Area Forecast Discussion
Issued by NWS Chicago, IL

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069
FXUS63 KLOT 290731
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
231 AM CDT Sat Jul 29 2017

.SHORT TERM...
231 AM CDT

Through tonight...

Weather nil through tonight. Mostly sunny skies, comfortable
humidity, and a breeze off the lake keeping temps a couple degrees
cooler near Lake Michigan. Clear and comfortable tonight.

- Izzi

&&

.LONG TERM...
231 AM CDT

Sunday through Friday...

Tranquil weather expected through majority of the period. A
very gradual warming trend is expected through midweek with
dewpoints gradually creeping up as well. Now seeing some
differences between the GFS and ECMWF wrt the timing of the
midweek trough and transition back to cooler and less humid air.
ECMWF is slower than previous runs and now focuses better precip
chances more Thursday while GFS is favoring Wednesday/Wednesday
night. Confidence is low at this point, so didn`t make any changes
to the blended model solution which features several periods of
low pops. As models begin to key in on timing, then precip chances
will likely need to be increased. Transition to modestly below
average temps, very comfortable humidity looks to be in the offing
for next weekend.

- Izzi

&&

.AVIATION...
For the 06Z TAFs...

High pressure centered over northern Wisconsin overnight will
settle south over southern Wisconsin over the next 24 hours.
Persistence will prevail with VFR conditions and modest north to
northeast winds throughout the period.

BMD

&&

.MARINE...
329 PM CDT

High pressure to the north will continue to build south across
the region throughout the weekend, with northerly winds persisting
through this period. In the near term, tighter gradient in place
across the south half is allowing for the strongest wind speeds to
be occurring over this area this afternoon. This will likely
continue for most of tonight, with some slight diminishing trend
possible. Also, in the near term, not out of the question for
occasional gusts to 30 kt to occur over the south half and
nearshore waters this evening. These elevated winds and resultant
higher waves are providing hazardous conditions for small craft
this afternoon, and will continue tonight into Saturday morning. A
diminishing trend is likely across the entire lake Saturday into
Saturday night, with waves diminishing during this time. Will
continue to monitor possibly extending the small craft advisory
slightly longer on Saturday, to account for possible higher waves
still in place.

Rodriguez

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Beach Hazards Statement...ILZ006-ILZ014 until 7 PM Saturday.

IN...Beach Hazards Statement...INZ001-INZ002 until 7 PM Saturday.

LM...Small Craft Advisory...nearshore waters
     until 10 AM Saturday.

&&

$$

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