Heavy rainfall capable of causing flash flooding will continue to impact Hawaii through Monday. Severe thunderstorms and heavy rain are possible in parts of Texas and the southern Plains and the Upper Great Lakes. Heavy mountain snow continues in California's Sierra Nevada and rain with gusty winds to lower elevations. Super Typhoon Sinlaku will impact the Marianas through midweek. Read More >
Overview
During the afternoon of Monday, August 14th, thunderstorms developed over the northern Black Hills. They gradually merged into a powerful supercell, which moved directly over Rapid City, bringing heavy rain, large hail, and damaging winds. The hail and winds damaged vehicles, gardens, and other property, and runoff from the heavy rain caused flooding. Meanwhile, more storms developed to the southeast of this storm. As the supercell tracked southeastward, a long duration of heavy rain resulted in flash flooding in Oglala Lakota county. Around Sharps Corner, flooding along Porcupine Creek washed out roads and stranded residents and travelers. Additional thunderstorms expanded over the area during the evening. Below are several pictures we received, a radar loop depicting the storms, and a list of significant reports.
Photos:
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| Storm Clouds (Michelle Cockayne Wilson) |
Storm Clouds (Kelly Whitaker) |
Storm Clouds (Kirby Lirio) |
Hail in West Rapid City (Galen Hoogestraat) |
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| Hail in Southwest Rapid City (Jade Herman) |
Hail in Rapid City (Brad Willits) |
Hail in Rapid City (Katie Pojorlie) |
Hail in Southwest Rapid City (Jennifer Rouse) |
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| Hail in West Rapid City (Ti Rah) |
Hail Damage in West Rapid City (Ti Rah) |
Heavy Rain in Black Hawk (Monte Norman) |
Flooding at the Rushmore Mall (Diana Llanes) |
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| Hail in West Rapid City (Colleen Hurley) |
Hail in West Rapid City (Dominique Lynn) |
Flooding in South Rapid City (John Hammond) |
Flooding near Summerset (Susan McKinney) |
Radar Loop
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 ------ ----------------------- -- -------------- ------- 2.75 SHARPS CORNER SD OGLALA LAKOTA 0740 PM 2.75 1 N ROCKYFORD SD OGLALA LAKOTA 0645 PM RELAYED THROUGH LAW ENFORCEMENT FROM BNP RANGER 2.00 4 WNW NEMO SD LAWRENCE 0359 PM LASTED 5 MINUTES 1.75 5 E PORCUPINE SD OGLALA LAKOTA 0845 PM 1.75 4 SSW RAPID CITY SD PENNINGTON 0616 PM 1.75 3 SSW DOWNTOWN RAPID CI SD PENNINGTON 0609 PM 1.75 1 SW DOWNTOWN RAPID CIT SD PENNINGTON 0605 PM 1.75 BLACKHAWK SD MEADE 0545 PM 1.75 1 SE PIEDMONT SD MEADE 0446 PM 1.75 1 NNW PIEDMONT SD MEADE 0442 PM 1.50 2 N PORCUPINE SD OGLALA LAKOTA 0740 PM 1.50 4 SSW RAPID CITY SD PENNINGTON 0615 PM 1.50 4 N DOWNTOWN RAPID CITY SD PENNINGTON 0600 PM 1.50 HISEGA SD PENNINGTON 0547 PM 1.25 5 NW NEMO SD LAWRENCE 0359 PM 1.00 2 S PORCUPINE SD OGLALA LAKOTA 0855 PM 1.00 22 NNW BELLE FOURCHE SD BUTTE 0701 PM 1.00 2 SSE DOWNTOWN RAPID CI SD PENNINGTON 0613 PM 1.00 RAPID CITY SD PENNINGTON 0609 PM SKYLINE DR 1.00 1 N RAPID CITY SD PENNINGTON 0605 PM 1.00 HISEGA SD PENNINGTON 0600 PM 1.00 2 N JOHNSON SIDING SD PENNINGTON 0524 PM 1.00 PIEDMONT SD MEADE 0515 PM RAIN ACCUMULATION IN 1 HOUR 1.00 4 NNE NEMO SD LAWRENCE 0425 PM 1.00 1 NNW PIEDMONT SD MEADE 0415 PM 0.88 4 S NEWELL SD BUTTE 0820 PM TSTM WIND REPORTS LISTED BY SPEED (MPH) SPEED LOCATION ST COUNTY TIME ------ ----------------------- -- -------------- ------- 66.00 1 E DOWNTOWN RAPID CITY SD PENNINGTON 0559 PM 61.00 5 NE PORCUPINE SD OGLALA LAKOTA 0841 PM 60.00 22 NNW BELLE FOURCHE SD BUTTE 0701 PM 60.00 RAPID CITY SD PENNINGTON 0611 PM 55.00 1 N RAPID CITY SD PENNINGTON 0605 PM 53.00 RAPID CITY AIRPORT SD PENNINGTON 0620 PM 50.00 4 SW NEWELL SD BUTTE 0815 PM 50.00 7 SW RAPID CITY AIRPORT SD PENNINGTON 0620 PM RAIN AMOUNTS (INCHES) AMOUNT LOCATION ST COUNTY TIME ------ ----------------------- -- -------------- ------- 2.65 5 E PORCUPINE SD OGLALA LAKOTA 0900 PM 2.33 1 NNW PIEDMONT SD MEADE 0900 PM 2.02 PIEDMONT SD MEADE 0515 PM RAIN ACCUMULATION IN 1 HOUR 1.59 2 SSE DOWNTOWN RAPID SD PENNINGTON 0730 AM 1.15 1 E DOWNTOWN RAPID CITY SD PENNINGTON 0700 PM OTHER REPORTS REPORT LOCATION ST COUNTY TIME ------ ----------------------- -- -------------- ------- FLASH 2 S SHARPS CORNER SD OGLALA LAKOTA 1122 PM FLOOD ROAD WASHED OUT, PEOPLE STRANDED
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