textproduct: Milwaukee/Sullivan

KEY MESSAGES

- A Winter Weather Advisory remains in effect into this morning for portions of southern Wisconsin. Accumulating snow will wind northwest to southeast early to mid-morning. Roads will be snow covered and slippery this morning.

- Additional rounds of snowfall will be possible again Monday night into Tuesday and Tuesday night into Wednesday, though this second system may see rain mix in. Any rain that falls could initially cause slick spots on roads given cold road temperatures.

- Additional rounds of snowfall are then possible through the end of the work week, but confidence in timing is much lower.

- Below normal temperatures continue through next weekend.

SHORT TERM

Issued 324 AM CST Sun Dec 7 2025

Today and Tonight:

Accumulating snowfall will wind down northwest to southeast early to mid-morning, exiting the southeast between 6 and 8 am. Snowfall rates will be highest early this morning east of a line from Madison to Monroe, with rates generally decreasing across the area towards daybreak. Expect snow covered roads this morning.

Clouds will gradually decrease behind the exiting snowfall, with a fair amount of sunshine expected through the day as high pressure builds in. Despite the sunshine, high temps will struggle into the upper teens to low 20s, well below normal for early December. Breezy northerly winds will result in wind chills of single digits above zero through the day.

Could see a dusting of snow for lakeshore areas tonight as winds turn onshore, which may bring a little lake effect snow inland. Amounts look low at this time, with up to a half an inch possible. Clouds are generally expected to increase overnight ahead of a weak shortwave. Temperatures may bottom out in the evening, before holding steady or possibly gradually rising overnight with the increased clouds and some weak warm air advection aloft.

DDV

LONG TERM

Issued 324 AM CST Sun Dec 7 2025

Monday through Saturday:

High pressure will bring dry and continued well below normal temps to the area Monday. A quick moving shortwave may bring a dusting of snow to southern Wisconsin Monday night as the high pushes eastward.

A stronger low pressure system is expected to move through the area later Tuesday into early Wednesday. Models continue to suggest a more northern track with this system, which could lead to a rain/snow mix, with the best chance for snow in the southern forecast area. After a long stretch of below freezing temperatures, rain could initially freeze on pavement, particulary any untreated roads. This system bears watching, as a shift farther north would result in mainly rain for southern Wisconsin, but a shift south could bring a decent shot of accumulating snowfall to at least the northern forecast area.

A colder airmass is then expected to quickly return to the area behind the low Wednesday night into Thursday. A pair of shortwaves late week will likely bring a return of snow chances to southern Wisconsin. Still a fair amount of uncertainty with the timing and strength of these systems.

DDV

AVIATION

Issued 324 AM CST Sun Dec 7 2025

Accumulating snowfall will wind down northwest to southeast early to mid-morning, exiting the southeast between 12Z and 14Z. Snowfall rates will be highest early this morning east of a line from Madison to Monroe, with rates generally decreasing across the area towards daybreak. The snow will remain on the drier side, with snow to liquid ratios of 14-17 to 1. Low ceilings and visibilities will persist with the accumulating snowfall, with a return to VFR conditions as clouds clear with the exiting snowfall. Could see a dusting of snow for lakeshore areas tonight as winds turn onshore, which may bring a little lake effect snow inland.

Winds will remain light this morning, but will pick up a bit out of the north by the afternoon, before becoming light and variable most places tonight under high pressure. Could see a dusting of snow for lakeshore areas tonight as winds turn onshore in the east, which may bring a little lake effect snow inland.

DDV

MARINE

Issued 324 AM CST Sun Dec 7 2025

Breezy northerly winds are expected today between weakening low pressure passing by well to the south and high pressure around 30.5 inches building in from the west. Winds will become lighter tonight under the high.

Winds will then shift to the south by Monday afternoon, as the high heads eastward ahead of an approaching low. The low around 29.7 inches will track from Minnesota to Sault Ste. Marie Monday night through Tuesday morning. A period of southerly gales up to 35 knots is looking more likely during this time, with gusts up to 40 knots possible over far northern Lake Michigan.

The next low around 29.1 inches will track across central Wisconsin Tuesday night and reach southern Ontario by midday Wednesday. Gales are possible for the south half of the lake during this time.

DDV

MKX WATCHES/WARNINGS/ADVISORIES

WI...Winter Weather Advisory...WIZ056-WIZ062-WIZ063-WIZ067-WIZ068- WIZ069 until 6 AM Sunday.

Winter Weather Advisory...WIZ064-WIZ065-WIZ066-WIZ070-WIZ071- WIZ072 until 8 AM Sunday.

LM...Small Craft Advisory...LMZ644...8 AM Sunday to 9 PM Sunday.

Small Craft Advisory...LMZ645-LMZ646...8 AM Sunday to 3 AM Monday.