FLOOD WATCH: 2″ Rain Expected in Arlington Heights, NW Suburbs from 8AM Monday – 11PM Tuesday

MODERATE TO HEAVY RAIN EVENT FORECAST TO BEGIN ABOUT 8AM MONDAY AND LAST UNTIL 11PM TUESDAY WITH ABOUT 2 INCHES OF RAINFALL EXPECTED IN ARLINGTON HEIGHTS AND NORTHWEST SUBURBS

A very strong low level jet (lower level local jet stream) was expected to transport more moist air mass upstream rapidly northward overnight Sunday/Monday above sharp frontal inversion — a warm and cold temperature difference with altitude in the atmosphere. At 3:52 a.m. it was 56°F in Carbondale and 45°F in Champaign.

Thunderstorms were expected to develop just after midnight to the west of Chicagoland near the Mississippi River, . A fragmented, weak storm line developed from northwest Cook County to Peoria by 11:10 p.m. but did not become significant. Showers and thunderstorms were located along a line from Quad Cities to Peoria to Danville, and moving southwest to northeast at 4:50 a.m.

Low temperatures overnight Sunday/Monday held at about 38°F to 40°F, and are forecast to begin rising about 6:00 a.m. The temperature is forecast to rise to 46°F by noon Monday and to 53°F (high) from 6:00 p.m. to 7:00 p.m. The low temperature during the heavy rain period is expected be 52°F around 9:00 p.m. Monday. Tuesday may reach 61°F around noon.

Wind gusts of 14 to 26 MPH from the southwest are forecast to begin about noon and continue until 5:00 a.m. Monday. A second period of southwest wind gusts of 17-24 MPH are forecast for Tuesday from 7:00 a.m. until 2:00 p.m.

While thunderstorms are forecast for the area Monday through Tuesday, no severe thunderstorms area forecast.

february.chicagoweatherstation.com

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Chicago Weather Forecast for your MAC/PC/TABLET includes surrounding suburbs.

NWS Forecast

Monday/Washington’s Birthday: Showers and possibly a thunderstorm. Areas of dense fog. High near 53. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Monday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rain. Patchy fog before 2am. Steady temperature around 54. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Tuesday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rain. High near 61. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.

Tuesday Night: Rain and sleet before 4am, then sleet likely between 4am and 5am, then snow, freezing rain, and sleet likely after 5am. Low around 30. West southwest wind around 10 mph becoming north northwest after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 90%.

Wednesday: Partly sunny, with a high near 37

Wednesday Night: Mostly cloudy, with a low around 27.

FLOOD WATCH

Flood Watch
National Weather Service Chicago/Romeoville IL
346 AM CST Mon Feb 19 2018

Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Lake IN-Porter-Newton-Jasper-Benton-
Including the cities of Rockford, Belvidere, Woodstock, Waukegan,
Oregon, Dixon, DeKalb, Aurora, Elgin, Wheaton, Chicago, Ottawa,
Oswego, Morris, Joliet, Kankakee, Pontiac, Watseka, Paxton, Gary,
Valparaiso, Morocco, Rensselaer, and Fowler
346 AM CST Mon Feb 19 2018 /446 AM EST Mon Feb 19 2018/

…FLOOD WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH LATE
TUESDAY NIGHT…

The Flood Watch continues for

* Portions of Illinois and Indiana, including the following
areas, in Illinois, Boone, Cook, DeKalb, DuPage, Ford, Grundy,
Iroquois, Kane, Kankakee, Kendall, La Salle, Lake IL, Lee,
Livingston, McHenry, Ogle, Will, and Winnebago. In Indiana,
Benton, Jasper, Lake IN, Newton, and Porter.

* From this evening through late Tuesday night.

* Unseasonably warm and moist air will overspread the region
beginning today, with several rounds of showers and
thunderstorms expected between today and Wednesday. Expect area
wide rainfall totals of over an inch with many areas
potentially receiving 2 to 4 inches.

* Ground remains frozen, therefore much of the rain will result in
rapid runoff. In addition, many areas north of I-80 still have
snow on the ground and melting of this snow will compound
runoff from heavy rainfall. Ice jam break up is also a concern.
Expect rises on area rivers and streams that may result in
flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A Flood Watch means there is a potential for flooding based on
current forecasts.

You should monitor later forecasts and be alert for possible
Flood Warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop.

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