Alert archive / Wyoming / Special Weather Statements in 2017

Special Weather Statement, NWS Riverton, WY

July 21, 2017

NWS Riverton, WY issued this special weather statement at Jul 21, 2017, 8:13 AM MDT. 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
Jul 21, 2017, 8:13 AM MDT (14:13 UTC)
Expired
Jul 21, 2017, 9:00 AM MDT
In force
47 min
Issued by
NWS Riverton, WY

The radar

The Riverton/Lander radar (KRIW), 102 km from the middle of the area, began a volume at 14:15 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

Riverton, WY (KRIW), launched 12:00Z, 2.2 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-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2017-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 93 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2017-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
93 J/kg
Mixed-layer CIN
-243 J/kg
Mixed-layer LCL
1940 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
84 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 21, 1:41 AM MDT, 6 hours 32 minutes earlier.

Area forecast discussion, Jul 21, 1:41 AM MDT, 6 hours 32 minutes before
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Hazardous weather outlook, Jul 21, 1:44 AM MDT, 6 hours 29 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
144 AM MDT Fri Jul 21 2017

WYZ001>020-022>030-221100-
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-
144 AM MDT Fri Jul 21 2017

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Isolated thunderstorms in Sweetwater County.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Monday...Isolated afternoon and evening thunderstorms.

Tuesday and Wednesday...Isolated to scattered showers and
thunderstorms. Some thunderstorms may produce heavy rain and
localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

In the hours before

Special weather statement, Jul 21, 5:21 AM MDT, 2 hours 52 minutes before
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Special weather statement, Jul 21, 6:30 AM MDT, 1 hour 43 minutes before
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Special weather statement, Jul 21, 8:03 AM MDT, 10 minutes before
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Special weather statement, Jul 21, 8:13 AM MDT, 0 minutes before
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The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 6:47 PM MDTSpecial Weather StatementRIWNatrona43 min
Jul 20, 7:34 PM MDTSpecial Weather StatementRIWNatrona26 min
Jul 20, 8:07 PM MDTSpecial Weather StatementRIW38 min
Jul 20, 9:31 PM MDTSpecial Weather StatementRIWSweetwater29 min
Jul 21, 5:21 AM MDTSpecial Weather StatementRIWSublette39 min
Jul 21, 6:30 AM MDTSpecial Weather StatementRIW30 min
Jul 21, 8:03 AM MDTSpecial Weather StatementRIW42 min
Jul 21, 9:01 AM MDTSpecial Weather StatementRIW29 min
Jul 21, 9:37 AM MDTSpecial Weather StatementRIW38 min
Jul 21, 10:20 AM MDTSpecial Weather StatementRIW40 min
Jul 21, 10:57 AM MDTSpecial Weather StatementRIW48 min
Jul 21, 11:36 AM MDTSpecial Weather StatementRIW24 min
Jul 21, 12:04 PM MDTSpecial Weather StatementRIW56 min
Jul 21, 1:00 PM MDTSpecial Weather StatementRIW30 min
Jul 21, 1:28 PM MDTSpecial Weather StatementRIW47 min
Jul 21, 2:23 PM MDTSpecial Weather StatementRIW52 min
Jul 21, 2:40 PM MDTSevere Thunderstorm WarningRIWSweetwater35 min
Jul 21, 3:02 PM MDTSevere Thunderstorm WarningRIWSweetwater16 min

Nearby

Special Weather Statements in Wyoming, 2017Every special weather statement in 2017

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.