Area Forecast Discussion
Issued by NWS Chicago, IL

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FXUS63 KLOT 241933
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
233 PM CDT Tue Apr 24 2018

.SHORT TERM...
200 PM CDT

Through Wednesday...

Low pressure across the Ohio and Tennessee valleys will finally
pull away from the region tonight. Lower clouds and maybe an
isolated shower will found along and east of I-55. On the heels
of this departing low, a cold front will move through tonight
ahead of a northern stream shortwave that is presently shifting
through the upper Midwest and upper Great Lakes. High pressure in
wake of this wave will enable gusty northeast winds to usher in a
cooler airmass beginning late this evening and begin our modest
temperature roller coaster ride that will continue for a few days.

Therefore, after some warm or at least seasonably warm days,
temperatures will take a dip on Wednesday following the passage of
the cold front. Brisk northeast winds will hold readings some 10
degrees colder in spots, with lower 60s south and west, and
readings in the 50s as you head closer to the lake. The warm April
sun should help to make it feel a bit warmer.

KMD

&&

.LONG TERM...
230 PM CDT

Wednesday night through Tuesday...

Overview...Looking at a pretty quiet extended with an early taste of
summer possible early next week.

High pressure will dominate the pattern Wednesday night through
Thursday evening. Seasonal temps and dry conditions are expected. A
lake breeze is possible Thursday afternoon, possibly leading to
cooler temps along the lake.

An upper level wave and cold front move across the region Thursday
night/Friday. Could see a ribbon of rain shift southeast across
the forecast area. Winds become northerly behind the front and
cooler air will lead to highs in the 50s to around 60 Friday.
Highs will be around 50 along the lake.

A large ridge builds over the CONUS over the weekend, and looking at
above normal temperatures early next week. 70s and maybe even 80s
are possible. High temps Monday and Tuesday could be warmer than
currently forecast, but I`d rather stick with the blend`s high temps
this far out. Guidance hints that clouds and perhaps showers and
storms could limit temps Tuesday.

JEE

&&

.AVIATION...
For the 18Z TAFs...

ENE winds will continue through the afternoon, holding
in the 8-11 kt range. MVFR ceilings continue to erode from the
northwest this afternoon, though expect these clouds to linger
southeast of the terminals even into the evening hours across
east central IL and northwest IN. Any isolated showers would be in
this corridor. VFR clouds will linger across the Chicago
terminals.

A cold front will usher in gusty N to NNE winds beginning mid-
evening. There may even be some expansion of the MVFR cigs farther
westward but at this point it appears any lower clouds would be
scattered. After gusty N to NNE winds tonight (to 25 kt or so),
expect continued NE winds in excess of 10 kt through the day on
Wednesday.

KMD

&&

.MARINE...
230 PM CDT

A cold front will move down Lake Michigan this evening and overnight
with northerly flow strengthening in its wake. Wind gusts are
expected to peak around 30 kt late this evening and overnight, then
should very gradually diminish through the day Wednesday as a ridge
of high pressure spreads across the region. A small craft advisory
remains for the Illinois and Indiana nearshore waters for this
evening through Wednesday evening. Winds flip to southwest behind
the ridge axis on Thursday and ahead of another approaching cold
front. This next front is expected to sweep across the Lake Thursday
night possibly bringing another period of north winds gusting to
around 30 kt.

BMD/JEE

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory...LMZ740-LMZ741-LMZ742...10 PM Tuesday to
     10 PM Wednesday.

     Small Craft Advisory...LMZ743-LMZ744-LMZ745...1 AM Wednesday to
     1 AM Thursday.

&&

$$

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