Madison, Wisconsin 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

634
FXUS63 KMKX 271943
AFDMKX

Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
243 PM CDT Fri Jun 27 2025

.KEY MESSAGES...

- Heat index vales in the 95 to 100 degree range on Sunday.

- Thunderstorms are expected Sunday afternoon and evening, along
  and ahead of a cold front. Gusty winds are possible with the
  strongest storms.

- Turning somewhat cooler and less humid through mid week, with
  a more active pattern returning toward the end of the week.

&&

.SHORT TERM...
Issued 242 PM CDT Fri Jun 27 2025

Tonight and Tomorrow:

Stratocu should dissipate fairly quickly this evening as the sun
begins to set, as high pressure and associated drier air build
into the region. Lows are expected to fall into the upper 50s to
low 60s. With clearing skies and the approach of the high, fog
is a concern given the recent rainfall. Dense fog potential is
greatest west of I-39, though a few low lying areas farther
east could see some ground fog by sunrise on Saturday.

High pressure will push east of the area tomorrow, with
temperatures warming as southerly flow redevelops over the
region. Highs will range from the low 80s east to mid to upper
80s over the western and southwestern forecast area. Dewpoints
will also begin to climb again by afternoon.

Boxell

&&

.LONG TERM...
Issued 242 PM CDT Fri Jun 27 2025

Tomorrow Night through Friday:

Thunderstorms will develop across northern Wisconsin tomorrow
night along a frontal boundary and/or remnant outflow from
convection that is expected tonight over the Dakotas. This
activity should mainly remain to our north, but may approach
central Wisconsin Sunday morning before dissipating.

The daytime hours on Sunday are expected to be very hot and
humid, with highs around 90. Dewpoints in the low 70s will
support heat indices around 100, though right now it looks like
most locations will remain just below Advisory levels.

Thunderstorm chances increase late Sunday afternoon and Sunday
evening. Initial development may be ahead of the cold front,
perhaps in association with outflow from the Saturday night
convection combined with an approaching MCV from the northwest.
Shear will be relatively weak, but an unstable airmass will
support strong/severe wind gusts with the strongest storms.

An initial weak front will pass through Monday, followed by a
stronger cold front Monday night or early Tuesday. High pressure
will bring more typical highs (low to mid 80s) to the region
through mid week, along with somewhat more comfortable humidity
levels. A building ridge to our west then suggests a return to a
warmer and more active pattern toward the end of the week.

Boxell

&&

.AVIATION...
Issued 242 PM CDT Fri Jun 27 2025

A mix of MVFR and VFR stratocu will dissipate this evening. Fog
is expected in some spots by morning, with greater chances
further to the west. Any fog that develops will dissipate within
a few hours of sunrise, with VFR conditions expected during the
day on Saturday.

Winds will become light and variable tonight, then become light
from the south by Saturday afternoon.

Boxell

&&

.MARINE...
Issued 242 PM CDT Fri Jun 27 2025

Low pressure around 29.7 inches over Lake Huron will push into
Quebec tonight. Winds will turn west late this afternoon and this
evening as a front moves across the lake.

Weak high pressure around 30.1 inches will move into the region
later tonight into Saturday, which will allow winds to weaken.
Winds will become south and increase Saturday night into Sunday,
as the high moves east of the region. Winds then shift west by
early next week.

Boxell

&&

.MKX WATCHES/WARNINGS/ADVISORIES...
WI...None.
LM...None.
&&

$$

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