Overview
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Strong to severe thunderstorms rolled across the area from early afternoon through the late evening hours of Thursday, September 12th. The storms produced very heavy rainfall, resulting in flash flooding across portions of northeast Iowa and southwest Wisconsin, along with rises on many rivers and streams. In addition, strong to damaging winds accompanied some of the storms. EF-0 tornadoes touched down in rural Winneshiek County, Iowa just south of the town of Ossian, and in rural northwest Clayton County, Iowa southwest of Monona.
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 Radar loop from 1 to 7 p.m. (Sept.12) |
Tornadoes:
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Tornado - South of Ossian, IA
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Tornado - Southwest of Monona, IA
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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Wind:
Public Information Statement National Weather Service La Crosse WI 845 PM CDT Thu Sep 12 2019 ...HIGHEST WIND REPORTS TODAY... Location Speed Time/Date Lat/Lon Mayo Helipad 44 MPH 0316 PM 09/12 44.02N/92.48W 1 ENE Dexter 42 MPH 0135 PM 09/12 43.73N/92.68W Jct CR 7 I-90 Mile Post 226 38 MPH 0405 PM 09/12 43.96N/92.21W Oelwein Municipal Airport 37 MPH 0435 PM 09/12 42.67N/91.97W 2 ESE Canton 37 MPH 0430 PM 09/12 43.52N/91.89W Boscobel Airport 35 MPH 0646 PM 09/12 43.15N/90.68W Rochester International Airp 33 MPH 0412 PM 09/12 43.90N/92.50W Boscobel 31 MPH 0703 PM 09/12 43.15N/90.68W 2 E Kasson 30 MPH 1115 AM 09/12 44.02N/92.71W Austin Municipal Airport 29 MPH 0137 PM 09/12 43.67N/92.92W Decorah Municipal Airport 29 MPH 0455 PM 09/12 43.27N/91.72W 3 N Stewartville 29 MPH 0210 PM 09/12 43.90N/92.48W 5 NW Frankville 29 MPH 0532 PM 09/12 43.25N/91.70W Gilman 28 MPH 0635 PM 09/12 45.17N/90.82W St. Joseph 3W 27 MPH 0209 PM 09/12 43.78N/91.10W Lake City 27 MPH 0331 PM 09/12 44.32N/92.44W Lake City 26 MPH 0347 PM 09/12 44.45N/92.27W Riceville 26 MPH 0401 PM 09/12 43.40N/92.50W Charles City Airport 26 MPH 0355 PM 09/12 43.07N/92.62W Preston Airport 26 MPH 0419 PM 09/12 43.68N/92.17W La Crosse Regional Airport 26 MPH 0726 PM 09/12 43.88N/91.25W Medford Airport 26 MPH 0455 PM 09/12 45.10N/90.30W Platteville Municipal Airpor 26 MPH 0755 PM 09/12 42.68N/90.43W 1 E Ridgeway 26 MPH 0145 PM 09/12 43.91N/91.54W 2 E Cataract 25 MPH 0323 PM 09/12 44.09N/90.79W 3 NE Lublin 25 MPH 0714 PM 09/12 45.11N/90.69W Rochester 25 MPH 0130 PM 09/12 44.18N/92.41W Sparta/Fort McCoy Airport 25 MPH 0615 PM 09/12 43.97N/90.73W Dodge Center Airport 25 MPH 0316 PM 09/12 44.02N/92.82W Necedah 25 MPH 0748 PM 09/12 44.03N/90.08W Medford 24 MPH 0516 PM 09/12 45.30N/90.30W Winona Municipal Airport 24 MPH 0752 PM 09/12 44.07N/91.70W Volk Field 24 MPH 0621 PM 09/12 43.92N/90.27W Viroqua Municipal Airport 24 MPH 0535 PM 09/12 43.58N/90.90W 1 SW Mount Sterling 24 MPH 1006 AM 09/12 43.31N/90.94W 2 N Ionia 24 MPH 0420 PM 09/12 43.07N/92.46W Rochester 23 MPH 1149 AM 09/12 44.04N/92.44W Trempealeau 23 MPH 0755 PM 09/12 44.07N/91.51W Saratoga 23 MPH 0401 PM 09/12 43.35N/92.42W Prairie Du Chien Airport 23 MPH 0635 PM 09/12 43.02N/91.12W 1 E Black River Falls 22 MPH 0715 PM 09/12 44.30N/90.73W Rochester 22 MPH 1220 PM 09/12 44.05N/92.45W 1 SSE Kellogg 22 MPH 0610 PM 09/12 44.28N/91.99W Rochester 21 MPH 0446 PM 09/12 44.08N/92.52W La Crosse 20 MPH 0416 PM 09/12 43.77N/91.22W Hayfield 20 MPH 1117 AM 09/12 43.89N/92.85W Byron 20 MPH 0346 PM 09/12 44.04N/92.64W Byron 20 MPH 0834 PM 09/12 44.03N/92.66W Wabasha 20 MPH 0558 PM 09/12 44.30N/92.00W Black River Falls Area Airpo 20 MPH 0255 PM 09/12 44.25N/90.85W 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.
Flooding
Hydrographs
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| Grant River at Burton, WI | Kickapoo River at Steuben, WI | Cedar River at Lansing, MN | Dobbins Creek near Austin, MN |
Photos:
EF0 Tornado South of Ossian, IA in rural Winneshiek County, IA |
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| Damage to farm outbuilding (NWS La Crosse) |
Tree damage near the start of the tornado. Note tree is rotten, so it takes less wind to cause damage. (NWS La Crosse) |
Corn and building damage (NWS La Crosse) |
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EF0 Tornado in Rural Northwest Clayton County, IA |
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| Tree branches impaled through sidewalls of a nearby house. (NWS La Crosse) |
Tornado track through a cornfield. (NWS La Crosse) |
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Storm Reports
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LA CROSSE WI
714 PM CDT THU SEP 12 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0309 PM FLOOD AUSTIN 43.67N 92.97W
09/12/2019 MOWER MN LAW ENFORCEMENT
EXTENSIVE STREET FLOODING IN TOWN WITH
STRANDED MOTORISTS AND WATER ON PARTS OF
I-90.
0310 PM HEAVY RAIN 2 NW LYLE 43.53N 92.97W
09/12/2019 M2.50 INCH MOWER MN TRAINED SPOTTER
SINCE 130 PM.
0327 PM FLOOD AUSTIN 43.67N 92.97W
09/12/2019 MOWER MN LAW ENFORCEMENT
INTERSTATE 90 BETWEEN HWY 218 AND HWY 56
CLOSED DUE TO HIGH WATER.
0346 PM TSTM WND GST 3 SW CHESTER 43.46N 92.41W
09/12/2019 M54 MPH HOWARD IA STORM CHASER
VIA SPOTTERNETWORK.ORG.
0410 PM TSTM WND GST 4 S GREENLEAFTON 43.52N 92.22W
09/12/2019 M70 MPH FILLMORE MN TRAINED SPOTTER
0437 PM LIGHTNING ROLLINGSTONE 44.10N 91.82W
09/12/2019 WINONA MN EMERGENCY MNGR
HOUSE FIRE REPORTED BY LIGHTNING.
0454 PM TORNADO 3 SSE OSSIAN 43.11N 91.74W
09/12/2019 WINNESHIEK IA EMERGENCY MNGR
POSSIBLE TORNADO DAMAGE ABOUT 2.5 MILES
SOUTH SOUTHEAST OF OSSIAN.
0454 PM HEAVY RAIN LIME SPRINGS 43.45N 92.28W
09/12/2019 M2.40 INCH HOWARD IA BROADCAST MEDIA
FELL IN 45 MINUTES. RELAYED VIA MEDIA.
0455 PM TORNADO 2 SW OSSIAN 43.13N 91.79W
09/12/2019 WINNESHIEK IA FIRE DEPT/RESCUE
JUST SPOTTED ALONG HWY W14.
0500 PM FLOOD 3 ENE SARATOGA 43.39N 92.36W
09/12/2019 HOWARD IA PUBLIC
GRAVEL ROADS WASHED OUT AND WATER OVER
GRAVEL ROADS ON KENT AVENUE EAST OF
SARATOGA.
0509 PM TSTM WND DMG 3 SW ALTA VISTA 43.16N 92.46W
09/12/2019 CHICKASAW IA TRAINED SPOTTER
TRAINED SPOTTER REPORTED TOPS OF TREES BLOWN
DOWN ON ROADWAY SEVEN MILES EAST OF COLWELL.
0520 PM HEAVY RAIN AUSTIN 43.67N 92.97W
09/12/2019 M3.16 INCH MOWER MN PUBLIC
RAINFALL SINCE 7AM THURSDAY.
0534 PM HEAVY RAIN ST. ANSGAR 43.38N 92.92W
09/12/2019 M3.97 INCH MITCHELL IA CO-OP OBSERVER
0544 PM HEAVY RAIN 8 W CHATFIELD 43.84N 92.35W
09/12/2019 M3.10 INCH FILLMORE MN AMATEUR RADIO
0551 PM FLOOD ROSE CREEK 43.60N 92.83W
09/12/2019 MOWER MN BROADCAST MEDIA
WATER OVER ROAD IN VARIOUS SPOTS.
0555 PM FLOOD LA CROSSE 43.81N 91.25W
09/12/2019 LA CROSSE WI LAW ENFORCEMENT
STREET FLOODING REPORTED AROUND TOWN.
0604 PM TSTM WND GST CLAYTON CENTER 42.88N 91.32W
09/12/2019 E60 MPH CLAYTON IA 911 CALL CENTER
0619 PM HEAVY RAIN 8 ENE DECORAH 43.34N 91.64W
09/12/2019 M2.42 INCH WINNESHIEK IA PUBLIC
FELL WITHIN ONE HOUR. FIELD AND DITCH
FLOODING.
0644 PM HEAVY RAIN 1 SE PRAIRIE DU CHIEN 43.03N 91.13W
09/12/2019 M1.85 INCH CRAWFORD WI TRAINED SPOTTER
ONE HOUR RAINFALL TOTAL.
0653 PM FLASH FLOOD WOODMAN 43.09N 90.80W
09/12/2019 GRANT WI EMERGENCY MNGR
WASHOUTS AND MUDSLIDES REPORTED.
0653 PM FLASH FLOOD BLOOMINGTON 42.89N 90.93W
09/12/2019 GRANT WI EMERGENCY MNGR
WATER OVER ROADS IN BLOOMINGTON AREA.
Rain Reports
Public Information Statement National Weather Service La Crosse WI 953 PM CDT Thu Sep 12 2019 ...24 HOUR PRECIPITATION REPORTS... Location Amount Time/Date Lat/Lon ...Iowa... ...Allamakee County... 5 SW Waukon Jct 1.28 in 0815 PM 09/12 43.11N/91.27W ...Chickasaw County... Ionia 2W 2.96 in 0800 PM 09/12 43.03N/92.50W New Hampton 0.85 in 0935 PM 09/12 43.06N/92.32W ...Clayton County... Garber 4.37 in 0900 PM 09/12 42.74N/91.26W Mcgregor 4.03 in 0934 PM 09/12 43.02N/91.19W Monona 2.90 in 0934 PM 09/12 43.04N/91.39W Big Spring Fish Hatchery 2.46 in 0845 PM 09/12 42.91N/91.47W 1 WSW Marquette 1.01 in 0900 PM 09/12 43.04N/91.21W ...Fayette County... 3 ENE Randalia 1.10 in 0839 PM 09/12 42.88N/91.83W ...Floyd County... Charles City 0.59 in 0815 PM 09/12 43.06N/92.67W ...Howard County... Riceville 4.37 in 0932 PM 09/12 43.40N/92.50W ...Mitchell County... St.Ansgar 3.41 in 0926 PM 09/12 43.38N/92.92W ...Winneshiek County... Decorah Municipal Airport 1.81 in 0915 PM 09/12 43.27N/91.72W Decorah 1.43 in 0934 PM 09/12 43.30N/91.79W ...Minnesota... ...Dodge County... Hayfield 2.78 in 0927 PM 09/12 43.89N/92.85W ...Fillmore County... 5 WSW Cummingsville 3.51 in 0831 PM 09/12 43.85N/92.35W 2 S Pilot Mound 2.30 in 0900 PM 09/12 43.78N/92.03W Preston Airport 1.47 in 0916 PM 09/12 43.68N/92.17W ...Houston County... 1 NNE Houston 2.48 in 0800 PM 09/12 43.77N/91.57W Houston 1.80 in 0930 PM 09/12 43.79N/91.59W 1 SSE Brownsville 1.74 in 0830 PM 09/12 43.69N/91.27W Mound Prairie 1.60 in 0830 PM 09/12 43.78N/91.45W ...Mower County... Dobbins Creek 4.18 in 0745 PM 09/12 43.68N/92.94W Lansing - Cedar River 3.77 in 0745 PM 09/12 43.75N/92.96W Austin 3 NW - Turtle Creek 3.28 in 0800 PM 09/12 43.65N/92.98W ...Olmsted County... 5 WSW Rochester 2.97 in 0900 PM 09/12 43.98N/92.56W 3 W Rochester 2.86 in 0800 PM 09/12 44.02N/92.53W Rochester International Airp 2.58 in 0854 PM 09/12 43.90N/92.50W 6 NNW Genoa 2.50 in 0900 PM 09/12 44.19N/92.65W Mayo Helipad 2.46 in 0915 PM 09/12 44.02N/92.48W Elgin 5SE 2.30 in 0800 PM 09/12 44.08N/92.19W Byron 2.15 in 0930 PM 09/12 44.04N/92.64W 1 W Oronoco 1.98 in 0900 PM 09/12 44.17N/92.55W Byron 1.81 in 0934 PM 09/12 44.03N/92.66W Rochester 1.49 in 0930 PM 09/12 44.09N/92.49W Rochester 1.28 in 0931 PM 09/12 44.08N/92.52W Rochester 1.26 in 0931 PM 09/12 44.18N/92.41W Rochester 1.16 in 0930 PM 09/12 44.09N/92.51W Rochester 0.91 in 0930 PM 09/12 44.05N/92.45W ...Wabasha County... Wabasha 2.34 in 0933 PM 09/12 44.30N/92.00W Plainview 2.33 in 0930 PM 09/12 44.17N/92.17W Lake City 1.54 in 0931 PM 09/12 44.32N/92.44W ...Winona County... 3 SW Elba 3.79 in 0800 PM 09/12 44.06N/92.05W 1 WSW Elba 3.65 in 0800 PM 09/12 44.09N/92.03W Beaver 2.22 in 0845 PM 09/12 44.15N/92.00W 3 NE Nodine 2.21 in 0900 PM 09/12 43.94N/91.41W Dakota 1.73 in 0900 PM 09/12 43.91N/91.36W Saint Charles 1.04 in 0935 PM 09/12 43.97N/92.06W ...Wisconsin... ...Buffalo County... Cochrane 2.62 in 0934 PM 09/12 44.22N/91.83W Mondovi 1.16 in 0700 PM 09/12 44.56N/91.67W ...Crawford County... De Soto 2.44 in 0926 PM 09/12 43.42N/91.19W 1 SSE Prairie Du Chien 1.85 in 0644 PM 09/12 43.03N/91.13W ...Grant County... Boscobel Airport 4.22 in 0923 PM 09/12 43.15N/90.68W Boscobel 3.67 in 0903 PM 09/12 43.15N/90.68W Fennimore 2.23 in 0934 PM 09/12 42.98N/90.66W Platteville Municipal Airpor 2.20 in 0915 PM 09/12 42.68N/90.43W ...Jackson County... 1 E Black River Falls 1.37 in 0915 PM 09/12 44.30N/90.73W ...Juneau County... Mauston Airport 1.06 in 0915 PM 09/12 43.83N/90.13W Mauston 0.96 in 0932 PM 09/12 43.80N/90.07W Volk Field 0.65 in 0926 PM 09/12 43.92N/90.27W Necedah 1w 0.64 in 0848 PM 09/12 44.02N/90.08W ...La Crosse County... NWS La Crosse 1.77 in 0908 PM 09/12 43.82N/91.19W La Crosse Regional Airport 1.19 in 0925 PM 09/12 43.88N/91.25W ...Monroe County... Sparta/Fort McCoy Airport 1.36 in 0915 PM 09/12 43.97N/90.73W 2 E Cataract 1.30 in 0933 PM 09/12 44.09N/90.79W ...Richland County... 1 SSE Richland Center 2.27 in 0934 PM 09/12 43.32N/90.38W ...Taylor County... 3 NE Lublin 0.69 in 0914 PM 09/12 45.11N/90.69W Medford 0.59 in 0931 PM 09/12 45.30N/90.30W ...Trempealeau County... Trempealeau 1.71 in 0930 PM 09/12 44.07N/91.51W ...Vernon County... Viroqua Municipal Airport 1.31 in 0935 PM 09/12 43.58N/90.90W 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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