Area Forecast Discussion
Issued by NWS Milwaukee/Sullivan, WI

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FXUS63 KMKX 182104

Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
335 PM CDT SUN SEP 18 2016


TONIGHT AND MONDAY...Forecast Confidence...Medium

Quiet weather is expected through most of the night as high pressure
continues to pull away ahead of an approaching trough. Could see a
few showers far northwest toward morning as moisture/instability
begins to increase.

Kept some low pops going Monday morning into the afternoon due to
increasing moisture and warm advection aloft. Soundings showing a
bit of a cap which may keep it mainly dry until late afternoon when
the cap weakens. Thus have highest pops late in the afternoon.

Above normal temperatures will continue tonight and Monday.

Monday night through Thursday...Forecast confidence medium.

The cold front is expected to initiate scattered to numerous
thunderstorms by late Mon afternoon or early evening from nw IL
into se WI. MLCAPE values will be around 1000 J/kg while deep
layer shear of 40-45 kts will be present. Some modest low level
wind shear as well. Thus some supercell storms will be possible
and SPC marginal risk is placed well over much of the CWA. The
cold front should move out of far se WI around 06z with dry air
and high pressure to follow for Tue.

A trough of low pressure and associated low to mid level warm
advection and frontogenesis will then develop newd from NE to nrn
WI from late Tue nt-Wed nt. A shortwave trough tracking from the
central Great Plains through WI will aid in the overall lift and movement
of the surface trough. Much of the lift, and showers and tstorms
will remain north and west of Madison until Wed night when the
shortwave trough tracks across the state. Thus higher confidence
for showers and storms will be Wed night, possibly lingering into
Thu morning.

.LONG TERM...Friday through Sunday...Forecast confidence medium.

A front will then stall in the vicinity of srn WI into the weekend
with ridging aloft ahead of a sharp upper trough and associated
cold front moving east across the Great Plains. Thus tstorm
chances will continue with above normal temps and humidity.



VFR conditions will continue through at least the evening. The NAM
is hinting at some lower clouds in the west later tonight into
Monday morning as a weak trough approaches, but still leaning toward
keeping the forecast VFR through Monday.

There will be a chance for showers/storms late tonight and Monday as
the wave moves through, with the best chance coming late afternoon
into the evening.

A period of low level wind shear tonight still looks possible per
the 12Z NAM, mainly across the northwest half of the forecast



Southwest winds will be gusty tomorrow ahead of an approaching wave.
Decided to issue a Small Craft Advisory based from mid-morning
through late afternoon.


.MKX Watches/Warnings/Advisories...
LM...SMALL CRAFT ADVISORY from 10 AM CDT Monday until 6 PM CDT
Monday for LMZ643-646.


Monday NIGHT THROUGH Sunday...Gehring is the U.S. government's official web portal to all federal, state and local government web resources and services.