Marine Weather and Tide Forecast for Necedah, WI

DISCUSSION
Issued at 223 AM CST Fri Jan 30 2026

Today through Saturday night

A strong shortwave trough will move south through the Northern Plains, Upper Mississippi River Valley, and the Great Lakes this morning. Like the past couple of days, the better moisture and lift is located along the baroclinic zone over the Northern Plains and over and downwind of the Great Lakes where conditions are ideal for lake effect snow bands. Meanwhile, in the Upper Mississippi, there is just enough low level moisture (up to 50 mb) for some snow flurries. The best chance for these flurries this morning will be along and south of the Interstate 90.

In the wake of this system, high pressure will build across the region and this will remain in control of the region's weather into Saturday night.

High temperatures will range from 5 to 15 degrees today and from 15 to 20 degrees on Saturday. Low temperatures will be mainly in the single digits below zero tonight and in the single digits above zero on Saturday night.

Sunday and Sunday night

The western longwave ridge will build east across the Upper Mississippi River Valley. As this occurs, our flow aloft will change from bringing Arctic air masses southeast and south into the area to bringing more Pacific air masses into the region.
As this transition occurs, there will be a band of snow that will move east through the region from late Saturday night into Sunday evening. The LREF continues to show that there is over a 90 percent chance for measurable snow (0.1 inches or greater) to occur. The probabilities for 1 inch or greater is up to 30 percent south of Interstate 90 and 30 to 50 percent chance across the remainder of the area. The highest members in the global ensembles are around 1.5 inches (up to 10 percent).

High temperatures on Sunday will be in the lower and mid-20s.
Low temperatures on Sunday night will range from 5 to 15 degrees.

Tuesday and Tuesday night

There is plenty of uncertainty on whether there will be phasing between the northern and southern streams. In addition, the speed of the northern stream system will greatly impact the snow totals. The slower solutions (44 percent of the members) with more ridging downstream have a 20 to 30 percent probability of at least 1.5 inches of snow or greater. Meanwhile, the remainder of the ensemble members show less downstream ridging as a result they have the northern stream trough moving through the region much faster. This results in only up to 10 percent of the these members producing at least 1.5 inches or greater.

High temperatures on Tuesday will be in the 20s. Low temperatures will range from 5 to 15 degrees.

Thursday through Friday

A northern stream shortwave trough will move southeast through the Upper Mississippi River Valley and Great Lakes. 79 percent of the global ensemble members have up to a 25 percent probability of 1.5 inches of snow or greater from along the Mississippi River east into Wisconsin. The greatest probabilities (40-80 percent) are located over northeast Wisconsin and Upper Michigan.

High temperatures on Thursday and Friday will range from the mid-20s to lower 30s. Low temperatures on Thursday night will range from the mid-teens to lower 20s.

AVIATION /18Z TAFS THROUGH 18Z SATURDAY/
Issued at 1051 AM CST Fri Jan 30 2026

VFR conditions are likely throughout the TAF period as winds will diminish slowly overnight with high pressure moving into the region.
Cannot rule out (under 20% in the HRRR) a period of sct to bkn MVFR later this evening as the recent HRRR has some saturation atop the mixed layer to around 2-3kft. Otherwise, north/northwesterly winds will begin the TAF period at around 8-12 kts but will decrease to under 8 kts overnight at most locations.

ARX WATCHES/WARNINGS/ADVISORIES
WI...None.
MN...None.
IA...None.