Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Cheyenne, WY

May 28, 2021Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at May 28, 2021, 9:21 PM MDT for Laramie 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: May 28, 2021, 9:21 PM MDT (03:21 UTC)
Expired: May 28, 2021, 9:45 PM MDT
In force: 24 min
Issued by: NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 44 km from the middle of the area, began a volume at 03:24 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

Denver, CO (KDNR), launched 00:00Z, 3.4 hours before the alert went out and 197 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: 138 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 3469 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

891 
WWUS85 KCYS 290321
SPSCYS

Special Weather Statement
National Weather Service Cheyenne WY
921 PM MDT Fri May 28 2021
 
WYZ118-119-290345-
Central Laramie County WY-East Laramie County WY-
921 PM MDT Fri May 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL LARAMIE COUNTY UNTIL
945 PM MDT...

At 920 PM MDT, Doppler radar was tracking a strong thunderstorm near
Gun Barrel, or 24 miles northeast of Cheyenne, moving east at 25 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Gun Barrel around 930 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4134 10453 4146 10453 4150 10442 4150 10420
      4128 10422
TIME...MOT...LOC 0320Z 269DEG 23KT 4139 10444 

$$

Jamski

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 6:58 PM MDT	Special Weather Statement	CYS	Niobrara	47 min
May 28, 8:44 PM MDT	Special Weather Statement	CYS	Niobrara	46 min
May 28, 9:05 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	40 min
May 28, 9:15 PM MDT	Areal Flood Advisory	CYS	Niobrara	72 min
May 29, 1:37 PM MDT	Special Weather Statement	CYS	Laramie	38 min
May 29, 2:06 PM MDT	Special Weather Statement	CYS	Laramie	24 min
May 29, 2:17 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	28 min
May 29, 5:55 PM MDT	Special Weather Statement	CYS	Platte	35 min
May 28, 9:45 PM MDT	Special Weather Statement	CYS	Sioux	45 min
May 28, 10:12 PM MDT	Special Weather Statement	CYS	Sioux	33 min
May 28, 10:25 PM MDT	Special Weather Statement	CYS	Sioux	35 min

Nearby

Special Weather Statements in Wyoming, 2021 Every 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.