Severe Thunderstorms of June 26-27, 2010


Radar Imagery Damage Photos Damage Reports Rainfall Totals

A cluster of strong to severe thunderstorms developed during the early evening hours of June 26 over eastern South Dakota and southwest Minnesota, fueled by very warm and moist air in place across the region.  The thunderstorms then tracked east, forming into a "bow echo" over south central Minnesota. Bow echoes, which are a band of high radar reflectivity values in the shape of a bow, are known to produce damaging winds.  In addition, they may produce large hail and even a few tornadoes.

As this bow echo crossed south central and southeast Minnesota between 10 p.m. and midnight on the 26th, numerous reports of wind damage were received, along with hail up to the size of nickels.  In fact, an automated weather station in Dodge Center, MN reported a hurricane force wind gust of 74 mph. As the bow echo moved into southwest Wisconsin, it began to weaken.  However, a few reports of wind damage along with gusts up to 60 mph occurred in La Crosse and Monroe counties.  Another storm developed ahead of the bow echo in Jackson county, producing a gust of 60 mph in Black River Falls around midnight.

Street flooding was also a problem during this thunderstorm event due to a combination of the moist air and already saturated grounds.  Any thunderstorm was able to produce heavy rainfall, which was especially true with the bow echo.  Rainfall rates were observed between 1/2 and 3/4 quarters of an inch in 15 minutes in Rochester when the bow echo moved through.

Map showing warnings from June 26-67

Map showing the multiple warnings issued late Saturday night (June 26) and early Sunday morning (June 27). Yellow are Severe Thunderstorm Warnings, Red is a Tornado Warning, and Green outlines are Flash Flood Warnings. (Click on image to enlarge) Courtesy of Iowa Environmental Mesonet . The map also shows the area that NWS personnel surveyed the damage to investigate possible tornado touchdowns. The damage in this area was consistent with straight-line winds in the 70-85 mph range from the west to southwest as 90% of the damage fell/aligned toward the northeast.

Damage Photos

storm damage in West Salem

Mower County mower county 2 Freeborn County Freeborn County Freeborn Freeborn
 

Storm damage at Veteran's Park in West Salem, WI. Photo by Paul Kohlmeier. Click on image to enlarge.

Damage in Mower County, MN about 4 miles southwest of Waltham. Damage in Mower County, MN about 4 miles southwest of Waltham. More damage just west of the Mower-Freeborn County line near Moscow, Minnesota.

Radar Imagery

For a radar loop of storms from Saturday evening into Sunday morning - Click Here (8.2 MB)

radar image from 1022 p.m. June 26 2010

radar image from 1055 p.m. June 26 2010

radar image from 1210 a.m. June 27 2010

Doppler radar image from 10:22 p.m. June 26th showing the "bow echo" in the line of severe thunderstorms.  The main "bow" is marked by the white arrow.  (Click on image to enlarge) Doppler radar image from 10:55 p.m. on June 26th showing the "bow echo" marked by the white arrow.  (Click on image to enlarge) Doppler radar image from shortly after Midnight early on June 27th as the line of storms moved through the La Crosse area into western Wisconsin. (Click on image to enlarge)

Storm Reports from June 26-27, 2010

storm reports from June 26 2010 Storm Reports from June 26-27, 2010 (Click on image to enlarge)

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LA CROSSE WI
232 AM CDT SUN JUN 27 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1029 PM     TSTM WND GST     7 W CLAREMONT           44.04N 93.14W
06/26/2010  M50.00 MPH       STEELE             MN   EMERGENCY MNGR

1032 PM     TSTM WND DMG     AUSTIN                  43.67N 92.97W
06/26/2010                   MOWER              MN   LAW ENFORCEMENT

            VEHICLES BLOWN OFF THE ROAD INTO A CORNFIELD AT HIGHWAY
            218 AND INTERSTATE 90.

1037 PM     TSTM WND GST     WEST CONCORD            44.15N 92.90W
06/26/2010  M60.00 MPH       DODGE              MN   EMERGENCY MNGR

1037 PM     TORNADO          BROWNSDALE              43.74N 92.87W
06/26/2010                   MOWER              MN   AMATEUR RADIO

1045 PM     TSTM WND GST     DODGE CENTER            44.03N 92.85W
06/26/2010  M74.00 MPH       DODGE              MN   AWOS

1057 PM     TSTM WND GST     3 NW ORONOCO            44.19N 92.58W
06/26/2010  M55.00 MPH       OLMSTED            MN   EMERGENCY MNGR

1101 PM     TSTM WND GST     ROCHESTER               44.01N 92.48W
06/26/2010  M52.00 MPH       OLMSTED            MN   ASOS

1105 PM     NON-TSTM WND GST ROCHESTER               44.01N 92.48W
06/26/2010  M56.00 MPH       OLMSTED            MN   CO-OP OBSERVER

1110 PM     HAIL             ROCHESTER               44.01N 92.48W
06/26/2010  E0.75 INCH       OLMSTED            MN   CO-OP OBSERVER

1110 PM     TSTM WND GST     1 S ZUMBRO FALLS        44.27N 92.43W
06/26/2010  E50.00 MPH       WABASHA            MN   LAW ENFORCEMENT

1110 PM     TSTM WND DMG     ROCHESTER               44.01N 92.48W
06/26/2010                   OLMSTED            MN   LAW ENFORCEMENT

            NINE TREES DOWN IN THE CITY OF ROCHESTER...SOME ON
            VEHICLES. SCATTERED POWER OUTAGES DUE TO BRANCHES ON
            WIRES...ABOUT 200 HOUSEHOLDS.

1112 PM     HAIL             5 SE ROCHESTER          43.96N 92.40W
06/26/2010  E0.88 INCH       OLMSTED            MN   EMERGENCY MNGR

            WINDS ESTIMATED 40 TO 50 MPH

1121 PM     TSTM WND GST     3 W PLAINVIEW           44.17N 92.23W
06/26/2010  M50.00 MPH       WABASHA            MN   EMERGENCY MNGR

1121 PM     TSTM WND GST     2 SE EYOTA              43.97N 92.20W
06/26/2010  M60.00 MPH       OLMSTED            MN   MESONET

1122 PM     TSTM WND GST     EYOTA                   43.99N 92.23W
06/26/2010  M60.00 MPH       OLMSTED            MN   FIRE DEPT/RESCUE

1124 PM     TSTM WND GST     DOVER                   43.97N 92.13W
06/26/2010  M60.00 MPH       OLMSTED            MN   FIRE DEPT/RESCUE

1125 PM     TSTM WND GST     ST. CHARLES             43.97N 92.06W
06/26/2010  M50.00 MPH       WINONA             MN   FIRE DEPT/RESCUE

1147 PM     TSTM WND DMG     2 W MONEY CREEK         43.82N 91.66W
06/26/2010                   HOUSTON            MN   LAW ENFORCEMENT

            8 TREES DOWN ACROSS HIGHWAY 26 FROM THE MONEY CREEK AREA
            WEST TOWARD RUSHFORD.

1150 PM     TSTM WND DMG     2 ENE MONEY CREEK       43.83N 91.58W
06/26/2010                   HOUSTON            MN   LAW ENFORCEMENT

            TREES DOWN AND DEBRIS STREWN AROUND THE PROPERTY.
            TRANSFORMER ON FIRE. REPORTED ALONG HANSON VALLEY ROAD.

1154 PM     TSTM WND GST     1 E BLACK RIVER FALLS   44.30N 90.83W
06/26/2010  E60.00 MPH       JACKSON            WI   LAW ENFORCEMENT

1158 PM     TSTM WND GST     3 S RIDGEWAY            43.87N 91.57W
06/26/2010  M51.00 MPH       WINONA             MN   AMATEUR RADIO

1205 AM     TSTM WND DMG     1 N ONALASKA            43.90N 91.22W
06/27/2010                   LA CROSSE          WI   PUBLIC

            TWO AND A HALF FOOT DIAMETER TREE UPROOTED.

1205 AM     TSTM WND GST     3 S HOLMEN              43.91N 91.26W
06/27/2010  M62.00 MPH       LA CROSSE          WI   TRAINED SPOTTER

1208 AM     TSTM WND DMG     LA CROSSE               43.83N 91.23W
06/27/2010                   LA CROSSE          WI   LAW ENFORCEMENT

            TREE DOWN AT 13TH AND JACKSON STREETS.

1210 AM     TSTM WND GST     2 E LA CROSSE           43.83N 91.19W
06/27/2010  M53.00 MPH       LA CROSSE          WI   OFFICIAL NWS OBS

            AT THE NWS LA CROSSE OFFICE.

1221 AM     FLOOD            CHARLES CITY            43.07N 92.68W
06/27/2010                   FLOYD              IA   TRAINED SPOTTER

            FLOODED INTERSECTIONS AND ROADS IN CHARLES CITY.

1233 AM     TSTM WND GST     SPARTA                  43.94N 90.81W
06/27/2010  E50.00 MPH       MONROE             WI   TRAINED SPOTTER

            AT HIGHWAY 27 AND INTERSTATE 90.

1244 AM     TSTM WND DMG     TOMAH                   43.99N 90.50W
06/27/2010                   MONROE             WI   LAW ENFORCEMENT

            THREE TEN INCH BRANCHES DOWN.


Rainfall Totals from June 26-27, 2010

image showing radar estimated rainfall from June 26-67

Doppler radar rainfall estimates from June 26-27, 2010. (Click on image to enlarge)

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
930 AM CDT SUN JUN 27 2010

...24 HOUR RAINFALL TOTALS ACROSS THE AREA...

LOCATION                   RAINFALL    TIME     LAT/LON

IOWA

...ALLAMAKEE COUNTY...
WATERVILLE                 1.33        0900 AM
HARPERS FERRY              1.27        0700 AM  43.17N 91.24W
LANSING 4SE                1.19        0700 AM  43.32N 91.16W
DORCHESTER HIGHWAY 76      1.16        0700 AM  43.42N 91.51W
ION                        1.16        0700 AM  43.11N 91.27W

...CHICKASAW COUNTY...
IONIA-LITTLE CEDAR RVR     1.90        0700 AM  43.03N 92.50W
IONIA-COOP                 1.76        0700 AM  43.03N 92.50W

...CLAYTON COUNTY...
ELKADER 6SSW               1.06        0700 AM  42.79N 91.45W
ELKADER-TURKEY RVR         0.95        0700 AM  42.84N 91.40W
LITTLEPORT                 0.79        0700 AM  42.75N 91.37W
MARQUETTE                  0.77        0700 AM  43.04N 91.21W
EDGEWOOD                   0.70        0700 AM  42.65N 91.40W
GUTTENBERG DAM 10          0.65        0600 AM  42.79N 91.10W
MCGREGOR                   0.60        0700 AM  43.02N 91.17W
GARBER                     0.56        0700 AM  42.74N 91.26W

...FAYETTE COUNTY...
FAYETTE                    1.52        0700 AM  42.85N 91.82W
ELDORADO                   0.71        0700 AM  43.05N 91.81W

...FLOYD COUNTY...
COLWELL                    2.03        0700 AM  43.16N 92.59W
CHARLES CITY COOP          1.92        0700 AM  43.08N 92.67W
NASHUA ISU AG RESEARCH     1.34        0700 AM  42.94N 92.57W
CHARLES CITY AWOS          1.31        0700 AM  43.07N 92.61W
CHARLES CITY CEDAR RVR     1.16        0700 AM  43.06N 92.67W

...HOWARD...
RICEVILLE                  1.30        0700 AM

...MITCHELL COUNTY...
ST ANSGAR                  1.42        0600 AM  43.37N 92.83W

...WINNESHIEK COUNTY...
DECORAH-UPPER IOWA RVR     1.71        0700 AM  43.30N 91.80W
CALMAR                     1.53        0700 AM  43.18N 91.87W
DECORAH 8ENE               1.46        0700 AM
DECORAH AWOS               1.41        0700 AM  43.28N 91.74W
BLUFFTON                   1.23        0700 AM  43.41N 91.90W

MINNESOTA

...DODGE COUNTY...
MANTORVILLE                1.05        0700 AM  44.07N 92.77W
DODGE CENTER AWOS          0.97        0700 AM  44.03N 92.83W

...FILLMORE COUNTY...
PRESTON                    0.96        0800 AM
LANESBORO                  0.93        0700 AM  43.72N 91.97W
CARIMONA                   0.93        0700 AM  43.66N 92.15W
SPRING VALLEY 3E           0.92        0700 AM  43.68N 92.33W
SPRING VALLEY 1 NW         0.87        0700 AM  43.70N 92.40W
SPRING VALLEY              0.86        0700 AM  43.69N 92.39W
LANESBORO-ROOT RVR         0.80        0700 AM  43.72N 91.97W
PILOT MOUND                0.65        0700 AM  43.78N 92.03W

...HOUSTON COUNTY...
SPRING GROVE 4N            1.07        0700 AM  43.61N 91.62W
CALEDONIA 1 NW             1.03        0700 AM  43.62N 91.48W
CALEDONIA 6S               0.96        0700 AM
HOUSTON                    0.83        0700 AM  43.77N 91.57W
BROWNSVILLE                0.82        0700 AM  43.70N 91.27W
MOUND PRAIRIE              0.71        0700 AM  43.78N 91.45W
DAKOTA 5NW                 0.63        0630 AM

...MOWER COUNTY...
LANSING                    0.78        0700 AM  43.75N 92.95W
AUSTIN-TURTLE CREEK        0.65        0700 AM  43.67N 92.95W
AUSTIN-DOBBINS CREEK       0.63        0700 AM  43.67N 92.95W
AUSTIN 3S                  0.58        0700 AM  43.62N 93.00W

...OLMSTED COUNTY...
ROCHESTER - BEAR CREEK     1.16        0700 AM  43.92N 92.48W
ROCHESTER - CASCADE CREEK  1.14        0700 AM  44.03N 92.48W
DOVER                      1.13        0700 AM  44.01N 92.11W
ROCHESTER BELTLINE         1.12        0700 AM  43.91N 92.50W
ROCHESTER INTL AP          1.10        0700 AM  43.91N 92.50W
ROCHESTER - SILVER CREEK   1.06        0700 AM  44.03N 92.42W
ELBA                       0.83        0700 AM  44.05N 92.05W
ROCHESTER MAPLE VALLEY     0.79        0700 AM  44.02N 92.42W

...WABASHA COUNTY...
WABASHA                    1.38        0700 AM  44.39N 92.05W
LAKE CITY COOP             1.38        0700 AM  44.43N 92.28W
KELLOGG                    1.01        0700 AM  44.32N 92.00W
THEILMAN                   0.79        0700 AM  44.28N 92.19W

...WINONA COUNTY...
WINONA DAM 5A              0.82        0600 AM  44.09N 91.67W
ALTURA                     0.59        0700 AM  44.15N 92.01W
LA CRESCENT DAM 7          0.54        0700 AM  43.87N 91.31W
MINNESOTA CITY             0.51        0700 AM  44.16N 91.81W
DAKOTA                     0.26        0700 AM  43.92N 91.37W

WISCONSIN

...ADAMS COUNTY...
FRIENDSHIP                 1.77        0700 AM  43.98N 89.83W

...BUFFALO COUNTY...
MONDOVI-MIRROR LAKE        2.46        0700 AM  44.56N 91.67W
MONDOVI 6S                 1.92        0700 AM  44.48N 91.67W
ALMA DAM 4                 0.64        0600 AM  44.33N 91.92W

...CLARK COUNTY...
NEILLSVILLE                0.98        0700 AM  44.56N 90.61W
NEILLSVILLE 3SW            0.93        0700 AM  44.53N 90.64W
OWEN                       0.46        0700 AM  44.98N 90.55W

...CRAWFORD COUNTY...
FERRYVILLE 3WSW            1.22        0800 AM
LYNXVILLE DAM 9            1.15        0600 AM  43.21N 91.10W
GAYSMILLS                  1.02        0800 AM
STEUBEN                    0.91        0700 AM  43.18N 90.87W
SOLDIERS GROVE             0.79        0700 AM  43.39N 90.78W
PRAIRIE DU CHIEN AWOS      0.41        0700 AM  43.30N 89.76W

...GRANT COUNTY...
BOSCOBEL ASOS              0.78        0700 AM  43.16N 90.68W
SINSINAWA                  0.54        0700 AM  42.52N 90.54W
LANCASTER                  0.51        0700 AM
ROCKVILLE                  0.41        0700 AM  42.73N 90.64W

...JACKSON COUNTY...
BLACK RIVER FALLS STP      1.55        0700 AM  44.29N 90.85W
TAYLOR                     1.05        0700 AM  44.32N 91.12W

...JUNEAU COUNTY...
NECEDAH 2SE                0.96        0700 AM  44.00N 90.04W
CAMP DOUGLAS               0.58        0700 AM  43.94N 90.26W
NECEDAH 1W                 0.46        0700 AM  44.02N 90.08W
NECEDAH 5WNW               0.33        0700 AM  44.06N 90.17W

...LA CROSSE COUNTY...
LA CROSSE 5SE              0.92        0700 AM  43.77N 91.15W
LA CROSSE WEATHER OFFICE   0.58        0700 AM  43.82N 91.19W
HOLLAND                    0.55        0700 AM  43.97N 91.29W
HOLMEN 2S                  0.53        0700 AM  43.93N 91.25W
HOLMEN                     0.52        0700 AM  43.97N 91.27W
LA CROSSE-MISSISSIPPI RVR  0.54        0700 AM  43.80N 91.37W
WEST SALEM 1W              0.47        0700 AM  43.90N 91.09W
LA CROSSE ASOS             0.43        0700 AM  43.88N 91.26W

...MONROE COUNTY...
WARRENS                    0.60        0700 AM  44.10N 90.59W
TUNNEL CITY                0.50        0700 AM  44.01N 90.57W
FOUR CORNERS               0.40        0700 AM  44.07N 90.92W
SPARTA AWOS                0.29        0700 AM  43.96N 90.74W

...RICHLAND COUNTY...
RICHLAND CENTER 1NW        0.62        0700 AM  43.36N 90.42W
RICHLAND CENTER            0.59        0700 AM  43.32N 90.38W

...TAYLOR COUNTY...
GAD 6E                     0.72        0700 AM  45.14N 90.20W
MEDFORD                    0.63        0700 AM  45.13N 90.34W
JUMP RIVER                 0.42        0700 AM
...TREMPEALEAU COUNTY...

OSSEO                      1.88        0700 AM  44.58N 91.22W
GALESVILLE 2ESE            0.64        0700 AM  44.08N 91.34W
TREMPEALEAU DAM 6          0.45        0600 AM  44.00N 91.44W

...VERNON COUNTY...
LIBERTY POLE 2SW           0.99        0700 AM  43.49N 90.95W
DESOTO 1SE                 0.98        0700 AM  43.41N 91.19W
VIROQUA                    0.96        0700 AM  43.55N 90.90W
READSTOWN                  0.89        0700 AM  43.45N 90.76W
VIROQUA 3ESE               0.83        0700 AM  43.55N 90.82W
COON VALLEY 6S             0.83        0700 AM  43.61N 91.01W
WESTBY 3SE                 0.79        0700 AM  43.62N 90.82W
VIROQUA 4WSW               0.78        0700 AM  43.54N 90.96W
GENOA DAM8                 0.77        0700 AM  43.57N 91.23W
LA FARGE                   0.98        0700 AM  43.57N 90.64W
LA FARGE-KICKAPOO RVR      0.75        0700 AM  43.57N 90.64W
VALLEY 1NW                 0.75        0730 AM
WESTBY 2NNE                0.74        0700 AM  43.70N 90.85W
WESTBY 3ENE                0.69        0700 AM  43.68N 90.81W
ONTARIO-KICKAPOO RVR       0.64        0700 AM  43.72N 90.59W
HILLSBORO                  0.58        0700 AM  43.65N 90.33W

OBSERVATIONS ARE COLLECTED FROM A VARIETY OF SOURCES WITH VARYING
EQUIPMENT AND EXPOSURE. NOT ALL DATA LISTED IS CONSIDERED OFFICIAL.

FOR THIS...AND A WEALTH OF OTHER RIVER AND WEATHER INFORMATION...
VISIT OUR WEBSITE AT  WEATHER.GOV/LACROSSE


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