A snow depth forecast of 3.7″ WAS the early morning forecast for Arlington Heights and nearby communities Monday February 5, 2018. However, this snow system so far appears to have less punch than forecast. Light snow and flurries began about 2:30 p.m., NOT 12 PM as was the initial forecast start time. Snow accumulation which was expected to be 2.1″ by 6 PM is only 0.6″. Also, deeper snow accumulations appear to be far south, instead of far west as was initially forecast.
Areas of heavier snow developing this afternoon. Vis less than 1/2 mile and inch per hour rates likely in these areas. #ILWX #INWX pic.twitter.com/5qqDKd2tWA
— NWS Chicago (@NWSChicago) February 5, 2018
Winds will be 6-8 MPH shifting gradually from the southwest to the northwest by 4:00 a.m.
The air temperature forecast was botched today. A high temperature of 17°F DID NOT hold from 2 PM to 9 PM Monday. Instead air temperature held at about 11-12°F.
Air temperature was expected to fall to 15°F to 14°F by 11 PM Monday when the snow ends, but now it is expected to rise to 16°F from 9:00 p.m. to 10:00 p.m. Air temperature was rising from 10°F at 6:00 p.m.
The snow-to-liquid ratio is expected to be dry at 16-17:1, and possibly as high has 25:1 (very dry fluffy snow).
DIY shovelers who wait until Tuesday morning after dawn will face 7°F air temperatures and a -5°F wind chill with NW winds 6 MPH from 5:00 AM to 7:00 AM. Sunrise Tuesday morning is 6:59 a.m.
Another 1.8″ of snow are expected to fall between 6PM Tuesday night and 6AM Wednesday morning.
Snow will overspread nrn IL & NW IN early to mid afternoon and continue through late eve. Snow will be moderate to heavy at times with half pic.twitter.com/vEVLlEUf0D
— NWS Chicago (@NWSChicago) February 5, 2018
Deeper snow is forecast for the southwest suburbs and far west suburbs, including Aurora, Joliet, Naperville. The close edge of deeper snow if expected along a line from Joliet to Rockford, and Joliet to Pontiac, and then west to the Mississippi River.
FORECAST
Tonight: Snow, mainly before 10pm. Low around 6. Wind chill values as low as -3. South southwest wind around 5 mph becoming northwest after midnight. Chance of precipitation is 100%. Total nighttime snow accumulation of 1 to 2 inches possible.
Tuesday: Increasing clouds, with a high near 19. Wind chill values as low as -5. Northwest wind around 5 mph becoming northeast in the afternoon.
Tuesday Night: Snow, mainly after midnight. Low around 13. East northeast wind around 5 mph becoming north northwest after midnight. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Wednesday: A 30 percent chance of snow before noon. Mostly cloudy, with a high near 23. North northwest wind 5 to 10 mph.
Wednesday Night: Mostly cloudy, with a low around 6. West wind around 5 mph.
Thursday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 24.
Thursday Night: Snow likely. Cloudy, with a low around 16. Chance of precipitation is 70%.
Winter Weather Advisory
URGENT – WINTER WEATHER MESSAGE
National Weather Service Chicago IL
237 PM CST Mon Feb 5 2018
…Accumulating snow through this evening with hazardous travel
during the evening commute likely…
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-
Including the cities of Rockford, Belvidere, Woodstock, Waukegan,
Oregon, Dixon, DeKalb, Aurora, Elgin, Wheaton, Chicago, Ottawa,
Oswego, Morris, and Joliet
237 PM CST Mon Feb 5 2018
…WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST
TONIGHT…
* WHAT…Snow occurring, heavy at times. Plan on slippery road
conditions, including during the evening commute. Additional
snow accumulations of 3 to 5 inches are expected.
* WHERE…Portions of north central and northeast Illinois.
* WHEN…Until midnight CST tonight.
* ADDITIONAL DETAILS…Be prepared for sharply reduced
visibilities at times and a much longer evening commute.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving.
february.chicagoweatherstation.com
Chicago Weather Forecast for your MAC/PC/TABLET includes surrounding suburbs.
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#Snowstorms are rolling into the Midwest bringing 1-3", but #Chicago and #DesMoines could see a band of 3-5". It's quick-hitting so we're keeping an eye on travel conditions in the area. AMHQ has the latest from now until 9aET. pic.twitter.com/l7WHy4GUHj
— AMHQ (@AMHQ) February 5, 2018