Alert archive / Nebraska / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 303, NWS Cheyenne, WY

August 10, 2019Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 10, 2019, 5:30 PM MDT for Dawes County, Nebraska. It was in force for 15 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
Aug 10, 2019, 5:30 PM MDT (23:30 UTC)
Expired
Aug 10, 2019, 5:45 PM MDT
In force
15 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Dawes County, NE

The radar

The Rapid City radar (KUDX), 158 km from the middle of the area, began a volume at 23:32 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.5 hours before the alert went out and 274 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, N. Platte/Lee Bi, NE at 12:00Z on 2019-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1602 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, N. Platte/Lee Bi, NE at 12:00Z on 2019-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
1602 J/kg
Mixed-layer CIN
-207 J/kg
Mixed-layer LCL
1098 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 Aug 10, 5:15 PM MDT, 15 minutes earlier.

Area forecast discussion, Aug 10, 5:15 PM MDT, 15 minutes before
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Hazardous weather outlook, Aug 10, 3:16 AM MDT, 14 hours 14 minutes before
Hazardous Weather Outlook
National Weather Service Cheyenne WY
316 AM MDT Sat Aug 10 2019

NEZ002-003-019>021-054-055-095-096-WYZ101>119-110930-
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-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon 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-
316 AM MDT Sat Aug 10 2019

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 afternoon and evening thunderstorms will develop. A few
of the thunderstorms east of a Douglas to Cheyenne line may become
strong to severe, producing hail and strong winds.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Scattered to numerous thunderstorms are expected Sunday afternoon
and evening. Some of the thunderstorms east of a Douglas to
Cheyenne line will likely become strong to severe, producing
quarter size hail or larger, and wind gusts in excess of 60 mph.
The greatest threat for severe thunderstorms will be over the
southern Nebraska Panhandle.

Isolated afternoon and evening thunderstorms will occur Tuesday
and Wednesday.

.Spotter information statement...

Spotter activation will not be needed.

Rubin

In the hours before

Special weather statement, Aug 10, 2:31 PM MDT, 2 hours 59 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
231 PM MDT Sat Aug 10 2019

WYZ102-102115-
Niobrara County WY-
231 PM MDT Sat Aug 10 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN NIOBRARA COUNTY
UNTIL 315 PM MDT...

At 231 PM MDT, Doppler radar was tracking a strong thunderstorm 11
miles northeast of Lance Creek, or 23 miles north of Lusk, moving
northeast at 20 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Redbird and 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 4325 10405 4303 10405 4294 10459 4315 10465
      4344 10406
TIME...MOT...LOC 2031Z 238DEG 15KT 4311 10445

Lyons
Special weather statement, Aug 10, 3:02 PM MDT, 2 hours 28 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
302 PM MDT Sat Aug 10 2019

NEZ095-WYZ102-102145-
North Sioux NE-Niobrara County WY-
302 PM MDT Sat Aug 10 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SIOUX AND EAST
CENTRAL NIOBRARA COUNTIES UNTIL 345 PM MDT...

At 302 PM MDT, Doppler radar was tracking a strong thunderstorm 18
miles west of Montrose, or 21 miles northeast of Lusk, moving
northeast at 15 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

This storm will remain over mainly rural areas of northwestern Sioux
and east central Niobrara Counties.

LAT...LON 4300 10405 4300 10374 4294 10369 4280 10410
      4296 10423 4306 10406
TIME...MOT...LOC 2102Z 238DEG 13KT 4292 10409

Lyons
Special weather statement, Aug 10, 3:53 PM MDT, 1 hour 37 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
353 PM MDT Sat Aug 10 2019

NEZ002-095-102230-
Dawes NE-North Sioux NE-
353 PM MDT Sat Aug 10 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DAWES AND
NORTHEASTERN SIOUX COUNTIES UNTIL 430 PM MDT...

At 353 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Montrose, or 34 miles south of Edgemont, moving
northeast at 20 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Montrose.

LAT...LON 4272 10367 4282 10384 4300 10370 4283 10350
TIME...MOT...LOC 2153Z 223DEG 17KT 4281 10370

Mokry
Special weather statement, Aug 10, 4:05 PM MDT, 1 hour 25 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
405 PM MDT Sat Aug 10 2019

NEZ095-102230-
North Sioux NE-
405 PM MDT Sat Aug 10 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SIOUX COUNTY UNTIL
430 PM MDT...

At 405 PM MDT, Doppler radar was tracking a strong thunderstorm near
Montrose, or 29 miles south of Edgemont, moving north at 15 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Montrose.

LAT...LON 4300 10366 4276 10374 4268 10384 4273 10397
      4288 10398 4301 10391 4300 10367
TIME...MOT...LOC 2205Z 187DEG 14KT 4287 10384

Mokry
Special weather statement, Aug 10, 5:01 PM MDT, 29 minutes before
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Special weather statement, Aug 10, 5:17 PM MDT, 13 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 1:37 PM MDTFire Weather WatchCYS36 hr
Aug 10, 2:31 PM MDTSpecial Weather StatementCYSNiobrara44 min
Aug 10, 2:46 PM MDTSevere Thunderstorm WarningCYSNiobrara14 min
Aug 10, 3:02 PM MDTSpecial Weather StatementCYSNiobrara43 min
Aug 10, 3:33 PM MDTSevere Thunderstorm WarningCYSNiobrara12 min
Aug 10, 4:05 PM MDTSpecial Weather StatementCYSSioux25 min
Aug 10, 4:08 PM MDTSevere Thunderstorm WarningCYSSioux22 min
Aug 10, 4:30 PM MDTSevere Thunderstorm WarningCYSSioux30 min
Aug 10, 5:01 PM MDTSpecial Weather StatementCYSDawes29 min
Aug 10, 5:17 PM MDTSpecial Weather StatementCYSDawes43 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2019Every 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.