Alert archive / Wyoming / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 272, NWS Cheyenne, WY

July 30, 2019Niobrara County, Wyoming; Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 30, 2019, 4:57 PM MDT for Niobrara County, Wyoming; Sioux County, Nebraska. It was in force for 33 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: Jul 30, 2019, 4:57 PM MDT (22:57 UTC)
Expired: Jul 30, 2019, 5:30 PM MDT
In force: 33 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Sioux County, NE, Niobrara County, WY

The radar

The Rapid City radar (KUDX), 183 km from the middle of the area, began a volume at 22:58 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.

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 Jul 30, 2:06 PM MDT, 2 hours 51 minutes earlier.

Area forecast discussion, Jul 30, 2:06 PM MDT, 2 hours 51 minutes before

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Hazardous weather outlook, Jul 30, 4:14 AM MDT, 12 hours 43 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
414 AM MDT Tue Jul 30 2019

WYZ104-105-109>115-311015-
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-
414 AM MDT Tue Jul 30 2019

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

.DAY ONE...TODAY AND TONIGHT

Gusty winds, warm temperatures and very low humidities will create
elevated to critical fire weather conditions west of the Laramie
Range this afternoon. A Red Flag Warning is in effect from noon
until 8 PM for southwest Carbon County.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

Scattered mainly afternoon and evening thunderstorms are forecast
Wednesday through Monday. The threat for severe weather is low.

.Spotter information statement...

Spotter activation will not be required.

NEZ003-019>021-054-055-096-WYZ103-106>108-116>119-311015-
Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
South Sioux-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-
414 AM MDT Tue Jul 30 2019

This hazardous weather outlook is for portions of the western
Nebraska Panhandle and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Isolated afternoon and early evening thunderstorms will develop.
Severe weather is not expected.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

Scattered mainly afternoon and evening thunderstorms are forecast
Wednesday through Monday. The threat for severe weather is low.

.Spotter information statement...

Spotter activation will not be required.

NEZ002-095-WYZ101-102-311015-
Dawes-North Sioux-Converse County Lower Elevations-
Niobrara County-
414 AM MDT Tue Jul 30 2019

This hazardous weather outlook is for portions of the western
Nebraska Panhandle and east central Wyoming.

.DAY ONE...TODAY AND TONIGHT

Widely scattered late afternoon and evening thunderstorms will
develop. Isolated severe thunderstorms may produce large hail and
damaging winds, mainly north of a line from Douglas, Wyoming to
Chadron, Nebraska.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

Scattered mainly afternoon and evening thunderstorms are forecast
Wednesday through Monday. The threat for severe weather is low.

.Spotter information statement...

Spotter activation may be required between 3 pm this afternoon and
11 pm this evening.

In the hours before

Local storm report, Jul 30, 11:57 AM MDT, 5 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1157 AM MDT TUE JUL 30 2019

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

0700 PM     HAIL             10 W BEREA              42.20N 103.19W
07/29/2019  E2.75 INCH       BOX BUTTE          NE   EMERGENCY MNGR

            DELAYED REPORT FROM EMERGENCY MANAGER. TIME ESTIMATED
            FROM RADAR. SEVERAL VEHICLES HAD WINDOWS BROKEN OUT.

&&

GCLAYCOM

Special weather statement, Jul 30, 4:06 PM MDT, 51 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
406 PM MDT Tue Jul 30 2019

WYZ101-102-302245-
Converse County Lower Elevations WY-Niobrara County WY-
406 PM MDT Tue Jul 30 2019

...SPECIAL WEATHER STATEMENT...

At 405 PM MDT, Doppler radar was tracking a strong thunderstorm 11
miles southeast of Bill, or 25 miles northeast of Douglas, moving
east at 20 mph.

Pea size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Lance Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4301 10519 4315 10520 4324 10473 4298 10468
TIME...MOT...LOC 2205Z 261DEG 16KT 4307 10512

Worley

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:17 PM MDT	Red Flag Warning	CYS		24 hr
Jul 29, 10:23 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	52 min
Jul 30, 4:06 PM MDT	Special Weather Statement	CYS	Niobrara	39 min
Jul 30, 5:39 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	36 min
Jul 29, 6:44 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	46 min
Jul 29, 6:49 PM MDT	Areal Flood Advisory	CYS	Box Butte	3 hr
Jul 29, 7:08 PM MDT	Special Weather Statement	CYS	Dawes	37 min
Jul 29, 7:20 PM MDT	Flash Flood Warning	CYS	Box Butte	117 min
Jul 29, 7:30 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	60 min
Jul 29, 9:42 PM MDT	Special Weather Statement	CYS	Sioux	33 min
Jul 29, 10:15 PM MDT	Special Weather Statement	CYS	Sioux	45 min
Jul 29, 10:48 PM MDT	Severe Thunderstorm Warning	CYS	Dawes, Sioux	42 min
Jul 29, 11:22 PM MDT	Special Weather Statement	CYS	Box Butte	53 min
Jul 29, 11:27 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	16 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2019 Severe Thunderstorm Warnings in Nebraska, 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; radar from the NEXRAD Level II archive.