A bow echo produced severe weather across central Wisconsin as it quickly moved from eastern Minnesota to southern 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.
A bow echo produced severe weather across central Wisconsin as it quickly moved from eastern Minnesota to southern 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 Aug 11, 6:28 PM CST, 4 hours 8 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 728 PM CDT SAT AUG 11 2007 .UPDATE...REMOVED EVENING SVR WORDING SINCE ONLY CONVECTION PRODUCING SVR WEATHER NEAR MSP AND WILL NOT REACH C WI UNTIL LATE EVENING...IF THAT. WILL REINTRO SVR WORDING LATER TONIGHT IF RADAR TRENDS SUPPORT IT. MUCH OF THE EVENING CONVECTION NORTH OF THE MSP CONVECTION ISOLATED AND STRUGGLING TO MAINTAIN. TONED DOWN TSRA COVERAGE AS WELL DUE TO ISOLD NATURE ALONG THE FRONT. AREAS TO THE SOUTH FROM WAUTOMA TO OSHKOSH PICKED UP SOME NICE RAINS TODAY...THE REST OF THE FCST AREA WILL BE HIT AND MISS TNT AS PER LATEST RADAR TRENDS. TDH && .PREV DISCUSSION...ISSUED AT 354 PM CDT SAT AUG 11 2007... SHORT TERM...TONIGHT AND SUNDAY. THUNDERSTORMS ARE THE PRIMARY CONCERN IN THE SHORT TERM...ESPECIALLY THE POTENTIAL FOR SEVERE STORMS. RADAR COMPOSITE TIME LAPSE SHOWED THUNDERSTORMS MOVING ACROSS WESTERN AND CENTRAL WISCONSIN DURING THE AFTERNOON HOURS...BUT THINGS WERE RATHER QUIET WITH THIS AREA OF STORMS. IF THE STORMS HOLD TOGETHER...THEY SHOULD MOVE ACROSS THE PART OF THE CWA SOUTH OF A LINE FROM MARSHFIELD TO ALGOMA. 19Z MESOANALYSIS SHOWED HIGHEST MU/SB/ML CAPES IN MN/IA WITH LOWER VALUES IN CENTRAL AND EASTERN WI. CIN VALUES WERE AT LEAST 50 J/KG ACROSS THE REGION EXCEPT FROM EASTERN UPPER MI...ACROSS NORTHERN WI INTO NORTHERN MN AND IN EASTERN IOWA. STORMS THAT WERE MAKING THEIR WAY THROUGH WI DURING THE AFTERNOON WERE IN A RELATIVE MIN AREA OF CIN. SATELLITE WV LOOP SHOWED A SHORT WAVE PASSING THROUGH SOUTHERN ONTARIO SOUTH INTO WI...WITH THE MAIN VORT ENERGY NORTH OF WI...OVER LAKE SUPERIOR. A COLD FRONT WAS PUSHING ACROSS NORTHWEST MN EARLY THIS AFTERNOON. THIS FRONT IS EXPECTED TO BE THE MAIN TRIGGER MECHANISM FOR THUNDERSTORMS THIS EVENING/OVERNIGHT. WENT WITH LIKELY POPS FOR THE NORTHWEST 2/3 OF THE AREA 00Z-06Z WITH CHANCE POPS IN THE SOUTHEAST 1/3...THEN HIGH CHANCE POPS FOR MOST OF THE AREA 06Z-12Z SINCE DAYTIME HEATING WILL BE LOST DECREASING THE CHANCE OF THUNDERSTORMS. THE STORMS SHOULD BE OUT OF THE AREA BY 12Z SO DID NOT MENTION ANYTHING FOR SUNDAY. TEMPERATURES APPEARED REASONABLE SO MINOR...OR NO...CHANGES WERE MADE TO THEM. LONG TERM...SUNDAY NIGHT THROUGH NEXT SATURDAY...MAIN FCST CONCERNS ARE PCPN CHCS AND TEMPS. HIGH PRESSURE WILL BUILD INTO THE WSTRN GREAT LKS RGN SUNDAY NIGHT... THEN SHIFT EAST OF WISCONSIN BY MONDAY EVG. RETURN FLOW WILL BRING INCREASED MOISTURE AND INSTABILITY BACK TO THE FA MONDAY NGT...IN ADVANCE OF A COLD FRONT. THIS FRONT WILL MOVE THROUGH GRB CWA LATE MONDAY NGT AND TUESDAY MORNING...BRINGING THE NEXT SIGNIFICANT CHC OF PCPN. MODELS ARE SUGGESTING THAT AN MCS WILL MOVE THROUGH THE FA LATE MONDAY NGT...BUT THE SVR THREAT IS UNCERTAIN...ESP GIVEN THE TIMING OF THE EVENT. HAVE INCREASED POPS AND QPF A BIT...ESP OVER C/EC WI. WILL MAINTAIN CHC POPS FOR THE ENTIRE CWA TUESDAY MORNING...THEN GO WITH A DRY FCST FOR THE AFTERNOON. WILL NEED TO WATCH THE TIMING OF THE FRONT...AS A SLOWER MOVMT COULD RESULT IN PCPN LINGERING INTO THE AFTERNOON. THE PATTERN REMAINS FAIRLY STABLE THROUGH THE REMAINDER OF THE EXTENDED PERIOD...WITH A LARGE UPPER RIDGE OVER THE CNTRL U.S. AND THE MAIN STORM TRACK WELL TO OUR NORTH. EXPECT HIGH PRESSURE TO DOMINATE OUR WX FOR MOST OF THE PERIOD...BUT A WEST-EAST ORIENTED FRONT WILL BE SITUATED JUST TO OUR SOUTH (ALONG THE SOUTHERN EDGE OF THE WESTERLIES)...OVER THE UPPER MIDWEST AND OHIO VALLEY. ELEVATED CONVECTION NORTH OF THIS BOUNDARY COULD GET CLOSE TO OUR SOUTHERN BORDER AT TIMES...SO THE EXPECTED POSITION OF THIS BOUNDARY WILL NEED TO BE MONITORED FOR SUBSEQUENT FCSTS. TEMPS WILL REMAIN FAIRLY CLOSE TO NORMAL THROUGH MOST OF THE PERIOD. AVIATION...GENERALLY VFR CONDITIONS WITH GUSTY SOUTH WINDS THIS EVENING. HAVE MENTIONED THUNDERSTORMS WITH MVFR CEILINGS AND MVFR/IFR VISIBILITIES DURING STORMS AND MENTIONED SOME STRONGER GUSTS WITH THE STORMS IN CENTRAL WISCONSIN. EXPECT CLOUDS TO SCATTER OUT SUNDAY MORNING. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 1208 PM CDT SAT AUG 11 2007 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-121115- 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- 1208 PM CDT SAT AUG 11 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 THUNDERSTORMS WITH DAMAGING WINDS AND LARGE HAIL OVER MOST OF THE FORECAST AREA THIS AFTERNOON AND EVENING. AT THIS TIME IT APPEARS THE BEST CHANCE OF SEVERE STORMS WILL BE WEST OF A LINE FROM MARINETTE TO OSHKOSH DURING THE LATE AFTERNOON AND EVENING HOURS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A SERIES OF GENERALLY WEAK DISTURBANCES WILL AFFECT THE UPPER MISSISSIPPI VALLEY DURING THE WORK WEEK...HOWEVER THE EXACT TIMING AND LOCATION OF THESE SYSTEMS IS STILL UNCLEAR. AT THIS TIME IT APPEARS THE NEXT CHANCE FOR SHOWERS AND THUNDERSTORMS WILL BE SOMETIME LATE MONDAY INTO TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING. LMZ521-522-541>543-564-121115- 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- 1208 PM CDT SAT AUG 11 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 SCATTERED THUNDERSTORMS ARE POSSIBLE LATE THIS AFTERNOON THROUGH TONIGHT. SOME OF THE STORMS COULD BE STRONG...WITH GUSTY WINDS AND HAIL. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A SERIES OF GENERALLY WEAK DISTURBANCES WILL AFFECT THE UPPER MISSISSIPPI VALLEY DURING THE WORK WEEK...HOWEVER THE EXACT TIMING AND LOCATION OF THESE SYSTEMS IS STILL UNCLEAR. AT THIS TIME IT APPEARS THE NEXT CHANCE FOR SHOWERS AND THUNDERSTORMS WILL BE SOMETIME LATE MONDAY INTO TUESDAY. TSK/MG
The La Crosse radar (KARX), 98 km away, was scanning. The volume nearest the first event began at 04:35 UTC.
2 thunderstorm wind. Local standard time, as filed.
Straight-line winds from a thunderstorm knocked down several trees on Highway 80 near the Juneau County line.
Straight-line thunderstorm winds downed several trees and caused some roof damage to a home near Hancock.
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, August 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: 53426, 53429.