Marine Weather and Tide Forecast for Fontana-on-Geneva Lake, WI

UPDATE
Issued 1025 PM CDT Sun Oct 13 2024

The core of the upper low will slide south and east over the next few hours along with an inverted surface trough, bringing steadier rain to the lakeshore counties.

Following the departure of the upper low and sfc trough during the early morning hours, a bit of subsidence should work in behind these features, generally suppressing shower activity near daybreak tomorrow, but a well defined lake effect rain band should take hold over the mid-lake region of Lake Michigan.

CMiller

SHORT TERM
Issued 240 PM CDT Sun Oct 13 2024

Tonight through Monday night:

A cold front associated with a digging trough over the Great Lakes brought gusty northwest winds and showers to the region today. Look for some additional scattered showers into this evening, before winds turn more northerly as an inverted trough sweeps through. A band of lake effect showers (and perhaps a few thunderstorms) will develop tonight and continue into Monday morning. Lows tonight will be in the upper 30s inland, with readings in the 40s closer to the lake.

By Monday afternoon precipitation will start to expand inland as another cold front approaches, this time from the northeast.
Rain chances will persist into late evening for inland areas, and will continue into Tuesday for areas near Lake Michigan, as the colder air behind the front reinvigorates the lake effect rain showers. Depending on the amount of clearing, some patchy frost will be possible tomorrow night/Tuesday morning west and northwest of Madison.

Boxell

LONG TERM
Issued 240 PM CDT Sun Oct 13 2024

Tuesday through Sunday:

Highs on Tuesday will be in the low 50s, with gusty north winds.
Lake effect rain showers will continue for locations near Lake Michigan. By Tuesday night, high pressure centered over Iowa will help scoot most of the lake effect rain to our east. With clearing skies and light winds, look for temperatures to drop into the 20s inland from Lake Michigan Tuesday night/Wednesday morning. Upper 20s are expected for most, but some mid 20s will be possible for areas west and north of Madison. Assuming no significant changes, a Freeze Watch will likely need to be considered by this time tomorrow.

Return flow behind the high and upper level ridging will result in a warming trend for the latter half of the workweek, with highs back into the 60s on Thursday, and near 70 Friday into the weekend.

Boxell

AVIATION
Issued 1026 PM CDT Sun Oct 13 2024

Continuing MVFR is expected late this evening into the early morning hours as an upper low pivots over Lake Michigan.
Steadier rain will move down the Lake Michigan shoreline, impacting KSBM, KMKE, KUES, and KENW, with more shower precipitation expected inland. Following the steadier rain, areas of showers will linger during the early morning hours, before showers subside near dawn on Monday.

Strong northwesterly winds with gusts between 25 to 30 knots will continue into the early morning hours, gradually easing in strength from northwest to southeast by 12z on Monday. Mild northwesterly breezes from 15 to 20 knots will continue until midday.

CMiller

MARINE
Issued 240 PM CDT Sun Oct 13 2024

A Gale Warning remains in effect through tonight for about the southern half of Lake Michigan and the nearshore waters, with occasional northwest to north gales to 35 knots expected.

Winds will be lighter on Monday, but will remain breezy out of the north behind departing low pressure and approaching high pressure over south-central Canada. The pressure gradient will tighten up Tuesday as the high moves closer, while low pressure remains fairly stationary over southeast Canada. Winds could reach gale force again Tuesday into Tuesday night over the open waters. A long duration Small Craft Advisory will likely be needed for the nearshore once the ongoing Gale Warning expires.

Along with the gales, there will be an elevated waterspout potential over most of the lake through Tuesday. Waterspouts will be especially likely Monday and Tuesday in and around any north to south bands of showers and thunderstorms.

Boxell

MKX WATCHES/WARNINGS/ADVISORIES
WI...None.
LM
Gale Warning
LMZ080-LMZ567-LMZ643-LMZ644-LMZ645-LMZ646- LMZ669-LMZ671-LMZ673-LMZ675-LMZ777-LMZ779-LMZ868-LMZ870- LMZ872-LMZ874-LMZ876-LMZ878 until 7 AM Monday.