West Allis, Wisconsin 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

936
FXUS63 KMKX 101450
AFDMKX

Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
950 AM CDT Tue Jun 10 2025

.KEY MESSAGES...

- Temperatures climb into the 70s today, then into the 80s
  Wednesday, with mostly dry weather.

- Occasional shower and thunderstorm chances return for the
  second half of the week (Wednesday evening and onwards).

&&

.UPDATE...
Issued 950 AM CDT Tue Jun 10 2025

Highs largely expected to be in the 70s today with modest winds.
Weak high pressure overhead today with clouds across central
parts of WI gradually clearing into the afternoon. Weak ridging
overhead will help keep the region dry through tonight. Into
Wednesday mostly zonal flow aloft will allow for some shortwave
activity to slide in off the weak ridging to the west into the
region. The low to mid level moisture will be fairly poor with
perhaps a shower or two but likely remaining dry through at
least the morning and likely through most of the afternoon as
well. Into the evening better moisture in the midlevels fills in
with shortwave activity continuing through the region and
likely bringing a period of showers/storms Wednesday evening and
overnight focused along the warm front. Instability looks
likely to be fairly limited to the southern parts of the CWA
when this comes through in large part due to timing but with
decent deep layer shear we cannot rule out a stronger storm or
two.

Kuroski

&&

.SHORT TERM...
Issued 326 AM CDT Tue Jun 10 2025

Today through Wednesday:

Dry weather is expected today through mid day Wednesday. The low
pressure system that brought us rain the previous two days will
slowly pull northeast and linger across Ontario through mid
this week. As it gradually moves away from the state, an upper
level ridge will build in and sfc high pressure in the Rockies
will move into the Ohio River Valley.

Winds will be light to moderate with some breezy conditions
(especially in the afternoons with help from diurnal mixing) as
southern Wisconsin sits between these two systems. Breezy
southwest winds will usher in some warmer conditions with todays
highs expected to climb into the mid to upper 70s. Due to the
breezy west winds, lakeshore areas are expected to be just as
warm as inland areas. WAA will continue into Wednesday as
dewpoints and temperatures climb ahead of an approaching cold
front. Highs Wednesday are expected to be in the upper 70s to
mid 80s. Winds may be slightly strong Wednesday as a low level
jet sets up across the state. Good low level forcing and WAA
could lead to some light showers developing Wednesday morning,
but chances are very low around 10%. The best chances will be
across west central Wisconsin where the LLJ is expected to be
stronger. Better chances for rain return Wednesday evening into
Wednesday night as a cold front and upper level shortwave moves
into the state.

Patterson

&&

.LONG TERM...
Issued 326 AM CDT Tue Jun 10 2025

Wednesday night through Sunday:

A potent little mid level shortwave trough is expected to roll
across the Plains, probably along the MN/IA border late Wednesday
afternoon and into southern WI Wednesday evening. There has been a
consistent signal for this feature over the past two days of
model runs. It looks like a convective complex should develop over
northern IA and track eastward into our area. The storm intensity
and track are still uncertain, since there is not a lot of deep
synoptic forcing driving this system. If we can get a lot of
sunshine Wednesday and if the higher dewpoints creep into southern
WI, then our environment will be primed with instability for any
established storms to remain intact as they roll through.

The baroclinic zone should stall over southern WI late Wed night
into Thu morning, and forecast easterly winds at the surface
suggest that we should be cloudy and cooler during the day
Thursday, although it may feel humid.

The low level jet will kick in over southern MN Thursday evening
and trigger storms in that area. That complex should lift through
northern WI and should miss us, although the ECMWF wants to keep
it closer to us. Unrelated, a shortwave trough sitting over the
central U.S. is expected to lift into IL Friday afternoon, so this
weak vorticity advection may bring some scattered showers and
thunderstorms to southern WI Friday afternoon. Overall, the
pattern is unsettled for the latter half of this week and through
early next week, but no all- day rain or significant severe
storms are anticipated. Right now it is looking like the "ring of
fire" should set up over the SD/MN over the weekend and through
the first half of next week, so the majority of storms would
remain to our west or be weakening as they reach us.

Cronce

&&

.AVIATION...
Issued 950 AM CDT Tue Jun 10 2025

Some MVFR CIGS will impact central WI this morning and perhaps
lingering into the afternoon but will otherwise remain VFR
through the TAF period. There will likely be some MVFR CIGS and
VSBYS Wednesday night into Thursday as a warm front settles over
the region bringing showers and storms to parts of southern and
central WI. Otherwise Wednesday may feature breezy southwest
winds for period later tonight through Wednesday morning.

Kuroski

&&

.MARINE...
Issued 326 AM CDT Tue Jun 10 2025

A broad area of high pressure will remain to our north in Ontario
through Thursday. Meanwhile high pressure in the Rockies will move
east into the Ohio River Valley Wednesday before continuing
east into the Mid Atlantic States for early Thursday. Light to
moderate south to southwest winds are expected across the lake
during this time. As diurnal mixing increases today and
Wednesday, winds will approach small craft criteria for the
nearshore zones. Gusts should remain just below small craft
criteria both days. Waves will remain low due to the off shore
winds.

Heading into Wednesday evening, a cold front will drop south
down the lake and become stationary across the far southern end
Thursday. This frontal boundary will remain draped across the
far southern lake until Friday, when a low pressure system moves
into central Wisconsin from the Rockies. Multiple rounds of
showers and thunderstorms will be possible Wednesday evening
through Friday.

Winds will remain light as the cold front moves through with areas
north of the boundary having northeast winds and areas to the south
having southeast winds. When the front stalls there will be a
lengthy period of time with onshore winds. While winds remain
light, waves will slowly build into the weekend. A Small Craft
Advisory may be needed for the end of the week.

Patterson

&&

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

$$

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