Hail in Wyoming, July 30, 2023

Name: Hail in Wyoming, July 30, 2023
Start: 2023-07-30T15:00
End: 2023-07-30T15:00
Location: Wyoming

July 30, 2023 · NWS UNR · 1 event in 1 county or zone

A thunderstorm briefly became severe over northeastern Campbell County, producing large hail north of Weston.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS UNR wrote it up.

A thunderstorm briefly became severe over northeastern Campbell County, producing large hail north of Weston.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Rapid City, SD wrote its last area forecast discussion before the first event at Jul 30, 2:03 PM MST, 57 minutes earlier.

Area forecast discussion, Jul 30, 2:03 PM MST, 57 minutes before

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
303 PM MDT Sun Jul 30 2023

.DISCUSSION...(This Evening Through Sunday)
Issued at 303 PM MDT Sun Jul 30 2023

Current surface analysis shows frontal boundary just to the west
and southwest of the forecast area, with southeasterly low level
winds continuing to bring increasing moisture over much of the
forecast area. A couple of weaker surface boundaries are noted
across the Black Hills area as well. Dewpoints range from the 50s
over northeast WY and the higher Black Hills to 60s to around 70
degrees elsewhere. Upper level analysis shows ridge axis over WY
and central MT, with weak disturbances passing through the ridge.
One disturbance is located over western into central SD, with a
stronger one moving across south central MT/northern WY. Regional
radars are showing isolated/scattered storms now over WY into far
western SD. A severe storm has pushed through portions of the
northern/central Black Hills this afternoon. Temps are in the 80s
to lower 90s, cooler where rain has fallen, with muggy conditions
across the SD plains.

Isolated/widely scattered storms, possibly strong to severe, will
continue to affect the Black Hills area and parts of northwest/west
central SD into the late afternoon, as the first disturbance slides
through western SD. MLCAPE of 1500 to over 3000 j/kg has developed
this afternoon over much of the area. Shear remains quite favorable
for supercells and organized multicells through the evening. Large
hail, possibly very large hail, and strong wind gusts will be the
main threats from any severe storms. The second disturbance further
west is expected to bring more widespread showers and storms from
west to east late today and into tonight. Large hail and strong wind
gusts will be the main threats as well, but wind could become the
bigger threat as the evening goes on, as storms could organize into
one or two lines during the evening. With precipitable water values
well above average, at least locally heavy rain can be expected,
though movement of storms should be relatively fast with that round
of storms. However, will have to watch for any training of storms
this afternoon into tonight for potential localized flooding.

Storms could linger much of the night and possibly into Monday
morning over eastern portions of the forecast area, especially
toward central SD, though the threat for severe storms will drop off
into the overnight hours. Warm and relatively humid conditions will
persist for the first half of the week, with highs mostly in the 80s
and lower 90s and dewpoints remaining in the upper 50s to near 70.
Chances for storms should lessen some, along with the threat for
severe storms, as available CAPE gradually drops off and shear
weakens considerably by Tuesday. However, weak ridge rider
disturbances could bring isolated to scattered storms at times into
midweek. The risk for severe storms could increase toward the
Thursday/Friday period as ridge eventually shifts east of the region
and a more southwesterly flow regime aloft sets up from the Rockies
into the Plains. Chances for showers and storms will likely persist
through the extended period, with active flow and monsoonal moisture
across the Rockies into the high Plains. This could lead to a
relatively wet pattern. Temps will also drop off to below average
levels late week and especially over the weekend.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Monday)
Issued At 1122 AM MDT Sun Jul 30 2023

The next round of storms are expected to cross the area sometime
this afternoon through this evening. These storms will likely be
strong to severe, with large hail, strong wind gusts, and brief
MVFR/IFR conditions. Have added tempo groups to the terminals
given high storm probs. In addition, wake low winds are a
possibility on the backside of a potential MCS, with near severe
gusts possible in the lee of the Black Hills.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

DISCUSSION...26
AVIATION...JC

Hazardous weather outlook, Jul 30, 9:47 AM MST, 5 hours 13 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Rapid City SD
1047 AM MDT Sun Jul 30 2023

SDZ001-002-014-032-043-044-046-047-049-311300-
Harding-Perkins-Ziebach-Haakon-Jackson-Bennett-Mellette-Todd-
Tripp-
1047 AM MDT Sun Jul 30 2023 /1147 AM CDT Sun Jul 30 2023/

This Hazardous Weather Outlook is for portions of western South
Dakota.

.DAY ONE...Today and Tonight

There is a slight risk (level 2 of 5) of severe thunderstorms
late this afternoon and evening, meaning that scattered severe
storms are possible. Primary hazards include large hail and
damaging winds. Storms are expected to develop later this
afternoon and evening and possibly linger overnight.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

There is a daily chance of thunderstorms through the first half
of the week. Some storms may be strong or severe on Monday, with
hail and strong winds the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

SDZ012-013-024>031-041-042-072>074-WYZ054>058-071-311300-
Butte-Northern Meade Co Plains-Northern Black Hills-
Northern Foot Hills-Rapid City-Southern Foot Hills-
Central Black Hills-Southern Black Hills-Custer Co Plains-
Pennington Co Plains-Fall River-Oglala Lakota-
Sturgis/Piedmont Foot Hills-Southern Meade Co Plains-
Hermosa Foot Hills-Northern Campbell-Southern Campbell-
Western Crook-Wyoming Black Hills-Weston-Northeastern Crook-
1047 AM MDT Sun Jul 30 2023

This Hazardous Weather Outlook is for portions of western South
Dakota and northeastern Wyoming.

.DAY ONE...Today and Tonight

There is an enhanced risk (level 3 of 5) of severe thunderstorms
today, meaning that numerous severe storms are possible. Primary
hazards include very large hail (greater than 2 inches) and
damaging winds. Storms are expected to develop this afternoon and
evening.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

There is a daily chance of thunderstorms through the first half
of the week. Some storms may be strong or severe on Monday, with
hail and strong winds the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

In the hours before

Local storm report, Jul 30, 1:27 PM MST, 1 hour 33 minutes before

Preliminary Local Storm Report
National Weather Service Rapid City SD
227 PM MDT Sun Jul 30 2023

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

0224 PM     Hail             1 SW Rockerville        43.95N 103.37W
07/30/2023  E1.00 inch       Pennington         SD   Public

            mPING report

&&

JC

Local storm report, Jul 30, 1:50 PM MST, 1 hour 10 minutes before

Preliminary Local Storm Report
National Weather Service Rapid City SD
250 PM MDT Sun Jul 30 2023

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

0210 PM     Hail             1 NNW Sheridan Lake     43.98N 103.47W
07/30/2023  E2.50 inch       Pennington         SD   Trained Spotter

&&

JC

Local storm report, Jul 30, 1:51 PM MST, 1 hour 9 minutes before

Preliminary Local Storm Report
National Weather Service Rapid City SD
251 PM MDT Sun Jul 30 2023

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

0155 PM     Hail             Johnson Siding          44.08N 103.44W
07/30/2023  M1.50 inch       Pennington         SD   Public

&&

WFO UNR

Local storm report, Jul 30, 1:54 PM MST, 1 hour 6 minutes before

Preliminary Local Storm Report
National Weather Service Rapid City SD
254 PM MDT Sun Jul 30 2023

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

0202 PM     Hail             2 S Pactola Resv        44.04N 103.50W
07/30/2023  E2.50 inch       Pennington         SD   NWS Employee

&&

JC

Special weather statement, Jul 30, 2:05 PM MST, 55 minutes before

Special Weather Statement
National Weather Service Rapid City SD
305 PM MDT Sun Jul 30 2023

WYZ054-302130-
Northern Campbell WY-
305 PM MDT Sun Jul 30 2023

...A strong thunderstorm will impact portions of north central
Campbell County through 330 PM MDT...

At 305 PM MDT, Doppler radar was tracking a strong thunderstorm 5
miles east of Recluse, or 32 miles north of Gillette, moving east at
25 mph.

HAZARD...Penny size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

This storm will remain over mainly rural areas of north central
Campbell County, east of Spotted Horse.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northeastern Wyoming.

&&

LAT...LON 4464 10569 4482 10571 4482 10542 4465 10536
TIME...MOT...LOC 2105Z 264DEG 20KT 4474 10560

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...<30 MPH

JC

Local storm report, Jul 30, 2:10 PM MST, 50 minutes before

Preliminary Local Storm Report
National Weather Service Rapid City SD
310 PM MDT Sun Jul 30 2023

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

0200 PM     Hail             1 SSE Pactola Resv      44.05N 103.49W
07/30/2023  M3.00 inch       Pennington         SD   Public

&&

JC

The radar

The Rapid City radar (KUDX), 210 km away, was scanning. The volume nearest the first event began at 21:58 UTC.

Open the radar archive at this moment

Event by event

1 hail. Local standard time, as filed.

Hail, Campbell

When: July 30, 3:00 PM MST
Where: Campbell County, 4 mi NNW of Weston
Measured: 1 in hail
Reported by: Public
Coordinates: 44.684, -105.361

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Wyoming in 2023 Every state in 2023 This day in weather history Warnings in Wyoming, July 2023

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1114668.