Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Cheyenne, WY

July 14, 2021Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jul 14, 2021, 1:52 PM MDT for Laramie County, Wyoming. It was in force for 38 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, 1:52 PM MDT (19:52 UTC)
Expired: Jul 14, 2021, 2:30 PM MDT
In force: 38 min
Issued by: NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 37 km from the middle of the area, began a volume at 19:52 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 12:00Z, 7.9 hours before the alert went out and 232 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: 2082 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this special weather statement went out at Jul 14, 11:40 AM MDT, 2 hours 12 minutes earlier.

Area forecast discussion, Jul 14, 11:40 AM MDT, 2 hours 12 minutes before

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Hazardous weather outlook, Jul 14, 5:25 AM MDT, 8 hours 27 minutes before

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In the hours before

Special weather statement, Jul 14, 1:52 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
152 PM MDT Wed Jul 14 2021

WYZ116>118-142030-
South Laramie Range WY-Central Laramie County WY-
South Laramie Range Foothills WY-
152 PM MDT Wed Jul 14 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ALBANY AND
NORTHWESTERN LARAMIE COUNTIES UNTIL 230 PM MDT...

At 151 PM MDT, Doppler radar was tracking a strong thunderstorm over
Horse Creek, or 22 miles northeast of Laramie, moving east southeast
at 30 mph.

Penny size hail and winds in excess of 30 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Whitaker around 220 PM MDT.

This includes Interstate 25 in Wyoming between mile markers 18 and
36.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4140 10532 4155 10526 4149 10470 4122 10478
TIME...MOT...LOC 1951Z 284DEG 31KT 4145 10519

Trudel

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 6:42 PM MDT	Special Weather Statement	CYS	Converse	33 min
Jul 13, 7:13 PM MDT	Special Weather Statement	CYS	Converse	32 min
Jul 14, 2:43 PM MDT	Special Weather Statement	CYS	Laramie	47 min
Jul 14, 2:46 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	29 min
Jul 14, 2:57 PM MDT	Special Weather Statement	CYS	Laramie	48 min
Jul 14, 3:11 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	34 min
Jul 14, 3:41 PM MDT	Special Weather Statement	CYS	Laramie	34 min
Jul 14, 4:13 PM MDT	Special Weather Statement	CYS	Laramie	32 min
Jul 14, 5:08 PM MDT	Special Weather Statement	CYS	Laramie	37 min
Jul 13, 10:30 PM MDT	Special Weather Statement	CYS	Box Butte, Scotts Bluff	45 min
Jul 13, 10:54 PM MDT	Areal Flood Advisory	CYS	Scotts Bluff	17 min
Jul 13, 11:07 PM MDT	Flash Flood Warning	CYS	Scotts Bluff	2 hr
Jul 13, 11:08 PM MDT	Special Weather Statement	CYS	Banner	37 min
Jul 13, 11:16 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill, Scotts Bluff	44 min
Jul 13, 11:31 PM MDT	Flash Flood Warning	CYS	Banner, Morrill, Scotts Bluff	2 hr

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.