Thunderstorms developed northwest of an upper low over Michigan, as cold air aloft created an unstable atmosphere. A cold front later moved into Wisconsin from the west and produced additional storms.
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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.
Thunderstorms developed northwest of an upper low over Michigan, as cold air aloft created an unstable atmosphere. A cold front later moved into Wisconsin from the west and produced additional storms. The storms produced large hail, wind damage, at least one funnel cloud and heavy rain that caused some flash flooding.
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 26, 2:08 AM CST, 11 hours 37 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 308 AM CDT THU JUL 26 2007 .SHORT TERM...TODAY/TONIGHT/FRIDAY. MAIN EVENT DURING THIS PERIOD WILL BE ASSOCIATED HEAVY PCPN/SVR POTENTIAL WITH CDFNT PASSAGE TONIGHT. BUT FIRST...AN ISOLD BAND OF SHRA/TSRAS CONTINUES THIS AM ALONG A SURFACE CONVERGENT REGION EXTENDING FROM FLORENCE TO OSH EARLY THIS AM. THE INDIVIDUAL CELLS ARE MOVING MAINLY DUE SOUTH HOWEVER THE LINE IS DRIFTING GRADUALLY EASTWARD. THE GFS MODEL APPEARS TO BE LATCHING ON THIS TREND THE BEST SO WILL LEAN TWD THAT MODEL THROUGH 18Z TODAY. PCPN ALSO BEING AIDED WITH GENERAL HEIGHT FALLS DUE TO UPPER LOW TO THE EAST AND NRN PLAINS SHORT WAVE WITH FRONTAL SYSTEM...ALONG WITH A MOIST UNSTABLE AIRMASS AND VERTICAL WIND SHEAR. SLOW MOVEMENT OF THE INDIVIDUAL CELL AIDING WITH LOCALLY HEAVY RAINFALL...BUT MOVING ENOUGH AT THIS TIME TO PRODUCE ANY LOCAL FLOODING PROBLEMS. GROUND TRUTH REPORT FROM AROUND THE CLI AREA REPORTED HEAVY RAIN SO WILL ADD HEAVY RAIN WORDING EVEN THOUGH THE MENTION WILL BE ISOLD TO SCT IN THE GOING FCST. WILL CONTINUE SCT MENTION INTO THE AFTN HOURS OVER ERN DUE TO LOCATION OF LAKE BREEZE BOUNDARY AND UPPER HEIGHT FALLS AND CHC TO LOCATIONS WEST. EXPECT THE PCPN ALONG AND NEAR THE CDFNT TONIGHT TO BE EXCESSIVE DUE TO THE HIGH PW/S AND UPPER HEIGHT FALLS FROM THE PHASED SYSTEMS. WILL UP POP MENTION A TAD ABOVE LIKELY. SPC HAS PUT MUCH OF THE GRB CWA IN DAY 1 SLIGHT RISK. WITH HIGH WET BULB...MAIN SVR POTENTIAL WILL BE DAMAGING WINDS AND HEAVY RAIN. NEAR SEVERE HAIL POSSIBLE WITH STRONGER STORMS LATER TONIGHT. WILL GO INTO MORE DETAIL IN THE MORNING HWO. LATEST MODEL RUNS SUPPORT THE CURRENT CHC WORDING FOR FRIDAY MORNING AND OVER MAINLY THE SOUTHEAST HALF OF THE CWA. DUE NOTE THAT MODEL SURFACE DEWPOINTS DO NOT FALL THAT MUCH FOR FRIDAY SO SOME POTENTIAL OF PCPN TO LINGER LONGER. AS FRONT DRIVES SOUTH...PCPN WILL EVENTUALLY END LATER FRIDAY AS HIGH PRESSURE SYSTEM BUILDS IN. .LONG TERM...FRI NGT THRU NXT WED. MAIN FCST CHALLENGE WL BE TEMPS THRU THE PERIOD AS RATHER TRANQUIL WEATHER PATN SETS UP OVR NE WI. HI PRES OVR THE UPR MIDWEST WL BUILD SEWD INTO THE WRN GREAT LKS RGN FRI NGT BRINGING MOSTLY CLR SKIES AND RELATIVELY LGT WNDS TO NE WI. MAY NEED TO LWR MIN TEMPS A COUPLE OF DEGS AS DRIER AIRMASS SENDS DEW PTS DOWN INTO THE 50S (EVEN A FEW UPR 40S PSBL OVR NRN WI). THIS AREA OF HI PRES TO BE ESSENTIALLY OVRHD ON SAT WHICH SHOULD PROVIDE FOR A MOSTLY SUNNY DAY WITH SEASONAL TEMPS. AREAS NEAR LK MI TO BE COOLER AS NE WNDS TO PREVAIL. LITTLE IF ANY CHG EXPECTED INTO SAT NGT WITH THE HI PRES PARKED OVR WI. ANTICIPATE ANOTHER MOSTLY CLR NGT WITH TEMPS SIMILAR TO THOSE WITNESSED FRI NGT. SLIGHTLY WARMER CONDITIONS ARE EXPECTED FOR SUNDAY AS THE ROCKIES UPR RDG EDGES EWD A BIT TOWARD THE PLAINS. HI PRES AT THE SFC STILL IN OUR VCNTY...THUS ANOTHER MOSTLY SUNNY DAY ANTICIPATED. MDLS HINT AT A WEAK SYSTEM TO SLIDE DOWN THE EDGE OF THE UPR RDG ACROSS ONTARIO SUNDAY NGT INTO MON. ANY PCPN SHOULD REMAIN TO OUR NORTH AND EAST...HOWEVER NE WI COULD GET SOME OF THE CLDS FROM THIS SYSTEM ESP FAR NE SECTIONS OF THE STATE. PARTLY CLDY SKIES AT WORST WHICH WL NOT IMPACT TEMPS (IF AT ALL). THE UPR RDG CONTS TO EDGE CLOSER BY MON AND REACHES THE UPR MIDWEST WITH 8H TEMPS REACHING THE UPR TEENS CELSIUS. THE GFS MAY BE TOO AGGRESSIVE WITH THE WARM-UP AND HAVE KEPT TEMPS IN LINE WITH PREV FCST. THE ERN PERIPHERY OF THE UPR RDG TO REACH WRN WI BY TUE BRINGING VERY WARM TEMPS BACK TO THE RGN. WL HAVE TO WATCH FOR ANY POTENTIAL SHRTWVS ROTATING AROUND THE RDG WHICH COULD MOV INTO WI AND SET OFF SOME PCPN. NOTHING EVIDENT AT THIS TIME FOR TUE...THEREFORE WL CONT WITH THE DRY FCST. BY THE MIDDLE OF NXT WEEK...MDLS HINT AT A DECENT SHRTWV TROF TO BE TRAVERSING ACROSS THE CANADIAN PRARIE. WHILE THE CORE OF THIS SYSTEM TO REMAIN WELL TO OUR NORTH (VCNTY WRN ONTARIO BY 00Z THU)...IT WL SERVE TO WEAKEN THE UPR RDG A BIT OVR THE UPR MIDWEST/WRN GREAT LKS. HAVE LEFT FCST DRY...BUT THE BRUNT OF THE TRULY HOT WEATHER APRS TO REMAIN TO OUR WEST. && .AVIATION...SCT TSTMS WILL CONTINUE OVER EASTERN WI NEAR AND ALONG PERSISTENT LAKE BREEZE BOUNDARY. TSRA/S WILL BE ON THE INCREASE THIS AFTERNOON OVER THE REST OF THE STATE AS A CDFNT APPROACHES NORTHWEST WISCONSIN. THE CDFNT IS EXPECTED TO REACH SE WISCONSIN FRIDAY MORNING. A FEW STORMS MAY CONTAIN DAMAGING WINDS AND VERY HEAVY RAINFALL. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && TDH/KALLAS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 1107 AM CDT THU JUL 26 2007 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-271145- 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- 1107 AM CDT THU JUL 26 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH-CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...THIS AFTERNOON AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE STORMS OVER MOST OF THE FORECAST AREA LATER THIS AFTERNOON AND INTO TONIGHT. ALTHOUGH ISOLATED STORMS MAY PRODUCE WIND DAMAGE OR MARGINALLY SEVERE HAIL...THE PRIMARY THREAT SHOULD BE HEAVY RAINFALL. THUNDERSTORMS WILL INCREASE IN COVERAGE THIS AFTERNOON...AND BECOME FAIRLY WIDESPREAD TONIGHT...AS A COLD FRONT MOVES THROUGH THE FORECAST AREA. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS WILL END FRIDAY MORNING AS THE COLD FRONT MOVES SOUTH OF THE STATE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT. LMZ521-522-541>543-564-271145- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- THE ADJOINING WISCONSIN WATERS OF LAKE MICHIGAN OUT TO MID-LAKE- 1107 AM CDT THU JUL 26 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WATERS OF CENTRAL AND SOUTHERN GREEN BAY...AND LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO SHEBOYGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON. THE STORMS WILL BECOME MORE NUMEROUS TONIGHT AS A COLD FRONT FRONT APPROACHES AND MOVES THROUGH THE REGION. ALTHOUGH SOME STORMS MAY PRODUCE SOME GUSTY WINDS AND SMALL HAIL...THE PRIMARY THREAT SHOULD BE HEAVY RAINFALL. AREAS OF MARINE FOG...LOCALLY DENSE...WILL AFFECT THE MARINE FORECAST AREA THIS AFTERNOON AND TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS WILL END FRIDAY MORNING AS THE COLD FRONT MOVES SOUTH OF THE STATE. KIECKBUSCH
The Green Bay radar (KGRB), 80 km away, was scanning. The volume nearest the first event began at 19:44 UTC.
7 hail, 6 heavy rain, 4 thunderstorm wind, 1 funnel cloud, 1 flash flood. Local standard time, as filed.
An amateur radio operator measured rainfall of 4.45 inches in a little more than 2 hours. The heavy rain resulted in some street flooding in Iola.
A National Weather Service cooperative observer measured 1.12 inches of rainfall in 45 minutes.
A thunderstorm wind gust downed hundreds of trees and knocked down power lines in St. Germain. At least six homes were damaged by the fallen trees.
A funnel cloud, that nearly touched down, was reported by the public and relayed via the sheriff's department. Listed time is approximate.
An amateur radio operator measured 0.50 inch of rain in just 4 minutes and total rainfall of 1.50 inches in 2 hours at Pickerel.
Thunderstorm winds downed a tree and many branches east of Colby.
Thunderstorm winds knocked down trees at scattered locations around the county. Heavy rainfall with the storms resulted in some street flooding in Wautoma.
A Wausau television station measured 0.75 inch of rain in just 15 minutes.
An automated rain gauge from a local television station Weathernet reported 3.09 inches of rain at Wautoma.
The AWOS at Central Wisconsin Airport, in Mosinee, recorded 1.10 inches of rain in 20 minutes.
Straight-line winds from a thunderstorm, likely a wet microburst, downed trees and branches and flooded area roads. The high winds blew two airplanes into each other at New Holstein Municipal Airport when a tie-down broke loose, threw a tree branch through the top of another plane's wing and flipped a pop-up camper severely damaging it.
As much as 4.50 inches of rain fell in about two hours around Wautoma between 7:30 and 9:30 PM. The heavy rain caused waters to rapidly rise on roads in Wautoma, temporarily closing them. Two basements also experienced flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2007Every state in 2007This day in weather historyWarnings in Wisconsin, July 2007
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: 48637, 48627, 48629, 48630, 48635, 48631, 48644, 48626, 48632, 48633, 48634, 48638, 48655, 48647, 48641, 48640, 48643, 48653, 48625.