Winter Storm Warning Still in Effect

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Winter Storm Warning remains in effect until midnight CST
tonight... 

* timing... light snow will persist through this evening. Periods
  of moderate to heavy snow are possible at times early this
  morning and again this afternoon.

* Snow accumulations... an additional 3 to 6 inches of snow is
  expected today. This will result in a storm total of 5 to 9
  inches.

* Visibilities... look for reduced visibilities during the 
  heavier snowfall... likely below a mile at times. 

* Impacts... plan on difficult driving conditions.

Precautionary/preparedness actions... 

A Winter Storm Warning for heavy snow means severe winter weather
conditions are expected or occurring.  Significant amounts of
snow are forecast that will make travel dangerous. Only travel in
an emergency. If you must travel... keep an extra flashlight... 
food... and water in your vehicle in case of an emergency.

 




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Winter Storm Warning for heavy snow

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Winter Storm Warning in effect from 3 PM this afternoon to
midnight CST Sunday night... 

The National Weather Service in Chicago has issued a Winter Storm
Warning for heavy snow... which is in effect from 3 PM this
afternoon to midnight CST Sunday night. The Winter Weather
Advisory is no longer in effect.

* Timing... expect snow to develop this afternoon and then 
  diminish by Sunday evening. 

* Snow accumulations... the heaviest totals are expected north of
  Interstate 88 where storm totals of 7 to 11 inches are likely by
  Sunday evening. South of Interstate 88 to the I-80 corridor
  totals of 5 to 9 inches are expected by Sunday evening. Snow
  amounts should tapper off south of Interstate 80 into the 3 to 6
  inch range across far southern sections of the warning
  area... where the snow could mix with rain later Sunday.

* Visibilities... look for reduced visibilities during the 
  heavier snowfall... likely below a mile at times. 

* Impacts... plan on difficult driving conditions.

Precautionary/preparedness actions... 

A Winter Storm Warning for heavy snow means severe winter weather
conditions are expected or occurring.  Significant amounts of
snow are forecast that will make travel dangerous. Only travel in
an emergency. If you must travel... keep an extra flashlight... 
food... and water in your vehicle in case of an emergency.

 

 




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NWS Releases Detailed Weather Forecast

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Winter Storm Watch remains in effect from Saturday afternoon
through late Sunday night...

* timing...snow will develop over the area by mid to late 
  Saturday afternoon and continue through Sunday evening. 

* Snow accumulations...in excess of 6 inches possible.

* Main impact...the potential of snow covered roads and low 
  visibilities may make travel hazardous. 

Precautionary/preparedness actions...

A Winter Storm Watch means there is a potential for significant
snow...sleet...or ice accumulations that may impact travel.
Continue to monitor the latest forecasts.

 

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
331 AM CST Sat Dec 10 2016

.SHORT TERM…
331 AM CST

Through Sunday night…

Challenging forecast tonight through Sunday evening with potential
for a long duration snow event with significant totals, especially
northern half of the CWA. Questions remain about how much precip
will fall and potential for mixed precip and much lower snow:liquid
ratios (SLRs) Sunday into Sunday night. This event absolutely does
not fit the conceptual model of a warning worthy snowfall event
locally, so given the expected very long duration of the event and
primarily light to moderate snowfall accumulation rates, we’re
opting to upgrade the winter storm watch to a winter weather
advisory. Since we are teetering along the edge of warning
criteria over northern most CWA, it is possible that some areas
may need to be upgraded to a warning, but after collaboration
internally and with DVN felt this was the best course of action.

Meteorologically, a fairly strong Pacific jet stream will
translate eastward into the the Great Lakes region later today
and through Sunday. Height falls in advance of a fairly low
amplitude short wave will result in back low/mid level flow across
the area today, tightening up the thermal gradient with
strengthening isentropic ascent/warm air advection likely to
result in a swath of snow developing east into northern IL late
this afternoon and into northwest Indiana by early evening.

Guidance is in pretty good agreement with QPF through 12z Sunday,
with maybe up to an inch or so of snow possible between 2-6pm
western CWA. Tonight (00z-12z Sunday) guidance paints a swath of
QPF over northern half of the CWA in the neighborhood of 0.25″,
which given fairly efficient ratios should fluff up to 2 to
perhaps 5 inches of snow. Time-height cross sections suggest that
while the dendritic growth zone will be deep, especially the first
half of the night, ascent within that layer is not expected to be
particularly strong and progged RH wrt to ice is not super
saturated, so extremely efficient dendrites appear unlikely to be
the primary/dominant crystal type, none the less it should be a
dry snow that should fluff up to 15 to perhaps 20:1 ratio.

GFS and NAM both show transient waves of modest f-gen, but
neither model suggests that a deep sustained frontogenetic
circulation will become established and park overhead like last
weekend. In addition, atmosphere looks to be largely pretty stable
tonight with only a shallow layer of weakly negative EPV
developing for a short time late tonight into early Sunday
morning, which could correspond to timing-wise to some stronger
transient snow bands. Given the largely stable conditions tonight,
the potential for narrow intense banded snowfall looks low.
Again support the notion that this event tonight has the look of
a steady light to occasionally moderate snowfall event.

QPF from the various models varies more substantially heading
into Sunday. Warm air advection is expected to begin to result in
steady warming of the low to mid levels of the column Sunday. At a
minimum, this should result in a gradually wetter and less
efficient snowfall with time Sunday. In addition, the persistent
WAA should begin to push temps above freezing in the afternoon,
especially southeast of I-55 corridor and into downtown Chicago.
While forecast soundings generally keep the column cold enough for
all snow, the surface low track into southern WI conceptually
would support the potential for some mixed of precip as far north
as Chicago. Some guidance also suggests mid level drying, which
could result in the loss of ice nuclei and a transition to drizzle
Sunday, this is mainly over southern CWA. Have gone with fairly
low SLRs over southern half of the CWA in the afternoon Sunday
due to the potential for mixed precip and above freezing temps,
which does lead to a sharp southern cut off to the heavier snow
accumulations, which is pretty typical in these type of events and
being depicted pretty nicely by some of the higher resolution
guidance.

Generally looking for snowfall totals in the 6 to locally 10″
range along and north of the I-88/I-290 corridor, but the snowfall
rates look to generally remain below the 6″/12 hour and 8″ in 24
hour warning criteria. Also, hitting on a weekend and likely
peaking in the middle of the night tonight could lessen the
impacts some, which given the borderline warning criteria supports
starting with an advisory and upgrading when/if it becomes clear
heavy snow will materialize. In the heavier accumulating snow
swath (generally along north of I-80) expecting up to an inch of
so through 6pm this evening, 2-5″ tonight, an additional 1-4″
Sunday. Snow or mix should end from west to east by late
afternoon west and during the evening Sunday over NW IN.

Izzi

&&

.LONG TERM…
314 AM CST

Long Term…

Monday Through Saturday…

Main concern for the long term forecast period will be temperature
trends with the coldest air of the season expected.

Monday will be a transitional day as the system bringing the pcpn
lifts through the eastern Great Lakes and continental polar area of
high pressure builds across the middle Mississippi Valley and into
the Ohio Valley. This will not be a particularly cold air mass and
max temperatures for Monday will be in the 20s, though this will be
8 to 10 degrees lower than the warm sector airmass ahead of the
passing cold front. With the cold front passing across the region
Sunday night and modest cold advection setting up following the
fropa, temperature trends will likely be very flat through the day.

The surge of arctic air will begin to push into the region
following the passage of a secondary cold front Monday night.
This will be a true arctic airmass and the cold advection behind
this front will be quite strong. Max temps for the calender day
for Tuesday will likely occur during the late night hours and then
steadily drop through the day and Tuesday night. By sunset
Tuesday afternoon, temps should drop into the single digits over
the nwrn portions of the CWA, including the rockford area. There
is a chance for some light snow or flurries with the fropa, but
the system will generally be moisture starved and little
additional snow accumulation is likely. Strong high pressure will
build through the cntrl plains, and across the middle Mississippi
Valley, and become centered over nrn IL Tuesday night. By
Wednesday morning, temps will drop into the lower single digits
above zero west of the fox Valley with lows arnd 10 F east of the
I-55 corridor. A weak, sheared out shortwave crossing the midwest
will bring another chance for some light snow and the associated
cloud cover will allow for much in the way of diurnal warming. The
mid level system will move across the area relatively quickly
and bring another inch or 2 of snow on Wednesday. The coldest day
of the period will be Thursday. Temps thursday morning are
expected to range from around -5 F over ncntrl IL to +5 F over
ecntrl IL/wcntrl IN. There is some concern that even these low
temps may be a bit conservative, with some of the longer range
guidance, in particular the raw model output of the GFS and ECMWF
suggesting that sub-zero temperatures could overspread the entire
CWA, with MOS influenced guidance bringing a little too much
climatology to the mix, which would suggest the slightly higher
temperatures. Given some uncertainty, particularly in how much sky
clearing can occur overnight and into Thursday morning, have opted
not to go too extreme with min temps, but there is a chance that
temps could be a bit lower than currently forecast. The same logic
applies to Thursday and Thursday night into Friday morning. max
temps across the area should remain in the single digits on
Thursday with lows ranging from arnd -5 F to +5 F again Friday
morning. Wind Chill readings will also be a factor for Wednesday
night and Thursday night. The longer term models are indicating
enough breeziness these nights to generate wind chill readings of
-10 to -20 F. Temps should remain well below normal for Friday and
into next weekend, with a slight warming trend bringing temps back
into the upper teens to lower 20s by next Saturday.

&&

.AVIATION…
For the 06Z TAFs…

Main forecast concern remains snow developing Saturday afternoon
and continuing through Sunday evening…along with associated
vis/cigs.

Overall…no significant changes from the 00Z tafs. Light snow is
expected to develop over northwest IL by mid afternoon and spread
across the Chicago area terminals by late afternoon. The snow may
become moderate enough to allow visibilities to drop below 1sm for
a few hours Saturday evening. While light snow would likely
continue into the late evening…models are in reasonable
agreement of a period of lighter precip and this will likely allow
vis to improve above 1sm and possibly above 2sm. Confidence is
medium to high during this period…but trends will need to be
monitored and some timing differences/tweaks can be expected.

By early Sunday morning…during the 24-30hr period of the ord
taf…appears moderate snow will become prevailing prior to
sunrise Sunday morning and may eventually become heavy. Despite
being at the end of the period…confidence also medium/high with
visibilities dropping to 1/2-3/4sm and this will likely
continue…at least at times…through much of Sunday. There may
be a sharp cutoff to the heaviest snow…so confidence in these
conditions at mdw/gyy is currently somewhat lower…but this time
period is also beyond the 24hr period of this forecast at mdw/gyy.

Westerly winds mainly under 10kts tonight will turn more to the
southwest Saturday mid/late morning…turning southerly by late
Saturday afternoon and then southeasterly Saturday evening. Speeds
will eventually increase to 10kts Saturday evening and then likely
to 10-15kts early Sunday morning. cms/bmd

&&

.MARINE…
325 PM CST

Low pressure is expected to develop over the Central Plains
Saturday night into Sunday turning winds southerly across Lake
Michigan, then the low is expected to lift across southern Lake
Michigan Sunday night with north to northwest flow overspreading
the lake behind the low Monday. A stronger arctic cold front is
then expected to move over the lakes region late Tuesday. This
will result in a period of impactful west-northwesterly winds
over the lake Wednesday into Thursday as an arctic cold front
moves over the lake. Gales will be a good possibly, along with the
threat of freezing spray during this period.

KJB

&&

.LOT WATCHES/WARNINGS/ADVISORIES…
IL…Winter Weather Advisory…ILZ003-ILZ004-ILZ005-ILZ008-ILZ010-
ILZ011-ILZ012-ILZ019-ILZ020-ILZ021…3 PM Saturday TO 6 PM
Sunday.

Winter Weather Advisory…ILZ006-ILZ013-ILZ014-ILZ022…6 PM
Saturday TO 10 PM Sunday.

IN…Winter Weather Advisory…INZ001-INZ002…6 PM Saturday TO 10 PM
Sunday.




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National Weather Service Releases Information On Today Snow Forecast




Update from the National Weather Service at 5:51 am this morning:

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
551 AM CST Sun Dec 4 2016

.SHORT TERM...
324 AM CST

Through tonight...

Main forecast concerns/challenges are with the expected
accumulating snow over much of northern Illinois and northwest
Indiana this morning into the late afternoon. Main forecast
changes this morning were to increase snowfall amounts and expand
the advisory southeast to now include Livingston/Kankakee counties
in Illinois and Lake/Porter counties in northwest Indiana.

Everything still appears to be on track for the first
accumulating snowfall today. Upper level trough noted on satellite
imagery, with several embedded impulses quickly lifting northeast
into the mid Mississippi Valley. Ahead of this feature, isentropic
ascent is also helping to saturate the column. Although returns
noted on radar, this saturation has not occurred quite yet, with
snow not occurring at this time. Adjusted pops in the near term to
reflect latest trends with upper level support providing the onset
of snow across the far western CWA right around 12Z. This would
include all areas in the west, along the I-39 corridor. Remaining
areas to the east in northern Illinois still on track for right
around a 15z time frame, and then soon there after for areas in
northwest Indiana. Given this noted time line, have adjusted
timing of the advisory, mainly to delay the eastern half until
15z.

As this upper level trough swings through the area later this
morning into the afternoon, expect a transition from light snow to
more moderate intensity snow as large scale ascent really ramps up
ahead of this feature. Most guidance in agreement with the
increase in forcing due to many features coming together, which
include a stout negatively tilted trough and more potential for
instability aloft. Would anticipate many locations across much of
northern Illinois and northwest Indiana to see this ramp up in
snow intensity by midday, and even more so by early to mid
afternoon. This not only includes areas along the I-39 corridor
which was previously noted, but now also includes many areas in
the northern two thirds of the CWA likely centered from just north
of I-88 south to along/south of I-80. In these locations, strong
forcing and more efficient snow production will likely allow for
an increase in snow amounts even into the afternoon when the more
intense snow will be able to offset melting. In the height of the
more intense snow, 18-23Z, am a little concerned that the snow
will come down hard enough to accumulate more on the roadways with
at least slushy conditions possible. All of this and the increase
in snow amounts, feel the advisory is still warranted and worthy
of expansion. Now have snow amounts of 3-5 inches along the I-39
corridor, 2-4 inches elsewhere in the advisory in northern
Illinois and northwest Indiana, and then 1-3 inches across the far
southeast CWA. In this location, rain may briefly mix with snow
but do think forcing will be strong enough even in this location
to help the column/boundary layer to cool to support all snow in
the afternoon. Snow will quickly taper off right around the 00z
time and although some light snow may still be ongoing across the
eastern CWA in the 00-03z period, it will likely be light enough
to not warrant extension of the advisory.

Rodriguez

&&

.LONG TERM...
347 AM CST

Monday through Saturday...

Monday appearing dry/quiet on the backside of this system with
rising heights and building high pressure. Continued WAA will
usher in a warmer airmass but wonder what impact this will have on
high temps with cloud cover possibly lingering and with a snow
pack likely in place. Still keeping an eye on two possible systems
to affect the area during the week. Confidence is still on the
lower side with the first system arriving Monday night into
Tuesday. Timing and placement adding to the low confidence as well
as extent of the airmass which would be in place. Have continued
to limit pops as well as continued to mention both snow and rain.
Much colder airmass still expected later in the week, however,
confidence also remains low with snow potential Wednesday night
into Thursday. Still remains a possibility for snow but with
varying guidance, no change in confidence. Much colder air and
lake effect snow potential will then be concerns through the
remainder of the work week, as well as snow potential returning
CWA wide by the weekend.




Winter weather advisory has been issued for our area





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It is official. Our first winter advisory of the season has now officially been issued.  Please use caution when driving! 

 

Winter Weather Advisory in effect from 7 am to 6 PM CST
Sunday... 

The National Weather Service in Chicago has issued a Winter
Weather Advisory for snow which is in effect from 7 am to 6 PM
CST Sunday.

* Timing... light to moderate snow will begin Sunday morning and
  continue through Sunday afternoon.

* Snow accumulations... 2 to 4 inches with the heaviest amounts
  generally northwest of a Chicago to Peru line.

* Main impact... slippery conditions are expected on untreated
  surfaces... creating hazardous travel.

* Other impacts... visibility may fall to around one half mile at
  times... causing an additional travel hazard.

* Note... impacts may be mitigated by mild Road temperatures on
  heavily traveled roads... such as in the city of Chicago and
  immediate suburbs.

Precautionary/preparedness actions... 

A Winter Weather Advisory for snow means that periods of snow
will cause primarily travel difficulties. Be prepared for snow
covered roads and limited visibility... and use caution while
driving.

 




 

 

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Multiple Ambulances Dispatched To An Accident On local Highway




Around 4:30 pm today several units were dispatched to the area of I-90 near mile marker 23. Scanner traffic is saying there is an auto accident near this location. One person is down on the ground. injuries are being reported. At least 2 ambulances have been dispatched to the scene.







House Fire Near Roscoe

 

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Around 9:35 pm tonight several emergency personnel were dispatched to an address on Wild Deer Trail near Roscoe. Scanner traffic is saying there is a house fire near this location. Everyone is reported to be out of the residence. Emergency personnel are en route

UPDATE: Confirmed active fire. Mutual aid requested from nearby fire departments.




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Another Multiple Vehicle Accident on I-90, Vehicle Has Rolled Over

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Just before 2:30 pm today several agencies were dispatched to I-90 near the stateline. There is a multiple vehicle accident with injuries near the rest stop. At least one vehicle involved has rolled over. Several area departments were dispatched to the scene. Still developing, avoid I-90 near the stateline, or expect delays

 



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Winnebago County Sheriff Also Doing Saturation Patrols, For “Drive Sober Or Get Pulled Over”

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Note: Rockford Police and Illinois State police, Boone/Belvidere police are all doing this campaign also.  Articles posted on our website (A quick search will pull the articles up) on these departments.

 

 

 

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