textproduct: Milwaukee/Sullivan

KEY MESSAGES

- A mild and breezy afternoon giving way to another cool period and some frost at night through Monday. A Frost Advisory may be needed Sunday night/early Monday morning over portions of southern WI.

- A clipper system brings high shower chances (80 percent) for Tuesday. A few thunderstorms will be possible, but no severe storms are anticipated at this time.

SHORT TERM

Issued 130 PM CDT Sat May 9 2026

This afternoon through Monday:

Another mild and breezy afternoon with high based cumulus clouds is occurring. The breezy nwly winds are associated with the passage of a cold front which will mark the beginning of a cool period lasting into Monday. Lighter nly winds and cold advection will continue tnt, including areas of frost well inland from the lake. Temps are not quite cool enough for an advisory at this time.

A shortwave trough within nwly flow aloft will then bring another round of high based cumulus clouds and scattered sprinkles for Sunday afternoon. High temps will range from 55-60F across srn WI. High pressure moving into nrn MN will then reach srn WI by Mon AM with low temps once again in the 30s. A Frost Advisory will likely be needed for portions of srn WI Sun nt/Mon AM. The high pressure area will gradually shift ewd on Mon with lgt sly winds not developing until late in the day. High temps will range from the upper 40s at the Lake MI shoreline to around 60F over south central WI.

Gehring

LONG TERM

Issued 130 PM CDT Sat May 9 2026

Monday night through Saturday:

Models continue to support a fairly strong shortwave trough and associated wave of low pressure tracking from Canada to central WI on Tue. A well organized swly low level jet of 45-50 kt and warm, moist advection pattern will bring sufficient moisture and lift for widespread rain and perhaps scattered elevated convection. There will be just low chances for sfc based convection with the cold frontal passage late Tue afternoon and evening.

High pressure will then follow for Wed nt-Thu AM followed by a jet stream pattern change to quasi-zonal for late next week. This will bring a return of warm and humid conditions and increasing rain chances.

Gehring

AVIATION

Issued 130 PM CDT Sat May 9 2026

VFR conditions will prevail from this afternoon into Sunday night. Sct-bkn050-070 cumulus this afternoon then developing again for Sunday afternoon. Gusty nwly wind gusts to 30 kts this afternoon.

Gehring

MARINE

Issued 130 PM CDT Sat May 9 2026

Low pressure around 29.5 inches east of Lake Superior this afternoon will move into southern Quebec tonight. Its trailing cold front will continue to move across Lake Michigan this afternoon. Westerly winds ahead of the front will veer northwest with the frontal passage. Gusty northwest winds are expected near the western shoreline this afternoon. A backdoor cold front will then sag southward across the lake this evening through tonight, with a period of north to northeast winds behind it.

High pressure around 30.3 inches is then expected to move from southern Manitoba on Sunday to over Lake Michigan by Monday morning. Relatively light and variable winds are expected during this period. Low pressure around 29.7 inches should then move east southeast across the region Tuesday, with increasing south to southeast winds ahead of it, veering west to northwest behind it for Tuesday night into Wednesday.

Gehring

MKX WATCHES/WARNINGS/ADVISORIES

WI...None. LM...Small Craft Advisory...LMZ643-LMZ644-LMZ645-LMZ646 until 7 PM Saturday.