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.
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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
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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)
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| 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
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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
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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 &nbsnbsp; 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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