Arlington Heights Near Edge of Freeze Line with Low of 37°F at 6:00 AM, Arlington Heights, Chicago Weather Forecast Northwest

Freeze fails to materialize in Arlington Heights; attention turns now to Critical Fire Conditions Friday and especially Saturday for Chicagoland.

A Freeze Warning was activated outside of the City of Chicago as temperatures in the upper 20 and even mid-20s were possible outside the city. The surface high pressure nearby was not optimally positioned for the coldest extreme overnight, but a cool and very dry air mass favored a boundary layer quickly decoupling outside of the Chicago urban heat island. Lows in the upper 20s to lower 30s outside the city appeared reasonable, with some mid 20s possible in the usual cool spots along and west of the Fox Valley.

UPDATE: No visible frost Friday morning and no dew on leaves on grass. The Dew Point was 22-23°F at midnight Thursday/Friday and 24°F overnight through 6:51 a.m. Friday. Relative Humidity was only 43% at 11:51 p.m.Thursday and gradually rose to 59% at 6:51 a.m. Friday at the National Weather Service station at O’Hare International Airport.

Arlington Heights was on the edge of the freeze line with northwest Arlington Heights more likely to report a freezing temperature than southeast Arlington Heights. Central Arlington Heights held to 37°F at 6:00 a.m. Areas south and east of O’Hare International Airport including the airport were not issued a Freeze Warning last night, but Arlington Heights was issued a Freeze Warning. As of 6:00 a.m. it appears Arlington Heights will stay above freezing for Friday morning.

At 2:22 a.m. the fall in temperature was lagging the forecast by about 2°F with a temperature of 40°F instead of 38°F.

Some weather concerns remain …

* Freezing temperatures tonight further outside of Chicago

* Gusty winds and elevated fire danger on Friday afternoon

* Isolated to widely scattered showers on Friday afternoon, some
possibly producing graupel (small hail)

* Very strong southerly winds gusting up to 45-50+ mph on
Saturday and possibly Critical Fire Weather conditions

Weather Radar in northeast Illinois was clear 10:40 p.m. Thursday through 6:00 a.m. Friday.







 O’HARE FORECAST … 

Overnight: Clear, with a low around 35. West southwest wind around 5 mph.

Friday: Scattered showers, mainly after noon. Increasing clouds, with a high near 56. Breezy, with a southwest wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 30%.

Friday Night: Isolated showers before 8pm. Partly cloudy, with a low around 38. West southwest wind 5 to 10 mph becoming south after midnight. Chance of precipitation is 20%.

Saturday: Mostly cloudy, with a high near 64. Windy, with a south wind 10 to 20 mph increasing to 20 to 30 mph in the afternoon. Winds could gust as high as 45 mph.

Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 46. Breezy, with a south southwest wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 35 mph.

Sunday: A 50 percent chance of showers. Mostly cloudy, with a high near 54. Northwest wind 10 to 15 mph.

Sunday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 37.

Monday: A 30 percent chance of showers, mainly after 1pm. Mostly cloudy, with a high near 52.

Monday Night: A chance of showers. Mostly cloudy, with a low around 42.

Tuesday: A chance of showers. Partly sunny, with a high near 57.

Tuesday Night: A chance of showers. Mostly cloudy, with a low around 44.

Wednesday: Mostly sunny, with a high near 57.

Wednesday Night: A slight chance of showers. Partly cloudy, with a low around 46.

Thursday: A slight chance of showers. Partly sunny, with a high near 63.

 LAKE TEMPS … 

SOUTHERN LAKE MICHIGAN WATER TEMPERATURES
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
904 AM CDT Thu Oct 15 2020

LAKE MICHIGAN WATER TEMPERATURES…

CHICAGO SHORE……….61.

CHICAGO CRIB……….60.

WILMETTE BUOY……….52.

WINTHROP HARBOR BUOY……….47.

SOUTH MID LAKE BUOY……….58.

NORTH MID LAKE BUOY……….56.

&&

M IS FOR MISSING DATA THAT IS NORMALLY AVAILABLE.

october.chicagoweatherstation.com

Arlingtoncardinal.com/radar

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