Runoff from rounds of heavy rainfall during the previous evening caused flash flooding around Wewela.
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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.
The episode as NWS UNR wrote it up.
Runoff from rounds of heavy rainfall during the previous evening caused flash flooding around Wewela.
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 Aug 9, 11:24 PM CST, 1 hour 6 minutes earlier.
Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 1124 PM MDT Fri Aug 9 2019 .DISCUSSION...(This Evening Through Friday) Issued at 139 PM MDT Fri Aug 9 2019 Upper level analysis shows a broad ridge over much of the CONUS, along with embedded shortwaves. One shortwave is resulting in some storms over central SD early this afternoon. At the surface, a trough is pushing into the western Dakotas, with the low over SW SD, creating southerly winds across central SD. Under partly cloudy skies, temperatures across the CWA are rising into the 80s, with dew points ranging from the mid 50s across the west to mid to upper 60s farther east. By mid-afternoon, models are showing around 2000 J/kg MLCAPE across western and central SD, mainly ahead of the surface low. CAMs show storms mainly across central and eastern SD this afternoon and evening, supported by some upper-level divergence, but storms outside of that area (especially around the Black Hills) aren't out of the question. With 0-6 km shear around 40 kts, any of these storms have the potential to become severe. Furthermore, low-level CAPE, shear, helicity, along with LCLs around 500 m indicate the possibility for tornadoes across central SD. PWATs of 150 to 200% of normal across central SD, where rain fell this morning, increases the concern for flash flooding; however, storms should keep moving and not linger over one place for too long. The threat for severe weather across our CWA is expected to diminish early this evening. Light winds and lingering moisture will allow fog to develop tonight across the western SD plains, continuing into Saturday morning. Lows will be in the 60s. Another shortwave will push into the region Saturday afternoon, bringing the next round of thunderstorms. CAMs are not in agreement on storm coverage or timing, but they generally show storms developing across northeastern WY mid-afternoon, spreading into western SD early Saturday evening. Instability will be weaker than that of today, but with the shear will still be sufficient for a few strong to severe storms. The threat for tornadoes looks low. Highs Saturday will be in the 80s, with lows in the lower 60s. Fog could redevelop across the SD plains early Sunday morning. An upper low over the Pacific NW Sunday morning will transition to an open wave as it pushes over the northern Rockies and into the northern plains Sunday afternoon, flattening the ridge. This will bring strong upper-level energy to the region, along with low-level frontogenesis. Plenty of instability and shear will allow for severe thunderstorms, along with the potential for tornadoes. Upper flow next week will be more zonal, with periodic shortwaves passing through. Cooler air will filter into the region behind Sunday's system, resulting in highs in the 70s to lower 80s for early next week. Generally drier weather can be expected, with chances for occasional storms. && .AVIATION...(For the 06Z TAFS Through 06Z Saturday Night) Issued At 1121 PM MDT Fri Aug 9 2019 Areas of MVFR/IFR stratus and fog will spread across western South Dakota overnight. Ceilings will improve to VFR Saturday morning. Saturday afternoon and evening, another round of storms will move into northeastern Wyoming and western South Dakota. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...None. WY...None. && DISCUSSION...Pojorlie AVIATION...7
Hazardous Weather Outlook National Weather Service Rapid City SD 816 PM MDT Fri Aug 9 2019 SDZ044-046-047-049-101300- Bennett-Mellette-Todd-Tripp- 816 PM MDT Fri Aug 9 2019 /916 PM CDT Fri Aug 9 2019/ This Hazardous Weather Outlook is for portions of south central South Dakota...and southwestern South Dakota. .DAY ONE...Tonight Scattered thunderstorms will end late this evening. Locally heavy rain and flooding are possible from the thunderstorms. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Isolated to scattered thunderstorms are expected Saturday and Sunday afternoon and evening. Isolated severe storms are possible Saturday afternoon and evening. There is a slight risk of severe storms Sunday afternoon and evening. Large hail and damaging winds will be the main threat. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity SDZ001-012-025-WYZ071-101300- Harding-Butte-Northern Foot Hills-Northeastern Crook- 816 PM MDT Fri Aug 9 2019 This Hazardous Weather Outlook is for portions of northwestern South Dakota...and northeast Wyoming. .DAY ONE...Tonight Isolated thunderstorms are possible this evening. Severe thunderstorms are not expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Isolated to scattered thunderstorms are expected Saturday and Sunday afternoon and evening. Isolated severe storms are possible Saturday afternoon and evening. There is a slight risk of severe storms Sunday afternoon and evening. Large hail and damaging winds will be the main threat. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity SDZ002-013-014-024-026>032-041>043-072>074-WYZ054>058-101300- Perkins-Northern Meade Co Plains-Ziebach-Northern Black Hills- Rapid City-Southern Foot Hills-Central Black Hills- Southern Black Hills-Custer Co Plains-Pennington Co Plains-Haakon- Fall River-Oglala Lakota-Jackson-Sturgis/Piedmont Foot Hills- Southern Meade Co Plains-Hermosa Foot Hills-Northern Campbell- Southern Campbell-Western Crook-Wyoming Black Hills-Weston- 816 PM MDT Fri Aug 9 2019 This Hazardous Weather Outlook is for portions of northwestern South Dakota...southwestern South Dakota...the Black Hills of South Dakota...northeast Wyoming...and the Black Hills of Wyoming. .DAY ONE...Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Isolated to scattered thunderstorms are expected Saturday and Sunday afternoon and evening. Isolated severe storms are possible Saturday afternoon and evening. There is a slight risk of severe storms Sunday afternoon and evening. Large hail and damaging winds will be the main threat. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
637 PM MDT FRI AUG 09 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0630 PM TSTM WND GST 5 E POTATO CREEK 43.53N 101.89W
08/09/2019 E60 MPH JACKSON SD PUBLIC
0630 PM HAIL 5 E POTATO CREEK 43.53N 101.89W
08/09/2019 E0.88 INCH JACKSON SD PUBLIC
&&
MESpecial Weather Statement National Weather Service Rapid City SD 744 PM CDT Fri Aug 9 2019 SDZ049-100130- Tripp SD- 744 PM CDT Fri Aug 9 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN TRIPP COUNTY UNTIL 830 PM CDT... At 744 PM CDT, Doppler radar was tracking a strong thunderstorm near Dog Ear Lake, or 11 miles south of Winner, moving southeast at 15 mph. Half inch hail and wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Colome, Millboro, Keyapaha, Clearfield, Wewela and Dog Ear Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && A Tornado Watch remains in effect until 900 PM CDT for south central South Dakota. LAT...LON 4300 10019 4333 10020 4335 9954 4300 9953 TIME...MOT...LOC 0044Z 299DEG 15KT 4321 9992 Bunkers
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
703 PM MDT FRI AUG 09 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0605 PM HAIL 4 SSW COLOME 43.21N 99.74W
08/09/2019 E1.00 INCH TRIPP SD PUBLIC
&&
TJGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
811 PM MDT FRI AUG 09 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0809 PM HEAVY RAIN 10 ENE WEWELA 43.06N 99.59W
08/09/2019 M2.75 INCH TRIPP SD COCORAHS
&&
MEPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
812 PM MDT FRI AUG 09 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0811 PM FLASH FLOOD 10 ENE WEWELA 43.06N 99.59W
08/09/2019 TRIPP SD COCORAHS
AREA ROADS UNDER WATER
&&
MEPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
852 PM MDT FRI AUG 09 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0852 PM HEAVY RAIN 1 N WEWELA 43.03N 99.78W
08/09/2019 M1.58 INCH TRIPP SD OTHER FEDERAL
FELL IN 75 MINUTES
&&
METhe North Platte radar (KLNX), 142 km away, was scanning. The volume nearest the first event began at 06:31 UTC.
1 flash flood. Local standard time, as filed.
Runoff from two to three inches of rain caused flash flooding around Wewela. A few roads, including 328th Avenue, 331st Avenue, and 229th Street were covered with water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2019Every state in 2019This day in weather historyWarnings in South Dakota, August 2019
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: 855554.