Alert archive / South Dakota / Special Weather Statements in 2021

Special Weather Statement, NWS Rapid City, SD

May 23, 2021Pennington County, South Dakota

NWS Rapid City, SD issued this special weather statement at May 23, 2021, 2:16 PM MDT for Pennington County, South Dakota. 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 outline as issued.

The facts

Issued: May 23, 2021, 2:16 PM MDT (20:16 UTC)
Expired: May 23, 2021, 2:45 PM MDT
In force: 29 min
Issued by: NWS Rapid City, SD

County Pennington County, SD

The radar

The Rapid City radar (KUDX), 22 km from the middle of the area, began a volume at 20:19 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 text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, 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 this special weather statement went out at May 23, 2:11 PM MDT, 5 minutes earlier.

Area forecast discussion, May 23, 2:11 PM MDT, 5 minutes before

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
211 PM MDT Sun May 23 2021

.DISCUSSION...(This Evening Through Sunday)
Issued at 123 PM MDT Sun May 23 2021

20Z analysis shows a surface low near the Bighorns in
northeastern Wyoming with another low pressure center over
northeastern Colorado. A surface trough/warm front extends
northeastward from that low into western South Dakota, currently
extending roughly from Custer to Rapid City to Faith. Extensive
low stratus and cooler temperatures remain in place to the
northwest of the front in South Dakota, with much warmer
temperatures and greater surface based instability to the
southeast of the front. Expect to see the front push a little
farther to the northwest this afternoon.

Upper low over southwestern Montana will swing a shortwave trough
across the region, increasing synoptic scale lift and coverage of
showers and thunderstorms during the rest of the afternoon and
evening. SBCAPE has risen to 1000-2000J/KG in the warm sector to
the south of the front and 0-6km bulk shear has increased to
40-60kts. Low LCL heights and SRH values in the range of
200-300m2/s2 exist along and to the north of the front,
particularly in northwestern South Dakota. Convective mode may
later transition from discrete storms with large hail and possible
tornadoes to a squall line/bow echo complex with the potential
for significant damaging winds and large hail.

Monday will be windy and drier with 30kt west/southwest boundary
layer flow. High temperatures will be mainly in the 70s.

Rest of week looks like typical late May weather. Showers/storms
possible mid-week and then next weekend as a couple of
disturbances move along the US/Canadian border.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Monday)
Issued At 1110 AM MDT Sun May 23 2021

MVFR/IFR/LIFR conditions in low clouds/fog are expected to improve
early this afternoon. Then a round of showers/storms will develop
across northeastern WY and much of western SD. This activity will
evolve into a line of strong to severe storms, with damaging
winds, large hail, and tornadoes possible. MVFR conditions will be
possible in showers/storms. Behind the storms, conditions will
improve to VFR overnight. Southwesterly winds will become breezy
Monday morning.

&&

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

DISCUSSION...10
AVIATION...Pojorlie

Hazardous weather outlook, May 23, 9:26 AM MDT, 4 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Rapid City SD
926 AM MDT Sun May 23 2021

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-241300-
Harding-Perkins-Butte-Northern Meade Co Plains-Ziebach-
Northern Black Hills-Northern Foot Hills-Rapid City-
Southern Foot Hills-Central Black Hills-Southern Black Hills-
Custer Co Plains-Pennington Co Plains-Haakon-Fall River-
Oglala Lakota-Jackson-Bennett-Mellette-Todd-Tripp-
Sturgis/Piedmont Foot Hills-Southern Meade Co Plains-
Hermosa Foot Hills-Northern Campbell-Southern Campbell-
Western Crook-Wyoming Black Hills-Weston-Northeastern Crook-
926 AM MDT Sun May 23 2021 /1026 AM CDT Sun May 23 2021/

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

.DAY ONE...Today and Tonight

Numerous to widespread strong to severe thunderstorms are
expected this afternoon and evening. Storms will develop over
northeastern WY and western SD in the early afternoon, then shift
northward and eastward through the afternoon and evening. Damaging
straight-line winds, large hail, and tornadoes will all be
possible, especially over western SD. Storms will move into
central SD late this evening.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Chances for thunderstorms return on Wednesday, but widespread
severe weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Monitor NOAA Weather Radio for the latest information, forecasts,
and warnings.

In the hours before

Special weather statement, May 23, 1:40 PM MDT, 36 minutes before

Special Weather Statement
National Weather Service Rapid City SD
140 PM MDT Sun May 23 2021

SDZ027-029-041-074-232015-
Fall River SD-Hermosa Foot Hills SD-Southern Foot Hills SD-
Southern Black Hills SD-
140 PM MDT Sun May 23 2021

...STRONG THUNDERSTORM OVER SOUTH CENTRAL CUSTER AND NORTH CENTRAL
FALL RIVER COUNTIES...

At 140 PM MDT, Doppler radar was tracking a strong thunderstorm 3
miles southeast of Cascade Falls, or 9 miles south of Hot Springs,
moving north at 40 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Hot Springs, southern Wind Cave National Park, Cottonwood Springs
Dam, Cascade Falls, Maverick Junction, Cold Brook Reservoir and
Angostura Reservoir.

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.

&&

LAT...LON 4321 10343 4321 10362 4359 10364 4360 10329
TIME...MOT...LOC 1940Z 181DEG 36KT 4330 10350

Eagan

Special weather statement, May 23, 2:00 PM MDT, 16 minutes before

Special Weather Statement
National Weather Service Rapid City SD
200 PM MDT Sun May 23 2021

SDZ026-028-029-074-232030-
Hermosa Foot Hills SD-Central Black Hills SD-Southern Black Hills SD-
Rapid City SD-
200 PM MDT Sun May 23 2021

...STRONG THUNDERSTORM OVER NORTH CENTRAL CUSTER AND SOUTH CENTRAL
PENNINGTON COUNTIES...

At 159 PM MDT, Doppler radar was tracking a strong thunderstorm over
eastern Custer State Park, or 11 miles east of Custer, moving north
at 40 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Southwestern Rapid City, Keystone, Hisega, Hayward, Rockerville,
Mount Rushmore National Memorial, Keystone Wye, Bear Country, Hart
Ranch, Legion Lake, State Game Lodge, Center Lake, Custer State Park,
Black Gap, Reptile Gardens, Black Hills Playhouse and Sheridan Lake.

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.

&&

A Tornado Watch remains in effect until 900 PM MDT for southwestern
and west central South Dakota.

LAT...LON 4371 10348 4407 10346 4401 10311 4400 10310
      4368 10333
TIME...MOT...LOC 1959Z 190DEG 37KT 4376 10337

Eagan

Special weather statement, May 23, 2:02 PM MDT, 14 minutes before

Special Weather Statement
National Weather Service Rapid City SD
202 PM MDT Sun May 23 2021

SDZ013-031-073-232030-
Pennington Co Plains SD-Southern Meade Co Plains SD-
Northern Meade Co Plains SD-
202 PM MDT Sun May 23 2021

...STRONG THUNDERSTORM OVER SOUTHEASTERN MEADE AND NORTHEASTERN
PENNINGTON COUNTIES...

At 201 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles north of Creighton, or 37 miles northwest of Philip, moving
north at 45 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Plainview and Marcus.

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.

&&

A Tornado Watch remains in effect until 900 PM MDT for west central
South Dakota.

LAT...LON 4430 10218 4431 10236 4471 10241 4470 10204
TIME...MOT...LOC 2001Z 179DEG 41KT 4438 10226

Eagan

Special weather statement, May 23, 2:16 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Rapid City SD
216 PM MDT Sun May 23 2021

SDZ026-031-073-232045-
Pennington Co Plains SD-Southern Meade Co Plains SD-Rapid City SD-
216 PM MDT Sun May 23 2021

...STRONG THUNDERSTORM OVER SOUTH CENTRAL MEADE AND CENTRAL
PENNINGTON COUNTIES...

At 216 PM MDT, Doppler radar was tracking a strong thunderstorm 3
miles southeast of Box Elder, or 9 miles east of Rapid City, moving
north at 45 mph.

Pea to dime size hail and winds in excess of 40 mph will be possible
with this storm.

Locations impacted include...
Eastern Rapid Valley, Ellsworth Air Force Base, Box Elder, Hereford
and Rapid City Airport.

This includes Interstate 90 in South Dakota between Mile Markers 63
and 71.

A Tornado Watch remains in effect until 900 PM MDT for west central
South Dakota.

LAT...LON 4414 10314 4415 10312 4417 10314 4440 10319
      4440 10287 4401 10301 4401 10311
TIME...MOT...LOC 2016Z 179DEG 39KT 4409 10304

Eagan

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 23, 3:20 AM MDT	Special Weather Statement	UNR	Oglala Lakota	40 min
May 23, 4:57 AM MDT	Special Weather Statement	UNR	Meade	33 min
May 23, 5:23 AM MDT	Special Weather Statement	UNR	Jackson	37 min
May 23, 1:40 PM MDT	Special Weather Statement	UNR	Fall River	35 min
May 23, 2:00 PM MDT	Special Weather Statement	UNR	Custer	30 min
May 23, 2:02 PM MDT	Special Weather Statement	UNR	Meade	28 min
May 23, 2:45 PM MDT	Tornado Warning	UNR	Meade	30 min
May 23, 3:13 PM MDT	Tornado Warning	UNR	Meade, Perkins	47 min
May 23, 3:34 PM MDT	Special Weather Statement	UNR	Fall River	26 min
May 23, 3:53 PM MDT	Severe Thunderstorm Warning	UNR	Custer	37 min
May 23, 3:58 PM MDT	Tornado Warning	UNR	Perkins	47 min
May 23, 3:59 PM MDT	Tornado Warning	UNR	Custer	31 min
May 23, 4:14 PM MDT	Tornado Warning	UNR	Custer, Pennington	13 min
May 23, 4:26 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Lawrence, Meade, Pennington	49 min
May 23, 4:26 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade, Pennington	33 min
May 23, 5:04 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade, Pennington	30 min
May 23, 5:35 PM MDT	Special Weather Statement	UNR	Perkins	40 min
May 23, 5:53 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Meade, Pennington, Ziebach	67 min

Nearby

Special Weather Statements in South Dakota, 2021 Every special weather statement in 2021

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.