May 7th Severe Thunderstorm and Tornado Event (2024)

Tornadoes:

Tornado - Boone County, IL to Walworth County, WI Boone & McHenry Counties, IL and Walworth County, WI Date 5/7/2024 Time (Local) 2:05 PM - 2:25 PM CDT EF Rating EF-0 Est. Peak Winds 80 MPH Path Length 14.28 miles Max Width 50 yards Injuries/Deaths 0/0 Summary: Tornado developed in northern Illinois and tracked into Wisconsin, south of Walworth, before ending east of Walworth. The main structural damage was to a barn on the Illinois side near Weidner Rd where it collapsed and landed on a number of sheep that were sheltering there. Another shed was lofted and destroyed along Six Corners Rd near Highway 67. Track Map Downloadable KMZ File

Extensive damage to a sheep barn in far northern IL (McHenry Co) Metal roofing material peeled off top of a barn and lofted in adjacent field (Walworth Co) Sheet metal from a collapsed shed was lofted into a tree (Walworth Co) Top of large pine tree was displaced from its base (Walworth Co)

Tornado - Darien, WI Walworth County Date 5/7/2024 Time (Local) 2:18 PM - 2:21 PM CDT EF Rating EF-1 Est. Peak Winds 90 MPH Path Length 0.98 miles Max Width 50 yards Injuries/Deaths 0/0 Summary: Tornado was briefly on the ground south of Darien and hit a horse barn on Wise Rd. No injuries to farmers that were taking care of the horses at the time in the barn. Track Map Downloadable KMZ File

Large horse stable sustained extensive damage Roof of horse stable was blown off and walls collapsed Roof was blown off horse stable Sheet metal from the horse stable was lofted and dispersed around yard and up in a large tree

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

Hail / Rainfall:

During the second round of thunderstorms, numerous storms produced nickel to quarter size hail. Quarter size is 1" in diameter and is considered Severe level.

Hail stone next to a quarter for reference (about 1" diameter) Photo Credit: Chris O in Sussex	Hail stones approx. the size of a nickel or quarter (0.8 to 1.0" diameter) Photo Credit: Joe K in Mukwonago

This is the 24-hour precipitation from 7 AM Tuesday, May 7th through 7 AM May 8th. Some of the rainfall in this graphic includes the steady showers and thunderstorms that were rolling through eastern Wisconsin at the beginning of this time period. The amounts were generally between a half inch and 2 inches. The highest amounts occurred over south central and southeast Wisconsin where multiple rounds of storms occurred.

Tuesday, May 7th Estimated Rainfall Amounts

Storm Reports

Storm Reports

Preliminary Local Storm Report...SummaryNational Weather Service Milwaukee/Sullivan WI915 PM CDT Wed May 8 2024..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON.....DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS..0940 PM Flood 2 E Greenfield 42.96N 87.97W05/07/2024 Milwaukee WI 911 Call Center One lane blocked on I-43 at Loomis Rd due to high water. 0913 PM Tstm Wnd Gst 1 NE Cudahy 42.95N 87.85W05/07/2024 E55 MPH Milwaukee WI Trained Spotter Trained spotter estimated wind speeds of 50-55 MPH in Cudahy. Time confirmed via radar data. 0910 PM Hail 1 NW Saint Francis 42.98N 87.89W05/07/2024 M0.75 Inch Milwaukee WI Public Report from mPING: Dime (0.75 in.). 0909 PM Hail 1 NW Cedarburg 43.31N 88.00W05/07/2024 M1.00 Inch Ozaukee WI Public Report from mPING: Quarter (1.00 in.). 0908 PM Hail Grafton 43.32N 87.96W05/07/2024 E0.75 Inch Ozaukee WI Public Report from mPING: Dime (0.75 in.). 0908 PM Hail Grafton 43.32N 87.96W05/07/2024 E0.75 Inch Ozaukee WI Public Report from mPING: Dime (0.75 in.). 0906 PM Tstm Wnd Gst 2 W Cudahy 42.95N 87.90W05/07/2024 M56 MPH Milwaukee WI ASOS General Mitchell International Airport KMKE. Peak wind gust measured. Pea to dime size hail also reported. 0905 PM Hail 1 E Greendale 42.93N 87.99W05/07/2024 E0.75 Inch Milwaukee WI Public Report from mPING: Dime (0.75 in.). 0904 PM Hail 1 E Greendale 42.93N 87.99W05/07/2024 E0.75 Inch Milwaukee WI Public Report from mPING: Dime (0.75 in.). 0904 PM Hail 1 E Greendale 42.93N 87.99W05/07/2024 E0.75 Inch Milwaukee WI Public Report from mPING: Dime (0.75 in.). 0903 PM Hail 1 NW Cedarburg 43.31N 88.00W05/07/2024 E0.75 Inch Ozaukee WI Public Report from mPING: Dime (0.75 in.). 0858 PM Tstm Wnd Dmg Menomonee Falls 43.17N 88.10W05/07/2024 Waukesha WI Emergency Mngr Several reports around town of trees, limbs and power lines down. Time est by radar. 0858 PM Hail 1 W Hales Corners 42.93N 88.07W05/07/2024 M0.75 Inch Waukesha WI Public Report from mPING: Dime (0.75 in.). 0855 PM Tstm Wnd Dmg Brookfield 43.06N 88.13W05/07/2024 Waukesha WI Emergency Mngr Multiple reports around town of trees, limbs and power lines down. Time est by radar. 0852 PM Hail 2 SE Waukesha 42.99N 88.21W05/07/2024 E0.75 Inch Waukesha WI Public Report from mPING: Dime (0.75 in.). 0852 PM Hail 2 SE Waukesha 42.99N 88.21W05/07/2024 E0.75 Inch Waukesha WI Public Report from mPING: Dime (0.75 in.). 0847 PM Funnel Cloud 2 NE Twin Lakes 42.55N 88.24W05/07/2024 Kenosha WI Public Public report of a funnel cloud 2 miles northeast of Twin Lakes. Report time confirmed via radar data. 0845 PM Tstm Wnd Dmg 2 W Bohners Lake 42.62N 88.33W05/07/2024 Walworth WI 911 Call Center Tree down at the Knob Road and Warren Road intersection. Time estimated by radar. 0845 PM Hail 1 S Mukwonago 42.85N 88.34W05/07/2024 E1.00 Inch Waukesha WI Public Report from mPING: Quarter (1.00 in.). 0841 PM Tstm Wnd Gst 3 ENE Waukesha 43.04N 88.19W05/07/2024 E55 MPH Waukesha WI NWS Employee Off-duty NWS meteorologist reports estimated 50-55 mph winds. Time estimated by radar. 0839 PM Tstm Wnd Dmg 2 ESE Lac La Belle 43.13N 88.49W05/07/2024 Waukesha WI Public Tree downed, damaging a vehicle. 0838 PM Hail Mukwonago 42.87N 88.34W05/07/2024 M1.00 Inch Waukesha WI Public Public report of nickel to quarter size hail in Mukwonago. Time estimated via radar. 0835 PM Tstm Wnd Dmg 3 NE Lake Geneva 42.62N 88.39W05/07/2024 Walworth WI 911 Call Center Time estimated by radar. Report of tree down along Sheridan Springs Road. 0829 PM Tstm Wnd Dmg 1 SE Delavan Lake 42.59N 88.60W05/07/2024 Walworth WI 911 Call Center Multiple reports of trees and power lines down between southern Delavan area and Geneva area. No specific address at this time. Time estimated from radar. 0825 PM Tstm Wnd Dmg 4 E Avalon 42.62N 88.79W05/07/2024 Rock WI Public Public report of broken tree limbs near the community of Avalon. 0825 PM Tstm Wnd Dmg Delavan 42.63N 88.63W05/07/2024 Walworth WI Public Time estimated by radar. Trees damage reported across Delavan. 0755 PM Funnel Cloud 1 NE Cambridge 43.02N 89.00W05/07/2024 Jefferson WI Public Jefferson County Emergency Manager reports funnel cloud. 0749 PM Hail Windsor 43.22N 89.34W05/07/2024 M0.75 Inch Dane WI Public Report from mPING: Dime (0.75 in.). 0741 PM Tstm Wnd Dmg 4 WSW Marshall 43.15N 89.15W05/07/2024 Dane WI 911 Call Center Report of wires down. Time estimated by radar. 0741 PM Tstm Wnd Dmg 4 ENE Sun Prairie 43.20N 89.17W05/07/2024 Dane WI 911 Call Center Report of wires down at Meadow Lane/County Rd VV. Time estimated by radar. 0700 PM Hail 1 W Mount Horeb 43.01N 89.74W05/07/2024 E1.00 Inch Dane WI Public Report from mPING: Quarter (1.00 in.). 0648 PM Hail 1 SW Oxford 43.77N 89.57W05/07/2024 M1.00 Inch Marquette WI Fire Dept/Rescue Dime to Quarter size hail. 0647 PM Tstm Wnd Dmg 1 NE Oxford 43.79N 89.56W05/07/2024 Marquette WI 911 Call Center Report of 2 trees down in Town of Oxford and 1 tree down in Village of Westfield. Time estimated from radar. 0639 PM Hail 2 SW Janesville 42.65N 89.04W05/07/2024 E0.75 Inch Rock WI Public Report from mPING: Dime (0.75 in.). 0633 PM Hail 1 SW Dodgeville 42.95N 90.14W05/07/2024 M1.00 Inch Iowa WI Public Some Quarter size, most nickel size. Also reported by Emergency Manager. 0613 PM Hail 2 S Cobb 42.94N 90.33W05/07/2024 M0.88 Inch Iowa WI Public 0344 PM Hail 2 SW Racine 42.71N 87.80W05/07/2024 E0.75 Inch Racine WI Public Report from mPING: Dime (0.75 in.). 0342 PM Hail 1 W South Milwaukee 42.91N 87.87W05/07/2024 E1.00 Inch Milwaukee WI Public Report from mPING: Quarter (1.00 in.). 0339 PM Hail 1 E Pleasant Prairie 42.55N 87.92W05/07/2024 E0.75 Inch Kenosha WI Public Report of dime sized hail relayed via mPING. Time confirmed using radar data. 0338 PM Hail 2 SW Pleasant Prairie 42.52N 87.95W05/07/2024 M1.00 Inch Kenosha WI Public Report from mPING: Quarter (1.00 in.). 0336 PM Hail 2 S Oak Creek 42.85N 87.90W05/07/2024 E1.00 Inch Milwaukee WI Public Report from mPING: Quarter (1.00 in.). 0332 PM Hail 1 E Oak Creek 42.87N 87.87W05/07/2024 E1.25 Inch Milwaukee WI Public Report from mPING: Half Dollar (1.25 in.). 0331 PM Hail Oak Creek 42.89N 87.91W05/07/2024 M1.50 Inch Milwaukee WI Public Picture with measurement shown on WISN 12. 0331 PM Hail 2 W Oak Creek 42.88N 87.93W05/07/2024 E0.75 Inch Milwaukee WI Public Report from mPING: Dime (0.75 in.). 0330 PM Hail 1 S South Milwaukee 42.90N 87.86W05/07/2024 M0.75 Inch Milwaukee WI Public Report of dime sized hail relayed via mPING. Time estimated from radar. 0330 PM Hail 1 S South Milwaukee 42.89N 87.86W05/07/2024 E1.00 Inch Milwaukee WI Public 0330 PM Hail South Milwaukee 42.91N 87.86W05/07/2024 E1.25 Inch Milwaukee WI Public Photos of hail provided via email. 0330 PM Hail South Milwaukee 42.91N 87.86W05/07/2024 M1.00 Inch Milwaukee WI Trained Spotter Photos of measured 1in hail from spotter on Facebook. 0330 PM Hail 1 S Oak Creek 42.87N 87.90W05/07/2024 E1.00 Inch Milwaukee WI Public Report from mPING: Quarter (1.00 in.). 0315 PM Hail Waterford 42.76N 88.22W05/07/2024 M0.75 Inch Racine WI Public Report from mPING: Dime (0.75 in.). 0307 PM Hail 1 SW Waterford 42.75N 88.23W05/07/2024 E0.75 Inch Racine WI Public Report from mPING: Dime (0.75 in.). 0307 PM Hail Waterford 42.76N 88.22W05/07/2024 E0.75 Inch Racine WI Public Report from mPING: Dime (0.75 in.). 0253 PM Tstm Wnd Gst 2 NW Burlington 42.69N 88.30W05/07/2024 M53 MPH Racine WI AWOS 0238 PM Tstm Wnd Dmg 1 W Como 42.61N 88.52W05/07/2024 Walworth WI Amateur Radio Photos and video relayed by amateur radio showing snapped trees and tree limbs near Prestwick Drive in the Geneva National Golf Community. Time estimated via radar. 0227 PM Hail 3 SE Hubertus 43.19N 88.20W05/07/2024 E0.75 Inch Washington WI Public Report from mPING: Dime (0.75 in.). 0224 PM Tstm Wnd Dmg Walworth 42.53N 88.60W05/07/2024 Walworth WI Emergency Mngr Semi rolled over near intersection of Hwy 67 and US 14. Power lines down in area of Walworth and Fontana. Time estimated from radar. 0224 PM Hail Sussex 43.14N 88.22W05/07/2024 M1.00 Inch Waukesha WI Public 0223 PM Tstm Wnd Dmg Walworth 42.53N 88.60W05/07/2024 Walworth WI Trained Spotter Large tree branch down and leaning power pole near intersection of Hwy 67 and County Rd B. 0221 PM Tornado 2 SSW Walworth 42.51N 88.61W05/07/2024 Walworth WI NWS Storm Survey NWS survey team confirmed an EF-0 with 80 mph winds across southern Walworth County from east of Sharon to west of Walworth. 0219 PM Tornado 1 SSW Darien 42.58N 88.72W05/07/2024 Walworth WI NWS Storm Survey NWS storm survey confirmed a short lived EF-1 with 90 mph winds south of Darien. 0218 PM Hail 1 W Pewaukee 43.09N 88.26W05/07/2024 E1.00 Inch Waukesha WI Public Report from mPING: Quarter (1.00 in.)

Rainfall Reports

Public Information StatementNational Weather Service Milwaukee/Sullivan WI249 PM CDT Wed May 8 2024...PRECIPITATION REPORTS...Location Amount Time/Date Provider ...Wisconsin......Columbia County...Lodi 1.37 in 0233 AM 05/08 AWS Pardeeville 0.75 in 0214 AM 05/08 RAWS Portage 0.64 in 0223 AM 05/08 CWOP ...Dane County...Windsor 1.71 in 0225 AM 05/08 CWOP Waunakee 1.55 in 0229 AM 05/08 CWOP DeForest 1.36 in 0230 AM 05/08 CWOP CAMBRIDGE 1.20 in 0215 AM 05/08 CWOP MIDDLETON 1.17 in 0225 AM 05/08 CWOP Monona 0.98 in 0228 AM 05/08 CWOP Cottage Grove 0.88 in 0225 AM 05/08 CWOP OREGON 0.88 in 0225 AM 05/08 CWOP Brooklyn 0.85 in 0141 AM 05/08 RAWS Deerfield 0.80 in 0224 AM 05/08 CWOP Belleville 0.74 in 0228 AM 05/08 CWOP Sun Prairie 0.73 in 0225 AM 05/08 CWOP Oregon 0.71 in 0230 AM 05/08 CWOP Madison-Dane County Airport 0.67 in 0214 AM 05/08 ASOS 4 SE Cross Plains 0.65 in 0222 AM 05/08 CWOP MAZOMANIE 0.58 in 0226 AM 05/08 CWOP ...Dodge County...Horicon 0.81 in 0130 AM 05/08 RAWS Beaver Dam 0.78 in 0225 AM 05/08 CWOP Watertown 4.3 ENE 0.73 in 0500 PM 05/07 COCORAHS Juneau 0.72 in 0215 AM 05/08 AWOS ...Fond du Lac County...Fond Du Lac Airport 0.94 in 0153 AM 05/08 ASOS Campbellsport 0.91 in 0215 AM 05/08 CWOP 1.8 E South Byron 0.91 in 1200 AM 05/08 COOP 1 ESE Fond Du Lac 0.62 in 0235 AM 05/08 AWS ...Green County...Monroe 0.67 in 0215 AM 05/08 AWOS ...Green Lake County...3 N Friesland 0.84 in 0230 AM 05/08 AWS Berlin 0.81 in 0235 AM 05/08 AWS ...Iowa County... Mineral Point 0.62 in 0215 AM 05/08 AWOS Dodgeville 0.55 in 0211 AM 05/08 RAWS ...Kenosha County...Burlington 6.2 SSW 2.02 in 0917 PM 05/07 COCORAHS 2 NNW Kenosha 1.39 in 0235 AM 05/08 AWS Kenosha-Water Pollution Cont 1.34 in 1200 AM 05/08 COOP Pleasant Prairie 1.33 in 0215 AM 05/08 CWOP Kenosha Airport 1.23 in 0153 AM 05/08 ASOS Kenosha 1.5 S 1.05 in 0508 PM 05/07 COCORAHS ...Lafayette County...Benton 0.82 in 0230 AM 05/08 CWOP ...Milwaukee County...Greendale 2.40 in 0227 AM 05/08 CWOP Oak Creek 1.90 in 0215 AM 05/08 CWOP 3 NNE Butler 1.70 in 0230 AM 05/08 AWS 1 S Milwaukee 1.67 in 0230 AM 05/08 AWS West Allis 1.57 in 0230 AM 05/08 CWOP Shorewood 0.6 NW 1.35 in 0800 PM 05/07 COCORAHS Milwaukee-Gen Mitchell Arpt 1.22 in 0152 AM 05/08 ASOS 1.9 SE South Milwaukee 1.17 in 1200 AM 05/08 UCOOP Brown Deer 1.16 in 0235 AM 05/08 AWS GLENDALE 1.08 in 0228 AM 05/08 CWOP ...Ozaukee County...Port Washington 1.73 in 0234 AM 05/08 AWS Cedarburg 1.61 in 0217 AM 05/08 CWOP Mequon 1.43 in 0225 AM 05/08 CWOP Grafton 1.21 in 0235 AM 05/08 AWS ...Racine County...Waterford 1.35 in 0145 AM 05/08 HADS Burlington 1.4 NE 1.28 in 0355 PM 05/07 COCORAHS Racine-Batten Airport 1.08 in 0153 AM 05/08 ASOS Burlington 1.02 in 0220 AM 05/08 CWOP Yorkville 0.85 in 0215 AM 05/08 CWOP Franksville 7.0 WNW 0.76 in 0430 PM 05/07 COCORAHS Wind Lake 0.52 in 0215 AM 05/08 CWOP ...Rock County...2 NNW Beloit 1.32 in 0230 AM 05/08 AWS Edgerton 0.92 in 0215 AM 05/08 CWOP ...Sauk County...Dells Baraboo 0.53 in 0215 AM 05/08 AWOS Rock Springs 0.53 in 0200 AM 05/08 HADS Lone Rock-Airport 0.50 in 0156 AM 05/08 ASOS ...Sheboygan County...Sheboygan 1.85 in 0229 AM 05/08 CWOP Howards Grove 1.66 in 0215 AM 05/08 CWOP Sheboygan-Airport 1.49 in 0153 AM 05/08 ASOS 1 NNW Sheboygan 1.34 in 0235 AM 05/08 AWS Random Lake 1.25 in 0230 AM 05/08 CWOP Plymouth 1.13 in 0230 AM 05/08 CWOP ...Walworth County...Pell Lake 1.91 in 0225 AM 05/08 CWOP East Troy 1.66 in 0225 AM 05/08 CWOP 1 SSE Lake Geneva 1.50 in 0235 AM 05/08 AWS Mukwonago 1.14 in 0225 AM 05/08 CWOP 8 SW Richfield 1.04 in 0230 AM 05/08 AWS Genoa City 1.00 in 0230 AM 05/08 AWS ...Washington County...JACKSON 2.01 in 0226 AM 05/08 CWOP Colgate 1.97 in 0215 AM 05/08 CWOP Newburg 1.71 in 0235 AM 05/08 AWS GERMANTOWN 1.52 in 0230 AM 05/08 CWOP Allenton 0.98 in 0230 AM 05/08 CWOP ...Waukesha County...Muskego 1.99 in 0228 AM 05/08 CWOP Waukesha 1.83 in 0225 AM 05/08 CWOP 2.7 S Muskego 1.79 in 0145 AM 05/08 HADS Delafield 1.75 in 0230 AM 05/08 CWOP Brookfield 1.55 in 0229 AM 05/08 CWOP Mukwonago 1.45 in 1224 AM 05/08 CWOP Eagle 1.37 in 0207 AM 05/08 RAWS 1 SSE Lannon 1.23 in 0230 AM 05/08 AWS Eagle 1.14 in 0225 AM 05/08 CWOP New Berlin 1.09 in 0227 AM 05/08 CWOP OKAUCHEE 0.94 in 0230 AM 05/08 CWOP 2 NNE Chenequa 0.93 in 0234 AM 05/08 AWS Oconomowoc 2.3 WSW 0.65 in 0500 PM 05/07 COCORAHS Observations are collected from a variety of sources with varyingequipment and exposures. We thank all volunteer weather observers for their dedication. Not all data listed are considered official.