Alert archive / Wyoming / Special Weather Statements in 2023

Special Weather Statement, NWS Cheyenne, WY

August 1, 2023Platte County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Aug 1, 2023, 7:01 PM MDT for Platte County, Wyoming. It was in force for 44 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, 2023, 7:01 PM MDT (01:01 UTC)
Expired: Aug 1, 2023, 7:45 PM MDT
In force: 44 min
Issued by: NWS Cheyenne, WY
Hail: 0.25 in
Wind: 40

County Platte County, WY

The radar

The Cheyenne radar (KCYS), 99 km from the middle of the area, began a volume at 01:05 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

Rapid City, SD (KUNR), launched 00:00Z, 1.0 hours before the alert went out and 288 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: 864 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1857 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 43 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, 5:44 PM MDT, 1 hour 17 minutes earlier.

Area forecast discussion, Aug 1, 5:44 PM MDT, 1 hour 17 minutes before

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Hazardous weather outlook, Aug 1, 4:10 AM MDT, 14 hours 51 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
410 AM MDT Tue Aug 1 2023

NEZ002-003-021-055-WYZ101-104-105-109>114-021015-
Dawes County-Box Butte County-Morrill County-Cheyenne County-
Converse County Lower Elevations-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-
410 AM MDT Tue Aug 1 2023

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

.DAY ONE...TODAY AND TONIGHT

Scattered showers and thunderstorms will occur this afternoon and
evening, with some storms producing locally heavy rainfall, small
hail and gusty winds.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

Scattered to numerous showers, and scattered thunderstorms, will
occur during the afternoons and evenings.

.Spotter information statement...

Spotter activation will not be needed.

NEZ019-020-054-095-096-WYZ102-103-106>108-115>119-021015-
Scotts Bluff County-Banner County-Kimball County-
Northern Sioux County-Southern Sioux County-Niobrara County-
North Laramie Range-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Laramie Valley-
South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
410 AM MDT Tue Aug 1 2023

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

.DAY ONE...TODAY AND TONIGHT

A Flood Watch is in effect from 2 PM to midnight. Scattered to
numerous showers, and scattered thunderstorms will occur this
afternoon and evening. Some of the storms will produce locally
heavy rain and possible flooding, along with small hail and gusty
winds.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

Scattered to numerous showers, and scattered thunderstorms, will
occur during the afternoons and evenings.

.Spotter information statement...

Spotter activation will not be needed.

Rubin

In the hours before

Local storm report, Aug 1, 2:11 PM MDT, 4 hours 50 minutes before

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Local storm report, Aug 1, 2:12 PM MDT, 4 hours 49 minutes before

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Local storm report, Aug 1, 2:56 PM MDT, 4 hours 5 minutes before

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Local storm report, Aug 1, 2:57 PM MDT, 4 hours 4 minutes before

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Special weather statement, Aug 1, 5:49 PM MDT, 1 hour 12 minutes before

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Special weather statement, Aug 1, 7:01 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 7:21 PM MDT	Special Weather Statement	CYS	Platte	24 min
Aug 2, 2:28 AM MDT	Flood Watch	CYS	Albany, Carbon, Laramie, Platte	19 hr
Aug 2, 1:16 PM MDT	Special Weather Statement	CYS	Goshen	29 min
Aug 2, 2:00 PM MDT	Areal Flood Advisory	CYS	Platte	3 hr
Aug 2, 4:04 PM MDT	Areal Flood Advisory	CYS	Carbon	3 hr
Aug 2, 4:35 PM MDT	Special Weather Statement	CYS	Laramie	40 min
Aug 2, 4:50 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min
Aug 2, 5:20 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min
Aug 2, 3:19 PM MDT	Special Weather Statement	CYS	Cheyenne	56 min
Aug 2, 3:57 PM MDT	Areal Flood Advisory	CYS	Cheyenne	3 hr
Aug 2, 4:05 PM MDT	Special Weather Statement	CYS	Banner	40 min
Aug 2, 4:14 PM MDT	Special Weather Statement	CYS	Cheyenne	46 min
Aug 2, 5:11 PM MDT	Special Weather Statement	CYS	Morrill	49 min
Aug 2, 5:38 PM MDT	Special Weather Statement	CYS	Dawes	37 min

Nearby

Special Weather Statements in Wyoming, 2023 Every special weather statement in 2023

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.