A funnel cloud formed under a weak thunderstorm in southern Manitowoc County.
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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.
A funnel cloud formed under a weak thunderstorm in southern Manitowoc County.
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 Jul 18, 2:22 AM CST, 11 hours 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 322 AM CDT SUN JUL 18 2010 .SHORT TERM...TODAY/TONIGHT/MONDAY. EARLY THIS MORNING A BAND OF STRONG STORMS DEVELOPED IN AN AREA OF CONVERGENCE SOUTH OF OSH ON THE NOSE OF OUTFLOW BOUNDARY FROM WESTERN WISCONSIN WEAKENED CONVECTION EARLIER TONIGHT. THIS BAND OF STORMS BRUSHED THE EXTREME FAR SOUTHERN PORTIONS OF CALUMET AND MANITOWOC BEFORE DRIFTING SOUTHEAST. OTHERWISE A BAND OF SHOWERS WERE MOVING OVER NORTHEAST WISCONSIN EARLY THIS MORNING. FOCUS TURNS TO WESTERN WISCONSIN WITH THE NEXT ROUND OF STORMS TO TRACK OVER PART OF THE AREA. CONVECTION FOCUSED ALONG AND NORTH OF A SURFACE WAVE AND AHEAD OF A MID LEVEL TROF WHICH WILL TRACK OVER MAINLY NORTH CENTRAL AND PART OF CENTRAL WISCONSIN MAINLY DURING THE MORNING HOURS BEFORE EXITING NORTHEAST WISCONSIN AND THE LAKESHORE EARLY THIS AFTERNOON. EXPECT THIS PCPN TO HOLD TOGETHER AND WILL PASS OVER AREAS MAINLY NORTH OF AUW TO GRB LINE. RADAR SHOWS NO CONVECTION SOUTH OVER CENTRAL WISCONSIN AT 08Z...BUT A CDFNT FROM THIS SURFACE WAVE AND THE MID LEVEL TROF WILL SWING OVER TODAY...AGAIN MAINLY IN THE MORNING OVER CENTRAL WI. AT 08Z CDFNT WAS OVER CENTRAL MN INTO IA. WILL INCLUDE SCT MENTION WITH ANTICIPATION OF FURTHER DEVELOPMENT ALONG THE FROPA. AREAS SOUTHEAST OF A LINE FROM CRIVITZ TO SHAWANO TO WAUTOMA IN A SPC SLIGHT RISK TODAY UNTIL THE FROPA AND MID LEVEL TROF PASSES EAST...AT THIS TIME EXITING EASTERN WISCONSIN BETWEEN 18 AND 20Z. SOME DECENT INSTABILITY TO WORK WITH TODAY AS THE FRONT WORKS OVER ESPECIALLY IF SOME BREAKS IN THE CLOUD COVER OCCUR. WEAK HIGH PRESSURE THEN SETTLES INTO THE STATE TONIGHT INTO MONDAY FOR A PERIOD OF QUIETER WEATHER. .LONG TERM...MONDAY NIGHT THROUGH NEXT SATURDAY. THE UPPER FLOW PATTERN SHOULD BE VERY TYPICAL OF MID SUMMER WITH THE WEST TO EAST JET STREAM ALONG THE UNITED STATES CANADA BORDER WITH WEAK RIDGING TO THE SOUTH. TIMING OF THE JET STREAKS MOVING THROUGH THE FLOW IS USUALLY CHALLENGING IN THIS FLOW PATTERN. IN ADDITION...THERE WILL LIKELY BE A FRONTAL BOUNDARY NOT TOO FAR FROM WISCONSIN FOR MOST OF THE WEEK. THE FRONTAL POSITION LOOKS TO BE FURTHER SOUTH THAN EARLIER RUNS...SO IT MAY NOT BE QUITE AS WARM AND HUMID AS IT LOOKED LIKE A FEW DAYS AGO. BECAUSE THE TIMING OF THE JET STREAKS AND POSITION OF THE FRONTAL BOUNDARY WILL BE DIFFICULT...STAYED AWAY FROM EXTREMES OF POPS AND TEMPERATURES. BEST CHANCE OF THUNDERSTORMS SHOULD BE THURSDAY AND FRIDAY BASED ON BEST LOW LEVEL WARM ADVECTION AND UPPER SUPPORT. && .AVIATION...MVFR CIGS TO PERSIST TODAY WITH SCT IFR VSBYS DUE TO SCT CONVECTION. EXPECT VFR CONDITIONS TO DEVELOP LATER TODAY FROM WEST TO EAST. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && TDH/RDM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 239 PM CDT SUN JUL 18 2010 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-191100- 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- 239 PM CDT SUN JUL 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TODAY AND TONIGHT AREAS OF FOG ARE EXPECTED TO DEVELOP OVERNIGHT. THE FOG COULD BECOME DENSE IN PLACES...AND REDUCE VISIBILITIES TO LESS THAN 1/4 MILE AT TIMES. RIVER VALLEYS AND LOW-LYING AREAS WILL BE ESPECIALLY SUSCEPTIBLE TO THE FORMATION OF DENSE FOG. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY AT LEAST A COUPLE ROUNDS OF THUNDERSTORMS WILL OCCUR DURING THE THE NEXT WEEK. THE WEATHER PATTERN MAKES IT DIFFICULT TO DETERMINE WHEN THEY WILL OCCUR...BUT CONDITIONS WILL BE FAVORABLE FOR HEAVY RAIN WITH THE STORMS. IN ADDITION...THE OVERALL PATTERN SUGGESTS THAT THERE COULD BE A RISK OF SEVERE STORMS AT SOME POINT. BE SURE TO MONITOR LATER FORECASTS FOR MORE DETAILS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT. LMZ521-522-541>543-191100- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 239 PM CDT SUN JUL 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE MICHIGAN AND THE WATERS OF GREEN BAY. .DAY ONE...TODAY AND TONIGHT AREAS OF FOG ARE EXPECTED TO DEVELOP OVERNIGHT. THE FOG COULD BECOME DENSE IN PLACES...AND REDUCE VISIBILITIES TO LESS THAN 1/4 MILE AT TIMES. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY AT LEAST A COUPLE ROUNDS OF THUNDERSTORMS WILL OCCUR DURING THE THE NEXT WEEK. THE WEATHER PATTERN MAKES IT DIFFICULT TO DETERMINE WHEN THEY WILL OCCUR...BUT CONDITIONS WILL BE FAVORABLE FOR HEAVY RAIN WITH THE STORMS. IN ADDITION...THE OVERALL PATTERN SUGGESTS THAT THERE COULD BE A RISK OF SEVERE STORMS AT SOME POINT. BE SURE TO MONITOR LATER FORECASTS FOR MORE DETAILS. JS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 901 AM CDT SUN JUL 18 2010 WIZ038>040-048>050-181515- OUTAGAMIE-BROWN-KEWAUNEE-WINNEBAGO-CALUMET-MANITOWOC- INCLUDING THE CITIES OF...APPLETON...GREEN BAY...ALGOMA... OSHKOSH...CHILTON...TWO RIVERS 901 AM CDT SUN JUL 18 2010 ...THUNDERSTORMS WITH HEAVY RAIN IN EAST-CENTRAL WISCONSIN... A CLUSTER OF THUNDERSTORMS...SOME WITH HEAVY RAIN AND HAIL... WILL SHIFT ACROSS EAST-CENTRAL WISCONSIN DURING THE MORNING. AT 855 AM...RADAR SHOWED THE CLUSTER EXTENDING FROM APPLETON TO OSHKOSH...AND MOVING EAST AT 35 MPH. THE CLUSTER OF STORMS WILL MOVE ACROSS LAKE WINNEBAGO...BROWN...AND CALUMET COUNTIES BY 930 AM...AND INTO KEWAUNEE AND MANITOWOC COUNTIES BY 1000 AM. THE STORMS WILL PRODUCE A WIDESPREAD 1/2 TO 3/4 INCH RAINFALL. THE STRONGEST STORMS IN THE CLUSTER WILL ALSO PRODUCE HAIL UP TO 1 INCH IN DIAMETER. HAIL TO NEARLY 1 INCH IN DIAMETER WAS REPORTED JUST WEST OF OSHKOSH AT 841 AM. ANYONE TRAVELING ACROSS THE AREA THIS MORNING SHOULD REMAIN ALERT FOR THE POSSIBILITY OF ENCOUNTERING VERY HEAVY RAIN WHICH WILL SERIOUSLY RESTRICT VISIBILITIES ON THE ROADWAY. IF INDOORS...STAY AWAY FROM WINDOWS AND DO NOT USE ELECTRICAL APPLIANCES UNTIL THE STORMS HAVE PASSED. SKOWRONSKI
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 946 AM CDT SUN JUL 18 2010 WIZ039-040-049-050-181600- BROWN-KEWAUNEE-CALUMET-MANITOWOC- INCLUDING THE CITIES OF...GREEN BAY...ALGOMA...CHILTON... TWO RIVERS 946 AM CDT SUN JUL 18 2010 ...THUNDERSTORMS WITH HEAVY RAIN IN EAST-CENTRAL WISCONSIN... A CLUSTER OF THUNDERSTORMS...SOME WITH HEAVY RAIN AND HAIL... CONTINUED TO MOVE ACROSS EAST-CENTRAL WISCONSIN. AT 940 AM...THE STORMS EXTENDED FROM NEAR KEWAUNEE....SOUTHWEST...TO SOUTHERN LAKE WINNEBAGO. THE STORMS WERE MOVING EAST AT 35 MPH. THE CLUSTER OF STORMS WILL SHIFT EAST ACROSS THE LAKESHORE AND OUT OVER LAKE MICHIGAN BY 1030 AM. THE STORMS WILL PRODUCE A WIDESPREAD 1/2 TO 3/4 INCH RAINFALL. THE STRONGEST STORMS IN THE CLUSTER WILL ALSO PRODUCE HAIL UP TO 1 INCH IN DIAMETER...AND ISOLATED WIND GUSTS TO 35 MPH. ANYONE TRAVELING ACROSS THE AREA THIS MORNING SHOULD REMAIN ALERT FOR THE POSSIBILITY OF ENCOUNTERING VERY HEAVY RAIN WHICH WILL SERIOUSLY RESTRICT VISIBILITIES ON THE ROADWAY. IF INDOORS...STAY AWAY FROM WINDOWS AND DO NOT USE ELECTRICAL APPLIANCES UNTIL THE STORMS HAVE PASSED. SKOWRONSKI
The Green Bay radar (KGRB), 64 km away, was scanning. The volume nearest the first event began at 19:53 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud formed under a relatively weak thunderstorm during the afternoon just north of Cedar Lake in southern Manitowoc County. The funnel appeared close to the ground, but no damage occurred.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2010Every state in 2010This day in weather historyWarnings in Wisconsin, July 2010
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: 235634.