Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 324, NWS Cheyenne, WY

July 30, 2023Converse County, Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 30, 2023, 4:59 PM MDT for Converse County, Niobrara County, Wyoming. It was in force for 46 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 30, 2023, 4:59 PM MDT (22:59 UTC)
Expired: Jul 30, 2023, 5:45 PM MDT
In force: 46 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Converse County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 208 km from the middle of the area, began a volume at 23:00 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.

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, 3:10 PM MDT, 1 hour 49 minutes earlier.

Area forecast discussion, Jul 30, 3:10 PM MDT, 1 hour 49 minutes before

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Hazardous weather outlook, Jul 30, 3:29 PM MDT, 1 hour 30 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 30, 2:34 PM MDT, 2 hours 25 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
234 PM MDT Sun Jul 30 2023

WYZ116-117-302100-
South Laramie Range WY-South Laramie Range Foothills WY-
234 PM MDT Sun Jul 30 2023

...A strong thunderstorm will impact portions of southeastern Albany
and southwestern Laramie Counties through 300 PM MDT...

At 234 PM MDT, Doppler radar was tracking a strong thunderstorm near
Virginia Dale, or 25 miles southeast of Laramie, moving northeast at
15 mph.

HAZARD...Winds in excess of 40 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.

This storm will remain over mainly rural areas of southeastern Albany
and southwestern Laramie Counties.

This includes Interstate 80 in Wyoming between mile markers 339 and
351.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4104 10536 4120 10511 4109 10498 4100 10498
      4100 10534
TIME...MOT...LOC 2034Z 244DEG 13KT 4102 10527

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Hammer

Special weather statement, Jul 30, 3:03 PM MDT, 1 hour 56 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
303 PM MDT Sun Jul 30 2023

WYZ116>118-302130-
South Laramie Range WY-Central Laramie County WY-
South Laramie Range Foothills WY-
303 PM MDT Sun Jul 30 2023

...A strong thunderstorm will impact portions of southeastern Albany
and southwestern Laramie Counties through 330 PM MDT...

At 302 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles west of Warren AFB, or 12 miles west of Cheyenne, moving east
at 10 mph.

HAZARD...Wind gusts up to 50 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...
Crystal Lake Reservoir, Granite Springs Reservoir, Federal, Crystal
Lake Campground, Granite Springs Campground and Buford.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 1 and 5.
 Interstate 80 in Wyoming between mile markers 335 and 357.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4100 10517 4109 10531 4121 10531 4131 10497
      4100 10484
TIME...MOT...LOC 2102Z 247DEG 10KT 4110 10502

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

Hammer

Special weather statement, Jul 30, 3:28 PM MDT, 1 hour 31 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
328 PM MDT Sun Jul 30 2023

WYZ117-302200-
South Laramie Range Foothills WY-
328 PM MDT Sun Jul 30 2023

...A strong thunderstorm will impact portions of northwestern Laramie
County through 400 PM MDT...

At 328 PM MDT, Doppler radar was tracking a strong thunderstorm near
Horse Creek, or 24 miles northwest of Cheyenne. This storm was nearly
stationary.

HAZARD...Winds in excess of 40 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.

This storm will remain over mainly rural areas of northwestern
Laramie County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4131 10510 4144 10520 4158 10500 4133 10488
TIME...MOT...LOC 2128Z 228DEG 3KT 4142 10510

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Hammer

Special weather statement, Jul 30, 3:31 PM MDT, 1 hour 28 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
331 PM MDT Sun Jul 30 2023

WYZ116>118-302200-
South Laramie Range WY-Central Laramie County WY-
South Laramie Range Foothills WY-
331 PM MDT Sun Jul 30 2023

...A strong thunderstorm will impact portions of southwestern Laramie
County through 400 PM MDT...

At 331 PM MDT, Doppler radar was tracking a strong thunderstorm near
Crystal Lake Reservoir, or 14 miles west of Cheyenne, moving east at
10 mph.

HAZARD...Winds in excess of 40 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...
Federal, Warren Af Base, Warren AFB and Ranchettes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4111 10512 4124 10520 4135 10501 4126 10485
      4115 10485
TIME...MOT...LOC 2131Z 260DEG 8KT 4116 10508

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Hammer

Special weather statement, Jul 30, 3:58 PM MDT, 1 hour 1 minute before

Special Weather Statement
National Weather Service Cheyenne WY
358 PM MDT Sun Jul 30 2023

WYZ102-302230-
Niobrara County WY-
358 PM MDT Sun Jul 30 2023

...A strong thunderstorm will impact portions of southwestern
Niobrara County through 430 PM MDT...

At 358 PM MDT, Doppler radar was tracking a strong thunderstorm over
Keeline, or 17 miles west of Lusk, moving east at 20 mph.

HAZARD...Winds in excess of 40 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...
Manville and Keeline.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4266 10487 4280 10488 4290 10451 4262 10447
TIME...MOT...LOC 2158Z 257DEG 17KT 4273 10479

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Hammer

Special weather statement, Jul 30, 4:51 PM MDT, 8 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
451 PM MDT Sun Jul 30 2023

WYZ106>108-302315-
East Platte County WY-
Central Laramie Range and Southwest Platte County WY-
Goshen County WY-
451 PM MDT Sun Jul 30 2023

...A strong thunderstorm will impact portions of southwestern Goshen
and southeastern Platte Counties through 515 PM MDT...

At 451 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles southeast of Chugcreek, or 10 miles east of Wheatland, moving
northeast at 25 mph.

HAZARD...Winds in excess of 40 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...
Guernsey, Fort Laramie, Slater, Grayrocks Reservoir, Veteran and Fort
Laramie National Historic Site.

This includes Interstate 25 in Wyoming between mile markers 60 and
64.

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.

&&

LAT...LON 4183 10486 4198 10489 4229 10480 4229 10450
      4191 10435 4168 10447
TIME...MOT...LOC 2251Z 223DEG 24KT 4200 10476

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:24 PM MDT	Special Weather Statement	CYS	Converse	36 min
Jul 30, 2:34 PM MDT	Special Weather Statement	CYS	Laramie	26 min
Jul 30, 3:03 PM MDT	Special Weather Statement	CYS	Laramie	27 min
Jul 30, 3:28 PM MDT	Special Weather Statement	CYS	Laramie	32 min
Jul 30, 3:31 PM MDT	Special Weather Statement	CYS	Laramie	29 min
Jul 30, 3:58 PM MDT	Special Weather Statement	CYS	Niobrara	32 min
Jul 30, 4:01 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	17 min
Jul 30, 4:51 PM MDT	Special Weather Statement	CYS	Goshen	24 min
Jul 30, 5:29 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Niobrara	28 min
Jul 30, 5:47 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	43 min

Nearby

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; radar from the NEXRAD Level II archive.