Alert archive / Wyoming / Snow Squall Warnings in 2021
Snow Squall Warning 2, NWS Riverton, WY
NWS Riverton, WY issued this snow squall warning at Dec 26, 2021, 9:31 AM MST for Sweetwater County, Wyoming. It was in force for 44 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
- Dec 26, 2021, 9:31 AM MST (16:31 UTC)
- Expired
- Dec 26, 2021, 10:15 AM MST
- In force
- 44 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
County Sweetwater County, WY
The radar
The Riverton/Lander radar (KRIW), 201 km from the middle of the area, began a volume at 16:32 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
Salt Lake City I, UT (KSLC), launched 12:00Z, 4.5 hours before the alert went out and 202 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
- 1198 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 356 m²/s²
- 0-3 km storm-relative helicity
- 385 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
974
WWUS55 KRIW 261631
SQWRIW
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Riverton WY
931 AM MST Sun Dec 26 2021
WYC037-261715-
/O.NEW.KRIW.SQ.W.0002.211226T1631Z-211226T1715Z/
Sweetwater-
931 AM MST Sun Dec 26 2021
The National Weather Service in Riverton has issued a
* Snow Squall Warning for...
Southwestern Sweetwater County in south central Wyoming...
* Until 1015 AM MST.
* At 930 AM MST, a dangerous snow squall was located 13 miles east of
Lyman, or 14 miles south of Granger, moving east at 45 mph.
HAZARD...Heavy snow and blowing snow. Wind gusts greater than 40
mph. Frequent gusts of 40 to 50 mph have been reported
along I-80 in Uinta County in the past hour.
SOURCE...Radar and webcams.
IMPACT...Dangerous life-threatening travel.
* This includes Interstate 80 between mile markers 58 and 108.
Locations impacted include...
Rock Springs, Green River, Granger, Little America, and Flaming
Gorge National Recreation Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
&&
LAT...LON 4168 11004 4180 10924 4121 10905 4109 11005
TIME...MOT...LOC 1630Z 262DEG 41KT 4139 11006
$$
Straub1 follow-up statement
869 WWUS55 KRIW 261654 SQWRIW Snow Squall Warning National Weather Service Riverton WY 954 AM MST Sun Dec 26 2021 WYC037-261715- /O.CON.KRIW.SQ.W.0002.000000T0000Z-211226T1715Z/ Sweetwater- 954 AM MST Sun Dec 26 2021 ...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 1015 AM MST FOR SOUTHWESTERN SWEETWATER COUNTY... At 953 AM MST, a dangerous snow squall was located along a line extending from 13 miles northwest of Rock Springs to 9 miles northeast of Lonetree, moving east at 45 mph. HAZARD...Heavy snow and blowing snow. Wind gusts greater than 40 mph. SOURCE...Radar and webcams. IMPACT...Dangerous life-threatening travel. This includes Interstate 80 between mile markers 58 and 108. Locations impacted include... Rock Springs, Green River, Granger, Little America, and Flaming Gorge National Recreation Area. PRECAUTIONARY/PREPAREDNESS ACTIONS... Consider avoiding or delaying travel until the snow squall passes your location. If you must travel, use extra caution and allow extra time. Rapid changes in visibility and slick road conditions may lead to accidents. && LAT...LON 4168 11004 4180 10924 4121 10905 4109 11005 TIME...MOT...LOC 1653Z 260DEG 46KT 4178 10935 4112 11000 $$ Straub
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 26, 7:43 AM MST | Special Weather Statement | RIW | Teton | 62 min |
| Dec 26, 8:35 AM MST | Special Weather Statement | RIW | Lincoln, Park, Sublette | 55 min |
| Dec 26, 9:37 AM MST | Special Weather Statement | RIW | Fremont, Hot Springs | 53 min |
| Dec 26, 10:12 AM MST | Snow Squall Warning | RIW | Sweetwater | 48 min |
| Dec 26, 10:28 AM MST | Special Weather Statement | RIW | Big Horn, Fremont, Hot Springs | 62 min |
| Dec 26, 11:00 AM MST | Snow Squall Warning | RIW | Sweetwater | 45 min |
| Dec 26, 11:26 AM MST | Special Weather Statement | RIW | Fremont, Natrona | 64 min |
| Dec 26, 11:38 AM MST | Snow Squall Warning | RIW | Sweetwater | 52 min |
| Dec 26, 1:51 PM MST | Special Weather Statement | RIW | Lincoln | 54 min |
| Dec 26, 2:45 PM MST | Special Weather Statement | RIW | Lincoln, Sublette, Teton | 60 min |
| Dec 26, 3:44 PM MST | Special Weather Statement | RIW | Sublette | 46 min |
Nearby
Snow Squall Warnings in Wyoming, 2021Every snow squall warning 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.