Sunday Night's Snowfall

10:30am Update: The center of the surface low pressure system has now moved into southeast Wisconsin with fog and haze over much of northern Illinois and southern Wisconsin.  Colder air on the backside of the low will begin to move into the Stateline Monday afternoon, bringing temperatures down into the single digits by the afternoon and evening, and then below zero by Monday night.

Winter Weather Advisories are now in effect for all of northern Illinois (counties in purple) while Winter Storm Warnings are in effect for southern Wisconsin (counties in pink).








(9:10:43 AM) nwsbot: Local Storm Report by NWS MKX: 1 ESE Beloit [Rock Co, WI] cocorahs reports SNOW of M3.2 INCH at 07:20 AM CST -- cocorahs station wi-rk-15, beloit.

(9:10:43 AM) nwsbot: Local Storm Report by NWS MKX: 1 N Janesville [Rock Co, WI] co-op observer reports SNOW of M0.9 INCH at 27 Jan, 09:30 AM CST -- co-op observer station argw3, argyle.

Update snowfall totals so far Monday morning.  Snowfall totals range anywhere from 3-6 inches area wide Monday morning.  Additional snow totals will be added throughout the morning.







(7:42:37 AM) nwsbot: Local Storm Report by NWS DVN: Freeport [Stephenson Co, IL] trained spotter reports SNOW of M6.0 INCH at 07:40 AM CST -- total.

(7:45:38 AM) nwsbot: Local Storm Report by NWS DVN: 2 SE Galena Territory [Jo Daviess Co, IL] trained spotter reports SNOW of M4.1 INCH at 07:44 AM CST -- total.

(7:47:58 AM) nwsbot: Local Storm Report by NWS DVN: Milledgeville [Carroll Co, IL] trained spotter reports SNOW of M3.6 INCH at 07:47 AM CST -- total.

Here are a few snow totals we've received so far this morning.  Most of the accumulating snow is done, but a quick inch or two remains possible later this afternoon.  Blowing and drifting snow likely through the afternoon and evening commute.

7:30am Update: Updated road conditions across northern Illinois - roads reported nearly all snow/ice covered Monday morning. 

(6:56:51 AM) nwsbot: Local Storm Report by NWS LOT: 1 S Rochelle [Ogle Co, IL] co-op observer reports SNOW of M3.2 INCH at 06:00 AM CST -- co-op observer station rchi2, rochelle.

6:40am Update: Current road conditions per IDOT Monday morning.  Meteorologist Ryan Belz is reporting some light freezing drizzle on the backside of the snow, causing a thin glaze on the windshield of the car.

6:20am Update: Dry air quickly moving into northern Illinois and southern Wisconsin has caused the snow to come to an end from west to east this morning.  So far the Rockford Airport has received 3.6 inches of snow.  Snow totals range anywhere from 3-5 inches area wide.

(6:18:48 AM) nwsbot: Local Storm Report by NWS LOT: Rockford Airport [Winnebago Co, IL] official nws obs reports SNOW of M3.6 INCH at 06:00 AM CST -- storm total so far

5:35am Update: Look at how strong winds are behind low pressure over northeast Iowa!  Winds will lighten up some this morning but then pick right back up during the afternoon.







(5:36:10 AM) nwsbot: Local Storm Report by NWS MKX: Milton [Rock Co, WI] public reports SNOW of M4.0 INCH at 03:00 AM CST --

5:15am Update: The snow is coming to an end from west to east this morning, but not before bringing between four to five inches across much of the area.  As low pressure moves closer to northern Illinois, winds will begin to lighten up during later this morning before increasing this afternoon from the northwest.  Blowing and drifting snow will be likely once again through the afternoon and evening commute.

Light snow will redevelop on the backside of the low with an additional inch or two coming down through late afternoon.

3:00am Update: Light to moderate snow continues to move east across the Stateline.  Snow totals have been slow to come in, but range between 2-4 inches so far.  Blowing and drifting snow from what's coming down, to what was already on the ground, will continue.  Roads remain snow covered and slick early Monday morning.  We will likely see the heaviest snow move east by 5am.

(2:53:25 AM) nwsbot: Local Storm Report by NWS MKX: Janesville [Rock Co, WI] public reports SNOW of M4.0 INCH at 02:00 AM CST --

1:50am Update: Look at that wind in Rochelle!  Lots of blowing and drifting snow.  The snow is very light and easily blown around.  The wind may lighten up a little between 6am and 9am, but should begin to increase once again mid to late morning and afternoon once low pressure passes.  Early Monday morning winds will be coming in from the southeast before shifting around to the northwest the rest of the day.

12:40am Update: Incoming band of moderate to heavy snow from the west.  Visibility will quickly drop with the gusty southeast winds, causing blowing and drifting snow in open areas.  Rapidly accumulating snow likely through 4am. 

 


11:00pm Update: Moderate snow is beginning to move into parts of Jo Daviess, Carroll and Whiteside counties.  Visibility has fallen under half a mile as road conditions continue to deteriorate under the more moderate snow bands.  Snowfall intensity will continue to increase after Midnight, lasting through roughly 5am/6am for some.



Here are the latest road conditions per IDOT.  Parts of Highway 20 are already reported as snow and ice covered.  Road conditions will continue to deteriorate through the night.

9:20pm Update: Light snow continues to fall across northern Illinois and southern Wisconsin, with already a light dusting being reported in some locations.  With temperatures in the single digits, the snow will quickly stick to untreated surfaces making roads slick late this evening.
Higher than normal snow to liquid ratios will cause the snow to be lighter and fluffy.  Increasing winds will cause the snow to blow around during the overnight, and into Monday afternoon.

 8:00pm Update: Light snow has started to move into northern Illinois and southern Wisconsin.  Right now most of it is light but the intensity should begin to increase between now and Midnight, becoming a little more steady during the overnight.




Winter Storm Warnings and Winter Weather Advisories remain in effect for all of northern Illinois and southern Wisconsin through Monday afternoon.

Heaviest snow is set to move in during the overnight, after Midnight, and continue into early Monday morning before tapering off to lighter snow showers throughout the day.  Moderate snow is already moving in from the

northwest over much of the Upper Midwest and will continue to spread eastward through the night.  Snowfall rates could be as high as one inch per hour under some of the heavier snow bands during the overnight. This combined with blowing snow will make travel difficult during heading into Monday morning.

Snowfall totals will likely range area wide between 4-9 inches, with the highest snow totals occurring on either side of Highway 20, and the lower snow totals further south.  Most of the accumulating snow will be wrapping up around 7am Monday, but as low pressure moves overhead there may also be a period of freezing drizzle that mixes in with some of the lighter snow.  If this occurs, it'll likely make travel even a little more slick into Monday afternoon.

Winds will then shift around to the northwest on the backside of the low during the afternoon bringing temperatures down below zero degrees by Monday night.