Marine Weather and Tide Forecast for Reedsburg, WI

SHORT TERM
Issued 1220 AM CDT Tue Apr 14 2026

Tonight through Tuesday night:

A line of thunderstorms will roll through the forecast area over the next few hours, as low pressure approaches along a stalled frontal boundary. The main threat through 2-4 am will be damaging winds, though an isolated tornado will be possible.
Given sustained instability overnight along with WSW 0-3 km shear around 40 knots, any storm line segments that become more north/south oriented could bow out increasing the wind threat and also producing a QLCS tornado threat. The flooding concern remains overnight as well, as the line of storms across the northern forecast area slowly sags southward tonight, with some back building currently evident over southeast MN and northeast IA.

Storms may linger in the southeast forecast area towards around daybreak, with dry weather then likely through the morning hours. Attention then turns to another severe storm threat during the afternoon and evening hours. The stalled frontal boundary will be set up around the far northern forecast area in the afternoon, as another weak surface low and shortwave approach from the west. Plenty of instability is expected across at least the south half of the forecast area, with surface based CAPE of at least 3000 J/KG. Additionally, wind profiles look more than sufficient for severe storms as a 45 kt LLJ noses from the south by late afternoon. All severe hazards will be possible as storms initialize between 3 and 6 pm, with a decent chance for supercell development. Storms will likely eventually organize into line or two, with the severe threat leaning more towards wind and QLCS tornado at that point.
Locally heavy rainfall and flooding will be a concern as well, especially if storms roll through the same areas that received the heavier rainfall the last couple days. Adding to this concern as that some of the latest models do show that a line of storms may set up west to east across the southern half of the forecast area tomorrow night, with some training possible.

DDV

LONG TERM
Issued 1220 AM CDT Tue Apr 14 2026

Wednesday through Sunday:

It is still looking like the frontal boundary could remain far enough north on Wednesday for another severe storm threat. This will somewhat depend on what happens Tuesday/Tuesday night and where the effective front ends up because of that round of storms. Overall though, there is enough confidence to continue to message a severe threat, with locally heavy rainfall also a concern again.

Storms may linger Wednesday night into early Thursday, with a break in activity then likely Thu afternoon into at least Friday morning. Yet another round of storms is then possible Friday evening into Saturday morning as a cold front finally pushes through the region. The later timing of this front may somewhat diminish the severe threat, due to the better interaction with peak daytime heating Friday remaining to the west. Plenty of time though for timing to change, so this period remains worth keeping an eye on.

Much cooler conditions are expected to settle into the area this weekend behind the departing low and cold front. Highs will likely struggle to get out of the 40s by Sunday. It looks mainly dry Sat afternoon through Sunday, though not out of the question for a few snowflakes in the north Sat night as a shortwave rolls through.

DDV

AVIATION
Issued 1220 AM CDT Tue Apr 14 2026

A line of thunderstorms, potentially severe at times, is expected to continue to drop southeast through southern Wisconsin through around 09Z tonight. Damaging winds are the main concern, with a tornado not out of the question. Low level wind shear is likely this evening into tonight ahead of the thunderstorms. Lower ceilings (1500 to 3000 ft) and visibilities (2-5 miles) are anticipated as the line of storms move through.

A few storms may linger towards daybreak early Tue, with dry weather likely through the morning hours. Low clouds may take a good chunk of the morning to improve to VFR. Generally south to southwest winds are expected tomorrow, though a few models do show winds may turn onshore tomorrow near the lake by late morning.

Another round of thunderstorms is expected tomorrow by late afternoon or early evening, with the potential for severe storms once again.

DDV

MARINE
Issued 1220 AM CDT Tue Apr 14 2026

Shower and thunderstorm activity is expected across lake Michigan late into tonight as low pressure of 29.6 inches over southeast Minnesota continues to head northeast. Winds will be easterly north of a frontal boundary across roughly the northern half of the lake, with southerly winds expected in the south.
Then expecting another a couple passing low pressure system to develop in the Plains and track across Lake Michigan again on Tuesday and Wednesday. Each system will bring a chance for showers and thunderstorms through the middle of the week. Areas of dense fog will likely occur at times due to a relatively mild and humid airmass over the cold waters paired with lighter winds.

DDV

MKX WATCHES/WARNINGS/ADVISORIES
WI
Flood Watch
WIZ046-WIZ047-WIZ051-WIZ052-WIZ056-WIZ057-WIZ058- WIZ059-WIZ060 until 7 AM Tuesday.

LM
Dense Fog Advisory
LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565- LMZ567-LMZ643-LMZ644-LMZ645-LMZ646-LMZ669-LMZ671-LMZ673- LMZ675-LMZ868-LMZ870-LMZ872-LMZ874-LMZ876 until 7 AM Tuesday.