Alert archive / Nebraska / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 362, NWS Cheyenne, WY

August 8, 2023Box Butte County, Morrill County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 8, 2023, 3:59 PM MDT for Box Butte County, Morrill County, Nebraska. It was in force for 31 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 8, 2023, 3:59 PM MDT (21:59 UTC)
Expired
Aug 8, 2023, 4:30 PM MDT
In force
31 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Damage threat
Considerable
Hail
1.75 in
Wind
50.0 mph

Counties Box Butte County, NE, Morrill County, NE

The radar

The Cheyenne radar (KCYS), 172 km from the middle of the area, began a volume at 21:59 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 8, 2:37 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.0 hours before the alert went out and 224 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 2023-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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 2023-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 square meters per square second.19395878Sfc1 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
4 J/kg
Mixed-layer CIN
-289 J/kg
Mixed-layer LCL
695 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
205 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 8, 3:31 PM MDT, 28 minutes earlier.

Area forecast discussion, Aug 8, 3:31 PM MDT, 28 minutes before
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Hazardous weather outlook, Aug 8, 2:53 PM MDT, 1 hour 6 minutes before
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In the hours before

Special weather statement, Aug 8, 2:38 PM MDT, 1 hour 21 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
238 PM MDT Tue Aug 8 2023

WYZ117>119-082100-
Central Laramie County WY-South Laramie Range Foothills WY-
East Laramie County WY-
238 PM MDT Tue Aug 8 2023

...A strong thunderstorm will impact portions of south central
Laramie County through 300 PM MDT...

At 237 PM MDT, Doppler radar was tracking a strong thunderstorm over
Frontier Park, or over Cheyenne, moving east at 30 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Cheyenne, South Greeley, Ranchettes, Warren AFB, Frontier Park, North
Cheyenne, Warren Af Base, Fox Farm-College and South Greeley High.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 2 and 19.
 Interstate 80 in Wyoming between mile markers 357 and 379.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
southeastern Wyoming.

&&

LAT...LON 4102 10492 4126 10491 4130 10450 4102 10447
TIME...MOT...LOC 2037Z 269DEG 26KT 4115 10482

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

Fuller
Local storm report, Aug 8, 2:42 PM MDT, 1 hour 17 minutes before
Preliminary Local Storm Report
National Weather Service Cheyenne WY
242 PM MDT Tue Aug 8 2023

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

0238 PM     Hail             2 E Cheyenne            41.15N 104.75W
08/08/2023  M0.88 inch       Laramie            WY   Storm Chaser

&&
Local storm report, Aug 8, 2:43 PM MDT, 1 hour 16 minutes before
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Local storm report, Aug 8, 2:48 PM MDT, 1 hour 11 minutes before
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Special weather statement, Aug 8, 3:10 PM MDT, 49 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
310 PM MDT Tue Aug 8 2023

NEZ003-021-082145-
Box Butte NE-Morrill NE-
310 PM MDT Tue Aug 8 2023

...A strong thunderstorm will impact portions of southeastern Box
Butte and northeastern Morrill Counties through 345 PM MDT...

At 309 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles southwest of Alliance, moving east at 20 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Alliance and Alliance Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.

&&

LAT...LON 4191 10312 4207 10309 4213 10274 4210 10274
      4209 10271 4207 10270 4201 10270 4200 10267
      4183 10268
TIME...MOT...LOC 2109Z 261DEG 19KT 4200 10298

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

Trudel
Special weather statement, Aug 8, 3:36 PM MDT, 23 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
336 PM MDT Tue Aug 8 2023

NEZ020-054-082200-
Kimball NE-Banner NE-
336 PM MDT Tue Aug 8 2023

...A strong thunderstorm will impact portions of northwestern Kimball
and south central Banner Counties through 400 PM MDT...

At 335 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Oliver Campground, or 11 miles northwest of Kimball,
moving east at 20 mph.

HAZARD...Winds in excess of 30 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Kimball.

This includes Interstate 80 in Nebraska between mile markers 21 and
22.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.

&&

LAT...LON 4127 10392 4145 10389 4145 10357 4121 10363
TIME...MOT...LOC 2135Z 276DEG 16KT 4135 10382

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...30 MPH

Fuller

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 2:38 PM MDTSpecial Weather StatementCYSLaramie22 min
Aug 8, 4:52 PM MDTSpecial Weather StatementCYSGoshen23 min
Aug 8, 5:39 PM MDTSpecial Weather StatementCYSPlatte36 min
Aug 7, 6:03 PM MDTSevere Thunderstorm Warning Considerable damage threatCYSDawes42 min
Aug 7, 6:41 PM MDTSevere Thunderstorm Warning Considerable damage threatCYSDawes49 min
Aug 7, 6:51 PM MDTSpecial Weather StatementCYSBox Butte39 min
Aug 7, 7:16 PM MDTSevere Thunderstorm WarningCYSDawes44 min
Aug 8, 3:10 PM MDTSpecial Weather StatementCYSMorrill35 min
Aug 8, 3:20 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill40 min
Aug 8, 3:23 PM MDTSevere Thunderstorm WarningCYSMorrill37 min
Aug 8, 3:36 PM MDTSpecial Weather StatementCYSKimball24 min
Aug 8, 4:29 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill46 min
Aug 8, 4:48 PM MDTSpecial Weather StatementCYSCheyenne42 min
Aug 8, 5:01 PM MDTSevere Thunderstorm WarningCYSCheyenne, Morrill29 min
Aug 8, 5:22 PM MDTSpecial Weather StatementCYSBox Butte23 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2023Every severe thunderstorm warning 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.