Alert archive / Wyoming / Special Weather Statements in 2018

Special Weather Statement, NWS Cheyenne, WY

August 5, 2018Carbon County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Aug 5, 2018, 2:50 AM MDT for Carbon County, Wyoming. It was in force for 40 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 5, 2018, 2:50 AM MDT (08:50 UTC)
Expired
Aug 5, 2018, 3:30 AM MDT
In force
40 min
Issued by
NWS Cheyenne, WY

County Carbon County, WY

The radar

The Cheyenne radar (KCYS), 197 km from the middle of the area, began a volume at 08:56 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 (KDEN), launched 00:00Z, 8.8 hours before the alert went out and 379 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 2018-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 191 joules per kilogram.LCLLFCEL10008507005003002001001 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 2018-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.19395878Sfc1 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
191 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
3300 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
102 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 4, 10:55 PM MDT, 3 hours 55 minutes earlier.

Area forecast discussion, Aug 4, 10:55 PM MDT, 3 hours 55 minutes before
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Hazardous weather outlook, Aug 4, 6:16 AM MDT, 20 hours 34 minutes before
Hazardous Weather Outlook
National Weather Service Cheyenne WY
616 AM MDT Sat Aug 4 2018

WYZ104-109>111-051230-
Ferris/Seminoe/Shirley Mountains-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
616 AM MDT Sat Aug 4 2018

This hazardous weather outlook is for portions of south central
Wyoming.

.DAY ONE...TODAY AND TONIGHT

A Red Flag Warning is in effect this afternoon and early evening
for western Carbon county. Warm, dry and breezy conditions will
create dangerous fire weather conditions. Any fires that develop
could spread quickly.

Scattered showers and thunderstorms are expected this afternoon
and tonight. Severe weather is not expected. However, a few storms
may produce gusty winds.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Scattered showers and thunderstorms will develop again on Sunday
across portions of southeast Wyoming. Some storms could be strong,
with small hail and gusty winds the primary hazards.

.Spotter information statement...

Spotter activation will not be needed.

NEZ002-003-019>021-054-055-095-096-WYZ101>103-105>108-112>119-
051230-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-Converse County Lower Elevations-
Niobrara County-North Laramie Range-Shirley Basin-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Sierra Madre Range-
Upper North Platte River Basin-Snowy Range-Laramie Valley-
South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
616 AM MDT Sat Aug 4 2018

This hazardous weather outlook is for portions of western
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Scattered showers and thunderstorms are expected this afternoon
and tonight across southeast Wyoming and the western Nebraska
Panhandle. Severe weather is not expected. However, a few strong
storms are possible with small hail and gusty winds the primary
hazards.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Scattered showers and thunderstorms will develop again on Sunday across
southeast Wyoming and the western Nebraska Panhandle. Severe
weather is not expected. However, a few strong storms are possible
with small hail and gusty winds the primary hazards.

.Spotter information statement...

Spotter activation will not be needed.

In the hours before

Special weather statement, Aug 5, 2:50 AM 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 5, 9:29 AM MDTSpecial Weather StatementCYSCarbon46 min
Aug 5, 9:59 AM MDTSpecial Weather StatementCYSCarbon46 min
Aug 5, 10:45 AM MDTSpecial Weather StatementCYSCarbon45 min
Aug 5, 11:16 AM MDTSevere Thunderstorm WarningCYSAlbany, Carbon44 min
Aug 5, 11:52 AM MDTSevere Thunderstorm WarningCYSAlbany, Carbon38 min
Aug 5, 12:24 PM MDTSevere Thunderstorm WarningCYSAlbany, Laramie, Platte36 min
Aug 5, 1:01 PM MDTSevere Thunderstorm WarningCYSLaramie29 min
Aug 5, 1:30 PM MDTSevere Thunderstorm WarningCYSLaramie30 min
Aug 5, 2:25 PM MDTSpecial Weather StatementCYSCarbon50 min
Aug 5, 3:22 PM MDTSpecial Weather StatementCYSCarbon38 min
Aug 5, 4:54 PM MDTSpecial Weather StatementCYSLaramie51 min
Aug 5, 5:07 PM MDTSpecial Weather StatementCYSConverse53 min
Aug 5, 5:11 PM MDTSevere Thunderstorm WarningCYSCarbon33 min
Aug 5, 5:20 PM MDTSpecial Weather StatementCYSLaramie25 min
Aug 5, 5:28 PM MDTSpecial Weather StatementCYSConverse32 min
Aug 5, 5:40 PM MDTSpecial Weather StatementCYSLaramie35 min
Aug 5, 5:43 PM MDTSpecial Weather StatementCYSCarbon47 min
Aug 5, 5:59 PM MDTSpecial Weather StatementCYSNiobrara31 min
Aug 5, 1:58 PM MDTSpecial Weather StatementCYSKimball47 min
Aug 5, 2:48 PM MDTSpecial Weather StatementCYSCheyenne42 min
Aug 5, 3:19 PM MDTSevere Thunderstorm WarningCYSCheyenne26 min

Nearby

Special Weather Statements in Wyoming, 2018Every special weather statement in 2018

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.