A good flow of moisture is associated with the upcoming storm that the Weather Channel has named Winter Storm Jacob. The worst conditions are forecast for Iowa, western Wisconsin, Minnesota, and the Dakotas. While Chicagoland and most of Illinois are under a Winter Weather Advisory, a Blizzard Warning is activated for the eastern Dakotas, southwest and far west Minnesota, and northwest Iowa. Eastern Minnesota, eastern Iowa and northwest Wisconsin are under a Winter Storm Warning.
Cardinal Weather confidence is medium that snowfall accumulation in Arlington Heights and nearby communities will be about 3.6 inches for the period from 4:00 p.m. Friday until 3:00 a.m. Saturday. Flurries may start about 3:00 p.m., but the most intense snow will fall between 5:00 p.m. and 3:00 a.m. Initial rain/snow mix or snow that doesn’t stick, and a warmup after 10:00 p.m. until about 10:00 a.m. Saturday are the reasons preventing high confidence for the snowfall accumulation amounts. A slushy mess on the ground will begin sometime around 3:00 a.m. Saturday as snow changes to all rain. Then watch out because a hard freeze will begin as temperature fall below 32°F by 2:00 p.m. Saturday and drop to 4°F by 5:00 a.m. Sunday.
Wind gusts (from southeast) Friday will peak at about 31 MPH from about 10 p.m. to midnight Friday/Saturday. Wind gusts (from west) Saturday will peak at about 43 MPH from 2:00 p.m. to 3:00 p.m.
Weather Radar (also nexrad.chgowx.com) shows precipitation encircling Chicagoland while it a large area of precipitation moves southwest to northeast. The precipitation is just about to edge into Kane, Kendall and Grundy counties at about 2:00 p.m.
Snow develops this afternoon, changes to a wintry mix with slippery travel tonight. Saturday will see some light rain/snow early, then very windy and much colder with gusty snow showers possible. Sunday will be dry but cold, with wind chills ranging from -10 to -20 early. pic.twitter.com/DKs3fOSEaa
— NWS Chicago (@NWSChicago) January 17, 2020
Coldest wx of winter so far will rush into the area Sat. aftn driven by strong west winds gusting up to 45 mph. Scattered snow showers or squalls psbl & even patchy blowing snow parts of N IL. As temps plummet, slick spots may develop. Wind chills -10 to -20° Sun. AM! #ilwx #inwx pic.twitter.com/moMBFxL4WA
— NWS Chicago (@NWSChicago) January 17, 2020
What's the latest on Winter Storm #Jacob? We've got all the info on how it will affect your area on our LIVE coverage. pic.twitter.com/mU8SEeaV1V
— The Weather Channel (@weatherchannel) January 17, 2020
O’HARE FORECAST …
This Afternoon: Snow, mainly after 3pm. High near 30. Southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. Total daytime snow accumulation of less than one inch possible.
Tonight: Snow, freezing rain, and sleet before 3am, then snow, possibly mixed with freezing rain between 3am and 4am, then rain after 4am. Temperature rising to around 34 by 5am. Breezy, with a southeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New ice accumulation of less than a 0.1 of an inch possible. New snow and sleet accumulation of 2 to 4 inches possible.
Saturday: Rain before noon, then a slight chance of rain and snow showers between noon and 2pm, then a slight chance of snow showers after 2pm. Temperature rising to near 38 by 10am, then falling to around 19 during the remainder of the day. Wind chill values as low as 1. Breezy, with a south wind 15 to 25 mph becoming west in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Saturday Night: Mostly cloudy, with a low around 4. Wind chill values as low as -17. Breezy, with a west wind 20 to 25 mph, with gusts as high as 40 mph.
Sunday: Partly sunny, with a high near 13. Blustery, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday Night: Mostly cloudy, with a low around 7.
M.L.King Day: Mostly sunny, with a high near 19.
Monday Night: Mostly clear, with a low around 6.
Tuesday: Sunny, with a high near 24.
Tuesday Night: Partly cloudy, with a low around 16.
Wednesday: Partly sunny, with a high near 35.
Wednesday Night: Mostly cloudy, with a low around 28.
Thursday: A slight chance of rain and snow. Mostly cloudy, with a high near 39.
LAKE TEMPS …
SOUTHERN LAKE MICHIGAN WATER TEMPERATURES
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
913 AM CST Fri Jan 17 2020
LAKE MICHIGAN WATER TEMPERATURES…
CHICAGO SHORE……….35
CHICAGO CRIB……….31
MICHIGAN CITY……….36
&&
M IS FOR MISSING DATA THAT IS NORMALLY AVAILABLE.
THE MICHIGAN CITY WATER TEMPERATURE SENSOR IS LOCATED AT A WATER
INTAKE ONE MILE OFFSHORE AND 60 FEET BELOW WATER SURFACE. IT IS READ EVERY DAY OF THE YEAR.
january.chicagoweatherstation.com
Chicago Weather Forecast for your MAC/PC/TABLET includes surrounding suburbs.
^^ MOBILE? USE VOICE MIC ^^
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Winter Weather Advisory
URGENT – WINTER WEATHER MESSAGE
National Weather Service Chicago IL
132 PM CST Fri Jan 17 2020
ILZ006-012>014-180600-
/O.EXT.KLOT.WW.Y.0004.200117T2200Z-200118T1200Z/
Lake IL-Kane-DuPage-Cook-
Including the cities of Waukegan, Buffalo Grove, North Chicago,
Highland Park, Mundelein, Gurnee, Round Lake Beach, Aurora,
Elgin, Naperville, Wheaton, Downers Grove, Elmhurst, Lombard,
Carol Stream, Addison, Chicago, Humboldt Park, Hyde Park,
Lakeview, Lincoln Park, Logan Square, and Navy Pier
132 PM CST Fri Jan 17 2020
…WINTER WEATHER ADVISORY NOW IN EFFECT FROM 4 PM CST THIS
AFTERNOON UNTIL 6 AM CST SATURDAY…
* WHAT…Mixed precipitation expected. Snow will begin late this
afternoon, as early as 4 pm for the far west suburbs, and
continue through this evening. Snowfall is expected to be
moderate to heavy at onset, with rates of one half to one inch
per hour. Nearly all of the snow will fall by midnight, with the
snow changing to sleet and freezing rain after midnight. Total
wet snow and sleet accumulations of 2 to 4 inches and ice
accumulations of up to one tenth of an inch possible.
* WHERE…Lake IL, Cook, Kane and DuPage Counties.
* WHEN…Until 6 AM CST Saturday.
* IMPACTS…Plan on slippery road conditions. The hazardous
conditions will impact the evening commute.
* ADDITIONAL DETAILS…A lull in precipitation is expected
Saturday morning before a strong cold front brings rapidly
falling temperatures, scattered snow showers, and strong
westerly winds gusts of 45 mph Saturday afternoon.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
Slow down and use caution while traveling.
The latest road conditions for Illinois can be obtained on the
internet at www.gettingaroundillinois.com.