NWS-Milwaukee/Sullivan Forecast Discussion

						FXUS63 KMKX 081837
AFDMKX

Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
137 PM CDT Fri May 8 2026

.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.
&&

$$

Visit us at weather.gov/milwaukee

Follow us on Facebook, X, and YouTube at:
www.facebook.com/NWSMilwaukee
www.x.com/NWSMilwaukee
www.youtube.com/NWSMilwaukee