Recalling the Severe Storms of June 12, 2001

Significant severe weather occurred across much of the area during the later afternoon and evening hours of June 12, 2001.  These storms initiated to the north of a warm frontal boundary which lifted into northeast Nebraska and northwest Iowa by late afternoon.  Earlier in the day, storms initiated to the north of this front, lifting northeast and producing some dime to quarter size hail across northwest Iowa into southwest Minnesota.

A series of supercell thunderstorms erupted across the Tri-State area early in the evening, with at least two tracking directly across Sioux Falls with large hail, damaging winds, and a couple of brief tornado touchdowns.  Hail up to baseball to softball size was reported on the southeastern side of Sioux Falls, causing significant damage to cars and rooves, with most areas of the city experiencing hail of quarter size or larger at least once during the evening.  Figures 1a and 1b below show the two storms which moved across the Sioux Falls area.


Figure 1. Regional radar image at 730 pm CDT 12 June 2001 (left) and 831 pm CDT 12 June 2001.

Signficant hail of quarter to golf ball size also tracked through much of the northwest Iowa north of highway 18, to areas just north of the Minnesota border.  A third in the series of storms formed west of Sioux Falls after sunset, producing a small bow echo tracking eastward with reports of widespread wind damage from eastern South Dakota toward the Iowa Great Lakes.


Figure 2.  Regional radar image at 928 pm 12 June 2001.
 

In addition, a number of weak tornadoes were observed (shown in red in the images below), but produced minimal damage.  Storm reports are plotted in the following image, with tabular data below.

Reports of severe weather from the afternoon of June 12 through early morning of June 13.


Figure 3.  Storm Data reports from 7 am CDT Tuesday, June 12 to 7 am CDT Wednesday, June 13, 2001.  Red represents tornadoes, blue (wind) and green (hail).  Hail size is listed in inches.  Image courtesy of the Storm Prediction Center, and can be produced for numerous events at www.spc.noaa.gov/climo/online/sp3/plot.php .

  

Tornado Reports                      
Time (UTC) F Scale Location County State Lat Lon Comments
0012 UNK 2 W GARRETSON  MINNEHAHA  SD 4371 9654 REPORTED BY PUBLIC. (FSD)      
0041 UNK SIOUX FALLS  MINNEHAHA  SD 4371 9683 REPORTED BY EMERGENCY MANAGEMENT. TREES DOWN AND VEHICLES DAMAGED. (FSD)
0226 UNK 1 S MONTGOMERY  DICKINSON  IA 4341 9519 (FSD)          
0245 UNK OCHEYEDAN  OSCEOLA  IA 4341 9555 (FSD)          
0246 UNK SPIRIT LAKE  DICKINSON  IA 4343 9509 ROPE TORNADO ON GROUND WITH DEBRIS. REPORTED BY MEDIA. (FSD)
0319 UNK 6 S HARTFORD  MINNEHAHA  SD 4353 9694 REPORTED BY EMERGENCY MANAGEMENT. (FSD)  
Hail Reports                      
Time (UTC) Size  Location County State Lat Lon Comments
2117 100 1 NE HARRIS  OSCEOLA  IA 4346 9543 REPORTED BY STORM SPOTTER. (FSD)    
2133 100 RUSHMORE  NOBLES  MN 4361 9580 REPORTED BY LAW ENFORCEMENT OFFICIAL. (FSD)  
2205 100 1 N LUVERNE  ROCK  MN 4349 9625 REPORTED BY LAW ENFORCEMENT OFFICIAL. (FSD)  
2240 75 7 NW HARTLEY  OBRIEN  IA 4310 9558 REPORTED BY MEDIA. (FSD)      
2250 100 MAY CITY  OSCEOLA  IA 4331 9548 REPORTED BY MEDIA. (FSD)      
2303 100 INWOOD  LYON  IA 4331 9644 REPORTED BY STORM SPOTTER. (FSD)    
2326 75 1 S BRANDON  MINNEHAHA  SD 4356 9659 REPORTED BY OFF-DUTY NWS EMPLOYEE. (FSD)  
2327 88 DELL RAPIDS  MINNEHAHA  SD 4381 9671 REPORTED BY EMERGENCY MANAGEMENT. (FSD)  
2334 75 COLTON  MINNEHAHA  SD 4378 9693 REPORTED BY EMERGENCY MANAGEMENT. (FSD)  
2340 75 6 S TEA  LINCOLN  SD 4334 9683 REPORTED BY EMERGENCY MANAGEMENT. (FSD)  
2341 75 ROCK RAPIDS  LYON  IA 4343 9618 (FSD)          
2345 88 ROCK VLY  SIOUX  IA 4319 9630 (FSD)          
2353 75 5 W ELLSWORTH  NOBLES  MN 4351 9613 (FSD)          
2355 175 1 E HARTFORD  MINNEHAHA  SD 4363 9692 REPORTED BY EMERGENCY MANAGEMENT. (FSD)  
0001 175 SIOUX FALLS  MINNEHAHA  SD 4371 9683 REPORTED BY OFF-DUTY NWS EMPLOYEE. (FSD)  
0015 175 ROCK VLY  SIOUX  IA 4319 9630 REPORTED BY STORM SPOTTER. (FSD)    
0024 175 SIOUX FALLS  LINCOLN  SD 4330 9681 (FSD)          
0025 275 SIOUX FALLS  MINNEHAHA  SD 4371 9683 REPORTED BY PUBLIC. (FSD)      
0033 175 1 S BRANDON  MINNEHAHA  SD 4356 9659 REPORTED BY OFF-DUTY NWS EMPLOYEE. (FSD)  
0036 75 ROCK RAPIDS  LYON  IA 4343 9618 (FSD)          
0053 100 SHELDON  SIOUX  IA 4308 9620 (FSD)          
0100 175 MAY CITY  OSCEOLA  IA 4331 9548 REPORTED BY STORM SPOTTER. (FSD)    
0118 175 5 NE FORESTBURG  SANBORN  SD 4407 9801 REPORTED BY STORM SPOTTER. (FSD)    
0119 75 MILFORD  DICKINSON  IA 4333 9514 REPORTED BY MEDIA. (FSD)      
0135 175 BRIDGEWATER  MCCOOK  SD 4354 9750 REPORTED BY MEDIA. (FSD)      
0145 275 OCHEYEDAN  OSCEOLA  IA 4341 9555 REPORTED BY MEDIA. (FSD)      
0155 75 ROCK RAPIDS  LYON  IA 4343 9618 REPORTED BY STORM SPOTTER. (FSD)    
0158 175 10 W MILFORD  DICKINSON  IA 4333 9537 REPORTED BY STORM SPOTTER. (FSD)    
0220 175 SPIRIT LAKE  DICKINSON  IA 4343 9509 REPORTED BY STORM SPOTTER. (FSD)    
0220 100 ELLSWORTH  NOBLES  MN 4351 9601 REPORTED BY STORM SPOTTER. (FSD)    
0223 100 10 SW JACKSON  JACKSON  MN 4349 9516 REPORTED BY STORM SPOTTER. (FSD)    
0238 88 7 S MELVIN  OSCEOLA  IA 4316 9561 REPORTED BY STORM SPOTTER. (FSD)    
0246 175 SPIRIT LAKE  DICKINSON  IA 4343 9509 REPORTED BY MEDIA. (FSD)      
0250 100 IROQUOIS  KINGSBURY  SD 4445 9748 (FSD)          
0315 88 HARTFORD  MINNEHAHA  SD 4363 9694 REPORTED BY EMERGENCY MANAGEMENT. (FSD)  
0456 75 MADISON  LAKE  SD 4400 9711 REPORTED BY LAW ENFORCEMENT OFFICIAL. (FSD)  
0520 75 FLANDREAU  MOODY  SD 4404 9658 REPORTED BY PUBLIC. (FSD)      
0539 88 CROOKS  MINNEHAHA  SD 4366 9681 (FSD)          
0627 75 6 SW CHANDLER  MURRAY  MN 4386 9604 (FSD)          
0628 75 CHAMBERLAIN  BRULE  SD 4379 9933 REPORTED BY LAW ENFORCEMENT OFFICIAL. (FSD)  
0714 175 CHAMBERLAIN  BRULE  SD 4379 9933 REPORTED BY LAW ENFORCEMENT OFFICIAL. (FSD)  
1145 88 6 E HOWARD  MINER  SD 4401 9739 (FSD)          
1153 75 2 SE WINFRED  LAKE  SD 4397 9733 REPORTED BY PUBLIC. (FSD)      
Wind Reports                      
Time (UTC) Speed  Location County State Lat Lon Comments
0104 62 SHELDON  SIOUX  IA 4308 9620 MEASURED BY AWOS AUTOMATIC OBSERVING EQUIPMENT. (FSD)
0158 60 10 W MILFORD  DICKINSON  IA 4333 9537 REPORTED BY STORM SPOTTER. (FSD)    
0244 65 1 S VALLEY SPGS  MINNEHAHA  SD 4356 9646 REPORTED BY EMERGENCY MANAGEMENT. (FSD)  
0356 UNK 2 W SIOUX FALLS  MINNEHAHA  SD 4371 9683 BARN DESTROYED. REPORTED BY EMERGENCY MANAGEMENT. (FSD)
0402 80 SIOUX FALLS  MINNEHAHA  SD 4371 9683 REPORTED BY STORM SPOTTER. (FSD)    
0456 60 COLTON  MINNEHAHA  SD 4378 9693 REPORTED BY LAW ENFORCEMENT OFFICIAL. (FSD)  

 This was hardly a one day event, as on the following day (June 13), another significant severe weather outbreak occurred with large hail, several tornadoes, and a widespread damaging wind event across southwest Minnesota and northwest Iowa with measured winds of 65 to 90 mph.



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