Thunderstorms developed in unstable air ahead of an approaching cold front and upper level disturbance. A couple storms produced isolated large hail and wind damage in central Wisconsin.
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.
Thunderstorms developed in unstable air ahead of an approaching cold front and upper level disturbance. A couple storms produced isolated large hail and wind damage in central Wisconsin.
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 Sep 1, 3:04 AM CST, 1 hour 16 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 404 AM CDT SUN SEP 1 2013 FORECAST DISCUSSION FOR ROUTINE MORNING FORECAST ISSUANCE .SHORT TERM...TODAY...TONIGHT...AND MONDAY ISSUED AT 403 AM CDT SUN SEP 1 2013 ISSUES THIS PERIOD ON PCPN TRENDS TODAY...THEN SKYCON FOR SUN NIGHT INTO MONDAY. LATEST MSAS ANALYSIS/RADAR SHOWING COLD FRONT MOVING INTO WESTERN WI ATTM. SCATTERED SHOWERS AND A FEW THUNDERSTORMS WERE DEVELOPING OUT AHEAD OF THE FRONT OVER NORTHERN WI AS SUGGESTED BY HRRR. NO REAL CHANGE MADE TO PREVIOUS FORECAST FOR TODAY...SPEEDING UP EASTWARD PROGRESSION OF PCPN SOME. SOME CONCERNS ON STORMS WITH INCREASING SHEAR OVER CWA...THOUGH CURRENT STORMS MOVING OUT OF INSTABILITY AXIS OVER WESTERN WI...WHICH IS WEAK. WILL USE AREAL TERMS FOR COVERAGE. FRONT TO MOVE THROUGH GRB AROUND 18Z. COOLER AND DRIER AIR TO MOVE INTO STATE BEHIND FRONT. MODEL SOUNDINGS INDICATE MOISTURE TRAPPED BELOW INVERSION SUN NIGHT INTO MONDAY MORNING...WHICH WILL LIKELY BE ENHANCED BY MOISTURE OFF LAKE SUPERIOR WITH COOL NORTH WINDS FLOWING OVER LAKE. HAVE BROUGHT CLOUD COVER UP...AND LINGERED IT INTO MON AFTN...WHEN SUBSIDENCE SHOULD ERODE. WENT SLIGHTLY COOLER ON TEMPS MON...BIT WARMER SUN NIGHT GIVEN CLOUDS. .LONG TERM...MONDAY NIGHT THROUGH SATURDAY ISSUED AT 403 AM CDT SUN SEP 1 2013 THE MAIN FEATURE IMPACTING WEATHER ACROSS THE FORECAST AREA FOR THE LONG TERM IS AN UPPER LEVEL RIDGE THAT IS EXPECTED TO AMPLIFY DURING THE WEEK. SURFACE HIGH PRESSURE IS FORECAST OVER THE REGION FOR THE EARLY PART OF THE WEEK. THERE ARE TIMING DIFFERENCES AMONG THE MODELS WITH A COLD FRONT PUSHING SOUTH ACROSS WISCONSIN MID TO LATE WEEK AS AN UPPER SYSTEM PASSES WELL TO THE NORTHEAST OF THE STATE. THE 12Z ECMWF WAS FASTER THAN THE 00Z GFS WITH THIS BOUNDARY AND KEPT THE AREA DRY. THE SLOWER GFS DID INDICATE SOME QPF AS THE BOUNDARY PASSES. HAVE CONTINUED THE DRY FORECAST THROUGH THURSDAY SINCE THERE WILL BE LITTLE MOISTURE TO WORK WITH AND THERE SHOULD BE LITTLE...IF ANY...UPPER LEVEL SUPPORT. ANOTHER FRONT IS EXPECTED TO MAKE ITS WAY THROUGH THE AREA DURING THE COMING WEEKEND. TIMING IS A BIT DIFFERENT BUT MODELS WERE SHOWING SOME QPF...JUST NOT ALWAYS IN THE SAME PLACE AND TIME. CONFIDENCE IN LOCATION AND TIMING OF ANY SHOWERS...IF THEY DO DEVELOP...IS RATHER LOW SO HAVE SOME SLIGHT CHANCE POPS SCATTERED AROUND THE FORECAST AREA FROM THURSDAY NIGHT INTO SATURDAY. LOW TEMPERATURES SHOULD BE RATHER COOL MONDAY NIGHT WITH HIGH PRESSURE MOVING IN AND NOT MUCH CLOUD COVER. BUT EXPECT NEAR NORMAL HIGHS FOR TUESDAY WITH PLENTY OF SUNSHINE. ABOVE NORMAL TEMPERATURES ARE LIKELY FOR TUESDAY NIGHT AND WEDNESDAY AHEAD OF THE APPROACHING COLD FRONT. HAVE THE FRONT PASSING THROUGH ON WEDNESDAY...CLOSER TO THE 12Z ECMWF TIMING SO WEDNESDAY NIGHT AND THURSDAY WILL BE COOLER...BUT NEAR NORMAL FOR THIS TIME OF YEAR. EXPECT MAINLY ABOVE NORMAL TEMPERATURES FOR THE FORECAST PERIOD. && .AVIATION...FOR 06Z TAF ISSUANCE ISSUED AT 1046 PM CDT SAT AUG 31 2013 A STRONG COLD FRONT AND UPPER LEVEL DISTURBANCE WILL AFFECT THE REGION LATE TONIGHT INTO SUNDAY. SOME PATCHY MVFR/IFR FOG WILL CONTINUE UNTIL THE THICKER CLOUD COVER AND PCPN ARRIVES. BEST BET FOR SHOWERS AND TSTMS WILL BE OVER NORTHERN WI LATE TONIGHT INTO EARLY SUNDAY...WITH ONLY SCT PCPN EXPECTED FARTHER SOUTH. GIVEN RECENT RADAR TRENDS...HAVE REMOVED TEMPO GROUPS FOR TSTMS AT AUW/CWA. KEPT A MENTION IN THE RHI TAF OVERNIGHT INTO EARLY SUNDAY. MVFR/IFR CONDITIONS MAY ACCOMPANY THE TSTMS...AND PATCHY MVFR/IFR CIGS MAY ALSO DEVELOP IN THE WAKE OF THE COLD FRONTAL PASSAGE ON SUNDAY. SCT TSTMS COULD ALSO DEVELOP ALONG THE FRONT AS IT MOVES THROUGH EAST CENTRAL WI DURING THE EARLY TO MID AFTERNOON. KEPT A PROB30 GROUP AT GRB/ATW TO COVER THIS POSSIBILITY. WITH COLD NNW FLOW MOVING ACROSS WESTRN LK SUPERIOR ON SUNDAY EVG...SOME SCT LAKE-EFFECT RAIN SHOWERS AND LOW CLOUDS COULD AFFECT NORTH CENTRAL WI...INCLUDING THE RHI TAF SITE. THE REST OF THE FORECAST AREA SHOULD SEE PARTIAL CLEARING. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM.....TE LONG TERM......MG AVIATION.......KIECKBUSCH
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE GREEN BAY WI 826 PM CDT SAT AUG 31 2013 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-020130- 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- 826 PM CDT SAT AUG 31 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TONIGHT. ISOLATED SEVERE THUNDERSTORMS WITH DAMAGING WINDS AND HAIL UP TO QUARTER SIZE ARE POSSIBLE OVER NORTH CENTRAL AND FAR NORTHEAST WISCONSIN AFTER 3 AM. LOCALLY HEAVY RAINFALL IS ALSO ANTICIPATED. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY THUNDERSTORM CHANCES WILL CONTINUE ON SUNDAY AS A COLD FRONT MOVES THROUGH THE REGION. ALTHOUGH WIDESPREAD SEVERE WEATHER IS NOT EXPECTED...ISOLATED STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE IN FAR NORTHEAST WISCONSIN EARLY IN THE MORNING...AND IN EAST CENTRAL WISCONSIN DURING THE EARLY TO MID PART OF THE AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER GROUP ACTIVATION SHOULD NOT BE NEEDED TONIGHT...BUT SPOTTERS ARE URGED TO RELAY ANY REPORTS OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE. LMZ521-522-541>543-020130- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 826 PM CDT SAT AUG 31 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE MICHIGAN AND THE WATERS OF GREEN BAY. .DAY ONE...TONIGHT THERE IS A CHANCE OF THUNDERSTORMS LATE TONIGHT...BUT SEVERE WEATHER IS NOT EXPECTED. PATCHY MARINE FOG MAY ALSO DEVELOP ON THE NEARSHORE WATERS OF LAKE MICHIGAN. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE ON SUNDAY AS A COLD FRONT MOVES THROUGH THE AREA. ISOLATED STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE DURING THE EARLY TO MID PART OF THE AFTERNOON. GUSTY NORTH WINDS ARE EXPECTED SUNDAY NIGHT INTO MONDAY NIGHT... IN THE WAKE OF A STRONG COLD FRONT. THE WINDS AND RESULTING WAVES ARE LIKELY TO REACH LEVELS HAZARDOUS TO SMALL CRAFT. KIECKBUSCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 339 AM CDT SUN SEP 1 2013 WIZ005-010-011-018-010930- FOREST-LINCOLN-ONEIDA-VILAS- 339 AM CDT SUN SEP 1 2013 ...SIGNIFICANT WEATHER ADVISORY... AT 333 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS DEVELOPING ALONG A LINE FROM TRIPOLI TO LAC DU FLAMBEAU...MOVING EAST AT 40 MPH. PEA SIZE HAIL...WINDS 40 TO 45 MPH...ARE POSSIBLE WITH THE STORMS. LOCATIONS IMPACTED INCLUDE... WOODBORO... MC NAUGHTON... LAKE TOMAHAWK... ST GERMAIN... RHINELANDER... SUGAR CAMP... STARKS... EAGLE RIVER... THREE LAKES... MONICO... CLEARWATER LAKE... GAGEN... FRANKLIN LAKE CAMPGROUND... ANVIL LAKE CAMPGROUND... HILES... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. TE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 441 AM CDT SUN SEP 1 2013 WIZ018-019-030-035-036-011045- LANGLADE-LINCOLN-MARATHON-PORTAGE-WOOD- 441 AM CDT SUN SEP 1 2013 ...SIGNIFICANT WEATHER ADVISORY... AT 437 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SCATTERED THUNDERSTORMS ALONG A LINE EXTENDING FROM 27 MILES NORTHWEST OF ANTIGO TO 29 MILES SOUTHWEST OF WAUSAU...MOVING EAST AT 30 MPH. PEA SIZE HAIL...WINDS 40 TO 45 MPH...ARE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... MOON... MILLADORE... BROKAW... BLOOMVILLE... DUDLEY... RIB MOUNTAIN STATE PARK... RIB MOUNTAIN... GLEASON... WAUSAU... PARRISH... MOSINEE... DOERING... BAVARIA... SCHOFIELD... ROTHSCHILD... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED. TE
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
517 AM CDT SUN SEP 01 2013
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0514 AM HAIL EDGAR 44.91N 89.96W
09/01/2013 M0.25 INCH MARATHON WI PUBLIC
&&
SACThe Green Bay radar (KGRB), 127 km away, was scanning. The volume nearest the first event began at 10:19 UTC.
3 hail, 1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds downed approximately 30 trees on property southeast of Wausau. The isolated damage was caused by thunderstorm winds that were estimated to be at least 70 mph.
Thunderstorms produced nickel size hail that fell in Knowlton.
Thunderstorms produced nickel size hail that fell in Polonia.
Thunderstorms produced quarter size hail that fell on Highway 161 between Iola and Symco.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2013Every state in 2013This day in weather historyWarnings in Wisconsin, September 2013
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: 477049, 477046, 477047, 477048.