WINTER STORM WARNING with 12 to 18 Inches Snowfall Possible Some Local Areas; Worst of It 9 PM Sunday to 12 PM Monday

WINTER STORM WARNING IN EFFECT FROM 9 PM CST SUNDAY TO NOON CST MONDAY…

* WHAT…Dangerous to impossible travel conditions due to intense lake effect snow expected. Snow rates in excess of 3 inches per hour, localized total snow accumulations of 12 to 18 inches, and northerly wind gusts in excess of 30 mph are expected.

* WHERE…Central Cook, Eastern Will, Northern Cook, and Southern Cook Counties.

* WHEN…From 9 PM this evening to noon CST Monday.

* IMPACTS…Snow rates in excess of 3 inches per hour will cripple travel, including during the Monday morning commute. Strong northerly wind gusts in excess of 30 mph will lead to greatly reduced visibility, especially near the Lake Michigan shoreline. Periods of thundersnow will occur, as well.

* ADDITIONAL DETAILS…Lake effect snow is often very localized, with conditions varying from safe to dangerous across just a few miles. Snow totals in the Winter Storm Warning area may vary considerably from one location to the next.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

Persons should consider delaying all travel while and where the lake effect snow is ongoing.

A frigid airmass is descending into the Central U.S. this weekend, spreading into the East Coast on Monday while the West warms up. Expect snowy, very cold and windy conditions from the Northern Plains to the Great Lakes this weekend.

A band of lake effect snow will migrate from near Chicago to Michigan City through the morning. There is a low to medium (40 to 60%) chance for a slushy 1 to 3 inches of snow to accumulate with the band of snow, mainly in northwestern Indiana.

A period of dangerous and intense lake effect snow is expected tonight into Monday in northeastern Illinois and northwestern Indiana. The peak coverage of lake effect snow should be between 12 AM and 10 AM Monday. Travel is not advised during periods of lake effect snow.

A gradual warming trend, possibly accompanied by periods of breezy winds, is expected toward the middle of next week.

Downtown Arlington Heights Snowfall Forecast
SUNDAY 3AM to 8AM …0.6 inch
SUN-MON 6PM to 8AM … 4.4 inches
MON 8AM to 12 PM … Lake Effect Snow localized and unpredictable, but somewhere in Chicagoland there might be 12-18 inches of snowfall.

Total System Snowfall Forecast, excluding Lake Effect Snow 8AM to 12 PM Monday … 5.0 inches

The low pressure system responsible for bringing rain and snow to the area overnight Saturday and Sunday will continue shifting eastward Sunday morning allowing for precipitation to end from west to east. The exception will be near Lake Michigan as a band of lake effect snow (already extending across Cook County) gradually pivots east-southeastward through the morning hours. As low-level convergence increase down the spine of the lake after daybreak, the intensity of the lake effect snow band should similarly increase (roughly as the band is moving from northeastern Illinois into northwestern Indiana). In northwest Indiana, a quick 2-3″ of snow may fall across parts of Lake and Porter counties between 8 and 11 AM CT.

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By early afternoon, the the first of two lake effect snow bands should be east of Chicagoland. Cooling low-level thermal profiles within pockets of stratocumulus clouds look to be supportive of occasional flurries throughout the day on Sunday, with highs only topping off in the low to mid 30s. A few bonafide snow showers may develop by early Sunday evening (6PM to 8PM), though little to no snow accumulation is expected. Attention then turns about 9 PM toward the threat for unusually intense and dangerous lake effect snow Sunday Night and into Monday about 8 AM, when about 4.4 inches is forecast.

Strong winds will also impact the Great Lakes and Upper Midwest through Monday afternoon, due to a tightening pressure gradient caused by convergence of the digging trough in the East and the approaching ridge from the West.

A powerful polar vortex lobe descending down Lake Michigan into our area, followed by the effect of a mesolow in from Lake Superior is forecast to cause unusually intense lake snow that is forecast to include northwest Indiana and northeast Illinois — possibly as far west as I-39 and as far south as Central Illinois.

Scattered to isolated rain showers and thunderstorms will spread from the Ohio Valley to Mid-Atlantic/Northeast Sunday. Rainfall will quickly come to an end over New England on Monday. The Arctic airmass will expand from the Great Plains and Mississippi Valley today into the East Coast on Monday. Overnight lows likely in the 20s and 30s through Monday night prompted freeze watches and warnings from parts of the Southern Plains across the Lower Mississippi Valley and into the Southeast/Mid-Atlantic.

Weather Radarat 3:50 AM shows precipitation indicating the last band of Saturday – Sunday overnight passing northeast Illinois.

See also Arlingtoncardinal.com/clouds

 ARL HTS FORECAST … 

Overnight Saturday/Sunday: Snow likely, possibly mixed with rain, becoming all snow after 4am. Cloudy, with a low around 31. North wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.

Sunday: A 50 percent chance of snow before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 32. Breezy, with a north northwest wind 15 to 20 mph, with gusts as high as 30 mph.

Sunday Night: Snow likely, mainly between midnight and 3am. The snow could be heavy at times. Some thunder is also possible. Mostly cloudy, with a low around 26. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New snow accumulation of 3 to 5 inches possible.

Monday: A 30 percent chance of snow before 9am. Mostly sunny, with a high near 36. North northwest wind around 15 mph, with gusts as high as 35 mph.

Monday Night: Partly cloudy, with a low around 24. West northwest wind 5 to 10 mph, with gusts as high as 20 mph.

Veterans Day: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 41.

Tuesday Night: Partly cloudy, with a low around 34.

Wednesday: Sunny, with a high near 49.

Wednesday Night: Partly cloudy, with a low around 32.

Thursday: Sunny, with a high near 52.

Thursday Night: Partly cloudy, with a low around 36.

Friday: Mostly sunny, with a high near 56.

Friday Night: Mostly cloudy, with a low around 44.

Saturday: Mostly cloudy, with a high near 63.

U.S. HIGH AND LOW TEMPERATURE
(for the contiguous United States)
NWS Weather Prediction Center, College Park, MD
Issued 1 am EST Sunday, November 9, 2025

High Temperature for Saturday, November 8, 2025
(as received by 1 am EST November 9)
99°F at 2 miles north-northeast of LaPuerta, TX

Low Temperature for Saturday, November 8, 2025
(as received by 1 am EST November 9)
5°F at 20 miles west-southwest of Dubois, WY

 POLLEN COUNT … 

LOYOLA MEDICINE ALLERGY COUNT
x.com/LoyolaAllergy

Pollen Count Returns Spring 2026

 LAKE TEMPS … 

SOUTHERN LAKE MICHIGAN WATER TEMPERATURES
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
853 AM CST Sat Nov 8 2025

LAKE MICHIGAN WATER TEMPERATURES…

CHICAGO SHORE………..52.

CHICAGO CRIB…………56. MEASURED AT A DEPTH OF 30 FT.

WAUKEGAN BUOY………..51.

WINTHROP HARBOR BUOY….51.

MICHIGAN CITY………..54.
MEASURED AT A DEPTH OF 60 FT AND
MAY NOT REPRESENT SURFACE TEMP.

SOUTH MID LAKE BUOY…..55.

NORTH MID LAKE BUOY…..52.

november.chicagoweatherstation.com

Arlingtoncardinal.com/radar/#enter

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