A thunderstorm complex moved across southern Wisconsin overnight. Storms on the north end of the complex produced isolated wind damage in Stevens Point.
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 thunderstorm complex moved across southern Wisconsin overnight. Storms on the north end of the complex produced isolated wind damage in Stevens Point.
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 20, 9:01 PM CST, 4 hours 29 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 1001 PM CDT TUE SEP 20 2016 Updated aviation portion for 06Z TAF issuance .UPDATE... Issued at 808 PM CDT Tue Sep 20 2016 Short term progs not handling ongoing convection this evening so far. Activity more focused over Wisconsin in the elevated region of the mid level baroclinic zone. Very strong shear aloft which is making the elevated convection a bit more robust. One half inch hail reported around 745 pm near Eau Claire. In addition mesoanalysis shows a little instability starting to work into the mid level baroclinic zone region, therefore the potential of any diminishing trend appears less before convection to the west works in late tonight. Already expanded TSRA mention this evening. Best instability still over Iowa and vicinity near the surface warm front, but no convection noted at this time in this area. UPDATE Issued at 657 PM CDT Tue Sep 20 2016 isolated convection quickly developed along the mid level baroclinic zone from northwest wisconsin to near door county. Added a period of Isolated storms north of a auw to grb line. Convection likely be aided by a passing upper jet let as the Water vapor loops shows a weak impulse sliding over the state. Anticipate this convection to diminish or slide to the east later this evening, with attention turning to the west where the stronger waa and warm front is located. As of 7 pm...no convection noted toward Iowa and vicinity. && .SHORT TERM...Tonight and Wednesday Issued at 313 PM CDT Tue Sep 20 2016 The main concerns during the short term are onset of rain, possibly heavy, and the risk of severe storms. High and middle clouds made their way across much of northern Wisconsin today. There were some radar echoes showing up in the north but their height suggests that they may just be some middle clouds since observation sites in north central Wisconsin had no rain but did have some 10-12kft clouds. 12Z models indicated that the main rainfall event for the forecast area will not be until after 06z. Showers and thunderstorms moved across Minnesota today but they were weakening as they moved into western Wisconsin. Expect development overnight as a warm front to the southwest of Wisconsin pushes northeast and encounters some mid level instability. There is also some weak upper level short wave energy that will contribute to the development of showers and storms. The front will remain nearly stationary across southern Wisconsin through Wednesday, with continued chances for showers and thunderstorms across the entire area. Models have the highest overnight QPF values across central and east central Wisconsin, but totals do not look like anything to be too concerned about at the moment. Moisture increases on Wednesday so rainfall totals should be heavier then. Low wet bulb zero heights, as seen on the 12Z GRB sounding, make large hail the primary severe threat for tonight. .LONG TERM...Wednesday Night Through Tuesday Issued at 313 PM CDT Tue Sep 20 2016 Conditions are coming together for a heavy rainfall event on Wednesday night, with a warm front setting up just to our south, a low-level jet increasing to 30 to 35 kts, and short-wave and jet energy moving through the region. In addition, elevated instability will be in place, along with PWATs of 1.5 to 2 inches. We could see 2+ inches of rainfall in parts of central WI. The threat of locally heavy rainfall will continue across mainly central and east central WI Thursday into Thursday night, though amounts should not be as significant as Wednesday night. Event total rainfall (through Friday) of 2-4 inches, with local higher amounts, can be expected over parts of central WI, especially Marathon, Wood and Portage counties, and this would appear to be the area of greatest threat for localized flooding. Right now, confidence is not high enough in the placement and amount of heavy rainfall to issue a Flash Flood Watch, though issuance is possible with subsequent forecasts. The cold front will gradually sag south of the region Friday into Friday night, with Canadian high pressure settling into the Lake Superior region. This will cause a decrease in shower activity, especially over northern WI, where a brief period of dry weather may occur. Upper level ridging may also suppress precipitation Saturday into Saturday night, though confidence is not high enough to go with a completely dry forecast. A frontal system will spread showers and thunderstorms back into our western counties Sunday afternoon, and across the rest of the region Sunday night into Monday. Mainly dry conditions are anticipated Monday night and Tuesday Near normal temperatures are expected through most of the period. && .AVIATION...for 06Z TAF Issuance Issued at 1001 PM CDT Tue Sep 20 2016 Elevated convection continues across the region late this evening. The convection was primarily focused in the mid level baroclinic region from Northwest Wisconsin around Wausau to Door County. Stronger convection initiating over southern Minnesota just north of the surface warm front. This convection may attempt to intercept the deeper moisture with surface dewpoints in the 70s over Iowa. Convection over Wisconsin may linger due to strong shear and some marginal instability has worked into the area. Even with all the convection over the area, cigs were still around 10000 feet AGL with 10 mile vsbys with the light convection. Possibly cigs and vsbys will lower over Central Wisconsin later tonight if southern Minnesota convection reaches the area. Periods of convection will continue into Wednesday. && .HYDROLOGY... Issued at 313 PM CDT Tue Sep 20 2016 The primary focus will be on central WI, where total rainfall of 2-4 inches, with local higher amounts, is currently forecast during the late tonight through Friday period. At this time, it appears the greatest concern for flooding will be over Marathon, Wood and Portage counties. Parts of these counties have heavier soils that are more conducive to runoff, as well as a couple of our more flash flood-prone rivers (Big Eau Pleine and Yellow). Confidence is not high enough in the placement and amounts of heaviest QPF to issue a Flash Flood Watch at this time, but it is possible that a watch may need to be issued with subsequent forecasts. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && UPDATE.........TDH SHORT TERM.....MG LONG TERM......Kieckbusch AVIATION.......TDH HYDROLOGY......Kieckbusch
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 334 PM CDT TUE SEP 20 2016 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-212045- VILAS-ONEIDA-FOREST-FLORENCE-NORTHERN MARINETTE COUNTY-LINCOLN- LANGLADE-MENOMINEE-NORTHERN OCONTO COUNTY-DOOR-MARATHON-SHAWANO- WOOD-PORTAGE-WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE-WAUSHARA-WINNEBAGO- CALUMET-MANITOWOC-SOUTHERN MARINETTE COUNTY- SOUTHERN OCONTO COUNTY- 334 PM CDT TUE SEP 20 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TONIGHT THERE IS A CHANCE OF THUNDERSTORMS LATE TONIGHT, AS A WARM FRONT LIFTS NORTH TOWARD THE REGION. ISOLATED SEVERE THUNDERSTORMS WITH LARGE HAIL AND HEAVY RAINFALL ARE POSSIBLE IN CENTRAL WISCONSIN. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY SEVERAL ROUNDS OF THUNDERSTORMS ARE EXPECTED FROM WEDNESDAY INTO THURSDAY NIGHT. THE PRIMARY THREAT WILL BE HEAVY RAINFALL AND LOCALIZED FLOODING. RAINFALL AMOUNTS OF 1 TO 4 INCHES ARE ANTICIPATED ACROSS OF THE AREA. THE HIGHEST RAINFALL AMOUNTS AND GREATEST RISK OF FLOODING ARE CURRENTLY EXPECTED OVER MARATHON, WOOD AND PORTAGE COUNTIES. THERE IS ALSO A CHANCE OF THUNDERSTORMS FROM FRIDAY THROUGH MONDAY, BUT THESE STORMS ARE NOT EXPECTED TO BE SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTERS SHOULD REPORT ANY OCCURRENCES OF HAIL TONIGHT, AND ANY RAINFALL AMOUNTS IN EXCESS OF AN INCH OVER THE REMAINDER OF THE WORK WEEK. LMZ521-522-541>543-212045- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 334 PM CDT TUE SEP 20 2016 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. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY THUNDERSTORMS MAY POSE A SIGNIFICANT HAZARD TO MARINERS AT TIMES FROM WEDNESDAY THROUGH THURSDAY NIGHT. THESE STORMS WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL. ADDITIONAL CHANCES FOR STORMS EXIST FROM FRIDAY THROUGH MONDAY. THE STORMS MAY CREATE HAZARDOUS CONDITIONS FOR BOATERS. MG/KIECKBUSCH
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
1237 AM CDT WED SEP 21 2016
WIZ030-035-210630-
WOOD WI-MARATHON WI-
1237 AM CDT WED SEP 21 2016
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MARATHON AND NORTHERN
WOOD COUNTIES UNTIL 130 AM CDT...
AT 1236 AM CDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS
ALONG A LINE EXTENDING FROM NEAR GREENWOOD TO NEILLSVILLE. MOVEMENT
WAS EAST AT 35 MPH.
HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.
STRONG THUNDERSTORMS WILL BE NEAR...
SPENCER AROUND 100 AM CDT.
ABBOTSFORD AROUND 105 AM CDT.
MARSHFIELD AROUND 115 AM CDT.
OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE ATHENS...POWERS
BLUFF COUNTY PARK...BIG EAU PLEINE COUNTY
PARK...LINDSEY...BETHEL...RIB FALLS... HAMBURG...FENWOOD...HEWITT
AND AUBURNDALE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH
FLOODED ROADWAYS.
THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
STATIONS AND AVAILABLE TELEVISION STATIONS FOR ADDITIONAL INFORMATION
AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
&&
LAT...LON 4503 9031 4503 9020 4511 9020 4511 8981
4469 8982 4468 8985 4443 8983 4445 9031
TIME...MOT...LOC 0536Z 256DEG 29KT 4482 9056 4455 9058
KURIMSKISPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 159 AM CDT WED SEP 21 2016 WIZ045-210800- WAUSHARA WI- 159 AM CDT WED SEP 21 2016 ...SIGNIFICANT WEATHER ADVISORY FOR WAUSHARA COUNTY UNTIL 300 AM CDT... AT 158 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10 MILES NORTHEAST OF FRIENDSHIP...MOVING EAST AT 35 MPH. NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... WAUTOMA AROUND 235 AM CDT. REDGRANITE AROUND 250 AM CDT. OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE HANCOCK...TUSTIN... SAXEVILLE...POY SIPPI...AURORAVILLE...SPRING LAKE...WEST BLOOMFIELD... DAKOTA...PINE RIVER AND COLOMA. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 4398 8960 4424 8960 4424 8889 4398 8889 TIME...MOT...LOC 0658Z 264DEG 37KT 4408 8968 ECKBERG
The Green Bay radar (KGRB), 115 km away, was scanning. The volume nearest the first event began at 07:29 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds downed three trees and power lines in Stevens Point.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2016Every state in 2016This day in weather historyWarnings in Wisconsin, September 2016
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: 660114.