Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 133, NWS Cheyenne, WY

August 26, 2021Albany County, Carbon County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 26, 2021, 4:44 PM MDT for Albany County, Carbon County, Wyoming. It was in force for 31 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 26, 2021, 4:44 PM MDT (22:44 UTC)
Expired: Aug 26, 2021, 5:15 PM MDT
In force: 31 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Albany County, WY, Carbon County, WY

The radar

The Cheyenne radar (KCYS), 136 km from the middle of the area, began a volume at 22:47 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.

What was reported inside it

Time	Report	Where	Remark
Aug 26, 4:46 PM MDT	TSTM WND GST 60	7 Nw Elk Mountain, WY	MESONET STATION WY18 HALLECK RIDGE (WYDOT).

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 10.7 hours before the alert went out and 235 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: 22 J/kg
Mixed-layer CIN: -272 J/kg
Mixed-layer LCL: 2403 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

687 
WUUS55 KCYS 262244
SVRCYS
WYC001-007-262315-
/O.NEW.KCYS.SV.W.0133.210826T2244Z-210826T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
444 PM MDT Thu Aug 26 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  East central Carbon County in south central Wyoming...
  Western Albany County in southeastern Wyoming...

* Until 515 PM MDT.

* At 441 PM MDT, a severe thunderstorm was located near Elk Mountain,
  or 44 miles east of Rawlins, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Wyoming Department of Transportation Sensors Along 
           Interstate 80. 

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Elk Mountain and Arlington. 

This includes Interstate 80 in Wyoming between mile markers 241 and
281.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4150 10610 4169 10681 4181 10660 4164 10593
TIME...MOT...LOC 2241Z 216DEG 29KT 4172 10637 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Mokry

1 follow-up statement

427 
WWUS55 KCYS 262305
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
505 PM MDT Thu Aug 26 2021

WYC001-007-262315-
/O.EXP.KCYS.SV.W.0133.000000T0000Z-210826T2315Z/
Carbon WY-Albany WY-
505 PM MDT Thu Aug 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CARBON AND
WESTERN ALBANY COUNTIES WILL EXPIRE AT 515 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.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 4150 10610 4169 10681 4181 10660 4164 10593
TIME...MOT...LOC 2305Z 216DEG 29KT 4187 10623 

$$

Mokry

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 1:56 AM MDT	Fire Weather Watch	CYS		12 hr
Aug 26, 1:27 PM MDT	Red Flag Warning	CYS		31 hr
Aug 26, 2:39 PM MDT	Special Weather Statement	CYS	Carbon	36 min
Aug 26, 3:26 PM MDT	Special Weather Statement	CYS	Carbon	34 min
Aug 26, 3:39 PM MDT	Special Weather Statement	CYS	Platte	36 min
Aug 26, 4:08 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	37 min
Aug 26, 4:23 PM MDT	Special Weather Statement	CYS	Platte	37 min
Aug 26, 5:27 PM MDT	Special Weather Statement	CYS	Albany	33 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.