Alert archive / Wyoming / Special Weather Statements in 2018

Special Weather Statement, NWS Riverton, WY

August 5, 2018

NWS Riverton, WY issued this special weather statement at Aug 5, 2018, 3:40 PM MDT. It was in force for 35 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, 2018, 3:40 PM MDT (21:40 UTC)
Expired
Aug 5, 2018, 4:15 PM MDT
In force
35 min
Issued by
NWS Riverton, WY

The radar

The Riverton/Lander radar (KRIW), 85 km from the middle of the area, began a volume at 21:43 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, 9.7 hours before the alert went out and 89 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 2018-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2018-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2495 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
93 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 Aug 5, 1:37 PM MDT, 2 hours 3 minutes earlier.

Area forecast discussion, Aug 5, 1:37 PM MDT, 2 hours 3 minutes before
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Hazardous weather outlook, Aug 5, 2:08 AM MDT, 13 hours 32 minutes before
Hazardous Weather Outlook...CORRECTED
National Weather Service Riverton WY
208 AM MDT Sun Aug 5 2018

WYZ001>020-022>030-061115-
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-
208 AM MDT Sun Aug 5 2018

...Red Flag Warning in effect for Sweetwater, Uinta and southern
Lincoln counties from 12pm to 9pm today...

This Hazardous Weather Outlook is for Western and Central
Wyoming.

.DAY ONE...Today and Tonight.

Warm temperatures with gusty west winds will bring critical fire
weather conditions across southern and southwestern Wyoming during
the afternoon and early evening. Isolated to scattered afternoon
and evening thunderstorms across northern and central Wyoming.
Some thunderstorms in Southeast Natrona County, including the city
of Casper, could become severe with large hail and damaging
winds.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
wind gusts of 45 mph or greater as well as hail size. Thank you.

TEAM RIVERTON

In the hours before

Special weather statement, Aug 5, 12:49 PM MDT, 2 hours 51 minutes before
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Special weather statement, Aug 5, 1:19 PM MDT, 2 hours 21 minutes before
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Special weather statement, Aug 5, 2:12 PM MDT, 1 hour 28 minutes before
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Special weather statement, Aug 5, 2:44 PM MDT, 56 minutes before
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Special weather statement, Aug 5, 3:37 PM MDT, 3 minutes before
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Special weather statement, Aug 5, 3:40 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 7:22 PM MDTSpecial Weather StatementRIWSweetwater53 min
Aug 5, 7:52 AM MDTSpecial Weather StatementRIWSweetwater38 min
Aug 5, 8:31 AM MDTSpecial Weather StatementRIWSweetwater44 min
Aug 5, 9:15 AM MDTSpecial Weather StatementRIW45 min
Aug 5, 9:50 AM MDTSpecial Weather StatementRIW40 min
Aug 5, 10:31 AM MDTSpecial Weather StatementRIW44 min
Aug 5, 10:40 AM MDTSpecial Weather StatementRIWTeton35 min
Aug 5, 11:15 AM MDTSpecial Weather StatementRIWTeton30 min
Aug 5, 11:17 AM MDTSpecial Weather StatementRIW28 min
Aug 5, 11:42 AM MDTSpecial Weather StatementRIW33 min
Aug 5, 11:44 AM MDTSpecial Weather StatementRIWTeton31 min
Aug 5, 11:49 AM MDTSpecial Weather StatementRIWBig Horn26 min
Aug 5, 12:11 PM MDTSpecial Weather StatementRIWPark34 min
Aug 5, 12:16 PM MDTSpecial Weather StatementRIWBig Horn29 min
Aug 5, 12:30 PM MDTSpecial Weather StatementRIWPark30 min
Aug 5, 12:47 PM MDTSpecial Weather StatementRIWPark28 min
Aug 5, 12:49 PM MDTSpecial Weather StatementRIWBig Horn26 min
Aug 5, 1:19 PM MDTSpecial Weather StatementRIWPark26 min
Aug 5, 2:12 PM MDTSpecial Weather StatementRIW48 min
Aug 5, 2:44 PM MDTSpecial Weather StatementRIWSublette31 min
Aug 5, 3:37 PM MDTSpecial Weather StatementRIWFremont23 min
Aug 5, 3:57 PM MDTSpecial Weather StatementRIWFremont33 min
Aug 5, 4:08 PM MDTSpecial Weather StatementRIWNatrona52 min
Aug 5, 4:13 PM MDTSpecial Weather StatementRIW62 min
Aug 5, 4:21 PM MDTSpecial Weather StatementRIW24 min
Aug 5, 4:22 PM MDTSpecial Weather StatementRIW38 min
Aug 5, 4:35 PM MDTSpecial Weather StatementRIWNatrona40 min
Aug 5, 4:41 PM MDTSpecial Weather StatementRIW34 min
Aug 5, 4:50 PM MDTSevere Thunderstorm WarningRIWSweetwater40 min
Aug 5, 5:10 PM MDTSpecial Weather StatementRIWTeton50 min
Aug 5, 5:23 PM MDTSpecial Weather StatementRIWNatrona52 min
Aug 5, 5:30 PM MDTSpecial Weather StatementRIW30 min

Nearby

Special Weather Statements in Wyoming, 2018Every special weather statement in 2018

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.