Showers and thunderstorms with heavy rainfall, with a few thunderstorms being severe, are expected over portions of the Southeast and Mid-Atlantic States through Monday. Across the Rockies and Intermountain West, a storm system will bring showers, thunderstorms and high elevation snow.
Overview
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A strong upper-level low pressure moved from the Rockies on May 5, 2024, to the northern plains on May 6-8, 2024. Deep surface low pressure developed over southwestern North Dakota. Ahead of the system, strong gusty southeast winds developed on May 5 pulling in plentiful moisture. As the system strengthened May 6-7, strong northwest winds (up to 79 MPH) developed with heavy, wet snow over the highest Black Hills. Numerous power outages were reported coincident with the snow and high winds. As the two air masses clashed, a line of thunderstorms developed on May 6 in the morning. The thunderstorms produced minor flooding in Gillette, WY. Over western South Dakota, a line of thunderstorms developed – containing isolated severe thunderstorms – with one storm producing two tornadoes near Mud Butte, SD early in the afternoon on May 6. Significant liquid-equivalent precipitation fell. 1 to locally 3” fell over northeastern Wyoming and the Black Hills. Amounts on the western South Dakota plains varied widely with some folks getting very little and others around an inch. 14-18” of snow fell near Four Corners, WY, and O’Neil Pass, SD. |
 Moskee, WY Courtesy Becky Stoddard |
 Gillette, WY Courtesy David King |
 Near Mud Butte, SD May 6, 2024 1245 PM MDT Courtesy Joshua Tatman |
Tornadoes
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Tornado #1 - 11 miles SW Mud Butte
Track Map  
Downloadable KMZ File |
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Tornado #2 - 12 miles W Mud Butte
Track Map
Downloadable KMZ File |
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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Wind
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| Rapid City tree damage due to non-thunderstorm wind gusts Courtesy Katherine Anderson |
Map of peak non-thunderstorm wind gusts for May 6, 2024 12am to May 8, 2024 11pm.
Here is a listing of all peak wind gusts for May 5-7, 2024. Most of the maximum observed wind gusts were non-thunderstorm winds.
...MAXIMUM OBSERVED WINDS SORTED BY MAGNITUDE... LOCATION MAX WIND COMMENTS MPH 12 E Oelrichs SD 79 1023 PM 5/06/2024 10 W Jewel Cave SD 78 1245 AM 5/07/2024 1 NE Echeta WY 74 751 PM 5/06/2024 1 S Buffalo Gap SD 73 835 PM 5/06/2024 5 NE Porcupine SD 73 341 AM 5/07/2024 10 S Hot Springs SD 72 916 PM 5/06/2024 1 NE Midland SD 71 923 AM 5/07/2024 8 WNW Fairburn SD 71 318 AM 5/07/2024 3 WNW Whitewood SD 70 932 AM 5/07/2024 6 W Cottonwood SD 70 740 AM 5/07/2024 7 E Sturgis SD 69 950 AM 5/07/2024 3 NW Wasta SD 69 945 AM 5/07/2024 3 ESE Pine Ridge SD 68 205 AM 5/07/2024 15 SSE Mission SD 68 218 PM 5/06/2024 3 W Union Center SD 68 301 AM 5/07/2024 9 SW Batesland SD 67 119 AM 5/07/2024 1 ENE Mud Butte SD 67 509 PM 5/07/2024 6 W Parmelee SD 67 428 PM 5/06/2024 11 ESE Oelrichs SD 67 130 AM 5/07/2024 4 S Dwtn Rapid City SD 66 310 AM 5/07/2024 4 E Cactus Flat SD 66 729 AM 5/07/2024 10 NNW Ottumwa SD 66 935 AM 5/07/2024 7 WSW Hoover SD 66 514 AM 5/07/2024 1 N Buffalo SD 66 747 AM 5/07/2024 11 W Hot Springs SD 65 313 AM 5/07/2024 2 ENE Rockerville SD 65 846 PM 5/06/2024 2 SW Bridger SD 65 432 PM 5/07/2024 19 NNE Creighton SD 65 120 PM 5/06/2024 13 NE Newell SD 64 1201 PM 5/07/2024 2 SSW Custer SD 64 211 AM 5/07/2024 Howes SD 64 858 AM 5/07/2024 8 N Redig SD 64 1005 AM 5/07/2024 3 E Philip SD 64 845 AM 5/07/2024 Union Center SD 63 325 AM 5/07/2024 9 NNE Edgemont SD 62 1257 AM 5/07/2024 1 NNE Faith SD 62 838 AM 5/07/2024 11 SW Parmelee SD 62 1028 PM 5/06/2024 7 E Wanblee SD 62 404 PM 5/06/2024 5 NNW Dwtn Gillette WY 62 845 PM 5/06/2024 12 WSW Castle Rock SD 61 244 PM 5/07/2024 Pringle SD 61 909 AM 5/07/2024 14 NNW Edgemont SD 61 1215 AM 5/07/2024 19 WNW Castle Rock SD 60 200 AM 5/07/2024 3 WSW Fairburn SD 60 953 PM 5/06/2024 3 SE Dwtn Spearfish SD 60 411 PM 5/07/2024 1 NNW Piedmont SD 59 330 AM 5/07/2024 4 NNE Angostura Res SD 59 1255 AM 5/07/2024 10 W Edgemont SD 59 1235 AM 5/07/2024 11 W Milesville SD 59 320 PM 5/07/2024 1 NNW Nisland SD 59 1155 PM 5/06/2024 27 WNW Castle Rock SD 59 1156 PM 5/06/2024 20 NW Castle Rock SD 58 530 PM 5/07/2024 8 E Prairie City SD 58 1030 AM 5/07/2024 5 WNW New Underwood SD 58 845 AM 5/07/2024 10 NNE White River SD 58 158 PM 5/06/2024 1 ESE Martin SD 58 955 PM 5/06/2024 8 S Wall SD 58 320 AM 5/07/2024 2 W Hamill SD 58 125 PM 5/06/2024 4 N Ludlow SD 57 257 PM 5/05/2024 13 W Oglala SD 57 127 AM 5/07/2024 13 SSW Reva SD 56 1153 AM 5/07/2024 7 NNE Ralph SD 56 156 PM 5/05/2024 9 ENE Belvidere SD 56 143 PM 5/06/2024 13 NW Belle Fourche SD 56 849 PM 5/06/2024 4 SSE Witten SD 56 223 PM 5/06/2024 6 W Rochford SD 56 908 AM 5/07/2024 4 E Dwtn Spearfish SD 56 1115 AM 5/07/2024 Rapid City Arpt SD 56 359 PM 5/07/2024 1 WNW Caputa SD 55 915 AM 5/07/2024 Usta SD 55 915 AM 5/07/2024 Ellsworth AFB SD 55 812 AM 5/07/2024 7 ESE Rosebud SD 55 1200 AM 5/07/2024 7 W Ardmore SD 55 1240 AM 5/07/2024 1 E Dwtn Rapid City SD 54 959 AM 5/07/2024 Bison SD 54 415 PM 5/05/2024 1 W Box Elder SD 54 852 AM 5/07/2024 Wewela SD 54 328 PM 5/06/2024 3 ESE Lemmon SD 53 355 PM 5/05/2024 1 NE Winner SD 53 113 PM 5/06/2024 6 WSW Opal SD 53 545 PM 5/07/2024 2 E Cottonwood SD 53 355 AM 5/07/2024 3 NNW Scenic SD 53 208 PM 5/07/2024 1 S White River SD 53 155 PM 5/06/2024 6 WNW Newcastle WY 53 1255 AM 5/07/2024 1 E Lead SD 53 900 AM 5/07/2024 3 W Lemmon SD 53 113 PM 5/05/2024 1 ESE Ladner SD 53 100 PM 5/05/2024 10 W Reva SD 52 715 AM 5/07/2024 Wasta SD 52 255 AM 5/07/2024 6 NE Summerset SD 51 627 AM 5/07/2024 2 ESE Dwtn Spearfish SD 51 1134 AM 5/07/2024 2 NNW Pactola Res SD 51 251 PM 5/07/2024 7 SSE Meadow SD 51 425 PM 5/07/2024 3 N Redig SD 51 1145 AM 5/05/2024 1 WSW South Eagle Butte SD 51 255 PM 5/06/2024 8 W Jewel Cave SD 50 854 AM 5/07/2024
Flooding
Locally heavy rain fell early in the morning on May 6, 2024 resulting in minor flooding in Gillette, WY.
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| Gillette, WY Courtesy David King |
Gillette, WY Courtesy David King |
Gillette, WY Courtesy David King |
Gillette, WY Courtesy David King |
Snow
...PRELIMINARY SNOW AND SLEET TOTALS SORTED BY MAGNITUDE... LOCATION SNOWFALL COMMENTS IN/S/ 1 W O`Neil Pass SD 18.0 1000 AM 5/08/2024 4 NNE Four Corners WY 15.0 1200 PM 5/07/2024 5 W Sundance WY 9.0 1011 PM 5/07/2024 8 NNW Newcastle WY 9.0 700 AM 5/07/2024 3 SE Deerfield SD 7.0 1044 AM 5/07/2024 7 SSE Sundance WY 6.0 759 AM 5/07/2024 Rochford SD 6.0 1100 AM 5/07/2024 3 ESE Cheyenne Crossing SD 5.4 700 AM 5/08/2024 Cheyenne Crossing SD 3.0 756 AM 5/07/2024 Sundance WY 2.3 600 AM 5/08/2024 1 ESE Newcastle WY 2.0 900 AM 5/07/2024 1 SE Newcastle WY 2.0 800 AM 5/07/2024 Mount Rushmore SD 0.2 1258 AM 5/08/2024
Photos & Video
Tornadoes (May 6, 2024)
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| Near Mud Butte, SD Before Tornadogenesis Courtesy Joshua Tatman |
Near Mud Butte, SD 1229 PM MDT Courtesy Joshua Tatman |
Near Mud Butte, SD 1245 PM MDT Courtesy Joshua Tatman |
Near Mud Butte, SD 1248 PM MDT Courtesy Joshua Tatman |
Snow
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| Sundance, WY Courtesy Dave Hurd |
Custer, SD Courtesy Karen Henman |
O'Neill Pass, SD Courtesy Karri Riege |
Four Corners, WY Courtesy Missy Brand |
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| Four Corners, WY Courtesy Missy Brand |
Four Corners, WY Courtesy Missy Brand |
12S Deadwood, SD Courtesy Tammy Burns |
Moskee, WY Courtesy Becky Stoddard |
Thunderstorms
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| Downed Power Pole 3WNW Batesland, SD Courtesy AJ Granelli |
May 6, 2024 Noon: Taken in Belle Fource looking east toward the storm that produced the tornado Courtesy Cobra H Rhod |
Pea Size Hail in Whitewood, SD Courtesy Sharon Kirkpatrick-Sanchez |
Twin tornados yesterday southwest of Mud Butte, South Dakota. Surprisingly stout given the marginal parameters.
— Slim Tatman (@SlimTatman)
Several other storms in the vicinity also had brief rotations and funnels, but didn't have adequately perpendicular shear.
Tornado Southwest of mud Butte, South Dakota about 12:45 p.m.
— Slim Tatman (@SlimTatman)
Fast scud rises and several possible funnels on base of storm approaching mud Butte. 12:30 p.m.
— Slim Tatman (@SlimTatman)
Things got interesting for a quick second north east of Faith around 3:50 local time â聛¦&补肠颈谤肠;聛&肠辞辫测;
— Shane Ornelas (@ShaneHpns)
Radar
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| Radar Estimated Hail Tracks May 6, 2024 |
24-hour Cloud-to-Ground Lightning Flashes May 6, 2024 |
May 6, 2024 11am to 7pm Convective Warning Polygons | Radar Storm Relative Velocity During the 2nd Tornado May 6, 2024 120pm |
May 6, 2024 6am to 12pm Radar Loop
May 6, 2024 12pm to 6pm Radar Loop
May 6, 2024 6pm to May 7, 2024 6pm Radar Loop
Rain Reports
Estimated 3-day precipitation May 5, 2024 6am MDT to May 8, 2024 6am
...PRELIMINARY RAINFALL TOTALS SORTED BY MAGNITUDE... LOCATION TOTAL RAIN COMMENTS IN/S/ 1 S Devils Tower WY 3.18 800 AM 5/08/2024 8 NNW Newcastle WY 3.10 700 AM 5/08/2024 3 SE Saint Onge SD 3.09 600 AM 5/08/2024 5 SSE Dwtn Gillette WY 3.06 624 AM 5/08/2024 Sundance WY 3.03 600 AM 5/08/2024 4 SSW Saint Onge SD 2.96 700 AM 5/08/2024 1 SSW Rozet WY 2.90 800 AM 5/08/2024 1 SE Newcastle WY 2.68 800 AM 5/08/2024 1 N Upton WY 2.68 800 AM 5/08/2024 1 ESE Newcastle WY 2.65 900 AM 5/07/2024 11 NNE Weston WY 2.47 700 AM 5/08/2024 1 WSW Newcastle WY 2.46 700 AM 5/08/2024 1 SSW Sturgis SD 2.37 700 AM 5/08/2024 10 N Osage WY 2.32 700 AM 5/08/2024 5 NNW Dwtn Gillette SD 2.28 800 AM 5/08/2024 19 SW Upton WY 2.22 800 AM 5/08/2024 14 SW Weston WY 2.17 800 AM 5/07/2024 3 E Newcastle WY 2.17 600 AM 5/08/2024 8 ENE Alva WY 2.15 700 AM 5/08/2024 Newcastle WY 2.15 445 AM 5/07/2024 9 NNE Edgemont SD 2.10 800 AM 5/08/2024 3 SE Nisland SD 1.95 800 AM 5/08/2024 25 ESE Wright SD 1.92 800 AM 5/07/2024 3 SE Spearfish SD 1.88 800 AM 5/08/2024 Vale SD 1.86 730 AM 5/07/2024 Wright WY 1.73 700 AM 5/08/2024 4 SSE Devils Tower WY 1.73 730 AM 5/08/2024 1 S Belle Fourche SD 1.66 700 AM 5/08/2024 2 W Moorcroft WY 1.63 700 AM 5/08/2024 8 WSW Rozet WY 1.62 700 AM 5/08/2024 3 NNE Moorcroft WY 1.59 600 AM 5/08/2024 1 SSE Dwtn Spearfish SD 1.58 800 AM 5/08/2024 7 SE Moorcroft WY 1.57 800 AM 5/08/2024 4 SE Upton WY 1.50 700 AM 5/08/2024 14 NW Edgemont SD 1.42 800 AM 5/07/2024 Lemmon SD 1.41 600 PM 5/06/2024 1 SW Newell SD 1.37 800 AM 5/08/2024 1 NNW Dwtn Spearfish SD 1.37 1000 AM 5/08/2024 1 NE Echeta WY 1.36 800 AM 5/08/2024 1 NW Dwtn Spearfish SD 1.36 800 AM 5/08/2024 9 NNE Sturgis SD 1.27 700 AM 5/08/2024 3 SSW Argyle SD 1.27 700 AM 5/08/2024 Parmlee SD 1.27 800 AM 5/07/2024 2 WNW Dwtn Spearfish SD 1.26 700 AM 5/08/2024 Edgemont SD 1.25 700 AM 5/08/2024 5 SW Upton WY 1.25 700 AM 5/08/2024 Tilford SD 1.24 700 AM 5/07/2024 Lead SD 1.23 900 AM 5/08/2024 6 NNW Dwtn Spearfish SD 1.21 700 AM 5/08/2024 11 NE Morrisey WY 1.20 700 AM 5/07/2024 14 NNW Dwtn Gillette WY 1.20 700 AM 5/07/2024 1 NNE Faith SD 1.19 800 AM 5/07/2024 4 NNW Tilford SD 1.15 800 AM 5/07/2024 1 ESE Moorcroft WY 1.12 600 AM 5/08/2024 1 NNE Edgemont SD 1.10 700 AM 5/07/2024 2 ENE Edgemont SD 1.08 700 AM 5/07/2024 2 E Vale SD 1.06 800 AM 5/08/2024 Newell SD 1.05 900 AM 5/07/2024 1 WNW Lemmon SD 1.03 900 AM 5/06/2024 1 NNW Nisland SD 1.03 800 AM 5/08/2024 2 NW Sundance WY 1.01 700 AM 5/08/2024 3 ESE Cheyenne Crossing SD 1.00 700 AM 5/08/2024 1 E Lead SD 0.95 800 AM 5/08/2024 1 WSW Custer SD 0.90 800 AM 5/07/2024 1 NNW Piedmont SD 0.88 800 AM 5/07/2024 14 NNW Edgemont SD 0.88 800 AM 5/08/2024 1 SW Deadwood SD 0.85 1243 AM 5/07/2024 6 SE Dwtn Gillette WY 0.83 800 AM 5/07/2024 4 W Custer SD 0.81 800 AM 5/08/2024 13 W Rockypoint WY 0.80 800 PM 5/05/2024 6 WSW Provo SD 0.78 800 AM 5/07/2024 5 SW Brownsville SD 0.77 800 AM 5/08/2024 4 W Hot Springs SD 0.75 700 AM 5/07/2024 6 SW Beulah WY 0.75 800 AM 5/07/2024 4 SE Sturgis SD 0.74 800 AM 5/08/2024 2 E Sturgis SD 0.72 700 PM 5/07/2024 3 SSE Harding SD 0.70 900 AM 5/07/2024 27 WNW Castle Rock SD 0.70 800 AM 5/08/2024 7 E Sturgis SD 0.68 800 AM 5/08/2024 Piedmont SD 0.67 700 AM 5/07/2024 Hot Springs SD 0.64 700 AM 5/08/2024 1 WNW Wind Cave Visitors Cent 0.54 200 PM 5/07/2024 4 NW Dwtn Rapid City SD 0.54 700 AM 5/07/2024 14 SSW Provo SD 0.54 800 AM 5/07/2024 1 W Wind Cave Visitors Center 0.52 800 AM 5/08/2024 19 NNE Creighton SD 0.52 700 AM 5/07/2024 7 W Ardmore SD 0.47 800 AM 5/08/2024 2 S Pactola Resv SD 0.45 600 AM 5/07/2024 4 SE Gillette WY 0.45 530 PM 5/07/2024 Nemo SD 0.42 800 AM 5/08/2024 7 S Shadehill SD 0.41 800 AM 5/08/2024 4 W Dwtn Rapid City SD 0.39 700 AM 5/08/2024 10 E Custer SD 0.39 730 AM 5/07/2024 2 SSW Custer SD 0.38 800 AM 5/07/2024 9 SSE Sorum SD 0.37 700 AM 5/08/2024 4 WNW Dwtn Rapid City SD 0.34 700 AM 5/07/2024 Jewel Cave SD 0.34 800 AM 5/08/2024 6 WSW Opal SD 0.32 700 AM 5/08/2024 2 WSW Hamill SD 0.31 700 AM 5/07/2024 3 ESE Lemmon SD 0.28 800 AM 5/08/2024 2 N Summerset SD 0.27 800 AM 5/07/2024 6 WNW Union Center SD 0.26 700 AM 5/08/2024 9 N Cedar Butte SD 0.26 600 AM 5/08/2024 4 NNE Johnson Siding SD 0.26 800 AM 5/07/2024 4 NNE Summerset SD 0.25 600 AM 5/07/2024 9 NW Ludlow SD 0.25 700 AM 5/07/2024 14 WNW Lodgepole SD 0.25 800 AM 5/08/2024 7 WSW Folsom SD 0.24 530 AM 5/07/2024 12 NNW White River SD 0.22 700 AM 5/08/2024 Mount Rushmore SD 0.22 1258 AM 5/08/2024 3 NE Hisega SD 0.21 700 AM 5/07/2024 3 NNE Johnson Siding SD 0.21 700 AM 5/07/2024 2 WNW Custer SD 0.21 800 AM 5/08/2024 7 WSW Fairburn SD 0.20 830 AM 5/07/2024 Union Center SD 0.20 800 AM 5/08/2024 16 SSE Mission SD 0.20 600 AM 5/07/2024 10 W Reva SD 0.19 800 AM 5/08/2024 Hill City SD 0.19 700 AM 5/07/2024 9 SE Meadow SD 0.19 700 AM 5/07/2024 4 W Rapid City SD 0.19 800 AM 5/07/2024 1 N Buffalo SD 0.19 800 AM 5/08/2024 6 NE Summerset SD 0.18 800 AM 5/07/2024 5 ENE Custer SD 0.18 700 AM 5/07/2024 1 WSW South Eagle Butte SD 0.16 800 AM 5/08/2024 4 WNW Cedar Butte SD 0.15 800 AM 5/08/2024 12 SSE Milesville SD 0.15 700 AM 5/06/2024 4 E Hisega SD 0.14 652 AM 5/07/2024 14 S Mission SD 0.13 700 AM 5/07/2024 1 ESE Pactola Resv SD 0.13 900 AM 5/07/2024 9 N Kirley SD 0.12 900 AM 5/06/2024 1 N Hisega SD 0.12 700 AM 5/07/2024 2 WNW Dwtn Rapid City SD 0.12 700 AM 5/07/2024 3 ESE Pine Ridge SD 0.11 800 AM 5/08/2024 3 WNW Kadoka SD 0.11 530 AM 5/07/2024 1 ENE Custer SD 0.11 700 AM 5/07/2024 2 E Cottonwood SD 0.11 200 PM 5/07/2024 7 N Wood SD 0.10 600 AM 5/08/2024 6 W New Underwood SD 0.10 700 AM 5/07/2024 2 E Cottonwood SD 0.10 800 AM 5/07/2024 3 N Ottumwa SD 0.10 700 AM 5/08/2024 6 SSW Fairpoint SD 0.10 635 AM 5/08/2024 4 NNW Elm Springs SD 0.09 600 AM 5/08/2024 6 W Hermosa SD 0.09 700 AM 5/07/2024 1 WNW Caputa SD 0.09 800 AM 5/07/2024 5 NW Swett SD 0.09 756 AM 5/07/2024 2 SW Dwtn Rapid City SD 0.08 800 AM 5/07/2024 8 WNW Fairburn SD 0.08 800 AM 5/07/2024 Bison SD 0.08 800 AM 5/08/2024 6 W Rochford SD 0.08 800 AM 5/08/2024 7 N Kirley SD 0.08 700 AM 5/06/2024 7 ESE Rosebud SD 0.08 800 AM 5/07/2024 Oral SD 0.07 700 AM 5/06/2024 9 N Wewela SD 0.07 700 AM 5/07/2024 11 W Milesville SD 0.07 800 AM 5/07/2024 1 S White River SD 0.07 800 AM 5/07/2024 2 ENE Sheridan Lake SD 0.06 800 AM 5/07/2024 Rapid City Arpt SD 0.06 800 AM 5/07/2024 4 S Dwtn Rapid City SD 0.05 700 AM 5/07/2024 3 WNW Milesville SD 0.05 700 AM 5/06/2024 Hermosa SD 0.05 600 AM 5/07/2024 7 NNE Ellsworth AFB SD 0.05 700 AM 5/07/2024 9 ENE Wewela SD 0.04 600 AM 5/07/2024 3 E Philip SD 0.04 800 AM 5/07/2024 11 SSE Hamill SD 0.03 600 AM 5/07/2024 12 S Quinn SD 0.03 800 AM 5/07/2024 1 SSW Box Elder SD 0.03 700 AM 5/07/2024 5 NE Porcupine SD 0.03 800 AM 5/07/2024 Cedar Pass SD 0.03 500 PM 5/07/2024 5 NE Milesville SD 0.02 700 PM 5/07/2024 Wasta SD 0.02 800 AM 5/07/2024 1 SW Dwtn Rapid City SD 0.02 700 AM 5/08/2024 1 NE Dwtn Rapid City SD 0.02 600 AM 5/08/2024 2 SSW Oral SD 0.01 800 AM 5/07/2024 1 NE Winner SD 0.01 800 AM 5/07/2024 8 S Wall SD 0.01 800 AM 5/07/2024 2 W Hamill SD 0.01 800 AM 5/07/2024 4 NW Parmelee SD 0.01 700 AM 5/08/2024
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