Alert archive / Nebraska / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 240, NWS Cheyenne, WY

July 6, 2023Goshen County, Wyoming; Scotts Bluff County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 6, 2023, 11:20 PM MDT for Goshen County, Wyoming; Scotts Bluff County, Sioux County, Nebraska. It was in force for 40 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 6, 2023, 11:20 PM MDT (05:20 UTC)
Expired: Jul 7, 2023, 12:00 AM MDT
In force: 40 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 132 km from the middle of the area, began a volume at 05:21 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
Jul 6, 9:01 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 5.3 hours before the alert went out and 231 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: 1002 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1257 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

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 6, 11:12 PM MDT, 8 minutes earlier.

Area forecast discussion, Jul 6, 11:12 PM MDT, 8 minutes before

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Hazardous weather outlook, Jul 6, 2:04 PM MDT, 9 hours 16 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
204 PM MDT Thu Jul 6 2023

NEZ002-003-019>021-054-055-095-096-WYZ101-102-107-108-118-119-
072015-
Dawes County-Box Butte County-Scotts Bluff County-Banner County-
Morrill County-Kimball County-Cheyenne County-
Northern Sioux County-Southern Sioux County-
Converse County Lower Elevations-Niobrara County-
East Platte County-Goshen County-Central Laramie County-
East Laramie County-
204 PM MDT Thu Jul 6 2023

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

Slight Risk for severe thunderstorms this afternoon and overnight.
Large hail, strong wind gusts, and a tornado is possible.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Continued thunderstorm chances through the weekend. Warmer and
drier early next week possible.

.Spotter information statement...

Due to the potential for strong to severe thunderstorms across the
area today, spotters are encouraged to report any hail, wind, or
tornadoes to the National Weather Service.

WYZ103>106-109>117-072015-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte 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-
204 PM MDT Thu Jul 6 2023

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

Near daily chances for afternoon showers and thunderstorms. Some
may be strong to severe.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Near daily chances for afternoon showers and thunderstorms. Some
may be strong to severe.

.Spotter information statement...

Due to the potential for strong to severe thunderstorms across the
area today, spotters are encouraged to report any hail, wind, or
tornadoes to the National Weather Service.

In the hours before

Local storm report, Jul 6, 9:33 PM MDT, 1 hour 47 minutes before

Preliminary Local Storm Report
National Weather Service Cheyenne WY
933 PM MDT Thu Jul 6 2023

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

0920 PM     Hail             4 NNE Lusk              42.82N 104.42W
07/06/2023  E1.00 inch       Niobrara           WY   Emergency Mngr

            Quarter size hail between MM153 and MM155.

&&

MRD

Local storm report, Jul 6, 9:38 PM MDT, 1 hour 42 minutes before

Preliminary Local Storm Report
National Weather Service Cheyenne WY
938 PM MDT Thu Jul 6 2023

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

0935 PM     Hail             7 ESE LUSK              42.71N 104.77W
07/06/2023  E1.25 inch       Niobrara           WY   Public

            75 mph winds and half dollar size hail.

&&

MRD

Local storm report, Jul 6, 9:43 PM MDT, 1 hour 37 minutes before

Preliminary Local Storm Report
National Weather Service Cheyenne WY
943 PM MDT Thu Jul 6 2023

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

0920 PM     Tstm Wnd Gst     7 ESE Lusk              42.71N 104.76W
07/06/2023  E75 MPH          Niobrara           WY   Public

&&

MRD

Local storm report, Jul 6, 9:50 PM MDT, 1 hour 30 minutes before

Preliminary Local Storm Report
National Weather Service Cheyenne WY
950 PM MDT Thu Jul 6 2023

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

0925 PM     Hail             2 N Lusk                42.79N 104.45W
07/06/2023  E1.75 inch       Niobrara           WY   Public

&&

MRD

Local storm report, Jul 6, 10:23 PM MDT, 57 minutes before

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Local storm report, Jul 6, 11:02 PM MDT, 18 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
Jul 6, 6:45 PM MDT	Special Weather Statement	CYS	Converse	45 min
Jul 6, 6:57 PM MDT	Severe Thunderstorm Warning	CYS	Converse	48 min
Jul 6, 7:34 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	41 min
Jul 6, 8:09 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse, Niobrara	51 min
Jul 6, 8:41 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	49 min
Jul 6, 8:46 PM MDT	Severe Thunderstorm Warning	CYS	Converse	44 min
Jul 6, 8:47 PM MDT	Tornado Warning	CYS	Niobrara	28 min
Jul 6, 9:08 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	37 min
Jul 6, 9:37 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Niobrara	38 min
Jul 6, 9:46 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse, Platte	44 min
Jul 6, 10:11 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Niobrara	49 min
Jul 6, 10:18 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	24 min
Jul 6, 10:42 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Goshen, Niobrara, Platte	48 min
Jul 6, 10:57 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Box Butte, Scotts Bluff, Sioux	63 min
Jul 6, 11:57 PM MDT	Special Weather Statement	CYS	Box Butte	33 min
Jul 6, 11:59 PM MDT	Special Weather Statement	CYS	Scotts Bluff	31 min
Jul 7, 12:14 AM MDT	Severe Thunderstorm Warning	CYS	Morrill, Scotts Bluff, Sioux	31 min
Jul 7, 12:30 AM MDT	Special Weather Statement	CYS	Box Butte	30 min
Jul 7, 12:48 AM MDT	Special Weather Statement	CYS	Morrill	57 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2023 Severe Thunderstorm Warnings in Wyoming, 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.