Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Riverton, WY

December 26, 2021Sublette County, Wyoming

NWS Riverton, WY issued this special weather statement at Dec 26, 2021, 3:44 PM MST for Sublette County, Wyoming. It was in force for 46 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, 3:44 PM MST (22:44 UTC)
Expired: Dec 26, 2021, 4:30 PM MST
In force: 46 min
Issued by: NWS Riverton, WY

County Sublette County, WY

The radar

The Riverton/Lander radar (KRIW), 100 km from the middle of the area, began a volume at 22:47 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

Riverton, WY (KRIW), launched 12:00Z, 10.7 hours before the alert went out and 106 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1333 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Dec 26, 2:59 PM MST, 45 minutes earlier.

Area forecast discussion, Dec 26, 2:59 PM MST, 45 minutes before

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Hazardous weather outlook, Dec 26, 3:03 PM MST, 41 minutes before

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In the hours before

Local storm report, Dec 26, 11:10 AM MST, 4 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1110 AM MST SUN DEC 26 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1036 AM     NON-TSTM WND GST FARSON                  42.11N 109.45W
12/26/2021  M64 MPH          SWEETWATER         WY   MESONET

            MESONET STATION WY42 FARSON (WYDOT).

&&

Special weather statement, Dec 26, 11:26 AM MST, 4 hours 18 minutes before

Special Weather Statement
National Weather Service Riverton WY
1126 AM MST Sun Dec 26 2021

WYZ008-009-011-014-015-017>020-261930-
Wind River Mountains West-Wind River Basin-Southeast Johnson
County-Bighorn Mountains Southeast-Wind River Mountains East-Green
Mountains and Rattlesnake Range-Bighorn Mountains West-Natrona County
Lower Elevations-Lander Foothills-
1126 AM MST Sun Dec 26 2021

...A SNOW SQUALL WILL AFFECT EASTERN FREMONT...WESTERN
NATRONA AND FAR SOUTHWESTERN JOHNSON COUNTIES...

HAZARDS...A snow squall accompanied by winds of up to 40 MPH which
can rapidly reduce visibility to less than one mile.

At 1125 AM MST, a snow squall was along a line extending from 9
miles south of Hamilton Dome to 10 miles southeast of Oregon Buttes
and moving east at 35 MPH. A second squall line was along US Highway
20/26 between Shoshoni and Natrona, moving northeast at 25 MPH.

LOCATIONS IMPACTED INCLUDE...
Riverton, Lander, Shoshoni, Pavillion, Jeffrey City, Arapahoe,
Hudson, Kinnear, Alcova, Red Canyon, Powder River, Lysite, Moneta,
Hiland, Waltman, Ervay, Lost Cabin, Green Mountain, Goldeneye
Reservoir and Devil's Gate.

SAFETY INFO...
Use extra caution if you must travel into or through this squall.
Rapid changes in visibility and potentially slick roads may lead to
accidents.

&&

LAT...LON 4243 10752 4225 10752 4223 10876 4352 10871
      4343 10853 4342 10820 4346 10817 4341 10816
      4337 10799 4339 10778 4345 10779 4346 10772
      4337 10753 4329 10752 4324 10730 4343 10726
      4348 10760 4358 10759 4361 10665 4243 10669
TIME...MOT...LOC 1825Z 277DEG 31KT 4363 10856 4219 10867

Straub

Local storm report, Dec 26, 11:41 AM MST, 4 hours 3 minutes before

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Special weather statement, Dec 26, 1:51 PM MST, 1 hour 53 minutes before

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Special weather statement, Dec 26, 2:45 PM MST, 59 minutes before

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Special weather statement, Dec 26, 3:44 PM MST, 0 minutes before

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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, 9:31 AM MST	Snow Squall Warning	RIW	Sweetwater	44 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

Nearby

Special Weather Statements in Wyoming, 2021 Every 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.