Marine Weather and Tide Forecast for Kewaunee, WI

DISCUSSION
Issued at 308 PM CDT Fri Jun 13 2025

Widespread showers associated with an 850 mb warm front and 850-700 mb frontogenesis still covered most of northern WI this afternoon, but were gradually decreasing over north central WI. Rain-cooled air was holding temperatures in the upper 40s to middle 50s north, while readings had climbed into the upper 50s and lower 60s in parts of central and east central WI.

Precipitation Chances through the Weekend: Expect the more concentrated showers to exit far NE WI as forcing weakens this evening, though isolated to scattered showers may persist in the Northwoods well into the evening. A gradual increase in showers can be expected in NC WI late tonight into Saturday morning, as additional weak WAA/FGEN arrive. These showers will be of the light to moderate variety, and should become more scattered as they drift southeast during the day. The chance of showers persists Saturday night into Sunday, with an uptick in activity and even a few thunderstorms possible into our southwest counties as modest instability arrives Sunday afternoon. Canadian high pressure will continue to produce light to moderate easterly winds through the weekend, which when combined with periodic showers, will result in below normal temperatures across the Northwoods.

Stormy Period expected during the next Work Week: The Canadian high will shift east early next week, allowing for southerly winds to develop and bring warmer, more moist and unstable air into the region. A cold front will approach NW WI late Monday into Monday night, and may trigger a round of storms, which would then move into the forecast area. The front will edge eastward Tuesday into Wednesday, with possible rounds of convection developing as a couple short-waves move through the region, and a surface wave lifts north along the boundary on Wednesday.
Although timing is uncertain, this period has potential for severe weather, as a much more unstable air mass will be in place, and deep layer shear will be sufficient for storm organization. Storm chances are more uncertain later in the week, as models diverge.
This will be be a warmer and more humid period, at least through midweek.

AVIATION /00Z TAFS THROUGH 00Z SUNDAY/
Issued at 613 PM CDT Fri Jun 13 2025

IFR to MVFR ceilings will impact central into northern Wisconsin tonight into Saturday.

Widespread IFR/MVFR stratus will remain in place across the region tonight with some improvement expected on Saturday. The Fox Valley, including KGRB/KATW may reside on the southern edge of the lower stratus shield, so confidence is lower for cloud trends in this area. Both the NBM and 13.12Z HRRR show probabilities in the 30 to 50% at KGRB/KATW for MVFR ceilings at KATW/KGRB overnight into Saturday morning with a higher likelihood for VFR by afternoon. MVFR visibilities will be also be possible (40-60% chance) across parts of northern Wisconsin overnight.

Areas of showers will persist through the TAF period. Exact timing and coverage remains somewhat uncertain, but the higher chances (40-70%) are focused across central into northern Wisconsin overnight and Saturday.

Winds will remain easterly through Saturday.


GRB WATCHES/WARNINGS/ADVISORIES
WI...None.
MARINE...Small Craft Advisory until 10 PM CDT this evening for LMZ521- 522-541>543.