Alert archive / Nebraska / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 332, NWS Cheyenne, WY

July 31, 2023Box Butte County, Morrill County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 31, 2023, 1:07 AM MDT for Box Butte County, Morrill County, Nebraska. It was in force for 35 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 31, 2023, 1:07 AM MDT (07:07 UTC)
Expired
Jul 31, 2023, 1:42 AM MDT
In force
35 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 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 07:08 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 00:00Z, 7.1 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 00:00Z on 2023-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3462 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 00:00Z on 2023-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
3462 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
1594 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
189 m²/s²
Significant tornado parameter
1.2
Supercell composite
16.6

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 Jul 30, 11:09 PM MDT, 1 hour 58 minutes earlier.

Area forecast discussion, Jul 30, 11:09 PM MDT, 1 hour 58 minutes before
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Hazardous weather outlook, Jul 30, 3:29 PM MDT, 9 hours 38 minutes before
Hazardous Weather Outlook
National Weather Service Cheyenne WY
329 PM MDT Sun Jul 30 2023

WYZ104-105-109>115-312130-
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-
329 PM MDT Sun Jul 30 2023

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

Scattered showers and thunderstorms are expected across the area
this afternoon. Gusty winds will be possible with storms.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

Daily chances for afternoon and evening thunderstorms will
continue for the week ahead. Confidence is increasing that a
significant push of monsoon moisture will arrive early next week,
bringing more widespread thunderstorms and heavy rainfall.

.Spotter information statement...

Spotter activation will not be needed.

NEZ019>021-054-055-WYZ101-103-106>108-116>119-312130-
Scotts Bluff County-Banner County-Morrill County-Kimball County-
Cheyenne County-Converse County Lower Elevations-
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-
329 PM MDT Sun Jul 30 2023

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

Scattered showers and thunderstorms are possible across the area
this afternoon and evening. A few storms may be strong to severe
with large hail possible.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

Daily chances for afternoon and evening thunderstorms will
continue for the week ahead. Confidence is increasing that a
significant push of monsoon moisture will arrive early next week,
bringing more widespread thunderstorms and heavy rainfall.

.Spotter information statement...

Spotters are encouraged to report severe weather to the NWS.

NEZ002-003-095-096-WYZ102-312130-
Dawes County-Box Butte County-Northern Sioux County-
Southern Sioux County-Niobrara County-
329 PM MDT Sun Jul 30 2023

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

Scattered showers and thunderstorms are possible across the area
this afternoon and evening. A few storms may be strong to severe
with large hail possible late in the afternoon. Another round of
storms is possible in the late evening hours with potentially
damaging winds and heavy rainfall.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

Daily chances for afternoon and evening thunderstorms will
continue for the week ahead. Confidence is increasing that a
significant push of monsoon moisture will arrive early next week,
bringing more widespread thunderstorms and heavy rainfall.

.Spotter information statement...

Spotters are encouraged to report severe weather to the NWS.

In the hours before

Special weather statement, Jul 31, 12:15 AM MDT, 52 minutes before
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Special weather statement, Jul 31, 12:56 AM MDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 6:30 PM MDTSevere Thunderstorm WarningCYSNiobrara14 min
Jul 30, 6:46 PM MDTSevere Thunderstorm WarningCYSNiobrara44 min
Jul 31, 3:31 AM MDTFlood WatchCYSAlbany, Carbon, Converse, Goshen, Laramie, Platte20 hr
Jul 31, 5:26 AM MDTDense Fog AdvisoryCYSAlbany, Laramie3 hr
Jul 31, 1:49 PM MDTFlood WatchCYSAlbany, Converse, Goshen, Laramie, Niobrara, Platte30 hr
Jul 31, 2:54 PM MDTSpecial Weather StatementCYSAlbany36 min
Jul 31, 3:16 PM MDTAreal Flood AdvisoryCYSAlbany3 hr
Jul 31, 4:14 PM MDTSpecial Weather StatementCYSAlbany31 min
Jul 31, 4:58 PM MDTSpecial Weather StatementCYSConverse47 min
Jul 30, 6:56 PM MDTSevere Thunderstorm WarningCYSDawes, Sioux34 min
Jul 30, 7:37 PM MDTSevere Thunderstorm Warning Considerable damage threatCYSMorrill53 min
Jul 30, 7:52 PM MDTSevere Thunderstorm WarningCYSBox Butte, Dawes, Morrill35 min
Jul 31, 12:15 AM MDTSpecial Weather StatementCYSBox Butte30 min
Jul 31, 12:56 AM MDTSpecial Weather StatementCYSMorrill34 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.