Beloit, Wisconsin Weather Forecast Discussion

720
FXUS63 KMKX 270903
AFDMKX
Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
403 AM CDT Sat Sep 27 2025
.KEY MESSAGES...
- Areas of dense fog early this morning quickly burning off then
  becoming very warm with high temperatures in the 80s.
- Above normal temps and dry weather expected through the
  weekend and into next week.
&&
.SHORT TERM...
Issued 403 AM CDT Sat Sep 27 2025
Today through Sunday:
Have issued a Dense Fog Advisory until 8 AM CDT for several
counties along the I-94 corridor and southward. The fog may
dissipate beforehand as wly 925 mb winds increase to 20-30 kts
as the sfc trough over ern MN moves into nwrn WI and se MN by
12Z. The stationary front near the IL border and far ne IA will
quickly develop newd across srn WI this morning with swly sfc
winds becoming established. The warm advection and sunshine will
boost temperatures into the lower to middle 80s for the
afternoon. The sfc trough will quickly move across the nrn Great
Lakes today with the trailing cold front moving into locations
nw of Madison by late afternoon then moving across the remainder
of srn WI this evening. A dry frontal passage is expected as the
airmass is too dry.
Upper ridging will quickly follow along with sfc high pressure
moving into central WI by 12Z Sunday. Cold advection then
radiational cooling will drop temps into the 40s north and west
of Madison by sunrise with 50s over the remainder of the area.
The high will then expand ewd across the Great Lakes on Sunday
with light ely winds across srn WI. A pleasant day in the 70s is
forecast.
Gehring
&&
.LONG TERM...
Issued 403 AM CDT Sat Sep 27 2025
Sunday night through Friday:
Ridging in the polar jet looks to remain prevalent over our region
through the entire LONG TERM forecast period, favoring dry and
quiet weather. GEFS QPF plumes indicate that the soonest we could
see the ridge break down and mentionable rain chances re-enter
the forecast is around next weekend, and even then, it`s not a
particularly strong signal. As such, we have < 10% precip chances
thru the week unless things change.
This same pattern favors above normal temperatures through the
period, with predominantly light east winds keeping lakeshore
areas cooler (in some cases, 3 to 7 degrees cooler than the values
I`ll discuss below). Daytime highs around the low 80s for inland
areas early in the week, with a lull in the heat possible mid week
and onwards as strong high pressure over southern Canada
continues the easterly winds. We currently have mid to upper 70s
in the forecast to account for this, which is still 10 degrees
above seasonal norms (upper 60s). Lower quartiles for high
temperatures (using GEFS) are closer to 70 degrees mid week, which
would still be 3 degrees above normal. On the bright side,
dewpoints look to remain in the 50s for much of the period, with
around 60 dews for daytime hours early in the week, drying out
closer to 50 degrees on average thru the rest of the week. In
other words, not too much humidity.
Sheppard
&&
.AVIATION...
Issued 403 AM CDT Sat Sep 27 2025
Areas of dense fog and low stratus will continue through
sunrise from just west and south of Milwaukee and over much of
south central WI. Smaller pockets of fog and low stratus toward
east central WI through sunrise. The fog and stratus will
quickly burn off after 13Z with VFR conditions expected the
remainder of the day and through Saturday night.
Gehring
&&
.MARINE...
Issued 403 AM CDT Sat Sep 27 2025
Modest southerly winds will develop this afternoon ahead of an
approaching cold front from the west. The dry cold front will pass
this evening from north to south across the lake with winds
shifting to northerly. Another high pressure around 30.2 inches
quickly builds in behind this frontal passage for Sunday with
light and variable winds over the lake. The high will expand
across the Great Lakes and linger into early next week. Light
winds are expected.
Gehring
&&
.MKX WATCHES/WARNINGS/ADVISORIES...
WI...Dense Fog Advisory...WIZ062-WIZ063-WIZ064-WIZ065-WIZ068-WIZ069-
     WIZ070 until 8 AM Saturday.
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

NWS MKX Office Area Forecast Discussion