Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Aug 6, 2021, 1:13 AM MDT for Ravalli County, Montana. It was in force for 47 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, 1:13 AM MDT (07:13 UTC)
- Expired
- Aug 6, 2021, 2:00 AM MDT
- In force
- 47 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.25 in
- Wind
- 30
County Ravalli County, MT
The radar
The Missoula radar (KMSX), 151 km from the middle of the area, began a volume at 07:15 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, 7.2 hours before the alert went out and 294 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.
621
WWUS85 KMSO 060713
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
113 AM MDT Fri Aug 6 2021
IDZ009-010-MTZ005-006-060800-
Eastern Lemhi County ID-Western Lemhi County ID-
Bitterroot/Sapphire Mountains MT-Missoula/Bitterroot Valleys MT-
113 AM MDT Fri Aug 6 2021
...A strong thunderstorm will impact portions of northern Lemhi and
southeastern Ravalli Counties through 200 AM MDT...
At 112 AM MDT, Doppler radar was tracking a strong thunderstorm near
Gibbonsville, or 32 miles north of Salmon, moving north at 25 mph.
HAZARD...Winds in excess of 30 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...
Gibbonsville, Sula and Lost Trail Pass.
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.
&&
LAT...LON 4575 11382 4575 11385 4578 11387 4575 11391
4570 11391 4570 11394 4567 11393 4565 11390
4563 11390 4562 11389 4562 11385 4560 11382
4546 11388 4550 11413 4590 11409 4584 11371
TIME...MOT...LOC 0712Z 195DEG 22KT 4564 11397
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 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, 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.