Alert archive / Wyoming / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 17, NWS Cheyenne, WY

May 6, 2019Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 6, 2019, 5:35 PM MDT for Laramie County, Wyoming. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 6, 2019, 5:35 PM MDT (23:35 UTC)
Expired: May 6, 2019, 6:00 PM MDT
In force: 25 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 23:38 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 12:00Z, 11.6 hours before the alert went out and 202 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: 1072 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 6, 5:30 PM MDT, 5 minutes earlier.

Area forecast discussion, May 6, 5:30 PM MDT, 5 minutes before

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Hazardous weather outlook, May 6, 11:06 AM MDT, 6 hours 29 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
1106 AM MDT Mon May 6 2019

WYZ116-117-071715-
South Laramie Range-South Laramie Range Foothills-
1106 AM MDT Mon May 6 2019

This hazardous weather outlook is for portions of southeast
Wyoming.

.DAY ONE...THIS AFTERNOON AND TONIGHT

Scattered showers and thunderstorms are expected across southeast
Wyoming this afternoon and evening. A few storms may become strong
to marginally severe, with hail up to the size of quarters and
wind gusts in excess of 50 MPH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Showers and thunderstorms are possible again on Tuesday. Cooler
temperatures may allow for snow accumulations at higher elevations
on Wednesday and Thursday.

.Spotter information statement...

Spotter activation will not be needed. However, spotters are
encouraged to report hazardous weather to the National Weather
Service in Cheyenne.

WYZ112-114-071715-
Sierra Madre Range-Snowy Range-
1106 AM MDT Mon May 6 2019

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

Scattered showers and thunderstorms are expected across the higher
terrain of southeast Wyoming today and tonight.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Showers and thunderstorms are possible again on Tuesday. Cooler
temperatures may allow for snow accumulations at higher elevations
on Wednesday and Thursday.

.Spotter information statement...

Spotter activation will not be needed.

WYZ106-107-118-071715-
Central Laramie Range and Southwest Platte County-
East Platte County-Central Laramie County-
1106 AM MDT Mon May 6 2019

This hazardous weather outlook is for portions of southeast
Wyoming.

.DAY ONE...THIS AFTERNOON AND TONIGHT

Scattered showers and thunderstorms are expected across southeast
Wyoming this afternoon and evening. A few storms may become strong
to marginally severe, with hail up to the size of quarters and
wind gusts in excess of 50 MPH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Showers and thunderstorms are possible again on Tuesday.

.Spotter information statement...

Spotter activation will not be needed. However, spotters are
encouraged to report hazardous weather to the National Weather
Service in Cheyenne.

NEZ002-003-019>021-054-055-095-096-WYZ101>105-108>111-113-115-119-
071715-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-Converse County Lower Elevations-
Niobrara County-North Laramie Range-
Ferris/Seminoe/Shirley Mountains-Shirley Basin-Goshen County-
Central Carbon County-North Snowy Range Foothills-
Southwest Carbon County-Upper North Platte River Basin-
Laramie Valley-East Laramie County-
1106 AM MDT Mon May 6 2019

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

Scattered showers and thunderstorms are expected across southeast
Wyoming and the western Nebraska Panhandle today.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Showers and thunderstorms are possible again on Tuesday.

.Spotter information statement...

Spotter activation will not be needed.

In the hours before

Special weather statement, May 6, 4:42 PM MDT, 53 minutes before

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Local storm report, May 6, 4:52 PM MDT, 43 minutes before

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Local storm report, May 6, 4:53 PM MDT, 42 minutes before

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Local storm report, May 6, 4:57 PM MDT, 38 minutes before

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Local storm report, May 6, 5:07 PM MDT, 28 minutes before

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Local storm report, May 6, 5:11 PM MDT, 24 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
May 6, 12:09 PM MDT	Special Weather Statement	CYS	Laramie	51 min
May 6, 12:47 PM MDT	Special Weather Statement	CYS	Goshen	28 min
May 6, 1:21 PM MDT	Special Weather Statement	CYS	Laramie	24 min
May 6, 1:43 PM MDT	Special Weather Statement	CYS	Laramie	32 min
May 6, 2:10 PM MDT	Special Weather Statement	CYS	Laramie	35 min
May 6, 2:25 PM MDT	Special Weather Statement	CYS	Laramie	35 min
May 6, 2:29 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	31 min
May 6, 3:12 PM MDT	Special Weather Statement	CYS	Laramie	33 min
May 6, 3:19 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	26 min
May 6, 3:38 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	37 min
May 6, 3:41 PM MDT	Tornado Warning	CYS	Laramie	34 min
May 6, 4:05 PM MDT	Tornado Warning	CYS	Laramie	25 min
May 6, 4:23 PM MDT	Tornado Warning Tornado observed	CYS	Laramie	22 min
May 6, 4:34 PM MDT	Special Weather Statement	CYS	Laramie	26 min
May 6, 4:37 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	23 min
May 6, 4:42 PM MDT	Special Weather Statement	CYS	Carbon	33 min
May 6, 4:55 PM MDT	Severe Thunderstorm Warning	CYS	Carbon	50 min
May 6, 4:56 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	34 min
May 6, 5:47 PM MDT	Special Weather Statement	CYS		43 min
May 5, 8:37 PM MDT	Special Weather Statement	CYS	Morrill	38 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2019 Every severe thunderstorm warning 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.