Overview
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A complex thunderstorms brought severe weather and beneficial rainfall to portions of the Upper Mississippi River Valley and southwest Wisconsin on the evening on June 17, 2021. Two supercells in particular produced destructive hailstones up to the size of baseballs along a path from Le Sueur County in south central Minnesota eastward to Wabasha and Winona counties along the Mississippi River. Rainfall amounts were generally in the 1-3 inch range with a few higher amounts. Due to the very dry conditions present in the area, little in the way of flooding impacts were reported. |
.jpg) Very large hail in Buffalo City - Photo by Dave Timmons |
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| Rainfall Map from June 17 | Hail reports from the evening storms (view interactive map) | Radar imagery shows the two back-to-back supercells |
Large Hail - Radar Imagery and Photos:
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| A strongly rotating updraft, known as a mesocyclone (right panel above), was present in the mid-levels of the storm where hail production was maximized. | A cross section through the supercell updraft shows an area of lower reflectivity surrounded by higher values. This is a bounded weak echo region (BWER) and denotes a very strong updraft punching through the storm core. | A three body scatter spike (TBSS) was present from the surface all the way up to 40,000 ft in the storm. This feature shows up as very low correlation coefficient values (blue spike on left panel) down-radial of the storm. | At the surface, differential reflectivity (ZDR) in the areas of higher reflectivity showed a pronounced dropoff to around 0 dB (grey area in right panel). This denotes the presence of large hail, whereas rain would show up as higher values. |
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| Hail to the size of baseballs that fell near Kellogg, MN. (Brandon Ivey) | A collection of large hail stones that fell near Kellogg, MN. (Brandon Ivey) | Hail compared to a playing card, Buffalo City, WI. (Marie Livingston) | Hail that barely fits in one's palm that fell in Kellogg, MN. (Mary Bambenek) |
Rain Reports
LOCATION AMOUNT TIME/DATE LAT/LON ...IOWA... ...ALLAMAKEE COUNTY... LANSING 2.00 IN 0640 AM 06/18 43.36N/91.22W LANSING 4.1 NW 1.55 IN 0700 AM 06/18 43.40N/91.29W 2 SW HARPERS FERRY 1.50 IN 0641 AM 06/18 43.18N/91.17W WAUKON 0.8 S 1.22 IN 0635 AM 06/18 43.26N/91.47W MONONA 9.8 N 0.89 IN 0700 AM 06/18 43.19N/91.35W HARPERS FERRY 6.4 SSW 0.86 IN 0700 AM 06/18 43.11N/91.20W 3 SE WATERVILLE 0.80 IN 0907 AM 06/18 43.17N/91.24W 3 S DORCHESTER 0.57 IN 0900 AM 06/18 43.42N/91.51W POSTVILLE 5.5 NE 0.44 IN 0700 AM 06/18 43.14N/91.49W 5 SW WAUKON JCT 0.21 IN 0845 AM 06/18 43.11N/91.27W ...CHICKASAW COUNTY... JERICO 2.8 WSW 0.05 IN 0600 AM 06/18 43.17N/92.31W IONIA 2W 0.03 IN 0700 AM 06/18 43.03N/92.50W ...CLAYTON COUNTY... MCGREGOR 0.76 IN 0948 AM 06/18 43.02N/91.19W 1 WSW MARQUETTE 0.40 IN 0900 AM 06/18 43.04N/91.21W MONONA 0.27 IN 0949 AM 06/18 43.04N/91.39W GUTTENBERG DAM 10 0.24 IN 0600 AM 06/18 42.79N/91.10W GARBER 0.18 IN 0915 AM 06/18 42.74N/91.26W LITTLEPORT 0.14 IN 0945 AM 06/18 42.75N/91.37W ELKADER 6SSW 0.05 IN 0700 AM 06/18 42.78N/91.45W BIG SPRING FISH HATCHERY 0.02 IN 0900 AM 06/18 42.91N/91.47W ...FAYETTE COUNTY... ELDORADO 1E - TURKEY RIVER 0.11 IN 0945 AM 06/18 43.05N/91.81W FAYETTE T IN 0740 AM 06/18 42.88N/91.83W WAUCOMA 3.2 S T IN 0700 AM 06/18 43.01N/92.03W ...FLOYD COUNTY... NORA SPRINGS 2.4 SSE 0.06 IN 0700 AM 06/18 43.11N/92.99W CHARLES CITY 0.01 IN 0930 AM 06/18 43.06N/92.67W ...HOWARD COUNTY... 2 N CRESCO 0.20 IN 0654 AM 06/18 43.40N/92.12W 3 E ELMA 0.12 IN 0945 AM 06/18 43.25N/92.38W ELMA 0.08 IN 0700 AM 06/18 43.24N/92.44W RICEVILLE 0.03 IN 0947 AM 06/18 43.36N/92.48W SARATOGA 0.02 IN 0946 AM 06/18 43.35N/92.42W ...MITCHELL COUNTY... OSAGE 4.7 E 0.07 IN 0700 AM 06/18 43.28N/92.72W ST ANSGAR 0.06 IN 0630 AM 06/18 43.38N/92.92W OSAGE 0.05 IN 0700 AM 06/18 43.28N/92.81W ...WINNESHIEK COUNTY... DECORAH 4.9SE 1.12 IN 0700 AM 06/18 43.26N/91.70W 7 ENE DECORAH 0.65 IN 0813 AM 06/18 43.34N/91.64W DECORAH 0.24 IN 0845 AM 06/18 43.30N/91.80W SPILLVILLE 0.19 IN 0930 AM 06/18 43.21N/91.95W 1 ENE JACKSON JUNCTION 0.14 IN 0950 AM 06/18 43.11N/92.04W 1 ENE BLUFFTON 0.10 IN 0845 AM 06/18 43.41N/91.90W ...MINNESOTA... ...DODGE COUNTY... CLAREMONT 2.5 ESE 0.01 IN 0800 AM 06/18 44.04N/92.95W HAYFIELD 0.3 SSE 0.01 IN 0630 AM 06/18 43.89N/92.85W ...FILLMORE COUNTY... CHATFIELD 9.0 ESE 0.65 IN 0700 AM 06/18 43.79N/92.03W PRESTON 0.48 IN 0700 AM 06/18 43.67N/92.07W CHATFIELD 0.7 SW 0.38 IN 0700 AM 06/18 43.84N/92.20W PRESTON 3.2 NNE 0.34 IN 0600 AM 06/18 43.71N/92.05W 1 NNW FILLMORE 0.31 IN 0930 AM 06/18 43.76N/92.27W LANESBORO 0.26 IN 0930 AM 06/18 43.72N/91.98W MABEL 0.20 IN 0700 AM 06/18 43.52N/91.76W WYKOFF 3.1 NW 0.17 IN 0700 AM 06/18 43.74N/92.31W SPRING VALLEY 0.07 IN 0700 AM 06/18 43.69N/92.39W ...HOUSTON COUNTY... HOUSTON 6.9 E 1.81 IN 0730 AM 06/18 43.76N/91.43W 3 SSW FREEBURG 1.50 IN 0618 AM 06/18 43.57N/91.39W MOUND PRAIRIE 1.41 IN 0845 AM 06/18 43.78N/91.45W LA CRESCENT 5.4 SW 1.27 IN 0700 AM 06/18 43.78N/91.39W LA CRESCENT 0.7 N 1.09 IN 0730 AM 06/18 43.84N/91.30W LA CRESCENT 1.0 WSW 1.02 IN 0700 AM 06/18 43.83N/91.32W HOUSTON 1.01 IN 0948 AM 06/18 43.77N/91.58W 1 W LA CRESCENT 1.01 IN 0851 AM 06/18 43.83N/91.32W HOKAH 4 NW 0.92 IN 0700 AM 06/18 43.80N/91.43W CALEDONIA 0.76 IN 0700 AM 06/18 43.63N/91.50W MABEL 2.7 E 0.25 IN 0800 AM 06/18 43.51N/91.71W 4 SSE MOUND PRAIRIE 0.02 IN 0945 AM 06/18 43.72N/91.44W ...MOWER COUNTY... AUSTIN 1.9 ENE 0.13 IN 0800 AM 06/18 43.68N/92.94W AUSTIN 3 NW - TURTLE CREEK 0.10 IN 0930 AM 06/18 43.65N/92.98W OSTRANDER 5.1 WNW 0.08 IN 0700 AM 06/18 43.65N/92.52W AUSTIN 2.4 W 0.06 IN 0700 AM 06/18 43.67N/93.02W LANSING - CEDAR RIVER 0.05 IN 0930 AM 06/18 43.75N/92.96W AUSTIN 1.5 WSW 0.04 IN 0700 AM 06/18 43.67N/93.00W DOBBINS CREEK 0.03 IN 0930 AM 06/18 43.68N/92.94W AUSTIN WASTE WATER TREATMENT 0.02 IN 0700 AM 06/18 43.65N/92.97W ...OLMSTED COUNTY... SAINT CHARLES 7.6 NNW 0.50 IN 0623 AM 06/18 44.08N/92.10W ROCHESTER 0.29 IN 0943 AM 06/18 44.04N/92.44W 1 W CHESTER 0.22 IN 0630 AM 06/18 44.00N/92.38W ROCHESTER 0.19 IN 0947 AM 06/18 44.18N/92.41W ELBA 4.7 SW 0.19 IN 0800 AM 06/18 44.04N/92.09W ROCHESTER-BELTLINE BEAR CREE 0.13 IN 0930 AM 06/18 44.01N/92.45W ROCHESTER 4.7 ENE 0.13 IN 0800 AM 06/18 44.04N/92.39W ROCHESTER 0.12 IN 0943 AM 06/18 44.01N/92.49W ELGIN 2SSW 0.10 IN 0700 AM 06/18 44.10N/92.27W ROCHESTER 4.1 ENE 0.09 IN 0830 AM 06/18 44.04N/92.40W 3 ENE ROCHESTER 0.08 IN 0930 AM 06/18 44.03N/92.43W 5 WSW ROCHESTER 0.08 IN 0900 AM 06/18 43.98N/92.56W 3 W ROCHESTER 0.07 IN 0930 AM 06/18 44.02N/92.53W ROCHESTER 3.3 ENE 0.07 IN 0800 AM 06/18 44.04N/92.42W MAYO HELIPAD 0.06 IN 0935 AM 06/18 44.02N/92.48W ROCHESTER INTERNATIONAL AIRP 0.05 IN 0854 AM 06/18 43.90N/92.50W ROCHESTER-CASCADE CREEK 0.04 IN 0930 AM 06/18 44.03N/92.47W 1 W ORONOCO 0.04 IN 0930 AM 06/18 44.17N/92.55W ROCHESTER 2.0 NNE 0.04 IN 0700 AM 06/18 44.04N/92.47W 2 NE ROCHESTER 0.04 IN 0600 AM 06/18 44.04N/92.44W 2 W HIGH FOREST 0.03 IN 0700 AM 06/18 43.85N/92.59W ALTURA 0.01 IN 0950 AM 06/18 44.13N/92.58W ROCHESTER 0.01 IN 0945 AM 06/18 44.05N/92.45W 6 NNW GENOA 0.01 IN 0900 AM 06/18 44.19N/92.65W ROCHESTER 4.2 N 0.01 IN 0600 AM 06/18 44.08N/92.49W 2 NNW ROCHESTER T IN 0600 AM 06/18 44.05N/92.49W ...WABASHA COUNTY... 1 N KELLOGG 1.78 IN 0900 AM 06/18 44.32N/92.00W WABASHA 1.57 IN 0948 AM 06/18 44.30N/92.00W 2 ESE WABASHA 1.09 IN 0637 AM 06/18 44.36N/92.02W THEILMAN 1 SSW 1.03 IN 0730 AM 06/18 44.28N/92.19W PLAINVIEW 0.91 IN 0942 AM 06/18 44.17N/92.17W 1 N WABASHA 0.70 IN 0711 AM 06/18 44.38N/92.04W 0.9 N WABASHA 0.50 IN 0700 AM 06/18 44.38N/92.05W LAKE CITY 0.1 E 0.47 IN 0700 AM 06/18 44.44N/92.28W LAKE CITY 0.43 IN 0945 AM 06/18 44.44N/92.28W PLAINVIEW 0.23 IN 0949 AM 06/18 44.16N/92.17W ZUMBRO FALLS 3.5 SSW 0.20 IN 0600 AM 06/18 44.24N/92.46W 3 ESE MAZEPPA 0.09 IN 0930 AM 06/18 44.26N/92.49W 1 SSE KELLOGG 0.02 IN 0945 AM 06/18 44.28N/91.99W ...WINONA COUNTY... MINNESOTA CITY 1.1 SE 2.78 IN 0700 AM 06/18 44.08N/91.73W SUGAR LOAF/WINONA 2.74 IN 0700 AM 06/18 1 ESE WINONA 2.61 IN 0945 AM 06/18 44.04N/91.63W WINONA DAM 5A 2.60 IN 0800 AM 06/18 44.09N/91.67W WINONA 2.0 ESE 2.60 IN 0700 AM 06/18 44.04N/91.63W 4.2 N ROLLINGSTONE 2.60 IN 0700 AM 06/18 44.16N/91.81W WINONA 1.9 ESE 2.53 IN 0650 AM 06/18 44.04N/91.63W MINNEISKA 2.50 IN 0530 AM 06/18 44.19N/91.87W WINONA 1.3 SSW 2.45 IN 0700 AM 06/18 44.03N/91.68W WINONA 12.0 ESE 2.44 IN 0700 AM 06/18 43.99N/91.44W WINONA MUNICIPAL AIRPORT 2.25 IN 0935 AM 06/18 44.07N/91.70W STOCKTON 1.98 IN 0622 AM 06/18 44.03N/91.77W STOCKTON 1.2 W 1.93 IN 0553 AM 06/18 44.03N/91.79W BEAVER 1.81 IN 0845 AM 06/18 44.15N/92.00W 4 SW WINONA 1.79 IN 0700 AM 06/18 LA CRESCENT DAM 7 1.50 IN 0800 AM 06/18 43.87N/91.31W 3 NE NODINE 1.46 IN 0930 AM 06/18 43.94N/91.41W LEWISTON 0.2 NW 1.35 IN 0700 AM 06/18 43.99N/91.87W 1 WSW ELBA 1.07 IN 0945 AM 06/18 44.09N/92.03W WHITEWATER STATE PARK 0.96 IN 0930 AM 06/18 44.05N/92.05W 3 SW ELBA 0.76 IN 0930 AM 06/18 44.06N/92.05W SAINT CHARLES 0.38 IN 0950 AM 06/18 43.97N/92.06W DAKOTA 0.28 IN 0915 AM 06/18 43.91N/91.36W ...WISCONSIN... ...ADAMS COUNTY... OXFORD 4.6 WNW 0.98 IN 0600 AM 06/18 43.81N/89.65W NEKOOSA 8.0 SSE 0.92 IN 0700 AM 06/18 44.21N/89.85W OXFORD 4.0 W 0.77 IN 0700 AM 06/18 43.79N/89.64W 0.6 W FRIENDSHIP 0.62 IN 0700 AM 06/18 43.98N/89.83W FRIENDSHIP 6.4 NNE 0.62 IN 0700 AM 06/18 44.06N/89.79W GRAND MARSH 1.0 W 0.54 IN 0700 AM 06/18 43.89N/89.73W ...BUFFALO COUNTY... MONDOVI 12.1 SSE 0.32 IN 0619 AM 06/18 44.40N/91.60W DODGE 0.01 IN 0945 AM 06/18 44.13N/91.55W ...CLARK COUNTY... 1 NE SIDNEY 1.50 IN 0939 AM 06/18 44.56N/90.63W ...CRAWFORD COUNTY... 3 SW SOLDIERS GROVE 2.10 IN 0915 AM 06/18 43.36N/90.81W SOLDIERS GROVE 2.00 IN 0640 AM 06/18 43.40N/90.77W GAYS MILLS 1.0 NE 1.95 IN 0700 AM 06/18 43.33N/90.84W 1 S DE SOTO 1.37 IN 0535 AM 06/18 43.41N/91.19W STEUBEN 1.01 IN 0945 AM 06/18 43.18N/90.86W STEUBEN 4SE 1.01 IN 0700 AM 06/18 43.13N/90.84W EASTMAN 1.00 IN 0541 AM 06/18 43.17N/91.02W DE SOTO 0.98 IN 0946 AM 06/18 43.42N/91.19W 2.8 E HARPERS FERRY 0.90 IN 0800 AM 06/18 43.21N/91.10W EASTMAN 2.4 NNE 0.79 IN 0645 AM 06/18 43.20N/91.00W PRAIRIE DU CHIEN 1.4 N 0.55 IN 0700 AM 06/18 43.06N/91.14W PRAIRIE DU CHIEN AIRPORT 0.54 IN 0755 AM 06/18 43.02N/91.12W 0.6 NE PRAIRIE DU CHIEN 0.46 IN 0700 AM 06/18 43.05N/91.13W ...GRANT COUNTY... MUSCODA 0.5 WSW 1.40 IN 0839 AM 06/18 43.18N/90.44W BOSCOBEL 1.34 IN 0903 AM 06/18 43.15N/90.68W BOSCOBEL AIRPORT 1.30 IN 0853 AM 06/18 43.15N/90.68W FENNIMORE 0.88 IN 0950 AM 06/18 42.98N/90.66W LANCASTER 0.78 IN 0941 AM 06/18 42.83N/90.69W 4.3 W LANCASTER 0.76 IN 0800 AM 06/18 42.83N/90.79W BLOOMINGTON 0.70 IN 0638 AM 06/18 42.89N/90.92W BLOOMINGTON 3.5 N 0.55 IN 0643 AM 06/18 42.94N/90.92W PATCH GROVE 0.1 NNW 0.43 IN 0700 AM 06/18 42.94N/90.97W PLATTEVILLE 0.40 IN 0947 AM 06/18 42.74N/90.46W CASSVILLE 7.8 ENE 0.28 IN 0700 AM 06/18 42.75N/90.84W PLATTEVILLE 0.3 NE 0.17 IN 0700 AM 06/18 42.74N/90.47W PLATTEVILLE MUNICIPAL AIRPOR 0.07 IN 0935 AM 06/18 42.68N/90.43W MUSCODA 0.01 IN 0946 AM 06/18 43.19N/90.46W ...JACKSON COUNTY... MELROSE 3.6 W 1.28 IN 0700 AM 06/18 44.13N/91.07W HIXTON 0.50 IN 0944 AM 06/18 44.39N/91.01W MATHER 3NW 0.44 IN 0700 AM 06/18 44.17N/90.35W BLACK RIVER FALLS AREA AIRPO 0.17 IN 0935 AM 06/18 44.25N/90.85W BLACK RIVER FALLS 0.12 IN 0830 AM 06/18 44.29N/90.85W BLACK RIVER FALLS 1.7 NNE 0.11 IN 0700 AM 06/18 44.32N/90.83W 1 E BLACK RIVER FALLS 0.01 IN 0915 AM 06/18 44.30N/90.73W ...JUNEAU COUNTY... NEW LISBON 0.91 IN 0916 AM 06/18 43.87N/90.17W MAUSTON 0.85 IN 0947 AM 06/18 43.80N/90.07W 3 ESE LEMONWEIR 0.79 IN 0530 AM 06/18 43.77N/89.96W NECEDAH NWR RY DAM NECEDAH 5 0.68 IN 0910 AM 06/18 44.06N/90.17W NECEDAH 0.62 IN 0848 AM 06/18 44.03N/90.08W MAUSTON AIRPORT 0.61 IN 0935 AM 06/18 43.83N/90.13W 0.6 W NECEDAH 0.37 IN 0748 AM 06/18 44.02N/90.08W VOLK FIELD 0.29 IN 0856 AM 06/18 43.92N/90.27W ...LA CROSSE COUNTY... 5 NNE STODDARD 2.75 IN 0532 AM 06/18 43.73N/91.20W LA CROSSE 5.4 SE 2.06 IN 0800 AM 06/18 43.77N/91.17W LA CROSSE 4.4 SSE 1.95 IN 0700 AM 06/18 43.77N/91.21W ONALASKA 2N 1.93 IN 0700 AM 06/18 43.91N/91.23W HOLMEN 1.7 SSE 1.83 IN 0700 AM 06/18 43.93N/91.24W HOLMEN 2 S 1.83 IN 0700 AM 06/18 43.93N/91.25W COON VALLEY 4.5 NNW 1.68 IN 0700 AM 06/18 43.76N/91.06W LA CROSSE 4NNW 1.51 IN 0730 AM 06/18 43.87N/91.27W LA CROSSE REGIONAL AIRPORT 1.48 IN 0853 AM 06/18 43.88N/91.25W ONALASKA 0.6 SW 1.47 IN 0700 AM 06/18 43.88N/91.23W LA CROSSE 1.45 IN 0908 AM 06/18 43.82N/91.19W MINDORO 6.6 E 1.13 IN 0800 AM 06/18 44.04N/90.97W ...MONROE COUNTY... WILTON 4.2 E 1.40 IN 0700 AM 06/18 43.81N/90.44W KENDALL 1.30 IN 0930 AM 06/18 43.79N/90.37W SPARTA 0.6 NW 1.00 IN 0715 AM 06/18 43.95N/90.82W 3 WNW OAKDALE 0.99 IN 0849 AM 06/18 43.97N/90.44W 0.5 SW SPARTA 0.96 IN 0800 AM 06/18 43.94N/90.82W WARRENS 4.7 WSW 0.80 IN 0700 AM 06/18 44.10N/90.59W 2 E CATARACT 0.68 IN 0948 AM 06/18 44.09N/90.79W SPARTA/FORT MCCOY AIRPORT 0.01 IN 0935 AM 06/18 43.97N/90.73W ...RICHLAND COUNTY... RICHLAND CENTER 2.65 IN 0533 AM 06/18 43.34N/90.38W 1 SSE RICHLAND CENTER 1.79 IN 0949 AM 06/18 43.32N/90.38W RICHLAND CENTER 4.0 N 1.58 IN 0800 AM 06/18 43.40N/90.39W RICHLAND CENTER 4 N 1.58 IN 0700 AM 06/18 43.40N/90.39W ...TREMPEALEAU COUNTY... TREMPEALEAU 7.6 NNW 3.14 IN 0700 AM 06/18 44.11N/91.48W GALESVILLE 1.0 NE 2.95 IN 0600 AM 06/18 44.10N/91.34W GALESVILLE 2WSW 2.87 IN 0600 AM 06/18 44.07N/91.39W TREMPEALEAU DAM 6 2.60 IN 0800 AM 06/18 44.00N/91.44W GALESVILLE 4.7 E 2.19 IN 0646 AM 06/18 44.08N/91.26W TREMPEALEAU 2.13 IN 0947 AM 06/18 44.07N/91.51W 1 NW TREMPEALEAU 2.13 IN 0600 AM 06/18 44.03N/91.46W 2 N TREMPEALEAU 2.00 IN 0617 AM 06/18 44.04N/91.43W ETTRICK 4.0 WNW 1.75 IN 0745 AM 06/18 44.19N/91.34W ETTRICK 1.50 IN 0523 AM 06/18 44.17N/91.27W OSSEO 0.4 E 1.08 IN 0600 AM 06/18 44.58N/91.21W ...VERNON COUNTY... VIROQUA 0.8 ESE 2.28 IN 0700 AM 06/18 43.55N/90.87W LA FARGE 2.18 IN 0946 AM 06/18 43.60N/90.63W COON VALLEY 0.1 WSW 2.18 IN 0800 AM 06/18 43.70N/91.01W 1 N VIROQUA 2.00 IN 0530 AM 06/18 43.57N/90.89W ONTARIO 1.70 IN 0845 AM 06/18 43.72N/90.59W HILLSBORO 0.5 WSW 1.61 IN 0700 AM 06/18 43.65N/90.35W HILLSBORO 2 SW 1.52 IN 0700 AM 06/18 43.63N/90.38W 3 N VICTORY 1.33 IN 0943 AM 06/18 43.53N/91.22W GENOA DAM 8 1.30 IN 0600 AM 06/18 43.57N/91.23W OBSERVATIONS ARE COLLECTED FROM A VARIETY OF SOURCES WITH VARYING EQUIPMENT AND EXPOSURES. WE THANK ALL VOLUNTEER WEATHER OBSERVERS FOR THEIR DEDICATION. NOT ALL DATA LISTED ARE CONSIDERED OFFICIAL.
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