Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Riverton, WY

June 23, 2021Park County, Teton County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 23, 2021, 6:00 PM MDT for Park County, Teton County, Wyoming. It was in force for 30 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: Jun 23, 2021, 6:00 PM MDT (00:00 UTC)
Expired: Jun 23, 2021, 6:30 PM MDT
In force: 30 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Park County, WY, Teton County, WY

The radar

The Pocatello radar (KSFX), 203 km from the middle of the area, began a volume at 00:00 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 00:00Z, 0.0 hours before the alert went out and 218 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: 3 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 3394 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

508 
WUUS55 KRIW 240000
SVRRIW
WYC029-039-240045-
/O.NEW.KRIW.SV.W.0003.210624T0000Z-210624T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Riverton WY
600 PM MDT Wed Jun 23 2021

The National Weather Service in Riverton has issued a

* Severe Thunderstorm Warning for...
  Central Park County in central Wyoming...
  Northern Teton County in northwestern Wyoming...

* Until 645 PM MDT.

* At 559 PM MDT, a severe thunderstorm was located 11 miles southwest
  of South Entrance, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  South Entrance around 615 PM MDT.

Other locations in the path of this severe thunderstorm include Lewis
Falls, Heart Lake, South Arm Of Lake Yellowstone and Southeast Arm Of
Lake Yellowstone.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

If on or near Lake Yellowstone or Heart Lake, get away from the 
water and move indoors or inside a vehicle. Remember, lightning can 
strike out to 15 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 4414 11105 4468 11031 4412 10975 4381 11104
TIME...MOT...LOC 2359Z 240DEG 38KT 4406 11087 

HAIL...1.00IN
WIND...60MPH
 
$$

Fisher

2 follow-up statements

526 
WWUS55 KRIW 240020
SVSRIW

Severe Weather Statement
National Weather Service Riverton WY
620 PM MDT Wed Jun 23 2021

WYC029-240028-
/O.CAN.KRIW.SV.W.0003.000000T0000Z-210624T0045Z/
Park-
620 PM MDT Wed Jun 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL PARK COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened. 
Therefore, the warning has been cancelled.

LAT...LON 4383 11095 4405 11102 4428 11045 4402 11019
      4387 11078
TIME...MOT...LOC 0018Z 252DEG 29KT 4398 11094 

$$

WYC039-240045-
/O.CON.KRIW.SV.W.0003.000000T0000Z-210624T0045Z/
Teton-
620 PM MDT Wed Jun 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT
FOR CENTRAL TETON COUNTY...

At 618 PM MDT, a severe thunderstorm was located 13 miles northwest
of Moran Bay, or 13 miles northeast of Felt, moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
  South Entrance.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

If on or near Yellowstone Lake, get away from the water and move 
indoors or inside a vehicle. remember, lightning can strike out to 
15 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 4383 11095 4405 11102 4428 11045 4402 11019
      4387 11078
TIME...MOT...LOC 0018Z 252DEG 29KT 4398 11094 

HAIL...1.00IN
WIND...60MPH
 
$$

Fisher

011 
WWUS55 KRIW 240030
SVSRIW

Severe Weather Statement
National Weather Service Riverton WY
630 PM MDT Wed Jun 23 2021

WYC039-240039-
/O.CAN.KRIW.SV.W.0003.000000T0000Z-210624T0045Z/
Teton-
630 PM MDT Wed Jun 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TETON COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail, 
gusty winds, and frequent lightning are still possible with this 
thunderstorm.

LAT...LON 4383 11095 4405 11102 4428 11045 4402 11019
      4387 11078
TIME...MOT...LOC 0024Z 240DEG 38KT 4404 11079 

$$

Fisher

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 12:51 PM MDT	Special Weather Statement	RIW	Johnson	24 min
Jun 24, 1:09 PM MDT	Areal Flood Advisory	RIW	Johnson	3 hr
Jun 24, 1:57 PM MDT	Special Weather Statement	RIW	Johnson	33 min
Jun 24, 2:53 PM MDT	Special Weather Statement	RIW	Johnson	37 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2021 Every severe thunderstorm warning 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.