Isolated thunderstorms developed along a warm front that moved through northeast Wisconsin during the evening of the August 7th, producing large hail and wind damage in Marinette County. A convective system moved into the area during the early morning hours of the 8th, bringing damaging and torrential rains to other parts of northeast 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.
Isolated thunderstorms developed along a warm front that moved through northeast Wisconsin during the evening of the August 7th, producing large hail and wind damage in Marinette County. A convective system moved into the area during the early morning hours of the 8th, bringing damaging and torrential rains to other parts of northeast 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 7, 2:52 PM CST, 4 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 352 PM CDT SAT AUG 7 2010 .SHORT TERM...TONIGHT AND SUNDAY SEVERAL ISSUES TO DEAL WITH FOR TONIGHT INTO...INCLUDING PRECIPITATION ASSOCIATED WITH WEAK 850MB WARM ADVECTION AND MOISTURE ADVECTION THIS EVENING...THEN MCS ACTIVITY OVERNIGHT INTO SUNDAY MORNING AND THEN REDEVELOPMENT OF STORMS SUNDAY AFTERNOON. MODELS CONTINUE TO SHOW WEAK 850MB WARM ADVECTION AND MOISTURE TRANSPORT INTO NORTHERN MINNESOTA AND NORTHERN WISCONSIN THIS EVENING. CONVECTION DID BREAK OUT ACROSS NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN THIS AFTERNOON. MODELS ARE HINTING AS CONVECTION ACROSS THE NORTHERN HALF OF THE FORECAST AREA THIS EVENING ASSOCIATED WITH THIS FEATURE. HAVE TRENDED RAIN CHANCES HIGHEST ACROSS THE NORTH WITH THIS FEATURE. OVERNIGHT...MCS ACTIVITY THAT IS EXPECTED TO DEVELOP ACROSS WESTERN MINNESOTA WILL MOVE INTO CENTRAL AND NORTH CENTRAL WISCONSIN OVERNIGHT. DAY ONE HAS PORTIONS OF CENTRAL AND NORTH CENTRAL IN A SLIGHT RISK FOR SEVERE THUNDERSTORMS LATE TONIGHT. COMPLEX ACROSS MINNESOTA SHOULD EVOLVE INTO A WIND EVENT ACROSS WISCONSIN OVERNIGHT. MODELS DO HAVE SEVERAL SOLUTIONS ON HOW THIS COMPLEX WILL EVOLVE LATE TONIGHT...BUT TRENDED TOWARD THE CANADIAN/ECMWF SOLUTION FOR SUNDAY MORNING. MANY QUESTION STILL LINGER IF ATMOSPHERE CAN RECOVER SUNDAY AFTERNOON FOR ADDITIONAL STORMS. TOOK A COMPROMISE BETWEEN THE COOLER MET GUIDANCE AND THE WARMER MAV GUIDANCE. .LONG TERM...SUNDAY NIGHT THROUGH SATURDAY. LOOKS LIKE WE GET BACK INTO THE PATTERN THAT WE'VE HAD MUCH OF THE SUMMER...A MAINLY ZONAL FLOW ALOFT AND A SURFACE BOUNDARY THAT MOVES NORTH AND SOUTH PERIODICALLY AS SHORT WAVES MOVE THROUGH THE UPPER FLOW. DEWPOINTS ARE EXPECTED TO BE IN THE 60S AND 70S BRINGING THE POTENTIAL OF HEAVY RAINS. WE ARE CLOSE TO RECORD SUMMER RAINFALL IN MUCH OF THE FORECAST AREA AND THE GROUND REMAINS WET IN MANY PLACES. SO THERE IS SOME POTENTIAL OF SMALL STREAM AND URBAN FLOODING AT TIMES NEXT WEEK. BEST CHANCE OF RAIN LOOKS TO BE TUESDAY NIGHT AS A WARM FRONT LIFTS NORTH ACROSS THE AREA AND WEDNESDAY AS A WEAK COLD FRONT GOES BY. MIGHT GET A FEW DRY DAYS THURSDAY AND FRIDAY AS MID LEVELS MAY BE WARM ENOUGH TO BE CAPPED. A DECENT COLD FRONT WILL MOVE THROUGH FRIDAY NIGHT OR SATURDAY AND BRING A LINE OF STORMS AND THEN DRIER AND COOLER WEATEHR FOR A COUPLE DAYS AFTER. && .AVIATION...TWO CLUSTER OF SHOWERS AND STORMS MOVING ACROSS THE REGION THIS AFTERNOON. FIRST CLUSTER NEAR OSHKOSH MOVING EAST TOWARDS THE LAKE. THIS CLUSTER WILL AFFECT KOSH AND KMTW BY 00Z. SECOND CLUSTER OF STORMS NOW WORKING INTO NORTHWEST WISCONSIN. THESE STORMS MAY AFFECT KTKV...KRHI...KRRL...KAUW...KAIG BY LATE AFTERNOON AND EARLY EVENING. WEAK 850MB WARM ADVECTION WILL CONTINUE THROUGHOUT THE EVENING...THEREFORE SCATTERED CONVECTION SHOULD CONTINUE THROUGH MOST OF THE EVENING NORTH OF KSUE...KAUW LINE. OVERNIGHT...A COMPLEX OF THUNDERSTORMS THAT IS EXPECTED TO DEVELOP ACROSS WESTERN MINNESOTA WILL MOVE INTO NORTH CENTRAL AND CENTRAL WISCONSIN. THIS CLUSTER OF STORMS MAY BE CAPABLE OF PRODUCING DAMAGING WINDS AND LOCALLY HEAVY RAIN. THE CLUSTER OF STORMS WILL MOVE ACROSS NORTHEAST WISCONSIN SUNDAY MORNING. MANY QUESTIONS LINGER IF STORMS WOULD REDEVELOP SUNDAY AFTERNOON. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && ECKBERG/RDM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 330 PM CDT SAT AUG 7 2010 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-082030- 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- 330 PM CDT SAT AUG 7 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF NORTH CENTRAL AND CENTRAL WISCONSIN TONIGHT. SCATTERED THUNDERSTORMS ARE EXPECTED THIS EVENING AS A WARM FRONT PUSHES NORTH ACROSS THE REGION. AN ISOLATED SEVERE STORM IS POSSIBLE. MEANWHILE...A COMPLEX OF THUNDERSTORMS WILL DEVELOP ACROSS WESTERN MINNESOTA AND EASTERN NORTH DAKOTA THIS EVENING...THEN MOVE INTO NORTH CENTRAL AND CENTRAL WISCONSIN OVERNIGHT. THIS CLUSTER OF STORMS WILL BE CAPABLE OF PRODUCING DAMAGING WINDS AND HEAVY RAINS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY THERE IS A SLIGHT RISK OF SEVERE WEATHER OVER NORTHEAST AND EAST CENTRAL WISCONSIN SUNDAY MORNING AS A COMPLEX OF THUNDERSTORMS MOVES THROUGH THE AREA. DAMAGING WINDS AND LOCALLY HEAVY RAIN ARE POSSIBLE WITH THESE STORMS. THERE IS A SMALL CHANCE FOR THUNDERSTORMS TO REDEVELOP SUNDAY AFTERNOON...ALTHOUGH THERE IS A LOT OF UNCERTAINTY IF THEY WOULD BECOME SEVERE. THUNDERSTORMS ARE LIKELY AT TIMES NEXT WEEK. ALTHOUGH THERE IS MUCH UNCERTAINTY CONCERNING THE EXACT TIMES WHEN THE STORMS WILL OCCUR...THE OVERALL WEATHER PATTERN WILL BE FAVORABLE FOR THE STORMS TO PRODUCE HEAVY RAINFALL. A PROLONGED PERIOD OF VERY HUMID CONDITIONS IS ALSO LIKELY STARTING SUNDAY AND CONTINUING THROUGH MUCH OF NEXT WEEK. PERSONS WITH RESPIRATORY CONDITIONS OR IN POOR HEALTH MAY NEED TO CURTAIL OUTDOOR ACTIVITIES AT TIMES. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TONIGHT INTO SUNDAY MORNING. LMZ521-522-541>543-082030- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 330 PM CDT SAT AUG 7 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE MICHIGAN AND THE WATERS OF GREEN BAY. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TONIGHT. SOME OF THE STRONGER STORMS COULD PRODUCE HAZARDOUS CONDITIONS FOR SMALL CRAFT WITH GUSTY WINDS AND FREQUENT CLOUD TO WATER LIGHTNING STRIKES. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY A COMPLEX OF THUNDERSTORMS IS EXPECTED TO MOVE ACROSS THE AREA SUNDAY MORNING. THE STRONGEST STORMS IN THE COMPLEX COULD PRODUCE VERY STRONG WINDS AND CHOPPY SEAS ALONG WITH TORRENTIAL RAINS THAT WILL REDUCE VISIBILITIES BELOW ONE MILE FOR A PERIOD OF TIME. ADDITIONAL THUNDERSTORMS ARE ALSO POSSIBLE SUNDAY AFTERNOON. THUNDERSTORMS ARE ALSO LIKELY AT TIMES THROUGH THE NEXT WEEK. THE RETURN OF VERY HUMID AIR TO THE REGION COULD ALSO RESULT IN FOG AND HAZE AND PERIODS OF REDUCED VISIBILITIES OVER THE LAKE. ALWAYS BE SURE TO CHECK THE LATEST FORECAST FOR UPDATED INFORMATION BEFORE HEADING OUT ON THE WATER. ECKBERG/RDM
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 500 PM CDT SAT AUG 7 2010 WIZ037-038-048-049-072230- CALUMET-OUTAGAMIE-WAUPACA-WINNEBAGO- 500 PM CDT SAT AUG 7 2010 ...THUNDERSTORM APPROACHING APPLETON... AT 458 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A RAPIDLY DEVELOPING THUNDERSTORM SIX MILES SOUTHWEST OF APPLETON. THE STORM WAS MOVING EAST AT 30 MPH. WINDS TO 30 MPH...OCCASIONAL LIGHTNING AND BRIEF HEAVY DOWNPOURS ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... APPLETON BY 505 PM CDT... KAUKAUNA BY 520 PM CDT... ANOTHER STORM WAS DEVELOPING IN SOUTHEAST WAUPACA COUNTY. IF A STORM APPROACHES YOUR LOCATION...MOVE INSIDE. JKL
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 647 PM CDT SAT AUG 7 2010 WIZ013-073-080045- NORTHERN MARINETTE COUNTY-SOUTHERN MARINETTE COUNTY- 647 PM CDT SAT AUG 7 2010 ...STRONG STORM MOVING OVER MARINETTE COUNTY... AT 645 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 33 MILES NORTHWEST OF MARINETTE...MOVING SOUTHEAST AT 25 MPH. PENNY SIZE HAIL...WINDS GREATER THAN 40 MPH...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... WAUSAUKEE... MIDDLE INLET... LOOMIS... MCALLISTER... PORTERFIELD... MARINETTE... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. MPC
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
658 PM CDT SAT AUG 07 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0655 PM HAIL 3 WSW ATHELSTANE 45.41N 88.15W
08/07/2010 E0.50 INCH MARINETTE WI TRAINED SPOTTER
AND WINDS ESTIMATED 35 TO 40 MPH.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
724 PM CDT SAT AUG 07 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0720 PM TSTM WND GST MIDDLE INLET 45.29N 88.00W
08/07/2010 E40 MPH MARINETTE WI PUBLIC
VERY HEAVY RAIN--CARS PULLED OFF THE HIGHWAY.
&&The Green Bay radar (KGRB), 79 km away, was scanning. The volume nearest the first event began at 00:49 UTC.
6 thunderstorm wind, 1 hail. Local standard time, as filed.
Thunderstorm winds of 50 to 60 mph uprooted three large trees near Porterfield.
Thunderstorm winds knocked trees onto a house.
Strong winds also blew a large blue spruce tree onto a tavern.
More than a dozen trees were knocked down by thunderstorm winds near Harshaw. The weather observer also measured 2.47 inches of rain during the storm.
Numerous trees were blown down by thunderstorm winds near the intersection of State Highway 17 and County Road A south of Rhinelander. Time of report is estimated.
Thunderstorm winds knocked several trees onto a shed and a garage in the Town of Maine.
Several trees and tree limbs were blown down on County Road PP in Potter.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2010Every state in 2010This day in weather historyWarnings in Wisconsin, August 2010
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: 257681, 257685, 257677, 257687, 257688, 257689, 257692.