textproduct: Milwaukee/Sullivan

KEY MESSAGES

- 20-30 percent chances for light showers tonight and again on Saturday as a couple weak cold fronts move through srn WI. - Below normal temperatures return for Sunday and Monday with additional Frost Advisories possible over portions of srn WI. - A clipper system brings high rain chances (80 percent) for Tuesday. A few thunderstorms will be possible but no severe storms are anticipated at this time.

SHORT TERM

Issued 137 PM CDT Fri May 8 2026

This afternoon through Monday:

A mild and dry air mass resides over srn WI this afternoon via swly winds ahead of a weak wave of low pressure that will track across Lake Superior tnt. A vorticity maximum over central MN will track across central WI this evening in conjunction with continued low to mid level warm advection over srn WI. A weak cold frontal passage will then follow late tnt. Some of the fcst soundings briefly attempt to saturate the mid levels at times along with some light QPF on the CAMs and deterministic models. Will forecast 20 percent chances for a brief shower tnt.

On Saturday, another but slightly stronger shortwave trough passage is expected within nwly flow aloft. 850 mb frontogenesis is highlighted a bit on the models over sw WI and another cold frontal passage does occur. Given still, a fairly dry air mass, will keep rain chances at 20-40 percent. Nwly sfc winds and cold advection will bring a return of below normal temps for Sun-Mon. The passage of another shortwave trough on Sunday may eventually result in small shower chances given marginal instability that is expected. High pressure will then follow on Mon. Additional Frost Advisories may be needed for portions of srn WI during this brief cool period.

Gehring

LONG TERM

Issued 137 PM CDT Fri May 8 2026

Monday night through Friday:

A fairly strong shortwave trough and associated wave of low pressure, within nwly flow aloft, will then track across WI on Tue. A well organized swly low level jet and warm, moist advection pattern will bring sufficient moisture and lift for widespread rain and perhaps scattered elevated convection.

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 137 PM CDT Fri May 8 2026

VFR conditions from this afternoon through Saturday afternoon. Few-sct080-100 clouds will becoming broken tonight and Saturday with the passage of a couple cold fronts. Isolated to scattered light showers will be possible during this time along with Cigs of bkn040-060.

Gehring

MARINE

Issued 137 PM CDT Fri May 8 2026

Low pressure around 29.6 inches along the Minnesota and Canadian border this afternoon will move across Lake Superior tonight. Its cold front will move across Lake Michigan Saturday morning. Modest to breezy south winds will develop this afternoon before shifting southwest late tonight, and west on Saturday with the cold frontal passage. Another cold front will then shift the winds to northerly Saturday night. High pressure around 30.3 inches is then expected to move from southern Manitoba on Sunday to over Lake Michigan by Monday afternoon. Relatively light and variable winds are expected early next week.

Gehring

MKX WATCHES/WARNINGS/ADVISORIES

WI...None. LM...None.