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, 8:20 PM PDT for Idaho County, Idaho. It was in force for 40 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, 8:20 PM PDT (03:20 UTC)
- Expired
- Aug 5, 2021, 9:00 PM PDT
- In force
- 40 min
- Issued by
- NWS Missoula, MT
- Hail
- 0.00 in
- Wind
- 40
County Idaho County, ID
The radar
The Missoula radar (KMSX), 172 km from the middle of the area, began a volume at 03:23 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, 3.3 hours before the alert went out and 178 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 060320
SPSMSO
Special Weather Statement
National Weather Service Missoula MT
820 PM PDT Thu Aug 5 2021
IDZ005>007-060400-
Southern Clearwater Mountains ID-Northern Clearwater Mountains ID-
Orofino/Grangeville Region ID-
820 PM PDT Thu Aug 5 2021
...Strong thunderstorms will impact portions of north central Idaho
and south central Clearwater Counties through 900 PM PDT...
At 818 PM PDT, Doppler radar was tracking strong thunderstorms along
a line extending from near East Kamiah to near Lowell to 25 miles
southeast of Kooskia. Movement was north at 40 mph. These storms
have history of producing gusty outflow winds of 40-50 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...
Kooskia, Weippe, Lowell, East Kamiah, Stites, Musselshell, Winona,
Newsome, Glenwood and Syringa.
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 4621 11610 4621 11606 4623 11601 4625 11606
4644 11588 4640 11544 4614 11526 4593 11536
4579 11551 4596 11572 4608 11603 4611 11620
TIME...MOT...LOC 0318Z 195DEG 33KT 4619 11595 4612 11566 4596 11550
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, 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, 8:24 PM PDT | Special Weather Statement | MSO | Clearwater | 36 min |
| Aug 5, 8:38 PM PDT | Special Weather Statement | MSO | Idaho | 52 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.