Funnel clouds formed as cumulus clouds developed along the lake breeze.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GRB wrote it up.
Funnel clouds formed as cumulus clouds developed along the lake breeze.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Green Bay, WI wrote its last area forecast discussion before the first event at Aug 8, 1:18 PM CST, 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 218 PM CDT MON AUG 8 2011 .SHORT TERM...TONIGHT AND TUESDAY. LATEST RUC ANALYSIS AND SATELLITE/RADAR IMAGERY SHOW A SHORTWAVE TROUGH ABOUT TO MOVE OVER THE WISCONSIN/ILLINOIS BORDER THIS AFTERNOON. WEAK MID-LEVEL MOISTURE ADVECTION...WEAK SURFACE CONVERGENCE...AND AN UNCAPPED ATMOSPHERE ARE LEADING TO ISOLATED SHOWER DEVELOPMENT ACROSS MUCH OF THE FORECAST AREA. GREATER COVERAGE OF SHOWERS TIED TO THE SHORTWAVE ARE ALSO PUSHING NE INTO EAST-CENTRAL WISCONSIN. UPSTREAM...A COLD FRONT IS SHIFTING EAST OVER MINNESOTA AND GENERATING STORMS THAT ARE PASSING INTO THE ARROWHEAD. INSTABILITY HAS BEEN BUILDING AHEAD OF THE FRONT AND ANTICIPATE STORMS WILL BECOME STRONGER THROUGH THE REST OF THE AFTERNOON. AS THE FEATURES MOVE EAST...PRECIP AND SEVERE WEATHER CHANCES ARE THE MAIN FORECAST CONCERNS. TONIGHT...SHORTWAVE TROUGH MOVING OVER SOUTHERN WISCONSIN AND NORTHERN ILLINOIS WILL MOVE TO THE EAST IN THE EVENING. WEAK FORCING FROM THIS WAVE...MID-LEVEL MOISTURE ADVECTION...AND SURFACE CONVERGENCE WILL LEAD TO A CONTINUED CHANCE OF ISOLATED SHOWER ACTIVITY OVER FAR NE WISCONSIN AND E-C WISCONSIN FOR A COUPLE HOURS IN THE EVENING. MEANWHILE...COLD FRONT OVER THE NORTHERN PLAINS WILL MOVE TO THE EAST INTO N-C WISCONSIN BY MIDNIGHT AND NORTHEAST WISCONSIN BY SUNRISE. STRONG CONVECTION IS POSSIBLE ALONG THE FRONT LATER THIS AFTERNOON AND EARLY THIS EVENING THANKS TO 1500 J/KG OF ML CAPE PROJECTED OVER NE MINNESOTA AND NW WISCONSIN. INSTABILITY WILL BE WEAKENING WITH LOSS OF DAYTIME HEATING BUT NOT OUT OF THE QUESTION THAT A STRONG STORM WILL MAKE A RUN AT N-C WISCONSIN THIS EVENING. WILL ADD IT TO THE HWO. SHOWERS AND STORMS WILL BE DIMINISHING AS THEY HEAD TO THE EAST OVERNIGHT. BETTER CHANCES WILL BE ACROSS THE NORTH. LOWS FROM THE UPPER 50S NORTH TO MID 60S SOUTH. TUESDAY...SURFACE COOL FRONT WILL STILL HAVE TO PASS ACROSS NE WISCONSIN DURING THE MORNING...BUT THE 850 AND 700MB FRONT WILL HAVE ALREADY PASSED TO THE EAST...SO THINK PRECIP CHANCES WILL HAVE MOSTLY CONCLUDED BY 12Z. BUT WILL LEAVE A SLIGHT CHANCE ALONG THE LAKE MICHIGAN SHORELINE JUST IN CASE ITS A TAD SLOWER THAN PROGGED. THEREAFTER...STRATO-CU DECK OVER NORTH DAKOTA WILL CONTINUE TO SHIFT SE ACROSS THE FORECAST AREA. INCREASING LOW LEVEL LAPSE RATES AND LOW LEVEL MOISTURE WILL LEAD TO A BKN-OVC CLOUD SHIELD OVER N-C WISCONSIN...AND AT LEAST SCT OVER CENTRAL AND NORTHEAST WISCONSIN. ISOLATED SHOWERS ARE ALSO POSSIBLE ONCE THE STRATO-CU DECK ARRIVES...BETTER CHANCES OVER N-C WISCONSIN. DO NOT FIGURE N-C WISCONSIN WILL WARM UP TOO MUCH FROM THE OVERNIGHT LOWS WITH CLOUDS ARRIVING IN THE MORNING. HIGHS IN THE UPPER 60S NORTH TO UPPER 70S SE. .LONG TERM...WEDNESDAY THROUGH NEXT MONDAY. UPPER PATTERN WILL CONTINUE TO BE CHARACTERIZED BY GENERAL RIDGING IN THE WEST AND TROF IN THE EASTERN PART OF NOAM. NEXT SHORTWV TROF TO RIDE ALONG THE WNW FLOW WILL AFFECT AREA FRIDAY-SATURDAY. VERY GOOD AGREEMENT BETWEEN LATEST 08/12Z MODEL RUNS AND MODEL/ENSEMBLE RUNS FROM 08/00Z WITH THIS NEXT FEATURE. BETWEEN WEDNESDAY AND FRIDAY...LITTLE CHANGE NEEDED TO FORECAST. WEAK SHORTWV RIDGING ON THURSDAY SHOULD MAKE FOR THE MILDEST DAY OF THE LONG TERM PERIOD. INCREASED POPS A BIT FOR THE LATE WEEK SYSTEM NOW THAT WE HAVE BETTER AGREEMENT AMONG THE MODELS. ENOUGH INSTABILITY SHOULD YIELD SCATTERED STORMS FRIDAY AFTERNOON. CLOUD COVER AND LOW HEIGHTS SHOULD KEEP MAX TEMPS ON THE COOL SIDE SATURDAY. IN GENERAL...LITTLE CHANGES NEEDED TO PREVIOUS FORECAST. && .AVIATION...ISOLATED SHOWERS POPPING HAVE MOST POTENTIAL TO IMPACT CENTRAL AND EAST-CENTRAL WISCONSIN TAF SITES THIS AFTERNOON...THOUGH WILL MAINTAIN PREVAILING VFR CONDITIONS. COLD FRONT MOVES OVER THE AREA TONIGHT. SOME SHOWERS AND STORMS ARE LIKELY TO REACH INTO RHI THIS EVENING. SOME MAY CONTAIN SMALL HAIL AND GUSTY WINDS. CHANCES OF SHOWERS AND STORMS DIMINISHES SOUTH AND EAST BUT HAVE TO LEAVE A CHANCE IN THE FORECAST. UPSTREAM OBS SUGGEST A FEW HOUR PERIOD OF MVFR CIGS ALONG AND BEHIND THE FRONT LATE THIS EVENING INTO THE OVERNIGHT BEFORE SOME CLEARING ARRIVES IN THE DRY SLOT. MVFR CLOUD DECK THEN SURGES SOUTHEAST OUT OF MINNESOTA TOMORROW MORNING WITH ONLY SLIGHTLY IMPROVING CIGS THROUGH THE DAY. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && MPC/JKL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 223 PM CDT MON AUG 8 2011 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-091930- VILAS-ONEIDA-FOREST-FLORENCE-NORTHERN MARINETTE-LINCOLN-LANGLADE- MENOMINEE-NORTHERN OCONTO-DOOR-MARATHON-SHAWANO-WOOD-PORTAGE- WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE-WAUSHARA-WINNEBAGO-CALUMET- MANITOWOC-SOUTHERN MARINETTE-SOUTHERN OCONTO- 223 PM CDT MON AUG 8 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TONIGHT THERE IS A CHANCE OF THUNDERSTORMS ACROSS ALL OF NORTH-CENTRAL AND NORTHEAST WISCONSIN WHEN A COLD FRONT PASSES ACROSS THE STATE. STRONG TO SEVERE STORMS ARE ANTICIPATED TO DEVELOP OVER NORTHWEST WISCONSIN LATER THIS AFTERNOON ALONG THE FRONT. AS STORMS WEAKEN AS THEY MOVE EAST THIS EVENING...AN ISOLATED SEVERE STORM WITH DAMAGING WINDS AND LARGE HAIL MAY REACH INTO FAR NORTH-CENTRAL WISCONSIN. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH MONDAY THE NEXT CHANCE FOR THUNDERSTORMS IS FRIDAY. IT IS TOO EARLY TO MAKE A MEANINGFUL ASSESSMENT ON THE POTENTIAL FOR SEVERE WEATHER. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED OVER FAR NORTH-CENTRAL WISCONSIN TONIGHT. LMZ521-522-541>543-091930- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 223 PM CDT MON AUG 8 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE MICHIGAN AND THE WATERS OF GREEN BAY. .DAY ONE...TONIGHT THERE IS A CHANCE FOR THUNDERSTORMS LATE TONIGHT. SEVERE STORMS ARE NOT EXPECTED. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH MONDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. MPC/JKL
The Green Bay radar (KGRB), 44 km away, was scanning. The volume nearest the first event began at 19:32 UTC.
2 funnel cloud. Local standard time, as filed.
A county sheriff saw two funnel clouds several miles north of Chilton. The funnels were also seen by the public from the village of Potter.
A well developed funnel cloud was videotaped by the public near Harrison.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2011Every state in 2011This day in weather historyWarnings in Wisconsin, August 2011
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 320289, 320295.