Heavy lake effect snow, gusty winds, and localized blizzard conditions will persist through Thanksgiving near and downwind of the Great Lakes. Rain and mountain snow are forecast for the Pacific Northwest. Confidence is increasing for another winter storm to develop over the northern and central Rockies Friday and track across the central Plains through the Midwest and Great Lakes this weekend. Read More >
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Flooding in Dane County and Delavan Tornado An unseasonably dynamic storm for August affected southern Wisconsin Monday, 8/20 into the morning of Tuesday, 8/21. Torrential rainfall was highest in and around Dane County (particularly west of Madison,WI), where several rainfall measurements exceeded the 10 inch mark. As a result, major flooding has been reported in this area. Across the rest of southern Wisconsin, rainfall reports generally ranged from one half to around two inches. In addition to the rainfall, there was one severe weather report, a brief tornado rated EF-0 was observed in Delavan, WI. |
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Tornadoes:
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Tornado - LOCATION
Track Map  
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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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Radar / Rainfall:
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Storm Total Rainfall Estimates |
Measured Rainfall Reports |
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| Madison Flooding | Madison Flooding | Madison Flooding | Store Flooding |
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| Madison Flooding | Highway 14 Flood Damage | Highway 14 Flood Damage | Shorewood Hills Damage |
Storm Reports
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 910 PM CDT TUE AUG 21 2018 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0800 AM HEAVY RAIN CROSS PLAINS 43.11N 89.65W 08/21/2018 M14.70 INCH DANE WI PUBLIC STORM TOTAL. 0920 AM HEAVY RAIN CROSS PLAINS 43.11N 89.64W 08/21/2018 M14.33 INCH DANE WI PUBLIC CORRECTS PREVIOUS HEAVY RAIN REPORT FROM CROSS PLAINS. 24 HOUR RAINFALL TOTAL. 0300 AM HEAVY RAIN 2 SSW MIDDLETON 43.07N 89.52W 08/21/2018 M13.40 INCH DANE WI PUBLIC DIGITAL TIPPING BUCKET GAUGE. 0816 AM HEAVY RAIN 4 SE CROSS PLAINS 43.07N 89.59W 08/21/2018 M12.97 INCH DANE WI PUBLIC 0900 AM HEAVY RAIN 1 SSE MIDDLETON 43.09N 89.50W 08/21/2018 M11.93 INCH DANE WI PUBLIC DIGITAL TIPPING BUCKET GAUGE. 0700 AM HEAVY RAIN 1 S MIDDLETON 43.09N 89.50W 08/21/2018 M11.63 INCH DANE WI COCORAHS 1034 PM HEAVY RAIN 3 W MIDDLETON 43.10N 89.56W 08/20/2018 M11.05 INCH DANE WI PUBLIC 0755 AM HEAVY RAIN 1 SW MIDDLETON 43.09N 89.52W 08/21/2018 M11.03 INCH DANE WI CO-OP OBSERVER MDDW3. 0800 AM HEAVY RAIN 4 NNE VERONA 43.04N 89.51W 08/21/2018 M11.02 INCH DANE WI COCORAHS WI-DA-63. 0700 AM HEAVY RAIN 6 WNW VERONA 43.03N 89.63W 08/21/2018 M10.47 INCH DANE WI COCORAHS WI-DA-49. 1200 PM HEAVY RAIN 3 SW SHOREWOOD HILLS 43.05N 89.48W 08/21/2018 M10.30 INCH DANE WI PUBLIC STORM TOTAL. 1100 PM HEAVY RAIN 2 S MIDDLETON 43.07N 89.51W 08/20/2018 M10.23 INCH DANE WI COCORAHS 0745 AM HEAVY RAIN 2 SW SHOREWOOD HILLS 43.06N 89.48W 08/21/2018 M9.62 INCH DANE WI CO-OP OBSERVER CHARMANY FARMS - CHMW3. 0700 AM HEAVY RAIN 4 SSW SHOREWOOD HILLS 43.03N 89.48W 08/21/2018 M9.58 INCH DANE WI COCORAHS WI-DA-3. 0637 AM HEAVY RAIN 3 SW SHOREWOOD HILLS 43.03N 89.47W 08/21/2018 M9.40 INCH DANE WI PUBLIC 0700 AM HEAVY RAIN 1 W SHOREWOOD HILLS 43.08N 89.47W 08/21/2018 M9.31 INCH DANE WI COCORAHS WI-DA-39. 0600 AM HEAVY RAIN 3 NE VERONA 43.02N 89.49W 08/21/2018 M9.20 INCH DANE WI PUBLIC 0800 AM HEAVY RAIN 3 NNW FITCHBURG 43.03N 89.45W 08/21/2018 M8.35 INCH DANE WI PUBLIC STORM TOTAL. 0700 AM HEAVY RAIN 1 SSW SHOREWOOD HILLS 43.06N 89.46W 08/21/2018 M8.05 INCH DANE WI COCORAHS WI-DA-13. 0705 AM HEAVY RAIN 1 SSW MIDDLETON 43.09N 89.51W 08/21/2018 M8.05 INCH DANE WI COCORAHS WI-DA-60. 0816 AM HEAVY RAIN MOUNT HOREB 43.01N 89.73W 08/21/2018 M7.24 INCH DANE WI CO-OP OBSERVER MRBW3. 0730 AM HEAVY RAIN 3 NNE VERONA 43.02N 89.51W 08/21/2018 M6.76 INCH DANE WI PUBLIC STORM TOTAL. 0700 AM HEAVY RAIN 3 NNE VERONA 43.03N 89.51W 08/21/2018 E6.76 INCH DANE WI COCORAHS 0630 AM HEAVY RAIN 1 N NEW GLARUS 42.83N 89.63W 08/21/2018 M5.92 INCH GREEN WI TRAINED SPOTTER 1030 AM HEAVY RAIN DEERFIELD 43.05N 89.08W 08/21/2018 M4.90 INCH DANE WI PUBLIC STORM TOTAL. 0800 AM HEAVY RAIN 3 N MAPLE BLUFF 43.16N 89.37W 08/21/2018 M4.84 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-35, 3 N MAPLE BLUFF. 0800 AM HEAVY RAIN 2 ENE MAPLE BLUFF 43.12N 89.32W 08/21/2018 M4.58 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-56, 2 ENE MAPLE BLUFF. 0700 AM HEAVY RAIN OREGON 42.92N 89.39W 08/21/2018 M4.24 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-33, OREGON. 1151 AM HEAVY RAIN 2 SW MADISON 43.06N 89.40W 08/21/2018 M4.23 INCH DANE WI PUBLIC AUTOMATED TIPPING BUCKET GAUGE....STORM TOTAL. 0800 AM HEAVY RAIN NEW GLARUS 42.81N 89.63W 08/21/2018 M4.23 INCH GREEN WI CO-OP OBSERVER NGLW3. 1030 AM HEAVY RAIN 1 S BROWN DEER 43.17N 87.98W 08/21/2018 M4.20 INCH MILWAUKEE WI TRAINED SPOTTER STORM TOTAL. 0730 AM HEAVY RAIN DEERFIELD 43.06N 89.07W 08/21/2018 M4.20 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-31, DEERFIELD. 0600 AM HEAVY RAIN 1 E MAPLE BLUFF 43.11N 89.35W 08/21/2018 M4.14 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-52, 1 E MAPLE BLUFF. 0700 AM HEAVY RAIN BARNEVELD 1 S 43.00N 89.89W 08/21/2018 M4.10 INCH IOWA WI CO-OP OBSERVER CO-OP OBSERVER STATION BLDW3, BARNEVELD 1 S. 0930 AM HEAVY RAIN 1 SSW SUN PRAIRIE 43.17N 89.24W 08/21/2018 M4.05 INCH DANE WI MESONET MESONET STATION E4463, 1 SSW SUN PRAIRIE. 0608 AM HEAVY RAIN SAUK CITY 43.26N 89.74W 08/21/2018 M4.05 INCH SAUK WI CO-OP OBSERVER CO-OP OBSERVER STATION SACW3, SAUK CITY. 0700 AM HEAVY RAIN BROOKLYN 42.86N 89.36W 08/21/2018 M4.02 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-44, BROOKLYN. 0830 AM HEAVY RAIN LONDON 43.05N 89.01W 08/21/2018 E4.00 INCH DANE WI PUBLIC STORM TOTAL. 0800 AM HEAVY RAIN PIPERSVILLE 43.14N 88.65W 08/21/2018 M4.00 INCH JEFFERSON WI PUBLIC STORM TOTAL. 0455 AM HEAVY RAIN OREGON 42.92N 89.39W 08/21/2018 M3.97 INCH DANE WI MESONET MESONET STATION C5917, OREGON. 0653 AM HEAVY RAIN MADISON-DANE COUNTY AIR 43.14N 89.34W 08/21/2018 M3.92 INCH DANE WI ASOS ASOS STATION MSN, MADISON-DANE COUNTY AIRPORT. 0820 AM HEAVY RAIN WINDSOR 43.22N 89.34W 08/21/2018 M3.91 INCH DANE WI TRAINED SPOTTER STORM TOTAL. 0700 AM HEAVY RAIN 4 SW DANE 43.20N 89.55W 08/21/2018 M3.70 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-62, 4 SW DANE. 0700 AM HEAVY RAIN 5 SE DODGEVILLE 42.91N 90.06W 08/21/2018 M3.56 INCH IOWA WI COCORAHS COCORAHS STATION WI-IW-3, 5 SE DODGEVILLE. 0700 AM HEAVY RAIN 3 WSW SUN PRAIRIE 43.17N 89.29W 08/21/2018 M3.56 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-65, 3 WSW SUN PRAIRIE. 0830 AM HEAVY RAIN BEAVER DAM 1 N 43.47N 88.84W 08/21/2018 M3.53 INCH DODGE WI CO-OP OBSERVER CO-OP OBSERVER STATION BDMW3, BEAVER DAM 1 N. 0700 AM HEAVY RAIN 1 SW BEAVER DAM 43.45N 88.85W 08/21/2018 M3.50 INCH DODGE WI COCORAHS COCORAHS STATION WI-DD-4, 1 SW BEAVER DAM. 0700 AM HEAVY RAIN BEAVER DAM 43.45N 88.85W 08/21/2018 M3.47 INCH DODGE WI CO-OP OBSERVER CO-OP OBSERVER STATION BEAW3, BEAVER DAM. 0700 AM HEAVY RAIN 1 ESE BELLEVILLE 42.85N 89.51W 08/21/2018 M3.43 INCH GREEN WI COCORAHS COCORAHS STATION WI-GN-7, 1 ESE BELLEVILLE. 0655 AM HEAVY RAIN DODGE COUNTY APT 43.43N 88.70W 08/21/2018 M3.37 INCH DODGE WI AWOS AWOS STATION UNU, DODGE COUNTY APT. 0700 AM HEAVY RAIN 1 W KEWASKUM 43.53N 88.27W 08/21/2018 M3.24 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-4, 1 W KEWASKUM. 0700 AM HEAVY RAIN WINDSOR 43.23N 89.35W 08/21/2018 M3.23 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-64, WINDSOR. 0700 AM HEAVY RAIN STOUGHTON 42.92N 89.22W 08/21/2018 M3.22 INCH DANE WI CO-OP OBSERVER CO-OP OBSERVER STATION STOW3, STOUGHTON. 0600 AM HEAVY RAIN COTTAGE GROVE 43.09N 89.22W 08/21/2018 M3.18 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-20, COTTAGE GROVE. 0631 AM HEAVY RAIN 1 ESE GERMANTOWN 43.23N 88.11W 08/21/2018 M3.16 INCH WASHINGTON WI TRAINED SPOTTER 0655 AM HEAVY RAIN ARGYLE 42.70N 89.02W 08/21/2018 M3.04 INCH ROCK WI CO-OP OBSERVER CO-OP OBSERVER STATION ARGW3, ARGYLE. 0600 AM HEAVY RAIN 3 SSW RICHRIELD 43.21N 88.21W 08/21/2018 M3.03 INCH WASHINGTON WI CO-OP OBSERVER CO-OP OBSERVER STATION RCHW3, 3 SSW RICHRIELD. 0700 AM HEAVY RAIN MCFARLAND 43.02N 89.28W 08/21/2018 M3.02 INCH DANE WI COCORAHS COCORAHS STATION WI-DA-14, MCFARLAND.
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