Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Cheyenne, WY

August 6, 2021Converse County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Aug 6, 2021, 2:13 PM MDT for Converse County, Wyoming. It was in force for 47 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: Aug 6, 2021, 2:13 PM MDT (20:13 UTC)
Expired: Aug 6, 2021, 3:00 PM MDT
In force: 47 min
Issued by: NWS Cheyenne, WY
Hail: 0.75 in
Wind: 55

County Converse County, WY

The radar

The Cheyenne radar (KCYS), 187 km from the middle of the area, began a volume at 20:12 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 12:00Z, 8.2 hours before the alert went out and 210 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1589 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

346 
WWUS85 KCYS 062013
SPSCYS

Special Weather Statement
National Weather Service Cheyenne WY
213 PM MDT Fri Aug 6 2021
 
WYZ101-103>105-062100-
Shirley Basin WY-Converse County Lower Elevations WY-
North Laramie Range WY-Ferris/Seminoe/Shirley Mountains WY-
213 PM MDT Fri Aug 6 2021

...Strong thunderstorms will impact portions of northeastern Carbon,
north central Albany and Converse Counties through 300 PM MDT...

At 213 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles east of Edgerton to 7 miles northwest
of Battle Mountain. Movement was east at 55 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Strong thunderstorms will be near...
  Windy Peak and Curtis Gulch Campground around 255 PM MDT.

This includes Interstate 25 in Wyoming between mile markers 141 and
175.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
east central Wyoming.

&&

LAT...LON 4219 10552 4211 10640 4243 10636 4244 10608
      4349 10608 4350 10530
TIME...MOT...LOC 2013Z 257DEG 46KT 4340 10609 4220 10629 

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...55 MPH

$$

Rubin

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 1:40 PM MDT	Special Weather Statement	CYS	Laramie	50 min
Aug 6, 2:33 PM MDT	Special Weather Statement	CYS	Laramie	42 min
Aug 6, 3:12 PM MDT	Special Weather Statement	CYS	Converse	48 min
Aug 6, 3:18 PM MDT	Severe Thunderstorm Warning Destructive damage threat	CYS	Albany, Laramie	42 min
Aug 6, 3:29 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Albany, Converse, Goshen, Niobrara, Platte	61 min
Aug 6, 4:08 PM MDT	Special Weather Statement	CYS	Niobrara	52 min
Aug 6, 3:09 PM MDT	Special Weather Statement	CYS	Scotts Bluff	51 min
Aug 6, 3:31 PM MDT	Special Weather Statement	CYS	Banner	44 min
Aug 6, 3:53 PM MDT	Special Weather Statement	CYS	Banner, Cheyenne, Morrill, Scotts Bluff	52 min
Aug 6, 5:15 PM MDT	Special Weather Statement	CYS	Dawes	45 min
Aug 6, 5:57 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	18 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.