Area Forecast Discussion
Issued by NWS Chicago, IL

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
FXUS63 KLOT 191951

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
151 PM CST Sun Nov 19 2017

150 PM CST

Through Monday...

High pressure is centered over the southern Great Plains this
afternoon with ridging extending into the Upper Midwest. Ridge
axis will gradually traverse the CWA this evening and tonight with
winds backing to the southwest behind. Low/mid level WAA will
overspread the region after midnight tonight. Temperatures will
fall into the upper 20s outside the Chicago Metro late this
evening, then should hold steady through much of the overnight
hours, and may warm a degree or two in spots as WAA strengthens.
Expect highs right around 50F during the day Monday with mostly
sunny skies and breezy southwest winds on the backside of the
ridge which will settle across the Tennessee Valley.



121 AM CST

Monday through Saturday...

The general idea is high pressure will shift across
the Great Lakes, then shift off to the Ohio valley and mid
Atlantic regions with some regularity throughout the extended. A
series of clipper like systems will bring occasional wind, clouds
and cold spells, followed by warm ups as each high pressure
departs east. This will result in several up and down swings of
temperature. No one system is expected to bring any real
precipitation, even though occasionally Tuesday night, Wednesday
night, and toward Saturday a model will try to throw out some very
light QPF, so most of the week appears dry at this point. The
first front will lead to a little cooler day Tuesday, then a
repeat of today on Wednesday with highs only in the 30s, before
readings head back closer to normal Thanksgiving day and toward
week`s end before another colder shot next weekend, and maybe some
light precipitation mainly of the liquid form to accompany this



For the 18Z TAFs...

High pressure will build across the region today providing
primarily VFR conditions and a modest west to southwest breeze.
Late this morning through the afternoon, there will be few to
scattered stratocumulus around 030 but given the dry advection
into the region do not anticipate a broken deck to develop.
Otherwise just expect mid and high clouds to traverse the region.
Winds will be somewhat breezy during the day, with gusts to around
20kt. Winds will diminish this evening and back to the southwest
as the ridge axis moves through overnight. Winds will continue
out of the southwest Monday with gusts to around 20kt possible
once again from mid morning into the afternoon.




156 am...Northwest gales have ended and will be canceling the
gale warning early. Northwest winds to 30 kts will slowly turn
westerly this afternoon as high pressure moves south of Lake
Michigan. Speeds may diminish further to 15-25kts tonight...
especially on the north end of the lake. Winds will turn to the
southwest Monday and are expected to increase to gales Monday
afternoon as strong low pressure moves across Ontario Monday
night. These gales will diminish Tuesday morning and shift to the
northwest as a cold front moves across the region. High pressure
will build across the plains Tuesday and then to the southern
lakes and Ohio Valley Wednesday into Thursday with westerly winds
for mid week. cms


LM...Small Craft Advisory...IN nearshore waters until 9 AM Wednesday.

     Small Craft Advisory...LMZ740-LMZ741-LMZ742...noon Monday to 6
     PM Tuesday.

     Gale Watch...LMZ777-LMZ779...3 PM Monday to 3 PM Tuesday.




WWW.YOUTUBE.COM/NWSCHICAGO is the U.S. government's official web portal to all federal, state and local government web resources and services.