Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Riverton, WY

July 16, 2021Fremont County, Wyoming

NWS Riverton, WY issued this special weather statement at Jul 16, 2021, 5:34 PM MDT for Fremont County, Wyoming. It was in force for 26 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: Jul 16, 2021, 5:34 PM MDT (23:34 UTC)
Expired: Jul 16, 2021, 6:00 PM MDT
In force: 26 min
Issued by: NWS Riverton, WY

County Fremont County, WY

The radar

The Riverton/Lander radar (KRIW), 2 km from the middle of the area, began a volume at 23:34 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, 11.6 hours before the alert went out and 4 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: 11 J/kg
Mixed-layer CIN: -242 J/kg
Mixed-layer LCL: 3206 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 7 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 Jul 16, 5:32 PM MDT, 2 minutes earlier.

Area forecast discussion, Jul 16, 5:32 PM MDT, 2 minutes before

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Hazardous weather outlook, Jul 16, 2:34 AM MDT, 15 hours before

Hazardous Weather Outlook
National Weather Service Riverton WY
234 AM MDT Fri Jul 16 2021

WYZ001>020-022>030-171045-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
234 AM MDT Fri Jul 16 2021

...Red Flag Warning in Effect for portions of western and central
Wyoming...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Critical fire weather for portions of western and central Wyoming.
Please see Red Flag Warning for details.

Isolated to widely scattered afternoon and evening thunderstorms
possible for much of the area.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday through Tuesday...Hot with well above normal
temperatures

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

In the hours before

Special weather statement, Jul 16, 3:47 PM MDT, 1 hour 47 minutes before

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Special weather statement, Jul 16, 3:54 PM MDT, 1 hour 40 minutes before

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Special weather statement, Jul 16, 4:04 PM MDT, 1 hour 30 minutes before

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Special weather statement, Jul 16, 4:52 PM MDT, 42 minutes before

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Special weather statement, Jul 16, 5:02 PM MDT, 32 minutes before

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Special weather statement, Jul 16, 5:34 PM MDT, 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
Jul 16, 2:01 PM MDT	Special Weather Statement	RIW	Hot Springs	29 min
Jul 16, 2:23 PM MDT	Special Weather Statement	RIW	Hot Springs	37 min
Jul 16, 2:57 PM MDT	Special Weather Statement	RIW	Hot Springs	33 min
Jul 16, 3:06 PM MDT	Special Weather Statement	RIW	Washakie	24 min
Jul 16, 3:25 PM MDT	Special Weather Statement	RIW	Big Horn	50 min
Jul 16, 3:47 PM MDT	Special Weather Statement	RIW		28 min
Jul 16, 3:54 PM MDT	Special Weather Statement	RIW	Big Horn	36 min
Jul 16, 4:04 PM MDT	Special Weather Statement	RIW	Fremont	26 min
Jul 16, 4:52 PM MDT	Special Weather Statement	RIW	Johnson	23 min
Jul 16, 5:02 PM MDT	Special Weather Statement	RIW	Fremont	28 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.