Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 104, NWS Cheyenne, WY

July 14, 2021Carbon County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 14, 2021, 8:51 PM MDT for Carbon County, Wyoming. It was in force for 24 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 14, 2021, 8:51 PM MDT (02:51 UTC)
Expired: Jul 14, 2021, 9:15 PM MDT
In force: 24 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Carbon County, WY

The radar

The Riverton/Lander radar (KRIW), 177 km from the middle of the area, began a volume at 02:53 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, 2.9 hours before the alert went out and 174 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: 703 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 2288 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -44 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

391 
WUUS55 KCYS 150251
SVRCYS
WYC007-150315-
/O.NEW.KCYS.SV.W.0104.210715T0251Z-210715T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
851 PM MDT Wed Jul 14 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Central Carbon County in south central Wyoming...

* Until 915 PM MDT.

* At 851 PM MDT, a severe thunderstorm was located 9 miles southwest
  of Rawlins, moving east at 15 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Rawlins.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4165 10745 4170 10747 4177 10744 4177 10736
      4176 10720 4158 10729
TIME...MOT...LOC 0251Z 283DEG 13KT 4172 10739 

HAIL...1.00IN
WIND...<50MPH
 
$$

Mokry

1 follow-up statement

475 
WWUS55 KCYS 150311
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
911 PM MDT Wed Jul 14 2021

WYC007-150321-
/O.EXP.KCYS.SV.W.0104.000000T0000Z-210715T0315Z/
Carbon WY-
911 PM MDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CARBON COUNTY WILL
EXPIRE AT 915 PM MDT...
                
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 will be allowed to expire.

LAT...LON 4165 10745 4170 10747 4177 10744 4177 10736
      4176 10720 4158 10729
TIME...MOT...LOC 0311Z 283DEG 13KT 4171 10731 

$$

Mokry

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 6:03 PM MDT	Special Weather Statement	CYS	Albany	27 min
Jul 14, 6:17 PM MDT	Severe Thunderstorm Warning	CYS	Albany	43 min
Jul 14, 6:19 PM MDT	Special Weather Statement	CYS	Albany	26 min
Jul 14, 6:34 PM MDT	Severe Thunderstorm Warning	CYS	Albany	26 min
Jul 14, 6:59 PM MDT	Severe Thunderstorm Warning	CYS	Albany	46 min
Jul 14, 7:13 PM MDT	Special Weather Statement	CYS	Carbon	32 min
Jul 14, 7:45 PM MDT	Special Weather Statement	CYS	Carbon	45 min
Jul 14, 7:53 PM MDT	Special Weather Statement	CYS	Albany	37 min
Jul 14, 8:48 PM MDT	Special Weather Statement	CYS	Carbon	27 min
Jul 15, 3:55 PM MDT	Special Weather Statement	CYS	Laramie	35 min
Jul 15, 4:22 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	38 min
Jul 15, 4:42 PM MDT	Areal Flood Advisory	CYS	Laramie	3 hr
Jul 15, 4:59 PM MDT	Special Weather Statement	CYS	Laramie	46 min
Jul 15, 5:00 PM MDT	Special Weather Statement	CYS	Laramie	15 min
Jul 15, 5:33 PM MDT	Special Weather Statement	CYS	Laramie	12 min
Jul 15, 5:46 PM MDT	Special Weather Statement	CYS	Laramie	29 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.