aug 6, 12:13 AM PDT | Special Weather Statement | MSO | Ravalli | 47 min |
| Aug 6, 1:46 PM PDT | Fire Weather Watch | MSO | Beaverhead, Deer Lodge, Granite, Jefferson, Madison, Powell and 1 more | 22 hr |
| Aug 5, 8:20 PM PDT | Special Weather Statement | MSO | Idaho | 40 min |
| Aug 5, 8:24 PM PDT | Special Weather Statement | MSO | Clearwater | 36 min |
| Aug 6, 4:32 PM PDT | Special Weather Statement | MSO | Lemhi | 43 min |
Nearby
Special Weather Statements in Idaho, 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.