Marine Weather and Tide Forecast for Port Washington, WI

SHORT TERM
Issued 218 PM CST Tue Jan 14 2025

Tonight through Wednesday night:

Mostly clear skies and easing winds are expected tonight under high pressure. Went a bit below the average of models for temps tonight given these conditions favorable for decent radiational cooling. Temps aloft will begin warming up a bit by the second half of the night, which may inhibit the cooling at the surface some, so didn't go as low as some of the colder model solutions.

Mostly sunny skies should prevail through at least the first part of Wednesday under the influence of the high. Clouds will increase later in the day, with southwest winds picking up as the high slides southward ahead of an approaching trough. Temps will remain below normal tomorrow, but will be about 10 degrees milder than today given the warm air advection and southwest low level flow.

Bumped precip chances up to the 30-50% range for most places Wednesday evening/night, as the shortwave moves through. Model soundings are showing at least a couple hours of decent saturation with moderate forcing, so confidence is increasing in the potential for a dusting of snow. This is backed up by GFS and ECMWF ensemble 24 hour probs for measurable precip in the 40-80% range during this period.

DDV

LONG TERM
Issued 218 PM CST Tue Jan 14 2025

Thursday through Tuesday:

Weak upper level ridging will build into the area Thursday into Thursday night, with southerly low level flow developing Thursday night into Friday between departing surface high pressure and an approaching trough. This pattern will result in above normal temperatures Thursday and Friday, with most places expected to crack 40 by Friday. Could see a little precip later Friday into Friday night (likely in the form of rain) as the cold front and surface trough swing through, though the better moisture and high precip chances are expected to be south of the area.

Temps aloft are expected to crash Saturday into early next week behind the departed low pressure system, as an arctic high builds in from the northwest. This is expected to be the coldest airmass of the season thus far, with high temps by Monday struggling into the low to mid single digits, with multiple nights of subzero temps. Wind chills are expected to be in the -15 to -25 range much of the time from later Saturday night into Tuesday morning. The coldest conditions are likely Sunday night into Monday morning, when wind chills could approach -30 in spots. Dry weather is likely over the weekend into early next week.

DDV

AVIATION
Issued 218 PM CST Tue Jan 14 2025

Mostly clear skies are expected tonight into Wednesday under high pressure. Breezy northwest winds this afternoon will become westerly and light tonight under the high, with southwest winds gradually picking up on Wednesday as the high departs ahead of an approaching trough. Clouds will increase later Wednesday into Wednesday night, with a dusting of snow possible Wed evening/night as a shortwave moves through. Breezy southwest winds are expected Wed night as well.

DDV

MARINE
Issued 218 PM CST Tue Jan 14 2025

High pressure of 30.6 inches centered near the border of the Dakotas and Minnesota, will slide southeast to the western Ohio River Valley by Wednesday morning. This will result in breezy northwest winds this afternoon easing a bit and becoming westerly overnight. Breezy southwest winds are then expected to develop later Wednesday into Wednesday night between the high to the south and low pressure of 29.5 inches moving east through northern Ontario. Gusts to 30 knots are expected Wednesday evening into Wednesday night, with a few gusts to gale force possible in the north. A Small Craft Advisory will likely be needed for this period.

Winds will be a bit lighter out of the northwest Thursday behind a departing trough, but will remain breezy. Winds will then return to southwesterly on Friday ahead of the next low pressure system, with a chance for gales during this period, especially across the north half of the lake.

Much colder temperatures are expected to return to the area this weekend into early next week, with a period of freezing spray likely, especially across the eastern half of the lake.

DDV

MKX WATCHES/WARNINGS/ADVISORIES
WI...None.
LM
Small Craft Advisory
LMZ643-LMZ644-LMZ645-LMZ646 until 3 pm Tuesday.