An atmospheric river will bring heavy rainfall to lower elevations of California this week, and heavy snow to the Sierra Nevada mountains. Flash flooding, some of which may be locally considerable, will be a concern on the western foothills of the Sierra Nevada mountains through Tuesday. Landslides, rockfalls and mudslides are possible in the Southern California mountains. Read More >
Overview
| In the afternoon of August 8th, 2020, thunderstorms developed across eastern Wyoming and western South Dakota. These brought large hail and damaging winds to the area through the evening. One storm that developed over the Black Hills produced grapefruit-sized (4.5 inch) hail! As the storms shifted eastward, they formed a line, developing into a mesoscale convective system as more storms converged together. The main threat changed from hail to strong winds, with nearly 80 mph gusts reported across south central South Dakota. As the storms passed, magnificent mammatus was seen by many. |  Pactola (R. Strom) |
Photos
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| Silver City (T. Kammerer) |
Silver City (T. Kammerer) |
Pactola (B. Huey) |
Silver City (T. Kammerer) |
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| Badlands (R. Royer) |
Crazy Horse (C. Schmidt) |
Rapid City (A. W. Phelps) |
South of Lead (C. Petrick) |
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| South of Pactola (J. Fowler) |
Wall (B. Law) |
1 West Rapid City (S. Donaldson) |
Pactola (J. Woods) |
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| Johnson Siding (K. Kooima) |
Pactola (M.K. Lemmel) |
Pactola (M.K. Lemmel) |
Highway 44 (K. Jones) |
Saturday evening saw severe storms move through Pactola Reservoir and the Black Hills. Baseball sized hail is absolutely nothing to mess with. Hoping for a quick recovery for this resident. Always take warnings seriously. @NWSRapidCity pic.twitter.com/GMWUeWvG9q
— Brant Beckman ? (@BrantBeckmanwx) August 9, 2020
Golf ball sized hail south of Rockerville @NWSRapidCity pic.twitter.com/1Pg9Yvirsn
— Jordan Hall (@TheOJordanHall) August 9, 2020
Radar
Storm Reports
The storm reports listed below are in descending order and may not
necessarily be the final storm reports.
Hail reports listed by size (inches)
SIZE LOCATION ST COUNTY TIME
------ ----------------------- -- -------------- -------
4.50 1 N PACTOLA RESV SD PENNINGTON 0510 PM
4.00 1 N PACTOLA RESV SD PENNINGTON 0505 PM
2.75 2 NNW PACTOLA RESV SD PENNINGTON 0500 PM
2.50 2 NE SILVER CITY SD PENNINGTON 0459 PM
GROUND IS WHITE
1.75 2 ESE ROCKERVILLE SD PENNINGTON 0600 PM
1.75 PACTOLA RESV SD PENNINGTON 0530 PM
1.00 5 N SCENIC SD PENNINGTON 0740 PM
FEW PIECES OF HAIL
1.00 1 E DWTN RAPID CITY SD PENNINGTON 0605 PM
1.00 4 NNW BLACK HAWK SD MEADE 0540 PM
1.00 7 NW EDGEMONT SD FALL RIVER 0520 PM
MAINLY HALF-INCH HAIL WITH A FEW ONE INCH
PIECES. HAIL COMPLETELY COVERED THE GROUND.
1.00 2 NW EDGEMONT SD FALL RIVER 0515 PM
MAINLY PEA TO MARBLE HAIL WITH BIGGEST PIECES
AROUND 1 INCH.
1.00 7 E LAKEVIEW SD TODD 0915 PM
18 BROKEN WINDOWS, GARDEN GONE
0.88 1 SW HERMOSA SD CUSTER 0640 PM
0.47 INCHES OF RAINFALL ENDING AT 704 PM
0.75 4 SW DWTN RAPID CITY SD PENNINGTON 0545 PM
BIGGEST PIECE THREE QUARTER INCH BUT MOST WAS
SMALLER. LASTED 15 MINUTES.
Tstm wind reports listed by speed (mph)
SPEED LOCATION ST COUNTY TIME
------ ----------------------- -- -------------- -------
79.00 15 SSE MISSION SD TODD 0914 PM
77.00 4 SSE WITTEN SD TRIPP 1004 PM
65.00 FARMINGDALE SD PENNINGTON 0703 PM
64.00 3 ESE PINE RIDGE SD OGLALA LAKOTA 0655 PM
62.00 3 WSW FAIRBURN SD CUSTER 0633 PM
61.00 1 NE WINNER SD TRIPP 1019 PM
60.00 19 ESE SAINT FRANCIS SD TODD 0915 PM
60.00 5 NNW FAIRBURN SD CUSTER 0637 PM
60.00 12 ENE BUFFALO GAP SD CUSTER 0655 PM
SMALL BRANCHES BROKEN OFF TREES.
60.00 6 SW HERMOSA SD CUSTER 0636 PM
59.00 11 SW PARMELEE SD TODD 0904 PM
57.00 2 W HAMILL SD TRIPP 1040 PM
57.00 7 E WANBLEE SD JACKSON 0839 PM
56.00 6 W PARMELEE SD TODD 0910 PM
56.00 11 SW PARMELEE SD TODD 0858 PM
56.00 4 E CACTUS FLAT SD JACKSON 0824 PM
56.00 3 NNW SCENIC SD PENNINGTON 0730 PM
55.00 4 E CACTUS FLAT SD JACKSON 0839 PM
55.00 2 NNE PINE RIDGE SD OGLALA LAKOTA 0655 PM
54.00 7 E WANBLEE SD JACKSON 0834 PM
54.00 RAPID CITY ARPT SD PENNINGTON 0606 PM
52.00 WEWELA SD TRIPP 0954 PM
52.00 3 NNW SCENIC SD PENNINGTON 0720 PM
51.00 9 SW BATESLAND SD OGLALA LAKOTA 0804 PM
50.00 5 N SCENIC SD PENNINGTON 0740 PM
FEW PIECES OF HAIL
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