A strong cold front moved east across Wisconsin and interacted with a moist and unstable airmass. A line of thunderstorms, that produced damaging winds, developed ahead of the front.
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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 strong cold front moved east across Wisconsin and interacted with a moist and unstable airmass. A line of thunderstorms, that produced damaging winds, developed ahead of the front.
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 21, 11:53 AM CST, 4 hours 27 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 1253 PM CDT FRI SEP 21 2007 .SHORT TERM...TNGT AND SAT. FOCUS ON STG SYSTEM CROSSING THROUGH TNGT. THERE WL BE A RISK OF SVR STORMS ALONG THE COLD FRONT THIS AFTN AND EVENING. ALSO SOMEWHAT CONCERNED ABOUT THE POSSIBILITY OF GETTING STG GRADIENT WINDS RIGHT BEHIND THE COLD FRONT TNGT AS DEEPENING LOW RACES OFF TO THE NE AND AWAY FM THE AREA. INCREASED WINDS RATHER SIG FOR THIS EVENING. WINDS SHOULD START TO DIMINISH LATER TNGT AS THE LOW PULLS AWAY FM THE AREA. EXPECT PLENTY OF SUNSHINE SAT...WITH CONTD ABV NORMAL TEMPS. .LONG TERM...SATURDAY NIGHT THROUGH NEXT FRIDAY. FORECAST FOCUS ON TIMING OF FRONT AND ASSOCIATED PRECIP MONDAY AND TUESDAY. HIGH PRESSURE AND SOUTHERLY WINDS WILL RAISE TEMPERATURES WELL ABOVE NORMAL SUNDAY AND SUNDAY NITE AHEAD OF AN APPROACHING LOW PRESSURE SYSTEM. THE MODELS ARE FAIRLY CONSISTENT EARLY ON WITH THE HANDLING OF THE SYSTEM WITH THE BEST CHANCES OUT IN THE WESTERN CWA DURING THE AFTERNOON HOURS. THE FRONT ITSELF MOVES INTO THE CWA MONDAY NITE...AS ALL MODELS PRODUCE A GOOD AMOUNT OF PRECIP. THEREFORE WILL RAISE POPS INTO THE LIKELY CATEGORY GIVEN THE MODEL CONSENSUS. LATER ON THE MODELS DIVERGE AS THE ECMWF HANGS THE FRONT UP OVER THE CENTRAL GREAT LAKES WITH ANOTHER DISTURBANCE MOVING ALONG THE FRONT WITH PRECIP WELL INTO TUESDAY NITE. THE CANADIAN/GFS MODELS CLEAR THE FRONT OUT MUCH QUICKER WITH NO PRECIP BY LATE MONDAY NITE. THE DGEX IS ABOUT 6 HOURS SLOWER THAN THE CANADIAN/GFS SOLUTIONS AS THE ENSEMBLES INDICATE PRECIP WILL PROABABLY LINGER INTO TUESDAY MORNING AND POSSIBLY TUESDAY AFTERNOON. GIVEN THE EXTREME RANGE OF SOLUTIONS WILL OPT WITH THE MIDDLE OF THE ROAD APPROACH AND LEAN TOWARDS THE ENSEMBLE MEMBERS THIS RUN...KEEPING A CHANCE IN FOR TUESDAY MORNING...A LESSER CHANCE DURING THE AFTERNOON...AND A DRY TUESDAY NITE. HIGH PRESSURE WILL THEN KEEP THE AREA DRY FOR THE REST OF THE WEEK WITH TEMPERATURES CLOSER TO NORMAL. THE GFS/CANADIAN MODELS BRING A WEAK TROF THRU THE WESTERN GREAT LAKES WEDNESDAY/WEDNESDAY NITE...HOWEVER THE DYNAMICS WITH THIS SYSTEM ARE WEAK ACROSS THE AREA. THE NEXT CHANCE FOR PRECIP DOES NOT LOOK TO BE UNTIL SOMETIME NEXT WEEKEND. && .AVIATION...PICKED 2 HR WINDOW OF TIME MOST LIKELY FOR TSRA AND INCLUDED IN THE TAFS. INCLUDED STG WINDS AT AUW/CWA/RHI...BUT HELD OFF ON GRB AS THE AIR ACRS THE W WL BE A BIT MORE STABLE. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SKOWRONSKI/KURIMSKI
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 1205 PM CDT FRI SEP 21 2007 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-221100- 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- 1205 PM CDT FRI SEP 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH-CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...THIS AFTERNOON AND TONIGHT A LINE OF THUNDERSTORMS IS EXPECTED TO PUSH ACROSS THE AREA THIS AFTERNOON AND THIS EVENING. SOME OF THE STORMS ARE LIKELY TO BE SEVERE. THE PRIMARY RISK IS OF DAMAGING WINDS...BUT LARGE HAIL IS ALSO POSSIBLE. THE LINE SHOULD AFFECT NORTH-CENTRAL WISCONSIN DURING THE MIDDLE TO LATE AFTERNOON HOURS. IT IS LIKELY TO SLOWLY WEAKEN AS IT PUSHES EAST...AND SHOULD EXIT EASTERN WISCONSIN SHORTLY BEFORE MIDNIGHT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORMS ARE AGAIN POSSIBLE MONDAY AND TUESDAY. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND THIS EVENING. LMZ521-522-541>543-564-221100- 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- 1205 PM CDT FRI SEP 21 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 WINDS AND WAVES HAZARDOUS TO SMALL CRAFT ARE EXPECTED THROUGH TONIGHT. IN ADDITION...A LINE OF THUNDERSTORMS IS EXPECTED TO PUSH ACROSS THE BAY OF GREEN BAY AND WESTERN LAKE MICHIGAN THIS EVENING. SOME OF THE STORMS COULD BE SEVERE AND PRODUCE STRONG WINDS AND LARGE HAIL. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORMS ARE AGAIN POSSIBLE MONDAY AND TUESDAY. THESE STORMS ARE NOT EXPECTED TO BE SEVERE.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 417 PM CDT FRI SEP 21 2007 WIZ018-030-035-212145- LINCOLN-MARATHON-WOOD- 417 PM CDT FRI SEP 21 2007 ...STRONG TO SEVERE THUNDERSTORMS MOVING INTO THE AREA... AT 415 PM...DOPPLER RADAR INDICATED A LINE OF STRONG TO SEVERE THUNDERSTORMS EXTENDING FROM NEAR MEDFORD TO BLACK RIVER FALLS. THE LINE OF SHOWERS AND THUNDERSTORMS WAS MOVING TO THE NORTHEAST AT 40 MPH. THE LINE OF THUNDERSTORMS IS CAPABLE OF PRODUCING WIND GUSTS IN EXCESS OF 50 MPH. THE THUNDERSTORM WILL BE NEAR... ABBOTTSFORD AROUND 425 PM ATHENS AND SPENCER AROUND 425 PM... STRATFORD AND MARSHFIELD AROUND 430 PM... MERRILL AROUND 435 PM... RESIDENTS OF LINCOLN...MARATHON AND WOOD COUNTIES SHOULD BE ON THE ALERT FOR STRONG WINDS AS THE LINE OF STORMS MOVE THROUGH YOUR COUNTY. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THE STORMS HAS PASSED. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM FRIDAY EVENING FOR NORTHEASTERN WISCONSIN. ECKBERG
The Marquette radar (KMQT), 158 km away, was scanning. The volume nearest the first event began at 22:19 UTC.
3 thunderstorm wind. Local standard time, as filed.
Strong winds associated with a line of thunderstorms downed trees and power lines in the Star Lake area.
Strong winds from a line of thunderstorms knocked down signs, trees and power lines, and produced 1/2 inch diameter hail.
High winds from thunderstorms tore 3 to 4 inch diameter branches from trees between Coloma and Wautoma.
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, September 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: 57477, 57480, 57481.