Conditions across central Wisconsin remained dry throughout the month causing severe drought (D2) conditions to persist in Waushara County, southern Portage County and the southern half of Wood County. The below normal rainfall caused extreme drought (D3) conditions to develop in central Wisconsin, including the southwest corner of Wood County.
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Conditions across central Wisconsin remained dry throughout the month causing severe drought (D2) conditions to persist in Waushara County, southern Portage County and the southern half of Wood County. The below normal rainfall caused extreme drought (D3) conditions to develop in central Wisconsin, including the southwest corner of Wood County.
September precipitation for Marshfield (Wood Co.) was only 0.81 inch and for Wisconsin Rapids (Wood Co.) was 1.63 imches. Both totals were more than 2 inches below normal for the month.
Severe drought (D2) and a small area of extreme drought (D3) conditions continued into October 2012.
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 31, 9:41 PM CST, 2 hours 19 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 1041 PM CDT FRI AUG 31 2012 UPDATED AVIATION PORTION FOR 06Z TAF ISSUANCE .SHORT TERM...TNGT AND SAT. MAIN FCST FOCUS OVER THE NEXT 24 HOURS TO BE ON TEMPS AS HI PRES KEEPS NE WI PROTECTED FROM ANY PCPN TRYING TO WORK NORTH FROM FORMER HURRICANE ISAAC. THE 19Z MSAS SFC ANALYSIS INDICATED AN AREA OF HI PRES EXTENDED FROM THE UPR MS VALLEY EWD INTO THE WRN GREAT LKS. THE CENTER OF WHAT USED TO BE HURRICANE ISAAC WAS SITUATED OVER SW MO...BUT HI CLOUDS FROM THE SYSTEM WERE ALREADY PUSHING INTO SRN WI. OTHER MID AND HI CLOUDS OVER THE PLAINS ASSOCIATED WITH THE START OF WAA WL NOT REACH NE WI ANY TIME SOON. THE SPRAWLING AREA OF HI PRES TO EVENTUALLY EXTEND FROM JAMES BAY SWD INTO THE GREAT LAKES REGION BY 12Z SAT. UNDER MOSTLY CLEAR SKIES...LIGHT/VARIABLE WINDS AND A DRY AIR MASS OVERHEAD...EXPECT ALMOST PERFECT RADIATIONAL COOLING CONDITIONS TO EXIST AND THIS WL ALLOW FOR TEMPS TO QUICKLY FALL THRU THE NGT. BY DAYBREAK...THE TYPICAL COLD SPOTS OF NRN WI (LNL/TKV/RRL) COULD BE FLIRTING WITH 40 DEGREES. HAVE GENERALLY MADE ONLY MINOR TWEAKS TO THE PREVIOUS FCST WHICH STILL LOOKED GOOD OVERALL. THIS AREA OF HI PRES IS NOT FCST TO MOVE MUCH ON SAT AND THIS WL PREVENT THE REMNANTS OF ISAAC FROM MOVING ANY FARTHER NORTH THAN CNTRL IL. NE WI WL BE ABLE TO SEE THE HI CLOUDS FROM ISAAC SPREAD NWD DURING THE DAY...BUT ANY PCPN WL REMAIN SOUTH OF THE WI/IL BORDER. 8H TEMPS TO REMAIN AROUND +16C WHICH WL BRING ANOTHER ABOVE NORMAL DAY AS FAR AS MAX TEMPS GO. LOOK FOR READINGS TO RANGE FROM THE MID 70S NEAR THE LAKE (ONSHORE WINDS) TO THE LWR 80S OVER CNTRL WI. .LONG TERM...SATURDAY NIGHT THROUGH NEXT THURSDAY. MEDIUM RANGE MODELS REMAIN IN AGREEMENT THAT THE OLD TROPICAL SYSTEM WILL STAY TO OUR SOUTH SATURDAY NIGHT AND SUNDAY WITH WEAK UPPER RIDGING ACROSS THE WESTERN GREAT LAKES. A WEAK UPPER TROUGH AND SURFACE BOUNDARY IS FORECAST TO MOVE THROUGH ON LABOR DAY. SINCE THE UPPER SUPPORT IS WEAK AND LOW LEVEL MOISTURE UNCERTAIN WE JUST KEPT A CHANCE OF SHOWERS OR THUNDERSTORMS. THE FRONT EXITS MONDAY NIGHT WITH WEAK HIGH PRESSURE MOVING IN FOR TUESDAY. THE UPPER FLOW IS STRONGER AND MORE ZONAL BY THEN AND ANOTHER FRONTAL SYSTEM LOOKS LIKE IT WILL COME THROUGH LATE TUESDAY NIGHT OR WEDNESDAY. THIS UPPER SYSTEM LOOKS STRONGER THAN THE ONE MONDAY SO WE EXPECT A GOOD CHANCE OF THUNDERSTORMS WITH IT. THEN DRY AND COOLER THURSDAY AS UPPER FLOW BECOMES NORTHWEST AND SURFACE HIGH BUILDS IN FROM THE NORTHERN PLAINS. && .AVIATION...FOR 06Z TAF ISSUANCE. ABOUT THE ONLY POSSIBLE WX CONCERN FOR AVIATION INTERESTS WOULD BY ANY PATCHY MIFG THAT FORMS OVERNIGHT. AT THIS POINT...THE POSSIBILITY OF IT AFFECTING AIRPORT OPS ONLY SEEMS SIG ENOUGH FOR INCLUSION WITH A TEMPO GROUP IN THE RHI TAF. SKOWRONSKI && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 340 AM CDT FRI AUG 31 2012 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-010845- 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- 340 AM CDT FRI AUG 31 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS SUNDAY NIGHT INTO MONDAY...AND AGAIN WEDNESDAY INTO THURSDAY. IT IS TOO EARLY TO DETERMINE IF SEVERE WEATHER WILL DEVELOP DURING THESE PERIODS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. LMZ521-522-541>543-010845- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 340 AM CDT FRI AUG 31 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE MICHIGAN AND THE WATERS OF GREEN BAY. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS ON MONDAY...AND AGAIN FROM WEDNESDAY INTO THURSDAY. IT IS TOO EARLY TO DETERMINE IF SEVERE WEATHER WILL DEVELOP DURING THESE PERIODS. TSK/MPC
The national radar mosaic for the moment the first event began.
3 drought. Local standard time, as filed.
Rainfall totals that were 2 inches or more below normal caused severe drought conditions (D2) to persist across the south half of the county. It also led to the development of extreme drought (D3) conditions in the southwest corner of the county. These conditions continued into October 2012.
Below normal rainfall caused severe drought conditions (D2) to persist into October 2012 across the southern part of the county.
Below normal rainfall caused severe drought conditions (D2) to persist into October 2012.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2012Every state in 2012This day in weather historyWarnings in Wisconsin, September 2012
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: 408851, 408853, 408854.