Thunderstorm Wind, Harding
- When
- July 20, 4:22 PM MST
- Where
- Harding County, 4 mi N of Ludlow
- Measured
- 54 kt (62 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 45.888, -103.380
Damaging Winds in South Dakota, July 20, 2017
A line of thunderstorms tracked across far northwestern South Dakota, producing wind gusts over 60 mph across parts of Harding and northern Perkins Counties.
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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 3
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 line of thunderstorms tracked across far northwestern South Dakota, producing wind gusts over 60 mph across parts of Harding and northern Perkins Counties.
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 20, 4:16 PM MST, 6 minutes earlier.
Area forecast discussion, Jul 20, 4:16 PM MST, 6 minutes before
Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
516 PM MDT Thu Jul 20 2017
.DISCUSSION...(This Evening Through Thursday)
Issued at 259 PM MDT Thu Jul 20 2017
Latest analysis shows low pressure centered over eastern Montana.
A warm front extends eastward from the low into northern North
Dakota and a dry line extends southward from the low into eastern
Wyoming. The dry line will push into western South Dakota this
evening followed by a weak cold front that will push southeastward
across the region overnight. Thunderstorms have already developed
in southeastern Montana and along the warm front in North Dakota.
Deep shear profiles and increasing instability this afternoon
point to the possibility of severe thunderstorms over parts of the
forecast area overnight. A severe thunderstorm watch has already
been issued for parts of far northwestern South Dakota, which need
to be extended farther south later this evening. The surface low
will be centered over south central South Dakota on Friday morning
so may see some storms linger over the eastern CWA during the
morning. Might see some breezy areas in the area of the tighter
sfc pressure gradient to the west of the low especially during the
morning. Drier air will flow into the region as high pressure
moves in behind the departing low.
Saturday through Thursday, a flat upper ridge on Saturday will
begins to amplify Sunday into early next week. Isolated -TSRA may
occur, but most areas will remain dry. Temperatures will be 5-10F
above average with perhaps Monday looking to be the warmest day.
&&
.AVIATION...(For the 00Z TAFS Through 00Z Friday Evening)
Issued At 513 PM MDT Thu Jul 20 2017
Thunderstorms currently over northeastern Wyoming and northwestern
South Dakota will continue to move southeastward across the rest
of western South Dakota tonight. Severe thunderstorms are possible
through this evening, with large hail and damaging wind gusts.
Outside of any thunderstorms, VFR conditions are expected.
&&
.FIRE WEATHER...
Issued at 259 PM MDT Thu Jul 20 2017
Drier air will push into the area Friday and Saturday with a few
breezy areas possible. Minimum RH will dip to 15-25% on Friday
afternoon.
&&
.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Heat Advisory from 11 AM MDT /noon CDT/ to 7 PM MDT /8 PM CDT/
Friday for SDZ032-043-046-047-049.
WY...None.
&&
DISCUSSION...10
AVIATION...10
FIRE WEATHER...10Hazardous weather outlook, Jul 20, 9:59 AM MST, 6 hours 23 minutes before
Hazardous Weather Outlook National Weather Service Rapid City SD 1059 AM MDT Thu Jul 20 2017 SDZ013-014-024>031-041-072>074-WYZ054>058-071-211300- 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-Fall River-Sturgis/Piedmont Foot Hills- Southern Meade Co Plains-Hermosa Foot Hills-Northern Campbell- Southern Campbell-Western Crook-Wyoming Black Hills-Weston- Northeastern Crook- 1059 AM MDT Thu Jul 20 2017 This Hazardous weather outlook is for portions of the Black Hills of South Dakota...western South Dakota...northeast Wyoming...and the Black Hills of Wyoming. .DAY ONE...Today and Tonight Isolated to scattered showers and thunderstorms will develop late this afternoon into this evening. Some of these storms will be strong to severe with large hail and damaging winds possible. .DAYS TWO THROUGH SEVEN...Friday through Wednesday After a quiet weekend, an active weather pattern will return early next week. .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 SDZ001-002-012-211300- Harding-Perkins-Butte- 1059 AM MDT Thu Jul 20 2017 This Hazardous weather outlook is for portions of western South Dakota. .DAY ONE...Today and Tonight Isolated to scattered showers and thunderstorms will develop late this afternoon into this evening. Some of these storms will be strong to severe with large hail and damaging winds possible. Additionally...the combination of very warm temperatures and breezy winds will push the grassland fire danger into the very high category today. .DAYS TWO THROUGH SEVEN...Friday through Wednesday After a quiet weekend, an active weather pattern will return early next week. .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 SDZ032-042>044-046-047-049-211300- Haakon-Oglala Lakota-Jackson-Bennett-Mellette-Todd-Tripp- 1059 AM MDT Thu Jul 20 2017 /1159 AM CDT Thu Jul 20 2017/ This Hazardous weather outlook is for portions of south central South Dakota...and western South Dakota. .DAY ONE...Today and Tonight Isolated to scattered showers and thunderstorms will move across the South Dakota plains this evening and overnight. A few storms will be strong to severe with large hail and damaging winds possible. .DAYS TWO THROUGH SEVEN...Friday through Wednesday After a quiet weekend, an active weather pattern will return early next week. .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
In the hours before
Local storm report, Jul 20, 4:20 PM MST, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
520 PM MDT THU JUL 20 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0505 PM TSTM WND GST 14 WNW LADNER 45.90N 104.00W
07/20/2017 E50 MPH HARDING SD TRAINED SPOTTER
&&
MESpecial weather statement, Jul 20, 4:22 PM MST, 0 minutes before
Special Weather Statement
National Weather Service Rapid City SD
522 PM MDT THU JUL 20 2017
SDZ001-202345-
Harding SD-
522 PM MDT THU JUL 20 2017
...STRONG THUNDERSTORM OVER SOUTHWESTERN HARDING COUNTY...
At 521 PM MDT, Doppler radar was tracking a strong thunderstorm over
Camp Crook, or 19 miles west of Buffalo, moving east at 35 mph.
Wind gusts of 50 to 55 mph will be possible with this storm.
Locations impacted include...
Harding, Camp Crook, East Short Pines, West Short Pines and Lake
Gardner.
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 severe thunderstorm watch remains in effect until 1000 PM MDT for
northwestern South Dakota.
LAT...LON 4562 10358 4535 10369 4541 10404 4565 10404
4570 10403
TIME...MOT...LOC 2321Z 277DEG 29KT 4556 10395
JCThe radar
The Rapid City radar (KUDX), 201 km away, was scanning. The volume nearest the first event began at 23:22 UTC.
Event by event
3 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Butte
- When
- July 20, 5:05 PM MST
- Where
- Butte County, 26.31 mi WNW of Castle Rock
- Measured
- 53 kt (61 mph) measured gust
- Reported by
- RAWS
- Coordinates
- 45.139, -103.913
Thunderstorm Wind, Perkins
- When
- July 20, 6:03 PM MST
- Where
- Perkins County, 7 mi S of Shadehill
- Measured
- 56 kt (64 mph) measured gust
- Reported by
- RAWS
- Coordinates
- 45.669, -102.180
What these are
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Heat in Nevada, July 20 to 24, 2017
- Tornadoes and Damaging Winds in New York, July 20, 2017
- Hail and Damaging Winds in North Dakota, July 20, 2017
- Flooding in Wisconsin, July 20 to 31, 2017
- Flash Flooding and Heavy Rain in Iowa, July 20 to 22, 2017
- Flash Flooding and Damaging Wind in Arizona, July 20 to 21, 2017
- Damaging Winds in New York, July 20, 2017
- Damaging Winds and Lightning Strike in Pennsylvania, July 20, 2017
- Flood and Damaging Winds in Florida, July 20, 2017
- Damaging Wind and Heavy Rain in Arizona, July 20, 2017
- Flash Flood in Colorado, July 20, 2017
- Flash Flooding in Pennsylvania, July 20, 2017
More
Every storm in South Dakota in 2017Every state in 2017This day in weather historyWarnings in South Dakota, July 2017
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: 704943, 717039, 704944.