Alert archive / Idaho / Special Weather Statements in 2021
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Aug 6, 2021, 5:32 PM MDT for Lemhi County, Idaho. It was in force for 43 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 6, 2021, 5:32 PM MDT (23:32 UTC)
- Expired
- Aug 6, 2021, 6:15 PM MDT
- In force
- 43 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.00 in
- Wind
- 40
County Lemhi County, ID
The radar
The Missoula radar (KMSX), 198 km from the middle of the area, began a volume at 23:35 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 12:00Z, 11.5 hours before the alert went out and 270 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
- 40 J/kg
- Mixed-layer CIN
- -373 J/kg
- Mixed-layer LCL
- 2085 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -166 m²/s²
- 0-3 km storm-relative helicity
- -19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
702
WWUS85 KMSO 062332
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
532 PM MDT Fri Aug 6 2021
IDZ010-070015-
Eastern Lemhi County ID-
532 PM MDT Fri Aug 6 2021
...Strong thunderstorms will impact portions of central Lemhi County
through 615 PM MDT...
At 531 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles southeast of Gibbonsville to Salmon.
Movement was south at 10 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...
Salmon, Carmen, Williams Lake and Baker.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms 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 4479 11398 4516 11397 4552 11380 4552 11377
4548 11376 4545 11378 4543 11376 4541 11377
4539 11373 4533 11374 4529 11368 4525 11369
4519 11360 4516 11359 4512 11356
TIME...MOT...LOC 2331Z 356DEG 8KT 4547 11380 4518 11394
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, 8:08 PM MDT | Special Weather Statement | MSO | 52 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 |
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.