Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 236, NWS Cheyenne, WY

July 6, 2023Goshen County, Niobrara County, Wyoming; Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 6, 2023, 10:11 PM MDT for Goshen County, Niobrara County, Wyoming; Sioux County, Nebraska. It was in force for 49 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, 10:11 PM MDT (04:11 UTC)
Expired: Jul 6, 2023, 11:00 PM MDT
In force: 49 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 1.5 in
Wind: 70.0 mph

Counties Sioux County, NE, Goshen County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 163 km from the middle of the area, began a volume at 04:15 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

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, 9:47 PM MDT, 24 minutes earlier.

Area forecast discussion, Jul 6, 9:47 PM MDT, 24 minutes before

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In the hours before

Special weather statement, Jul 6, 6:45 PM MDT, 3 hours 26 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
645 PM MDT Thu Jul 6 2023

WYZ101-070130-
Converse County Lower Elevations WY-
645 PM MDT Thu Jul 6 2023

...A strong thunderstorm will impact portions of north central
Converse County through 730 PM MDT...

At 645 PM MDT, Doppler radar was tracking a strong thunderstorm 13
miles southeast of Pine Tree Junction, or 20 miles south of Wright,
moving east at 20 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.

This storm will remain over mainly rural areas of north central
Converse County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
east central Wyoming.

&&

LAT...LON 4326 10533 4334 10574 4350 10577 4350 10531
TIME...MOT...LOC 0045Z 287DEG 19KT 4347 10563

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

Natoli

Local storm report, Jul 6, 9:24 PM MDT, 47 minutes before

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Local storm report, Jul 6, 9:33 PM MDT, 38 minutes before

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Local storm report, Jul 6, 9:38 PM MDT, 33 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, 28 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, 21 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

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, 10:18 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, 11:20 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	40 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 Wyoming, 2023 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; radar from the NEXRAD Level II archive.