Alert archive / Wyoming / Special Weather Statements in 2019

Special Weather Statement, NWS Cheyenne, WY

August 1, 2019Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Aug 1, 2019, 7:51 PM MDT for Laramie County, Wyoming. It was in force for 39 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 1, 2019, 7:51 PM MDT (01:51 UTC)
Expired
Aug 1, 2019, 8:30 PM MDT
In force
39 min
Issued by
NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 47 km from the middle of the area, began a volume at 01:54 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, 1.9 hours before the alert went out and 159 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2019-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2019-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2077 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
63 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 Aug 1, 5:51 PM MDT, 2 hours earlier.

Area forecast discussion, Aug 1, 5:51 PM MDT, 2 hours before
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Hazardous weather outlook, Aug 1, 6:35 PM MDT, 1 hour 16 minutes before
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In the hours before

Local storm report, Aug 1, 4:15 PM MDT, 3 hours 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
415 PM MDT THU AUG 1 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0408 PM     HAIL             DIX                     41.23N 103.49W
08/01/2019  E1.00 INCH       KIMBALL            NE   TRAINED SPOTTER

&&

RUBIN
Special weather statement, Aug 1, 4:21 PM MDT, 3 hours 30 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
421 PM MDT Thu Aug 1 2019

NEZ003-021-012300-
Box Butte NE-Morrill NE-
421 PM MDT Thu Aug 1 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL BOX BUTTE AND
NORTHWESTERN MORRILL COUNTIES UNTIL 500 PM MDT...

At 421 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles north of Angora to near Moomaws Corner.
Movement was southeast at 20 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Bridgeport, Court House And Jail Rocks, Bridgeport State Recreation
Area, Northport, Angora and The Intersection Of Highway 385 And L62.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4154 10314 4194 10335 4209 10313 4186 10267
      4179 10268
TIME...MOT...LOC 2221Z 319DEG 16KT 4198 10306 4188 10328

Hammer
Special weather statement, Aug 1, 4:25 PM MDT, 3 hours 26 minutes before
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Special weather statement, Aug 1, 7:33 PM MDT, 18 minutes before
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Special weather statement, Aug 1, 7:35 PM MDT, 16 minutes before
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Special weather statement, Aug 1, 7:51 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 8:35 PM MDTSevere Thunderstorm WarningCYSLaramie40 min
Aug 1, 7:33 PM MDTSpecial Weather StatementCYSCheyenne42 min
Aug 1, 7:35 PM MDTSpecial Weather StatementCYSSioux40 min
Aug 1, 8:12 PM MDTSpecial Weather StatementCYSCheyenne48 min
Aug 1, 8:14 PM MDTSpecial Weather StatementCYSSioux46 min
Aug 1, 8:26 PM MDTSpecial Weather StatementCYSKimball49 min

Nearby

Special Weather Statements in Wyoming, 2019Every special weather statement in 2019

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.