Weather Update for Chicago Area Monday, November 6, 2017


 National Weather Serviceweek of the Nov6

Today will be cloudy and windy with a high near 45 and winds from 10 mph gusting to 20 mph. Tonight mostly cloudy with winds 5-10 mph with a high of 39. Tuesday mostly cloudy, with a high near 45. Northeast wind around 10 mph. Tuesday Night partly cloudy, with a low around 32. North wind 5 to 10 mph. Wednesday sunny, with a high near 43. North northwest wind around 5 mph becoming west southwest in the afternoon. Wednesday Night mostly clear, with a low around 32. Thursday mostly sunny, with a high near 42. Thursday Night partly cloudy, with a low around 26. Friday
partly sunny, with a high near 37. Friday Night mostly cloudy, with a low around 31.
Veterans Day a chance of rain and snow showers. Mostly cloudy, with a high near 41.
Saturday Night a chance of rain and snow showers. Mostly cloudy, with a low around 35. Sunday a chance of rain and snow showers. Partly sunny, with a high near 42.

Mostly Cloudy 38°F 3°C

Humidity 76%
Wind Speed NW 8 mph
Barometer 30.13 in (1020.7 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill 32°F (0°C)
Last update 6 Nov 3:53 am CST

Quiet and cooler weather is in store today and tonight, with
variable though increasing clouds after a partly cloudy start to
the day for some areas. Expansive high pressure near the
Minnesota/Dakotas border will spread southeast. Fast westerly mid-
level flow will spread solid level deck of clouds over central
and western Iowa over the area and there may be some lower clouds
spreading in from the lake for areas closer to the lake. High
temperatures are a bit tricky due to the cloud cover and any gaps
in it, with generally lower to mid 40s favored and upper 40s
possible in the eastern and southeast CWA, with upper 40s possibly
more widespread as far west as Chicago if there`s sufficient
breaks in the clouds.

The main uncertainty tonight is the extent of cloud cover and then
any breaks in the clouds overnight and the impact on low
temperatures. MAV/MET MOS guidance indicates that if clouds
dissipate enough, then with light winds under high pressure, lows
in the 20s could be more widespread over interior northern
Illinois. Current forecast favors upper 20s to around 30 far
north, with 30s elsewhere.

Tuesday through Sunday…

The main concern is the generally chilly temperatures through the
work week, with downright cold air becoming increasingly likely to
close the week. Models are coming into better agreement on an
impressive for early to mid November shot of Arctic air arriving
on Thursday and continuing through Friday.

Prior to that, the quiet weather will continue, with high pressure
over the northern Plains strengthening to about 1035 mb and a
sheared trough axis both spreading southeastward. Cannot rule out
a few sprinkles on Tuesday afternoon, but it will otherwise be
dry. Clearing skies Tuesday night should enable for the coolest
overnight lows of the season for many areas (including the first
freeze for much of Chicago except for possibly lakeside).
Expecting lower to mid 20s north of I-80 outside of Chicago, upper
20s to around 30 south and upper 20s to lower 30s in the city.
After a mostly sunny and cool Wednesday and another similarly
chilly night Wednesday night, the sharp Arctic front looks to
arrive Thursday, with some uncertainty on timing.

When the front arrives, temperatures will likely quickly fall the
rest of Thursday, with overnight lows in the upper teens to 20s
(possibly colder per some of the latest guidance) early Friday
morning and highs struggling to the mid to upper 30s on Friday.
This will get the lake effect machine going to our east at first,
and can`t rule out some snow showers Friday morning as flow turns
north to northeast. Models then continue to indicate the potential
for unsettled weather next weekend, which could start out as snow
Friday night into Saturday if it is precipitating.


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