Alert archive / Wyoming / Special Weather Statements in 2018

Special Weather Statement, NWS Riverton, WY

August 3, 2018

NWS Riverton, WY issued this special weather statement at Aug 3, 2018, 3:51 PM MDT. It was in force for 39 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 3, 2018, 3:51 PM MDT (21:51 UTC)
Expired: Aug 3, 2018, 4:30 PM MDT
In force: 39 min
Issued by: NWS Riverton, WY

The radar

The Riverton/Lander radar (KRIW), 68 km from the middle of the area, began a volume at 21:54 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, 9.9 hours before the alert went out and 64 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: 25 J/kg
Mixed-layer CIN: -283 J/kg
Mixed-layer LCL: 2423 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 96 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 3, 1:51 PM MDT, 2 hours earlier.

Area forecast discussion, Aug 3, 1:51 PM MDT, 2 hours before

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Hazardous weather outlook, Aug 3, 2:07 AM MDT, 13 hours 44 minutes before

Hazardous Weather Outlook
National Weather Service Riverton WY
207 AM MDT Fri Aug 3 2018

WYZ001>020-022>030-041100-
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-
207 AM MDT Fri Aug 3 2018

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

...A Fire Weather Watch is in effect for Sweetwater, Uinta, and
Southern Lincoln counties Saturday and Sunday...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Scattered afternoon and evening thunderstorms. The main threat
will be gusty outflow winds of 50 to 55 mph possible. Warm
conditions and gusty winds will elevate fire weather conditions
across southern and western portions this afternoon and early
evening.

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

Saturday and Sunday...Warm with gusty west wind will elevate fire
weather conditions across southern Wyoming during the afternoon
and early evening. Isolated to scattered afternoon and evening
thunderstorms across mainly northern Wyoming.

.SPOTTER INFORMATION STATEMENT...

Spotters are urged to report wind gusts past 45 mph. Thank you.

In the hours before

Special weather statement, Aug 3, 3:00 PM MDT, 51 minutes before

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Special weather statement, Aug 3, 3:15 PM MDT, 36 minutes before

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Special weather statement, Aug 3, 3:18 PM MDT, 33 minutes before

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Special weather statement, Aug 3, 3:23 PM MDT, 28 minutes before

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Special weather statement, Aug 3, 3:27 PM MDT, 24 minutes before

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Special weather statement, Aug 3, 3:51 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
Aug 2, 6:09 PM MDT	Special Weather Statement	RIW	Park	36 min
Aug 2, 6:17 PM MDT	Special Weather Statement	RIW	Park	28 min
Aug 2, 6:23 PM MDT	Special Weather Statement	RIW	Lincoln	37 min
Aug 2, 6:51 PM MDT	Special Weather Statement	RIW	Park	24 min
Aug 2, 6:57 PM MDT	Special Weather Statement	RIW	Park	33 min
Aug 2, 7:09 PM MDT	Special Weather Statement	RIW	Lincoln	36 min
Aug 2, 7:20 PM MDT	Special Weather Statement	RIW	Park	25 min
Aug 2, 7:53 PM MDT	Special Weather Statement	RIW	Fremont	22 min
Aug 2, 7:58 PM MDT	Special Weather Statement	RIW	Big Horn	32 min
Aug 2, 8:20 PM MDT	Special Weather Statement	RIW	Fremont	25 min
Aug 2, 8:24 PM MDT	Special Weather Statement	RIW	Big Horn	36 min
Aug 2, 8:33 PM MDT	Special Weather Statement	RIW	Big Horn	27 min
Aug 2, 9:29 PM MDT	Special Weather Statement	RIW	Fremont	31 min
Aug 3, 2:01 AM MDT	Red Flag Warning	RIW	Lincoln, Uinta	19 hr
Aug 3, 12:50 PM MDT	Special Weather Statement	RIW	Fremont	25 min
Aug 3, 1:16 PM MDT	Special Weather Statement	RIW		29 min
Aug 3, 1:22 PM MDT	Special Weather Statement	RIW		23 min
Aug 3, 1:43 PM MDT	Special Weather Statement	RIW	Fremont	47 min
Aug 3, 1:45 PM MDT	Special Weather Statement	RIW		45 min
Aug 3, 1:48 PM MDT	Special Weather Statement	RIW		42 min
Aug 3, 2:00 PM MDT	Special Weather Statement	RIW	Big Horn, Hot Springs, Washakie	30 min
Aug 3, 2:05 PM MDT	Special Weather Statement	RIW		25 min
Aug 3, 2:20 PM MDT	Special Weather Statement	RIW		40 min
Aug 3, 2:24 PM MDT	Special Weather Statement	RIW	Fremont	36 min
Aug 3, 2:26 PM MDT	Special Weather Statement	RIW		34 min
Aug 3, 2:32 PM MDT	Special Weather Statement	RIW	Big Horn, Hot Springs, Washakie	43 min
Aug 3, 2:51 PM MDT	Special Weather Statement	RIW	Hot Springs	24 min
Aug 3, 2:57 PM MDT	Special Weather Statement	RIW	Fremont	48 min
Aug 3, 3:00 PM MDT	Special Weather Statement	RIW	Natrona	45 min
Aug 3, 3:15 PM MDT	Special Weather Statement	RIW	Fremont	30 min
Aug 3, 3:18 PM MDT	Special Weather Statement	RIW	Washakie	27 min
Aug 3, 3:23 PM MDT	Special Weather Statement	RIW		22 min
Aug 3, 3:27 PM MDT	Special Weather Statement	RIW		48 min
Aug 3, 3:53 PM MDT	Special Weather Statement	RIW	Big Horn	52 min
Aug 3, 4:29 PM MDT	Special Weather Statement	RIW	Johnson	31 min
Aug 3, 4:40 PM MDT	Special Weather Statement	RIW	Washakie	35 min
Aug 3, 5:03 PM MDT	Special Weather Statement	RIW	Johnson	27 min
Aug 3, 5:14 PM MDT	Special Weather Statement	RIW	Sublette	31 min
Aug 3, 5:32 PM MDT	Special Weather Statement	RIW	Johnson	28 min

Nearby

Special Weather Statements in Wyoming, 2018 Every 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.