Thunderstorms brought heavy rainfall and some small hail as they moved across eastern Wisconsin. One of the storms produced a narrow funnel cloud in eastern Brown County when it encountered a lake breeze.
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The episode as NWS GRB wrote it up.
Thunderstorms brought heavy rainfall and some small hail as they moved across eastern Wisconsin. One of the storms produced a narrow funnel cloud in eastern Brown County when it encountered a lake breeze.
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 Jun 17, 1:26 PM CST, 1 hour 34 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 226 PM CDT Sat Jun 17 2017 Forecast discussion for routine afternoon forecast issuance .SHORT TERM...Tonight and Sunday Issued at 226 PM CDT Sat Jun 17 2017 The latest RAP analysis and satellite/radar imagery show a weak cold front/surface trough positioned over eastern WI early this afternoon. Cu has been building through the day along the front, and wouldnt be surprised to see a few showers pop up. Cu is more robust over northern WI and the Upper Peninsula, where showers appear to be a slightly better bet though. Looking to the west, showers and thunderstorms are popping along a cold front over northern Minnesota. Scattered showers and storms are also pushing east over the northern Plains ahead of a potent shortwave trough. As this trough moves east across the region tonight, precip trends are the main forecast concern. Tonight...The strong shortwave trough will continue to move east and into the region late this evening and overnight. Meanwhile, the cold front over Minnesota will slide southeast into northern WI late tonight. Lingering daytime instability may still contribute to isolated showers/storms over northern WI early in the evening. But the latest short term guidance indicates that more widespread shower and isolated thunderstorms will push into central and north-central WI from the west by 02-04z. Elevated instability by this time will be up to 500 j/kg, so think severe chances are very low. Track of the shortwave and associated deformation zone will call for the heaviest precip north and west of the Fox Valley late tonight. Amounts could reach up to an inch over north-central WI, which will exacerbate the higher water levels on area rivers. Precip does not appear to make it into eastern WI until after midnight, and should be considerably less than areas to the northwest. Low temps ranging from the mid 50s north to low to mid 60s south. Sunday...The shortwave will swing northeast across the area during the morning before exiting in the afternoon. Widespread rain will be ongoing across northern WI for much of the morning before exiting early in the afternoon. However, a trailing shortwave interacting with minor instability could still lead to scattered showers during the rest of the afternoon over much of the area. Much cooler highs ranging from the mid 60s to mid 70s. .LONG TERM...Sunday Night Through Saturday Issued at 226 PM CDT Sat Jun 17 2017 The long term will feature off and on showers and thunderstorm chances as the Great Lakes region remains in a NW flow regime, with waves of energy rotating around the upper trough over eastern Ontario. Hard to time the best chances for precip, so will continue to feature chance or slight chance POPs from Sunday night through Tuesday. Models showing the upper pattern becoming more zonal on Wednesday, with brief ridging building over the western Great Lakes, which looks to provide the best chance for a dry day. However, models showing a wave crossing near the Canadian border that could touch of an area of showers and storms later on Wednesday. Again, timing these features this far out is a challenge, but will try to get at least a couple dry periods Tuesday night into Wednesday, then bring back chances for rain/storms on Wednesday into Wednesday night. Northwest flow will keep temps below normal through mid-week then near or slightly above normal temps should return toward the end of the week. && .AVIATION...for 18Z TAF Issuance Issued at 1138 AM CDT Sat Jun 17 2017 VFR conditions and generally quiet weather are anticipated across the region this afternoon, with only isolated showers/storms along the Lake Michigan lake breeze, and also over north-central WI. Showers and scattered thunderstorms will increase across the region by mid to late evening, as a strong upper level disturbance moves through. Ceilings are expected to lower to MVFR/IFR over north central and central WI late, and visibilities will be reduced at times due to steadier/heavier rainfall. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM.....MPC LONG TERM......Bersch AVIATION.......MPC
Hazardous Weather Outlook National Weather Service Green Bay WI 231 PM CDT Sat Jun 17 2017 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-181945- 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- 231 PM CDT Sat Jun 17 2017 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Tonight There is a chance of thunderstorms across the region this tonight. The risk of severe weather is low, though some storms could contain brief gusty winds and small hail. Due to recent heavy rains, many streams and rivers are flowing faster than normal, and a few are above flood stage. Boaters and fishermen should use caution due to fast flows. .DAYS TWO THROUGH SEVEN...Sunday through Saturday Thunderstorms are expected at times through the period, especially during the afternoon hours. However, it is too early to determine their severe potential. .SPOTTER INFORMATION STATEMENT... Spotter activation should not be needed tonight. LMZ521-522-541>543-181945- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 231 PM CDT Sat Jun 17 2017 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Tonight There is a slight chance for thunderstorms tonight, but organized severe weather is not expected. .DAYS TWO THROUGH SEVEN...Sunday through Saturday Thunderstorms will be possible at times through much of the period. These storms may pose a hazard to mariners. MPC/Bersch
Special Weather Statement
National Weather Service Green Bay WI
354 PM CDT SAT JUN 17 2017
WIZ039-040-172145-
Kewaunee WI-Brown WI-
354 PM CDT SAT JUN 17 2017
...THUNDERSTORM WITH HEAVY RAIN IN EASTERN BROWN AND WESTERN
KEWAUNEE COUNTIES...
At 352 PM CDT, Doppler radar was tracking a thunderstorm near
Denmark, or 11 miles southeast of Green Bay, moving east at 15 mph.
Very heavy rain, frequent lightning, and winds in excess of 30 mph
can be expected with this storm.
Locations impacted include...
Kewaunee, Algoma, Luxemburg, Denmark, Humboldt, Casco, Birchwood and
Curran.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall may lead to localized flooding. Do not drive
your vehicle through flooded roadways.
&&
LAT...LON 4454 8741 4435 8747 4434 8791 4451 8789
4462 8736
TIME...MOT...LOC 2052Z 258DEG 19KT 4442 8781
JKLThe Green Bay radar (KGRB), 25 km away, was scanning. The volume nearest the first event began at 20:58 UTC.
1 funnel cloud. Local standard time, as filed.
A narrow funnel cloud formed north of Denmark in eastern Brown County. The funnel was visible from other nearby counties.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2017Every state in 2017This day in weather historyWarnings in Wisconsin, June 2017
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: 706133.