Alert archive / Nebraska / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 364, NWS Cheyenne, WY

August 8, 2023Cheyenne County, Morrill County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 8, 2023, 5:01 PM MDT for Cheyenne County, Morrill County, Nebraska. It was in force for 29 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, 5:01 PM MDT (23:01 UTC)
Expired: Aug 8, 2023, 5:30 PM MDT
In force: 29 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cheyenne County, NE, Morrill County, NE

The radar

The Cheyenne radar (KCYS), 155 km from the middle of the area, began a volume at 23:03 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.

Issued	Product	Office	Lasted
Aug 8, 2:37 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.0 hours before the alert went out and 204 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: 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, 1 hour 30 minutes earlier.

Area forecast discussion, Aug 8, 3:31 PM MDT, 1 hour 30 minutes before

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Hazardous weather outlook, Aug 8, 2:53 PM MDT, 2 hours 8 minutes before

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In the hours before

Special weather statement, Aug 8, 3:10 PM MDT, 1 hour 51 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, 1 hour 25 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

Local storm report, Aug 8, 4:04 PM MDT, 57 minutes before

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Special weather statement, Aug 8, 4:48 PM MDT, 13 minutes before

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Special weather statement, Aug 8, 4:52 PM MDT, 9 minutes before

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Local storm report, Aug 8, 4:53 PM MDT, 8 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
Aug 8, 2:38 PM MDT	Special Weather Statement	CYS	Laramie	22 min
Aug 8, 4:52 PM MDT	Special Weather Statement	CYS	Goshen	23 min
Aug 8, 5:39 PM MDT	Special Weather Statement	CYS	Platte	36 min
Aug 7, 6:03 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Dawes	42 min
Aug 7, 6:41 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Dawes	49 min
Aug 7, 6:51 PM MDT	Special Weather Statement	CYS	Box Butte	39 min
Aug 7, 7:16 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	44 min
Aug 8, 3:10 PM MDT	Special Weather Statement	CYS	Morrill	35 min
Aug 8, 3:20 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	40 min
Aug 8, 3:23 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	37 min
Aug 8, 3:36 PM MDT	Special Weather Statement	CYS	Kimball	24 min
Aug 8, 3:59 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Box Butte, Morrill	31 min
Aug 8, 4:29 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	46 min
Aug 8, 4:48 PM MDT	Special Weather Statement	CYS	Cheyenne	42 min
Aug 8, 5:22 PM MDT	Special Weather Statement	CYS	Box Butte	23 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2023 Every 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.