A thunderstorm produced hail to around quarter size around Sheridan Lake.
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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.
A thunderstorm produced hail to around quarter size around Sheridan Lake.
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 25, 10:26 AM MST, 2 hours 49 minutes earlier.
Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 1126 AM MDT Fri Aug 25 2017 .UPDATE... Issued at 1012 AM MDT Fri Aug 25 2017 Current surface analysis shows frontal boundary/warm front stretching from far northwest SD to north central NE. A cold front extends from central SK to southern ID. Upper level analysis shows flattening ridge to the east of the area, with zonal flow and embedded shortwave energy from the northern Rockies to the high plains. KUDX radar shows showers and a few thunderstorms over northwest SD, with severe storms having just developed quickly across southern Ziebach County, moving to the east-northeast. Areas of low clouds and fog are dissipating over the SD plains, with the most clouds still lingering to the north and east of the Black Hills. Temps are in the 60s and lower 70s with mostly light and variable winds. The threat for storms and severe weather will continue to be most favorable to the east of the Black Hills, especially toward south central SD later today, as frontal boundary slowly moves eastward across western and central SD. Weak low pressure is developing along the boundary across southwest SD and will move east- northeast through the afternoon and evening with the front. MLCAPE values of 1000 to 2000 j/kg will be in place through the late afternoon/early evening across much of western and central SD. A stronger storm or two could also develop over the Black Hills area this afternoon. Large hail and strong wind gusts will be the main threats from any severe storms. Main updates this morning were to adjust pcpn coverage and cloud cover late this morning/early afternoon based on current trends. Will leave high temps as is for now, with the coolest temps across northwest SD and the Black Hills. && .DISCUSSION...(Today Through Thursday) Issued at 335 AM MDT Fri Aug 25 2017 Upper ridging sits across the upper Midwest this morning with near zonal flow across the northwest CONUS. A series of waves are crossing MT/WY into the CWA. KUDX radar shows showers and isolated thunderstorms resulting from an upper wave crossing the CWA along with strong theta e advection ahead of a surface low over eastern MT/WY. Showers/storms early this morning will drift eastward mainly across northwest into central SD. Another round of showers are expected this afternoon as upper waves continue to cross the region. Storms are initially expected to develop across the Black Hills. With just a weak cap in place...storms should begin developing by the early afternoon over the Hills...then push eastward into the plains into the mid/late afternoon. Surface low will push eastward into central SD by the afternoon with slightly cooler air pushing in on its backside. This boundary will be across south central SD where storms are expected to develop in the mid to late afternoon. MLCAPE of 2000-3000 J/kg are expected with enough shear for supercell development. Farther west back into the Black Hills area...some strong to severe storms are possible, but the better shear will be east over south central SD. PWATs are estimated to be in the 175% range today over western SD...so think some storms could produce locally heavy rainfall. Another wave could bring in additional storms later tonight across northeast WY into western SD. Models suggest a surface trough developing across the CWA Saturday with storms developing across western SD in the afternoon. MLCAPE will be weaker than today...but still enough shear will be available for some storms to become strong or possibly severe along with locally heavy rainfall. Strong upper ridging is then progged to develop across the western CONUS with the region sitting under northwest flow aloft. Also surface high pressure will develop across the region resulting in dry weather through the first half of next week. Better chances for storms are expected for the second half of the week...but still generally dry weather is expected. Highs through the forecast period will continue to be in the 80s. && .AVIATION...(For the 18Z TAFS Through 18Z Saturday) Issued At 1121 AM MDT Fri Aug 25 2017 Areas of IFR conditions in low stratus and scattered thunderstorms over parts of northwestern and west central South Dakota are expected to slowly shift east by 21Z, then mainly VFR conditions will prevail with the exception of scattered thunderstorms from the Black Hills through south central SD from late afternoon and into the evening. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...None. WY...None. && Update...26 DISCUSSION...13 AVIATION...15
Hazardous Weather Outlook National Weather Service Rapid City SD 1210 PM MDT Fri Aug 25 2017 SDZ014-024>032-041>044-046-047-049-072-074-261300- 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-Hermosa Foot Hills- 1210 PM MDT Fri Aug 25 2017 /110 PM CDT Fri Aug 25 2017/ This Hazardous weather outlook is for portions of south central South Dakota...the Black Hills of South Dakota...and western South Dakota. .DAY ONE...This Afternoon and Tonight There is a chance of showers and thunderstorms today and tonight. Severe thunderstorms will be possible, especially across south central South Dakota late this afternoon and evening. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a chance of showers and thunderstorms on Saturday. Severe thunderstorms will be possible again. .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 SDZ001-002-012-013-073-261300- Harding-Perkins-Butte-Northern Meade Co Plains- Southern Meade Co Plains- 1210 PM MDT Fri Aug 25 2017 This Hazardous weather outlook is for portions of western South Dakota. .DAY ONE...This Afternoon and Tonight There is a chance of showers and thunderstorms today and tonight. Severe thunderstorms are not expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a chance of showers and thunderstorms on Saturday. Severe thunderstorms will be possible. .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 WYZ054>058-071-261300- Northern Campbell-Southern Campbell-Western Crook- Wyoming Black Hills-Weston-Northeastern Crook- 1210 PM MDT Fri Aug 25 2017 This Hazardous weather outlook is for portions of northeast Wyoming...and the Black Hills of Wyoming. .DAY ONE...This Afternoon and Tonight There is a chance of showers and thunderstorms this evening. Severe thunderstorms are not expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a chance of showers and thunderstorms on Saturday. Severe thunderstorms are not expected at this time. .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
1025 AM MDT FRI AUG 25 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1010 AM HEAVY RAIN 22 S DUPREE 44.73N 101.59W
08/25/2017 E3.00 INCH ZIEBACH SD PUBLIC
ESTIMATED 2 TO 3 INCHES HAD FALLEN AND IT IS STILL
RAINING.
&&
AFOSCATOSpecial Weather Statement National Weather Service Rapid City SD 1033 AM MDT FRI AUG 25 2017 SDZ014-251715- Ziebach SD- 1033 AM MDT FRI AUG 25 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ZIEBACH COUNTY UNTIL 1115 AM MDT... At 1032 AM MDT, Doppler radar was tracking a strong thunderstorm 9 miles northeast of Takini School, or 24 miles south of Dupree, moving northeast at 10 mph. Nickel size hail will be possible with this storm. This storm will remain over mainly rural areas of southeastern Ziebach County. 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. && LAT...LON 4461 10166 4478 10178 4491 10143 4471 10128 TIME...MOT...LOC 1632Z 247DEG 8KT 4471 10167 Rudge
Special Weather Statement National Weather Service Rapid City SD 1059 AM MDT FRI AUG 25 2017 SDZ013-014-251745- Ziebach SD-Northern Meade Co Plains SD- 1059 AM MDT FRI AUG 25 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN ZIEBACH AND NORTHEASTERN MEADE COUNTIES UNTIL 1145 AM MDT... At 1059 AM MDT, Doppler radar was tracking a strong thunderstorm near Howes, or 20 miles south of Faith, moving east at 30 mph. Nickel size hail will be possible with this storm. Locations impacted include... Red Scaffold, Howes and Takini School. 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. && LAT...LON 4461 10222 4477 10222 4496 10170 4459 10167 TIME...MOT...LOC 1659Z 268DEG 26KT 4472 10208 Rudge
Special Weather Statement
National Weather Service Rapid City SD
1146 AM MDT FRI AUG 25 2017
SDZ013-014-073-251830-
Ziebach SD-Southern Meade Co Plains SD-Northern Meade Co Plains SD-
1146 AM MDT FRI AUG 25 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN ZIEBACH AND EAST
CENTRAL MEADE COUNTIES UNTIL 1230 PM MDT...
At 1146 AM MDT, Doppler radar was tracking a strong thunderstorm near
Takini School, or 26 miles south of Faith, moving east at 20 mph.
Nickel size hail will be possible with this storm.
Locations impacted include...
Plainview, Bridger, Howes and Takini School.
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.
&&
LAT...LON 4457 10222 4474 10217 4479 10156 4458 10155
4459 10166 4457 10174 4453 10181 4454 10189
4453 10200
TIME...MOT...LOC 1746Z 274DEG 17KT 4464 10194
RudgeSpecial Weather Statement
National Weather Service Rapid City SD
1230 PM MDT FRI AUG 25 2017
SDZ014-032-251930-
Ziebach SD-Haakon SD-
1230 PM MDT FRI AUG 25 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN HAAKON AND SOUTHERN
ZIEBACH COUNTIES UNTIL 130 PM MDT...
At 1230 PM MDT, Doppler radar was tracking a strong thunderstorm near
Cherry Creek, or 28 miles south of Lantry, moving east at 25 mph.
Nickel size hail will be possible with this storm.
Locations impacted include...
Cherry Creek and Takini School.
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.
&&
LAT...LON 4469 10113 4469 10116 4453 10116 4454 10185
4472 10185 4480 10114
TIME...MOT...LOC 1830Z 272DEG 20KT 4462 10161
RudgeSpecial Weather Statement National Weather Service Rapid City SD 201 PM MDT FRI AUG 25 2017 SDZ028-029-074-252045- Hermosa Foot Hills SD-Central Black Hills SD-Southern Black Hills SD- 201 PM MDT FRI AUG 25 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL CUSTER AND SOUTH CENTRAL PENNINGTON COUNTIES UNTIL 245 PM MDT... At 201 PM MDT, Doppler radar was tracking a strong thunderstorm over Black Elk Peak, or near Custer, moving southeast at 10 mph. Dime size hail will be possible with this storm. Locations impacted include... Custer, Keystone, northern Wind Cave National Park, Mount Rushmore National Memorial, Stockade Lake, Legion Lake, Buffalo Corrals, State Game Lodge, Crazy Horse Memorial, Sylvan Lake, Blue Bell, Center Lake, Custer State Park, Mount Coolidge, Black Elk Peak, Black Hills Playhouse and Horse Thief Lake. LAT...LON 4383 10365 4392 10347 4379 10317 4360 10342 TIME...MOT...LOC 2001Z 312DEG 9KT 4384 10352 Rudge
The Rapid City radar (KUDX), 55 km away, was scanning. The volume nearest the first event began at 20:13 UTC.
2 hail. Local standard time, as filed.
Highway 385 was covered with hail several inches deep from Sheridan Lake Road to Calumet Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2017Every state in 2017This day in weather historyWarnings in South Dakota, August 2017
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: 712449, 709903.