National Weather Service United States Department of Commerce

July 1-2, 2011 Preliminary Severe Weather Summary

 

Radar Imagery Damage Photos Damage Reports Rainfall Totals

Discussion about the event

During the early evening of July 1 around 7 pm, a line of showers and thunderstorms developed on a cold front over south central Minnesota and north central Iowa. Shortly thereafter, the storms over south central Minnesota began racing east ahead of the front, into the hot and humid airmass that was over the Upper Mississippi River Valley region.  The result from this was numerous reports of severe wind gusts as well as wind damage across much of southeast Minnesota into southwest into central Wisconsin. A few reports of wind damage were also received in northeast Iowa.  What was most interesting about this severe weather event was that even though the storms were weakening as they tracked east through the region, they still produced plenty of severe weather.  The cause of the weakening was a combination of temperatures cooling through the evening and the environment turning less favorable for storms to organize over Wisconsin.  Nevertheless, severe wind gusts and wind damage occurred into areas as far east as Sparta, Tomah, Necedah and Big Flats in the Upper Mississippi River Valley region.

Radar Imagery

Below are time radar time lapses of reflectivity (left) and velocity (right) along with the severe thunderstorm warnings (yellow boxes) from 721pm through 1225 am.  Caution!  These are large files and may take a while to download (~16MB). 

 

Radar reflectivity loop from 721 pm through 122 5am

KARX Reflectivity & Warnings(721pm-1225am)

Radar velocity time lapse from 721 pm through 1225 am

KARX Velocity & Warnings (721pm-1225am)

Damage photos

The following photos are courtesy of Mike McCaffrey, taken in Onalaska, WI

 

damage damage damage
damage damage damage

Storm Report Summary

The image below displays the warnings and severe weather reports that were received from the afternoon of July 1 into the early morning hours of July 2.

July 1-2, 2011 Servere Weather Reports & Warnings

The following is a summary of reports received into the National Weather Service in La Crosse as of 1046 am July 2nd:/p>

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

0847 PM TSTM WND GST HAYFIELD 43.89N 92.85W 07/01/2011 E50.00 MPH DODGE MN FIRE DEPT/RESCUE 0902 PM TSTM WND GST HAYFIELD 43.89N 92.85W 07/01/2011 E60.00 MPH DODGE MN AMATEUR RADIO 0909 PM TSTM WND GST 5 S ROCHESTER 43.94N 92.48W 07/01/2011 M58.00 MPH OLMSTED MN ASOS 0910 PM TSTM WND GST 3 SW PLAINVIEW 44.13N 92.21W 07/01/2011 M66.00 MPH WABASHA MN AMATEUR RADIO 0916 PM TSTM WND GST ELGIN 44.13N 92.25W 07/01/2011 M60.00 MPH WABASHA MN AMATEUR RADIO 0930 PM TSTM WND DMG AUSTIN 43.67N 92.97W 07/01/2011 MOWER MN BROADCAST MEDIA A COUPLE OF 6-8 INCH IN DIAMETER TREES DOWN ON SOUTHEAST SIDE OF TOWN. 0942 PM TSTM WND DMG LEWISTON 43.98N 91.87W 07/01/2011 WINONA MN LAW ENFORCEMENT TREE BLOWN DOWN 0942 PM TSTM WND GST 2 W SPRING VALLEY 43.69N 92.43W 07/01/2011 M55.00 MPH FILLMORE MN TRAINED SPOTTER 0945 PM TSTM WND GST 6 W STEWARTVILLE 43.86N 92.61W 07/01/2011 E50.00 MPH OLMSTED MN PUBLIC 0952 PM TSTM WND DMG NW WYKOFF 43.71N 92.27W 07/01/2011 FILLMORE MN LAW ENFORCEMENT LAW ENFORCEMENT REPORTED ROOF DAMAGE TO THE WYKOFF MIDDLE SCHOOL 0956 PM TSTM WND GST 2 SE EYOTA 43.97N 92.20W 07/01/2011 M63.00 MPH OLMSTED MN MESONET 0958 PM TSTM WND GST 5 W PRESTON 43.67N 92.18W 07/01/2011 M72.00 MPH FILLMORE MN AWOS 1002 PM TSTM WND DMG OSSEO 44.58N 91.22W 07/01/2011 TREMPEALEAU WI LAW ENFORCEMENT POWER LINES DOWN 1006 PM TSTM WND DMG 2 S LYLE 43.48N 92.94W 07/01/2011 MITCHELL IA LAW ENFORCEMENT LARGE TREE DOWN 1006 PM TSTM WND DMG 2 W ST. ANSGAR 43.38N 92.96W 07/01/2011 MITCHELL IA LAW ENFORCEMENT LARGE TREE DOWN 1006 PM HAIL 4 W OSAGE 43.28N 92.89W 07/01/2011 E0.50 INCH MITCHELL IA LAW ENFORCEMENT 1014 PM TSTM WND GST GALESVILLE 44.08N 91.36W 07/01/2011 E50.00 MPH TREMPEALEAU WI NWS EMPLOYEE 1015 PM TSTM WND GST 4 NW HOKAH 43.80N 91.41W 07/01/2011 M61.00 MPH HOUSTON MN CO-OP OBSERVER 1017 PM TSTM WND DMG OSAGE 43.28N 92.81W 07/01/2011 MITCHELL IA LAW ENFORCEMENT A FEW TREES BLOWN DOWN 1020 PM TSTM WND DMG ALMA CENTER 44.44N 90.91W 07/01/2011 JACKSON WI LAW ENFORCEMENT TREES AND POWER LINES DOWN. 1022 PM TSTM WND GST GRAND MEADOW 43.71N 92.57W 07/01/2011 E75.00 MPH MOWER MN BROADCAST MEDIA 1022 PM TSTM WND DMG DAKOTA 43.91N 91.36W 07/01/2011 WINONA MN LAW ENFORCEMENT TREE BLOWN DOWN 1022 PM TSTM WND DMG HOKAH 43.76N 91.35W 07/01/2011 HOUSTON MN EMERGENCY MNGR TREES DOWN IN TOWN 1027 PM TSTM WND DMG LA CRESCENT 43.83N 91.30W 07/01/2011 HOUSTON MN EMERGENCY MNGR TREES AND POWER LINES DOWN. 1030 PM TSTM WND DMG 3 N LA CROSSE 43.87N 91.23W 07/01/2011 LA CROSSE WI PUBLIC NUMEROUS TREES SNAPPED OFF AND UPROOTED ALONG THE SHORELINE OF LAKE ONALASKA. ESTIMATED WIND GUSTS OF 70 MPH. 1030 PM TSTM WND DMG LA CROSSE 43.83N 91.23W 07/01/2011 LA CROSSE WI LAW ENFORCEMENT TREE DOWN IN COPELAND PARK 1030 PM TSTM WND DMG ONALASKA 43.89N 91.22W 07/01/2011 LA CROSSE WI PUBLIC A COUPLE OF TREES AND SEVERAL LIMBS DOWN ON THE NORTHWEST SIDE OF TOWN. 1030 PM TSTM WND DMG ONALASKA 43.89N 91.22W 07/01/2011 LA CROSSE WI TRAINED SPOTTER 8-10 TREES UPROOTED ALONG WELL ST...BETWEEN OAK AVE AND 11TH AVE. A COUPLE TREES ALSO HAD THEIR TOPS SNAPPED OFF. 1031 PM TSTM WND GST 1 E LA CROSSE 43.83N 91.21W 07/01/2011 E49.00 MPH LA CROSSE WI MESONET 1033 PM TSTM WND GST 2 S LA CROSSE 43.80N 91.23W 07/01/2011 M56.00 MPH LA CROSSE WI AMATEUR RADIO SOME BRANCHES BLOWN OFF TREES. 1033 PM TSTM WND GST ONALASKA 43.89N 91.22W 07/01/2011 E60.00 MPH LA CROSSE WI TRAINED SPOTTER 1042 PM NON-TSTM WND GST 5 NNE STODDARD 43.73N 91.18W 07/01/2011 E50.00 MPH LA CROSSE WI NWS EMPLOYEE 1045 PM TSTM WND DMG 3 W NEILLSVILLE 44.56N 90.65W 07/01/2011 CLARK WI EMERGENCY MNGR TREE BLOWN DOWN ON VEHICLE. 1050 PM HAIL NORA SPRINGS 43.14N 93.01W 07/01/2011 E0.50 INCH FLOYD IA LAW ENFORCEMENT 1051 PM TSTM WND DMG 2 SE VEEFKIND 44.67N 90.36W 07/01/2011 CLARK WI TRAINED SPOTTER TRAINED SPOTTER REPORTED A TREE DOWN 1051 PM TSTM WND DMG 9 SSE RIPLINGER 44.71N 90.33W 07/01/2011 CLARK WI TRAINED SPOTTER TRAINED SPOTTER REPORTED METAL SHED SIDING AND ROOF DAMAGE 1055 PM TSTM WND GST 2 E LOYAL 44.74N 90.46W 07/01/2011 E55.00 MPH CLARK WI TRAINED SPOTTER 1055 PM TSTM WND DMG SPARTA 43.94N 90.81W 07/01/2011 MONROE WI EMERGENCY MNGR NUMEROUS TREE LIMBS DOWN AROUND TOWN AND ALSO SOME ROOF DAMAGE TO A FEW BUILDINGS. 1059 PM TSTM WND DMG SPARTA 43.94N 90.81W 07/01/2011 MONROE WI AMATEUR RADIO LARGE TREE BLOWN DOWN AND SOME ROOF DAMAGE TO BUILDING ON WATER STREET. 1136 PM LIGHTNING WINONA 44.05N 91.66W 07/01/2011 WINONA MN LAW ENFORCEMENT HOUSE STRUCK BY LIGHTNING 1140 PM TSTM WND DMG FINLEY 44.22N 90.13W 07/01/2011 JUNEAU WI BROADCAST MEDIA TREES DOWN ALONG HWY 80 AND COUNTY ROAD F 1142 PM TSTM WND GST 5 E NECEDAH 44.02N 89.97W 07/01/2011 M63.00 MPH ADAMS WI TRAINED SPOTTER 1145 PM TSTM WND DMG 1 N NECEDAH 44.04N 90.07W 07/01/2011 JUNEAU WI LAW ENFORCEMENT SEVERAL TREES DOWN ACROSS HIGHWAY 21 NORTH OF NECEDAH. 1152 PM TSTM WND GST BIG FLATS 44.12N 89.80W 07/01/2011 E60.00 MPH ADAMS WI PUBLIC

Rainfall Totals

The following is a listing of rainfall reports received into the National Weather Service in La Crosse between 7 am July 1st and 7 am July 2nd:

LOCATION                   RAINFALL    TIME     LAT/LON


NORTHEAST IOWA

...ALLAMAKEE COUNTY...
DORCHESTER HIGHWAY 76      0.13        0700 AM  43.42N 91.51W
ION                        0.02        0700 AM  43.11N 91.27W
HARPERS FERRY              0.01        0700 AM  43.17N 91.24W

...CHICKASAW COUNTY...
IONIA                      0.11        0700 AM  43.03N 92.50W

...CLAYTON COUNTY...
MARQUETTE                  0.08        0700 AM  43.04N 91.21W

...FAYETTE COUNTY...
FAYETTE                    0.04        0700 AM  42.85N 91.82W
OELWEIN AWOS               0.01        0700 AM  42.68N 91.97W
ELDORADO                   0.01        0700 AM  43.05N 91.81W

...FLOYD COUNTY...
COLWELL                    0.21        0700 AM  43.16N 92.59W
CHARLES CITY COOP          0.15        0700 AM  43.08N 92.67W
CHARLES CITY CEDAR RVR     0.11        0700 AM  43.06N 92.67W
NASHUA                     0.02        0700 AM  42.94N 92.57W
CHARLES CITY AWOS          0.01        0700 AM  43.07N 92.61W

...HOWARD COUNTY...
CRESCO                     0.52        0700 AM  43.37N 92.11W

...MITCHELL COUNTY...
OSAGE                      0.78        0700 AM  43.28N 92.81W
ST ANSGAR                  0.39        0700 AM  43.37N 92.83W

...WINNESHIEK COUNTY...
DECORAH                    0.29        0700 AM  43.30N 91.80W
DECORAH AWOS               0.13        0700 AM  43.28N 91.74W
BLUFFTON                   0.13        0700 AM  43.41N 91.90W

SOUTHEAST MINNESOTA

...DODGE COUNTY...
DODGE CENTER AWOS          0.50        0700 AM  44.03N 92.83W

...FILLMORE COUNTY...
CARIMONA                   0.35        0700 AM  43.66N 92.15W
SPRING VALLEY 3E           0.31        0700 AM  43.68N 92.33W
PRESTON AWOS               0.27        0700 AM  43.68N 92.18W
PILOT MOUND                0.26        0700 AM  43.78N 92.03W
LANESBORO                  0.13        0700 AM  43.72N 91.97W
PRESTON                    0.11        0700 AM  43.67N 92.07W

...HOUSTON COUNTY...
HOUSTON                    0.06        0700 AM  43.77N 91.57W
MOUND PRAIRIE              0.04        0700 AM  43.78N 91.45W

...MOWER COUNTY...
AUSTIN AWOS                1.01        0700 AM  43.67N 92.93W
AUSTIN                     0.93        0700 AM  43.67N 92.95W
GRAND MEADOW               0.79        0700 AM  43.71N 92.56W
AUSTIN 3S                  0.77        0700 AM  43.62N 93.00W
LANSING                    0.57        0700 AM  43.75N 92.95W

...OLMSTED COUNTY...
POST TOWN                  0.61        0700 AM  44.09N 92.82W
ROCHESTER - CASCADE CREEK  0.49        0700 AM  44.03N 92.48W
ROCHESTER BELTLINE         0.49        0700 AM  43.91N 92.50W
ROCHESTER - SILVER CREEK   0.48        0700 AM  44.03N 92.42W
ROCHESTER - BEAR CREEK     0.37        0700 AM  43.92N 92.48W
ROCHESTER ASOS             0.31        0700 AM
ELBA                       0.02        0700 AM  44.05N 92.05W

...WABASHA COUNTY...
WABASHA                    0.35        0700 AM  44.39N 92.05W
THEILMAN                   0.32        0700 AM  44.28N 92.19W
LAKE CITY COOP             0.28        0700 AM  44.43N 92.28W
KELLOGG                    0.23        0700 AM  44.32N 92.00W
LAKE CITY                  0.05        0700 AM  44.45N 92.26W

...WINONA COUNTY...
MINNESOTA CITY             0.31        0700 AM  44.16N 91.81W
WINONA                     0.30        0700 AM  44.09N 91.67W
ALTURA 5W                  0.27        0700 AM  44.06N 92.04W
ALTURA                     0.26        0700 AM  44.15N 92.01W
DAKOTA                     0.08        0700 AM  43.92N 91.37W
LA CRESCENT DAM 7          0.05        0700 AM  43.87N 91.31W

SOUTHWEST AND CENTRAL WISCONSIN

...BUFFALO COUNTY...
MONDOVI 6S                 0.37        0700 AM  44.48N 91.67W
ALMA DAM 4                 0.36        0700 AM  44.33N 91.92W

...CLARK COUNTY...
OWEN                       0.10        0700 AM  44.98N 90.55W
NEILLSVILLE 4 NNE          0.05        0700 AM  44.61N 90.56W
NEILLSVILLE                0.04        0700 AM  44.56N 90.61W

...CRAWFORD COUNTY...
LYNXVILLE DAM 9            0.02        0700 AM  43.21N 91.10W
PRAIRIE DU CHIEN AWOS      0.01        0700 AM  43.30N 89.76W
SOLDIERS GROVE               T         0700 AM  43.39N 90.78W

...JACKSON COUNTY...
TAYLOR                     0.43        0700 AM  44.32N 91.12W
BLACK RIVER FALLS          0.20        0700 AM  44.38N 90.84W
BLACK RIVER FALLS RAWS     0.19        0700 AM  44.30N 90.84W
MATHER 3NW                 0.03        0700 AM  44.17N 90.35W

...LA CROSSE COUNTY...
LA CROSSE WFO                T         0700 AM  43.82N 91.19W

...MONROE COUNTY...
WARRENS                    0.10        0700 AM  44.10N 90.59W
FOUR CORNERS               0.07        0700 AM  44.07N 90.92W
SPARTA                     0.04        0700 AM  43.94N 90.82W
TUNNEL CITY                  T         0700 AM  44.01N 90.57W

...TAYLOR COUNTY...
LUBLIN DIAMOND LAKE        0.26        0700 AM  45.11N 90.69W
MEDFORD 4NW                0.10        0700 AM  45.21N 90.36W
MEDFORD                    0.10        0700 AM  45.13N 90.34W

...TREMPEALEAU COUNTY...
BLAIR 2NW                  0.55        0700 AM  44.31N 91.27W
OSSEO                      0.33        0700 AM  44.58N 91.22W
GALESVILLE 2ESE            0.23        0700 AM  44.08N 91.34W
TREMPEALEAU DAM 6          0.19        0700 AM  44.00N 91.44W

...VERNON COUNTY...
DESOTO 1SE                 0.04        0700 AM  43.41N 91.19W
GENOA                      0.03        0700 AM  43.57N 91.23W

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