A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >
Overview
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Sunday, January 7 saw persistent light freezing rain and drizzle over the area over a span of six to nine hours. At brief times this was mixed with sleet and snow, but was mainly an icing event during the afternoon. After dark, the precipitation gradually transitioned to snow by mid-evening. This event came on the heels of a significant cold weather period from Dec 26-Jan 6, which meant ground and pavement temperatures were below freezing. This furthered the icing on roads and created very hazardous travel conditions. A Winter Weather Advisory was issued for generally south of Interstate 80 in the early morning of January 7, and this was expanded northward early in the afternoon.
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 January 7 13-hour radar loop from 10:30 a.m.-11:30 p.m. Overlaid in yellow are mPing observations. Symbols are drops (rain), drops with a horizontal "S" (freezing rain), S with a circle (sleet), and asterisk shape (snow). |
Ice Accretion
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
220 AM CST MON JAN 08 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1200 AM FREEZING RAIN OHARE AIRPORT 41.98N 87.90W
01/08/2018 M0.05 INCH COOK IL ASOS
ICE ACCRETION FOR JANUARY 7TH.
1200 AM FREEZING RAIN MIDWAY AIRPORT 41.78N 87.75W
01/08/2018 M0.01 INCH COOK IL ASOS
ICE ACCRETION FOR JANUARY 7TH.
1200 AM FREEZING RAIN ROCKFORD AIRPORT 42.20N 89.10W
01/08/2018 M0.10 INCH WINNEBAGO IL ASOS
ICE ACCRETION FOR JANUARY 7TH.
1200 AM FREEZING RAIN WEST CHICAGO 41.89N 88.22W
01/08/2018 M0.12 INCH DUPAGE IL ASOS
ICE ACCRETION FOR JANUARY 7TH AT DUPAGE AIRPORT.
1200 AM FREEZING RAIN WHEELING 42.13N 87.92W
01/08/2018 M0.01 INCH COOK IL ASOS
ICE ACCRETION FOR JANUARY 7TH AT CHICAGO EXECUTIVE
AIRPORT.
1200 AM FREEZING RAIN SUGAR GROVE 41.77N 88.46W
01/08/2018 M0.08 INCH KANE IL ASOS
ICE ACCRETION FOR JANUARY 7TH AT AURORA AIRPORT.
1200 AM FREEZING RAIN VALPARAISO 41.48N 87.05W
01/08/2018 M0.07 INCH PORTER IN ASOS
ICE ACCRETION FOR JANUARY 7TH AT PORTER COUNTY REGIONAL
AIRPORT.
1200 AM FREEZING RAIN WAUKEGAN 42.37N 87.87W
01/08/2018 M0.03 INCH LAKE IL ASOS
ICE ACCRETION FOR JANUARY 7TH.
1200 AM FREEZING RAIN ROMEOVILLE 41.65N 88.09W
01/08/2018 E0.08 INCH WILL IL OFFICIAL NWS OBS
ICE ACCRETION FOR JANUARY 7TH AT NWS CHICAGO.
&&
$$
RC
Meteorology
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| An explanation of different precipitation types. | A look at the observed atmosphere over central Illinois on January 7 that was representative of much of the local area. |
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