Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Riverton, WY

May 19, 2021Hot Springs County, Wyoming

NWS Riverton, WY issued this special weather statement at May 19, 2021, 5:47 PM MDT for Hot Springs County, Wyoming. It was in force for 28 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
May 19, 2021, 5:47 PM MDT (23:47 UTC)
Expired
May 19, 2021, 6:15 PM MDT
In force
28 min
Issued by
NWS Riverton, WY

County Hot Springs County, WY

The radar

The Riverton/Lander radar (KRIW), 55 km from the middle of the area, began a volume at 23:48 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 11.8 hours before the alert went out and 428 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, Salt Lake City I, UT at 12:00Z on 2021-05-19Temperature 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 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2021-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2894 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
77 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 May 19, 2:01 PM MDT, 3 hours 46 minutes earlier.

Area forecast discussion, May 19, 2:01 PM MDT, 3 hours 46 minutes before
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Hazardous weather outlook, May 19, 3:12 AM MDT, 14 hours 35 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
312 AM MDT Wed May 19 2021

WYZ001>020-022>030-200915-
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-
312 AM MDT Wed May 19 2021

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Afternoon and evening thunderstorms possible across much of the
area, with the most numerous in the northwest.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...A good chance of thunderstorms across the northern half
of the area, some storms could be strong to severe. Strong winds
and elevated fire weather possible across southern Wyoming in the
afternoon.

Friday through Sunday...Widespread afternoon and evening
thunderstorms across the area. Some storms could be strong to
possibly severe.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, May 19, 4:43 PM MDT, 1 hour 4 minutes before
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Special weather statement, May 19, 5:14 PM MDT, 33 minutes before
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Special weather statement, May 19, 5:27 PM MDT, 20 minutes before
Special Weather Statement
National Weather Service Riverton WY
527 PM MDT Wed May 19 2021

WYZ017-200000-
Wind River Basin-
527 PM MDT Wed May 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL FREMONT COUNTY UNTIL 600
PM MDT...

At 527 PM MDT, Doppler radar was tracking a strong thunderstorm over
Arapahoe, or near Riverton, moving north at 35 mph.

Half inch hail and wind gusts of 50 to 55 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Ocean Lake around 545 PM MDT.

Other locations impacted by this storm include Arapahoe Elementary
School, St Stephens, Fremont County Fairgrounds and Riverton Regional
Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Brief heavy rainfall is also occurring with this storm.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4294 10833 4292 10857 4320 10866 4323 10829
TIME...MOT...LOC 2327Z 172DEG 32KT 4301 10847

Vorst
Special weather statement, May 19, 5:47 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Riverton WY
547 PM MDT Wed May 19 2021

WYZ005-007-017-200015-
Owl Creek and Bridger Mountains-Wind River Basin-Southwest Big Horn
Basin-
547 PM MDT Wed May 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL HOT SPRINGS AND
EAST CENTRAL FREMONT COUNTIES UNTIL 615 PM MDT...

At 546 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 12 miles south of Hamilton Dome to 8 miles
northeast of Ocean Lake. Movement was east at 30 mph.

Pea size hail and wind gusts up to 50 mph will be possible with these
storms.

Strong thunderstorms will be near...
  Thermopolis and Hot Springs State Park around 615 PM MDT.

Other locations impacted by these storms include Hot Springs County
Fairgrounds and Hot Springs County Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Brief heavy rainfall is also occurring with these storms.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

If on or near Ocean Lake and Boysen Reservoir, get out of the water
and move indoors or inside a vehicle. Remember, lightning can strike
out to 10 miles from the parent thunderstorm. If you can hear
thunder, you are close enough to be struck by lightning. Move to
safe shelter now! Do not be caught on the water in a thunderstorm.

&&

LAT...LON 4376 10814 4328 10798 4325 10852 4366 10866
TIME...MOT...LOC 2346Z 265DEG 24KT 4360 10858 4328 10849

Vorst

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 4:43 PM MDTSpecial Weather StatementRIWHot Springs32 min
May 19, 5:14 PM MDTSpecial Weather StatementRIWHot Springs31 min
May 19, 5:27 PM MDTSpecial Weather StatementRIWFremont33 min
May 19, 5:50 PM MDTSpecial Weather StatementRIWFremont25 min

Nearby

Special Weather Statements in Wyoming, 2021Every 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.