Thunderstorms that developed in a very moist environment produced heavy rain of 1 to 2 inches per hour leading flash flooding. The storms also produced a funnel cloud near Oshkosh.
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 that developed in a very moist environment produced heavy rain of 1 to 2 inches per hour leading flash flooding. The storms also produced a funnel cloud near Oshkosh.
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 Jul 19, 2:23 AM CST, 9 hours 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 323 AM CDT MON JUL 19 2010 .SHORT TERM...TODAY/TONIGHT/TUESDAY. ISOLATED CONVECTION LINGERED OVERNIGHT OVER MAINLY NORTHERN WI WITH SURFACE DEW POINTS STILL IN THE UPPER 50S NORTH TO MID 60S CENTRAL WHILE THE WV LOOP SUGGESTS SOME SOME MID LEVEL INSTABILITY PASSED OVER WITH AN UPPER JETLET. THIS PATTERN WILL BE VERY SIMILAR THROUGH TUESDAY AS THE WESTERLY FLOW WILL DOMINATE THE REGIONS WEATHER. NEXT MAIN IMPULSE PROGGED TO AFFECT THE UPPER MIDWEST TODAY INTO TONIGHT. PROGS INDICATE CONVECTION TO CONTINUE TO DEVELOP OVER SD TODAY ALONG A FRONTAL BOUNDARY THEN RIDE ALONG THAT BOUNDARY THIS AFTERNOON INTO IOWA AND FAR SOUTHERN MN BEFORE DRIFTING INTO SOUTHERN WI AND NORTHERN IL THIS EVENING. MODELS NOT INITIALIZING WELL THIS AM OVER IOWA AS CONVECTION ALREADY FIRING UP ALONG THE BOUNDARY OVER IOWA THIS MORNING. NOT SURE ON THE OUTCOME OF THIS FASTER DEVELOPMENT AHEAD OF THE MAIN WAVE...BUT AT THIS TIME SYSTEM MAY TRACK A BIT FASTER THEN PROGGED. IN GENERAL PROGS ARE INDICATING THIS SYSTEM WILL BRUSH THE SOUTHERN TIER OF THE FORECAST AREA TONIGHT FOR THE BEST CHC POPS IN THE AREA THROUGH TUESDAY. IT APPEARS THE NAM IS QUITE A BIT NORTH WITH THE PCPN TNT DUE TO SLIGHTLY DISPLACED UPPER JET TO THE NORTH. WILL GO WITH THE GFS AND ECMWF MORE SOLUTION FOR NOW. A WEAK SURFACE HIGH PRESSURE WILL DRIFT OVER THE REGION TODAY AND THEN AGAIN TUESDAY AFTER THE FRONTAL WAVE PASSES SOUTHEAST LATE TONIGHT. WILL NEED TO MENTION AT LEAST ISOLATED TYPE VARIETY AS THE AIR COLUMN REMAINS MOIST. INSTABILITY OVERALL MARGINAL OVER MOST OF THE AREA THROUGH THIS PERIOD...WITH BETTER INSTABILITY CONFINED SOUTH OF THE FORECAST AREA NEAR THE FRONTAL BOUNDARY AND DEEPER MOISTURE...AND ALSO ACROSS FAR NORTHERN WI TUESDAY AND POINTS NORTHWARD WHERE COOLER AIR ALOFT IS LOCATED. BUT JETLETS PASSING OVER IN THE BROAD UPPER JET FLOW OVER THE REGION WILL PROVIDE A MECHANISM TO DEVELOP ISOLATED CONVECTION IN THIS MOIST AND MARGINALLY UNSTABLE AIR MASS. LINGERING MOISTURE AND LIGHT WINDS WERE PRODUCING FOG AND STRATUS THIS AM...WITH LOCALLY DENSE FOG. EARLY THIS AM THE FOG WAS NOT WIDESPREAD ENOUGH AT THIS TIME FOR AN ADVISORY BUT WILL ISSUE A SPS IN A FEW HOURS FOR THE MORNING COMMUTE. .LONG TERM...TUESDAY NIGHT THROUGH THROUGH NEXT SUNDAY. ZONAL UPPER FLOW WILL CONTINUE THROUGH THE PERIOD WITH THE MODELS SUGGESTING A DECENT SHORTWAVE MOVING THROUGH FRIDAY NIGHT THAT MIGHT ACTUALLY BRING US DRIER AIR FOR THE WEEKEND. JET STREAKS MOVING THROUGH THE UPPER FLOW WILL CAUSE A SURFACE FRONTAL BOUNDARY TO MEANDER NORTH AND SOUTH ACROSS THE REGION AND CONTINUE TO PRODUCE PERIODIC RAINS. DEWPOINTS IN THE 70S ARE NOT VERY FAR TO THE SOUTH. SO THERE IS THE POTENTIAL OF HEAVY RAINS THIS WEEK. THE PERIODS WITH THE HIGHEST POTENTIAL FOR SIGNIFICANT RAINS APPEAR TO BE THURSDAY AND FRIDAY NIGHT...BUT NOT EXTREMELY CONFIDENT DUE TO THE INHERENT DIFFICULTIES OF TIMING SYSTEMS IN ZONAL FLOW. TEMPERATURES WILL LIKELY EXHIBIT A REDUCED DIURNAL RANGE DUE TO THE AMOUNT OF MOISTURE IN THE AIR AND A DECENT AMOUNT OF CLOUDS. SO EXPECT WARMER LOWS THAN USUAL ON MOST DAYS AND HIGHS A LITTLE ABOVE CLIMATOLOGY IF THERE IS SUNSHINE AND A FEW DEGREES COOLER IF IT/S CLOUDY. && .AVIATION...MVFR CIGS WITH SCT IFR/CIGS AND VSBYS DUE TO STRATUS AND DENSE FOG WILL PERSIST THIS MORNING. VFR CONDITIONS WILL THEN DEVELOP LATER MORNING THROUGH THE AFTERNOON. SCT MVFR CIGS AND VSBYS WILL THEN DEVELOP TONIGHT AS CONVECTION PASSES OVER TONIGHT. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && TDH/RDM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 539 AM CDT MON JUL 19 2010 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-201045- 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- 539 AM CDT MON JUL 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TODAY AND TONIGHT PATCHY DENSE FOG WILL LINGER TO AROUND 8 AM BEFORE DISSIPATING. MOTORISTS SHOULD BE ALERT FOR RAPIDLY REDUCED VISIBILITIES TO LESS THAN 1/4 MILE DURING THE MORNING COMMUTE. THEIR IS A SMALL CHANCE FOR THUNDERSTORMS THIS AFTERNOON AND TONIGHT. SINCE THE AIR MASS IS MARGINALLY UNSTABLE...SEVERE STORMS ARE NOT EXPECTED. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THROUGH WEDNESDAY THE MOST UNSTABLE AIR MASS WILL REMAIN OVER FAR SOUTHERN AND SOUTHWEST WISCONSIN AND AREAS SOUTHWARD NEAR A FRONTAL BOUNDARY. ANY STORM WHICH CAN DEVELOP OVER NORTH-CENTRAL AND NORTHEAST WISCONSIN THROUGH WEDNESDAY IS EXPECTED TO BE BELOW SEVERE LEVELS DUE TO THE MARGINAL INSTABILITY IN PLACE. HOWEVER LATEST INFORMATION INDICATES THIS FRONTAL BOUNDARY MAY LIFT NORTHWARD INTO WISCONSIN LATER THIS WEEK. THIS SCENARIO WOULD INCREASE THE POTENTIAL OF SEVERE STORMS. BE SURE TO MONITOR LATER FORECASTS THIS WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. LMZ521-522-541>543-201045- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 539 AM CDT MON JUL 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE MICHIGAN AND THE WATERS OF GREEN BAY. .DAY ONE...TODAY AND TONIGHT FOG...LOCALLY DENSE...WILL LINGER THIS MORNING. THEIR IS A SMALL CHANCE FOR THUNDERSTORMS THIS AFTERNOON AND TONIGHT. SINCE THE AIR MASS IS MARGINALLY UNSTABLE...SEVERE STORMS ARE NOT EXPECTED. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THROUGH WEDNESDAY THE MOST UNSTABLE AIR MASS WILL REMAIN OVER FAR SOUTHERN AND SOUTHWEST WISCONSIN AND AREAS SOUTHWARD NEAR A FRONTAL BOUNDARY. ANY STORM WHICH CAN DEVELOP OVER THE AREA THROUGH WEDNESDAY IS EXPECTED TO BE BELOW SEVERE LEVELS DUE TO THE MARGINAL INSTABILITY IN PLACE. HOWEVER LATEST INFORMATION INDICATES THIS FRONTAL BOUNDARY MAY LIFT NORTHWARD INTO WISCONSIN LATER THIS WEEK. THIS SCENARIO WOULD INCREASE THE POTENTIAL OF SEVERE STORMS. BE SURE TO MONITOR LATER FORECASTS THIS WEEK. TH/RDM
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 800 AM CDT MON JUL 19 2010 WIZ013-020>022-031-037>040-048>050-073-074-191400- NORTHERN MARINETTE-MENOMINEE-NORTHERN OCONTO-DOOR-SHAWANO-WAUPACA- OUTAGAMIE-BROWN-KEWAUNEE-WINNEBAGO-CALUMET-MANITOWOC- SOUTHERN MARINETTE-SOUTHERN OCONTO- INCLUDING THE CITIES OF...KESHENA...STURGEON BAY...APPLETON... GREEN BAY...ALGOMA...OSHKOSH...CHILTON...TWO RIVERS...CRIVITZ 800 AM CDT MON JUL 19 2010 ...FOG ACROSS PORTIONS OF EASTERN WISCONSIN THIS MORNING... PATCHES OF DENSE FOG CONTINUED IN EASTERN WISCONSIN THIS MORNING. THE FOG WAS SHIFTING SLOWLY WEST...BUT WAS STARTING TO DISSIPATE NOW THAT THE SUN IS UP. AT 755 AM...THE LOWEST VISIBILITIES... BELOW 1/4 MILE AT TIMES...WERE OCCURRING IN A BAND FROM CLINTONVILLE TO SHAWANO TO IRON MOUNTAIN. ELSEWHERE ACROSS THE AREA...THE FOG WAS PATCHY...AND VISIBILITIES WERE BETTER. CONDITIONS SHOULD CONTINUE TO IMPROVE RATHER RAPIDLY THIS MORNING. UNTIL THEN...MOTORISTS SHOULD BE ALERT FOR REDUCED VISIBILITIES IN POCKETS OF DENSE FOG. SKOWRONSKI
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 1139 AM CDT MON JUL 19 2010 WIZ038-191745- OUTAGAMIE- INCLUDING THE CITY OF...APPLETON 1139 AM CDT MON JUL 19 2010 ...THUNDERSTORMS WITH HEAVY RAIN IN CENTRAL OUTAGAMIE COUNTY... A SMALL CLUSTER OF THUNDERSTORMS WAS LOCATED OVER CENTRAL OUTAGAMIE COUNTY. AT 1135 AM...RADAR SHOWED THE CLUSTER CENTERED JUST TO THE WEST OF BLACK CREEK. LITTLE MOVEMENT WAS INDICATED. BECAUSE OF THE HUMID AIR IN PLACE ACROSS THE AREA...THE THUNDERSTORMS WILL DROP LOCALLY HEAVY RAIN. A FEW LOCATIONS JUST WEST OF BLACK CREEK COULD RECEIVE 2 TO 3 INCHES OF RAIN. DO NOT DRIVE YOU VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. SKOWRONSKI
The Green Bay radar (KGRB), 27 km away, was scanning. The volume nearest the first event began at 17:27 UTC.
1 flash flood, 1 funnel cloud. Local standard time, as filed.
Two inches of rain fell in an hour flooding 4 blocks of downtown Black Creek and 30 basements. State Highway 54 had to be closed due to 4 feet of standing water on the road.
A funnel cloud was spotted southeast of Oshkosh over Lake Winnebago.
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, July 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: 252456, 252455.