textproduct: Milwaukee/Sullivan

KEY MESSAGES

- Rain chances (~40-60%) return this evening evening. Snow may mix in at times over central WI.

- Increasing potential for pop-up snow showers Monday afternoon & evening, especially over east central WI. Some PM commute impacts caused by visibility drops, and light slushy accumulations on roadways possible.

- Active pattern continues Tuesday night into next weekend, with multiple additional chances for mainly rain and a few thunderstorms. Some wet snow is possible Tuesday night.

SHORT TERM

Issued 251 PM CDT Sun Apr 5 2026

Tonight through Monday night:

A weak front is expected to pass through the area late this evening bringing chances for rain provided enough saturation is reached through our dry low level. While forecast soundings support mostly rain, there is a bit of CAPE aloft, which could allow for isolated graupel or snow to mix in at times.

Following the front, breezy northwest winds will then linger into tomorrow. Another cold front is expected to sink south across the area, with the best convergence and lapse rates over east central to southeast WI. Convective snow showers are expected along the front and with deeper CAPE aloft, some brief half inch per hour rates may occur with some of the stronger snow showers, causing drops in visibility. Slushy accumulations on roads may also occur, although how much accumulation actually occurs on roads will be highly dependent upon pavement temperatures. Peak timing will be toward the end of the evening commute, with temperatures then dipping into the 20s following the snow.

CMiller

LONG TERM

Issued 301 PM CDT Sun Apr 5 2026

Tuesday through Sunday:

Warm advection will drive another area of rain/snow over central Wisconsin Tuesday night into Wednesday. Current NBM PoPs range from 40 to 60%, with the highest PoPs in that range over central WI. Rain may then continue north and west of Madison through the day, with some thunderstorms becoming possible Wednesday afternoon. With the surface warm advection, temperatures are expected to rise into the low 60s. A cold front will then pass Wednesday night, pushing rain east through the area.

Rain chances then linger Thursday through Sunday as the cold front then stalls over the eastern Corn Belt. While we'll technically be on the cold side of this stationary boundary, temperatures will stay mild in the mid 50s to low 60s.

CMiller

AVIATION

Issued 233 PM CDT Sun Apr 5 2026

Clouds increase tonight and decrease to MVFR as a front moves through. Expect rain showers, with some very isolated potential for snow to mix in over central to east central WI. MVFR cloud cover will then linger into the first half of Monday, with clouds then raising to VFR heights during the early afternoon. Tomorrow late afternoon and evening, convective snow showers look possible over eastern WI, which may cause brief dips in visibility and slushy light accumulations, provided warm pavement temperatures don't melt the snow on contact.

Winds will remain northerly to northwesterly and moderate tonight into tomorrow.

CMiller

MARINE

Issued 253 PM CDT Sun Apr 5 2026

Low pressure will drag a cold front over the lake tonight, with winds becoming breezy and northwesterly into tomorrow. While not widespread, a few gales may occur over the northern end of the lake. Winds then taper on Tuesday as high pressure settles into the Upper Great Lakes region.

Winds then quickly come around to southerly for Wednesday as another low approaches, with southerly Gales looking possible Wednesday afternoon into Thursday morning.

CMiller

MKX WATCHES/WARNINGS/ADVISORIES

WI...None. LM...Small Craft Advisory...LMZ643-LMZ644-LMZ645-LMZ646 until 4 PM Sunday.

Small Craft Advisory...LMZ643-LMZ644-LMZ645-LMZ646...4 PM Monday to 7 AM Tuesday.