Alert archive / Wyoming / Special Weather Statements in 2020

Special Weather Statement, NWS Cheyenne, WY

August 5, 2020

NWS Cheyenne, WY issued this special weather statement at Aug 5, 2020, 3:03 PM MDT. It was in force for 42 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, 2020, 3:03 PM MDT (21:03 UTC)
Expired
Aug 5, 2020, 3:45 PM MDT
In force
42 min
Issued by
NWS Cheyenne, WY

The radar

The Cheyenne radar (KCYS), 168 km from the middle of the area, began a volume at 21:06 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, 9.1 hours before the alert went out and 220 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, Riverton, WY at 12:00Z on 2020-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 118 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2020-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 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
118 J/kg
Mixed-layer CIN
-295 J/kg
Mixed-layer LCL
2002 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 5, 12:02 PM MDT, 3 hours 1 minute earlier.

Area forecast discussion, Aug 5, 12:02 PM MDT, 3 hours 1 minute before
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Hazardous weather outlook, Aug 5, 4:17 AM MDT, 10 hours 46 minutes before
Hazardous Weather Outlook
National Weather Service Cheyenne WY
417 AM MDT Wed Aug 5 2020

WYZ104-105-109>115-061030-
Ferris/Seminoe/Shirley Mountains-Shirley Basin-
Central Carbon County-North Snowy Range Foothills-
Southwest Carbon County-Sierra Madre Range-
Upper North Platte River Basin-Snowy Range-Laramie Valley-
417 AM MDT Wed Aug 5 2020

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

.DAY ONE...TODAY AND TONIGHT

Isolated afternoon thunderstorms possible. Storms may produce
strong, gusty winds and dry lightning.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Decreasing thunderstorm potential day by day as the area dries out
under the influence of a ridge. Fire weather conditions will be
the main concern.

.Spotter information statement...

Spotter activation will not be required.

NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-116>119-
061030-
Dawes-Box Butte-Scotts Bluff County-Banner County-Morrill-
Kimball County-Cheyenne-North Sioux-South Sioux-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-South Laramie Range-
South Laramie Range Foothills-Central Laramie County-
East Laramie County-
417 AM MDT Wed Aug 5 2020

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

.DAY ONE...TODAY AND TONIGHT

Widely scattered thunderstorms will develop near and along the
Laramie Range after noon and move eastward into the High Plains
by mid-afternoon, reaching the western Nebraska Panhandle by late
afternoon. Strong to severe thunderstorms producing large hail
and strong gusty winds will be possible along and east of the
Interstate 25 corridor; an isolated tornado cannot be ruled out.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Scattered afternoon and evening thunderstorms will develop
Thursday; some may be strong to severe. Storms become more
isolated and confined to the mountains Friday and Saturday.

.Spotter information statement...

Spotter activation may be needed this afternoon along and east of
the I-25 corridor.

In the hours before

Special weather statement, Aug 5, 1:59 PM MDT, 1 hour 4 minutes before
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Special weather statement, Aug 5, 2:05 PM MDT, 58 minutes before
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Special weather statement, Aug 5, 2:27 PM MDT, 36 minutes before
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Special weather statement, Aug 5, 2:45 PM MDT, 18 minutes before
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Special weather statement, Aug 5, 2:53 PM MDT, 10 minutes before
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Special weather statement, Aug 5, 3:03 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 4, 6:17 PM MDTSpecial Weather StatementCYSAlbany43 min
Aug 4, 6:34 PM MDTSpecial Weather StatementCYS41 min
Aug 4, 7:00 PM MDTSpecial Weather StatementCYSAlbany45 min
Aug 4, 7:42 PM MDTSpecial Weather StatementCYS33 min
Aug 4, 7:59 PM MDTSpecial Weather StatementCYSCarbon46 min
Aug 4, 8:45 PM MDTSpecial Weather StatementCYSAlbany45 min
Aug 4, 9:28 PM MDTSpecial Weather StatementCYSAlbany, Platte47 min
Aug 4, 10:50 PM MDTSpecial Weather StatementCYSGoshen, Laramie, Platte40 min
Aug 4, 11:31 PM MDTSpecial Weather StatementCYSGoshen44 min
Aug 5, 12:21 AM MDTSpecial Weather StatementCYSLaramie24 min
Aug 5, 2:50 AM MDTRed Flag WarningCYS41 hr
Aug 5, 1:23 PM MDTSpecial Weather StatementCYSLaramie52 min
Aug 5, 1:59 PM MDTSpecial Weather StatementCYSLaramie46 min
Aug 5, 2:05 PM MDTSpecial Weather StatementCYSConverse40 min
Aug 5, 2:27 PM MDTSpecial Weather StatementCYSLaramie48 min
Aug 5, 2:34 PM MDTFire Weather WatchCYS13 hr
Aug 5, 2:45 PM MDTSpecial Weather StatementCYSPlatte45 min
Aug 5, 2:53 PM MDTSpecial Weather StatementCYSPlatte52 min
Aug 5, 3:16 PM MDTSpecial Weather StatementCYSLaramie44 min
Aug 5, 3:42 PM MDTSpecial Weather StatementCYSAlbany48 min
Aug 5, 3:57 PM MDTSpecial Weather StatementCYSConverse48 min
Aug 5, 4:07 PM MDTSpecial Weather StatementCYSPlatte38 min
Aug 5, 4:22 PM MDTSpecial Weather StatementCYSConverse38 min
Aug 5, 4:34 PM MDTSevere Thunderstorm WarningCYSConverse28 min
Aug 5, 4:50 PM MDTSpecial Weather StatementCYSConverse40 min
Aug 5, 4:52 PM MDTSpecial Weather StatementCYSLaramie38 min
Aug 5, 4:58 PM MDTSpecial Weather StatementCYSPlatte47 min
Aug 5, 5:01 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte44 min
Aug 5, 5:19 PM MDTSpecial Weather StatementCYSConverse41 min
Aug 5, 5:21 PM MDTSpecial Weather StatementCYSGoshen39 min
Aug 5, 5:34 PM MDTSpecial Weather StatementCYSPlatte41 min
Aug 5, 5:41 PM MDTSpecial Weather StatementCYSNiobrara49 min
Aug 5, 12:15 AM MDTSpecial Weather StatementCYSBanner, Kimball60 min
Aug 5, 3:50 PM MDTSpecial Weather StatementCYSBox Butte40 min
Aug 5, 3:59 PM MDTSpecial Weather StatementCYSSioux46 min
Aug 5, 4:32 PM MDTSevere Thunderstorm WarningCYSSioux43 min
Aug 5, 4:55 PM MDTSpecial Weather StatementCYSSioux50 min
Aug 5, 5:31 PM MDTSpecial Weather StatementCYSMorrill44 min

Nearby

Special Weather Statements in Wyoming, 2020Every special weather statement in 2020

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.