Marine Weather and Tide Forecast for Port Washington, WI

SHORT TERM
Issued 950 PM CDT Fri Jun 12 2026

Tonight through Saturday night:

A wswly low level jet of 30-40 kt will extend ewd across nrn IA, far srn MN, and into central WI tnt. Warm, moist advection and frontogenesis will continue to support showers and sct storms over the srn half of MN moving into central WI later this evening. A few of these showers may eventually clip MQT, Green Lake, Fond du Lac, and Sheboygan Counties during the overnight.

An additional area of showers and storms may then develop early Sat AM over ern NE as deeper moisture returns on the low level jet. The low level jet will weaken through the morning but scattered showers and storms may continue within the 850 mb frontogenetic zone that extends into central WI. The sfc-850 mb frontal zone will then slowly shift sewd across srn WI through the afternoon and evening, with its slow motion due to the late arrival of the upstream shortwave trough for Sun AM. MLCAPEs may rise to 1000 J/KG by mid to late afternoon while deep layer shear of 50 kt will be in place. This CAPE and shear combination could certainly support severe storms, but overall weak low level convergence and lack of dynamics aloft should limit the severe storm threat to the Marginal Risk that is outlooked. Rain chances of 20-40 percent are forecast for the early afternoon then transitioning to 60-70 percent along and south of a line from Cedarburg to just south of Madison to sw WI for late afternoon and early evening.

Gehring

LONG TERM
Issued 950 PM CDT Fri Jun 12 2026

Sunday through Thursday:

A shortwave trough will pass Sun AM with cold advection continuing much of the day along with broken cloud cover. Thus high temps are only forecast to rise into the upper 60s.

Additional shortwave troughs will continue to arrive next week on nwly flow aloft due to the large upper low over Ontario. The first well organized upper trough will bring rain chances of 60-80 percent Tue afternoon, but the second upper trough may result in cyclogenesis from the Great Plains into the Great Lakes or Ohio Valley for Wed-Wed nt. There is much uncertainty with the strength, placement, an overall evolution of the cyclogenesis, but rain chances will still remain high (60-80 percent). Temps will remain slightly below normal then rebounding late in the week.

Gehring

AVIATION
Issued 950 PM CDT Fri Jun 12 2026

Prevailing conditions of VFR is expected tnt into Sat evening but scattered showers and isolated storms may affect locations toward central WI early Sat AM. Additional scattered showers and thunderstorms will develop Sat afternoon and may become more widespread along and south of I-94 for late afternoon and evening. During this time, areas of MVFR Cigs may develop in the vicinity or wake of storms.

Gehring

MARINE
Issued 950 PM CDT Fri Jun 12 2026

Low pressure around 29.2 inches in the Hudson Bay will continue to bring modest to breezy southwest winds to Lake Michigan through Saturday. A cold front will then move north to south across the lake Saturday night, with winds become northwesterly and a bit gusty. Northwesterly winds will then gradually diminish on Sunday. Light southwest winds will then return on Monday before low pressure develops in the northern Great Plains and brings gusty south winds to the lake for Tuesday and Wednesday.
Winds may become very gusty going into Wednesday evening as low pressure crosses the northern half of the Lake. A few gales are possible. Winds then shift to westerly as low pressure exits on Thursday.

Gehring

MKX WATCHES/WARNINGS/ADVISORIES
WI...None.
LM...None.