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(11:45AM - 2/14/21) A snowstorm is expected to affect the region today through Tuesday, bringing waves of accumulating snow to the state. Additionally, significant lake effect/enhanced snow is expected across Northeast Illinois.
Summary... A storm system will be impacting the region today through Tuesday, with an extended period featuring waves of accumulating snow for the state. The storm system will eject out from the Gulf of Mexico and into the Southeastern US, today and into Monday. The storm system will then move northeastward through the Appalachians on Tuesday. Model guidance from overnight and this morning has taken a shift northwest. This shift means the entire state is now expected to see an accumulating snowfall, with an increase in expected snowfall totals for a large area as well. With this update we have taken into account the shift in our forecast, with the aforementioned changes.
Forecast...
A lengthy period featuring waves of accumulating snow will affect the state, from this morning through Tuesday morning. Two more distinct periods of snow look to impact the state...One from this morning through Monday morning, and the second from Monday morning through Tuesday morning. The second period will feature the most organized and widespread snow, in addition to the heaviest snow and most snowfall accumulation. During this entire snowstorm period (Sun morning-Tue morning) snow will be of varying intensity, with a few breaks between periods/waves of snowfall being possible. Snow will be moderate to heavy at times, especially during the second period of snow Monday morning through Tuesday morning. During this time snowfall rates in excess of 1" an hour will be likely at times, especially across Central, Southern and Northeast Illinois. In addition to the synoptic snow, across Northeast Illinois lake enhanced snow is likely during the snowstorm and lake effect snow is likely after the snowstorm ends. This is expected to lead to lake boosted significant snowfall accumulations across portions of Northeast Illinois. Periods of moderate to heavy snow, with snowfall rates of 1-3" an hour, can be expected across counties near the lake.
What's Expected...
Final snowfall totals upwards of 4-9" are expected across Southern Illinois and a large portion of Central Illinois. Across Western, Northwest and North-Central Illinois...Totals will taper with northwest extent. Across Northeast Illinois where lake effect/enhancement is expected, snowfall totals of 6-12" are expected for counties near Lake Michigan. Below is the snowfall forecast for this event. 
JP
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(10:15PM - 2/13/21) A winter storm is expected to affect the region Sunday through Tuesday, bringing waves of accumulating snow to portions of the state. Additionally, lake effect snow will be possible across Northeast Illinois.
Summary... A storm system is expected to affect the region Sunday through Tuesday, with an extended period featuring waves of accumulating snow for portions of the state. The storm system will eject out from the Gulf of Mexico and into the Southeastern US, Sunday and into Monday. The storm system will then move northeastward through the Mid-Atlantic on Tuesday. Model guidance continues to come into better agreement as time goes on regarding aspects of this winter storm. As better agreement occurs and confidence increases, snowfall totals have been increased a bit for some areas, as well as a slight adjustment to the placement of the wide snowfall axis.
Forecast...
A lengthy period featuring waves of accumulating snow will affect a large portion of the state, from Sunday morning through Tuesday morning. During this time snow will be of varying intensity, with a few breaks between periods/waves of snowfall being possible. Snow will be moderate to heavy at times, with snowfall rates in excess of 1" an hour at times...Especially across Southern and portions of East-Central Illinois. In addition to the synoptic snow, across Northeast Illinois lake enhanced snow is possible during the event and lake effect snow is expected after the event ends. This is expected to lead to lake boosted snowfall accumulations across Northeast Illinois. Periods of moderate to heavy snow, with snowfall rates of 1-2" an hour, can be expected at times near the lake shore (Cook Co). What's Expected... Final snowfall totals upwards of 4-7" are expected across the southern half of the state, with locally higher amount possible. Across Central Illinois, snowfall totals will taper, with 1-5" being likely. Across Northeast Illinois where lake effect/enhancement is expected, snowfall totals of 4-9" are expected near the immediate lake shore (Cook Co), and 1-5" further inland. Below is the snowfall forecast for this event. 
JP
(11:45AM - 2/13/21) A winter storm is expected to affect the region Sunday through Tuesday, bringing waves of accumulating snow to portions of the state. Additionally, lake effect snow will be possible across Northeast Illinois.
Summary... A storm system is expected to affect the region Sunday through Tuesday, with an extended period featuring waves of accumulating snow for portions of the state. The storm system will eject out from the Gulf of Mexico and into the Southeastern US, Sunday and into Monday. The storm system will then move northeastward through the Mid-Atlantic on Tuesday. Model guidance continues to be in some disagreement regarding certain aspects of this event, thus we continue to take a middle ground solution with this forecast update.
Forecast...
A lengthy period featuring waves of accumulating snow will affect a large portion of the state, from Sunday morning through Tuesday morning. During this time snow will be of varying intensity, with a few breaks between periods/waves of snowfall being possible. Snow will be moderate to heavy at times, with snowfall rates in excess of 1" an hour at times. In addition to the synoptic snow, across Northeast Illinois lake enhanced snow is possible during the event and lake effect snow is possible after the event ends. This is expected to lead to snowfall accumulations across Northeast Illinois. What's Expected... Final snowfall totals upwards of 4-7" is expected across Southern Illinois, with amounts of 1-5" expected across Central and Northeast Illinois. Below is the snowfall forecast for this event. 
JP
(10:00PM - 2/12/21) A storm system is expected to affect the region Sunday through Tuesday, bringing waves of accumulating snow to portions of the state. Additionally, lake effect snow will be possible across Northeast Illinois.
Summary... A storm system is expected to affect the region Sunday through Tuesday, with an extended period featuring waves of accumulating snow for portions of the state. The storm system will eject out from the Gulf of Mexico and into the Southeastern US, Sunday and into Monday. The storm system will then move northeastward through the Mid-Atlantic on Tuesday. Model guidance has been showing the potential for this storm system for several days. After being in significant disagreement, the cone of uncertainty has narrowed with time...However, some disagreement regarding track/strength of the system and associated location/amounts of snowfall still exist.
Forecast...
A lengthy period featuring several waves of accumulating snow will affect a large portion of the state, from Sunday morning through Tuesday morning. During this time snow will be of varying intensity, with a few breaks between periods/waves of snowfall being possible. Snow will be moderate to heavy at times, with snowfall rates in excess of 1" an hour at times. In addition to the synoptic snow, across Northeast Illinois lake enhanced snow is possible during the event and lake effect snow is possible after the event ends. This is expected to lead to snowfall accumulations across Northeast Illinois.
What's Expected...
Final snowfall totals upwards of 4-7" is expected across Southern Illinois, with amounts of 1-5" expected across Central and Northeast Illinois. Below is the snowfall forecast for this event. 
JP
(11:45AM - 2/12/21) A storm system will move through the region today through Saturday, bringing another snow event to Northern and portions of Central Illinois.
Summary... A storm system will move through the region today through Saturday, bringing periods of snow and another snow event to Northern and portions of Central Illinois. Model guidance continues to be in good agreement regarding the track of the disturbance and location of the snowfall axis...However, over the past 12-24 hours there has been a drying trend in model guidance. Thus, we have cut expected snowfall totals down a bit for some areas with the forecast update last night and no with this new update.
Forecast...
Periods of snow will spread across Northern and portions Central Illinois, late this afternoon through Saturday evening. If some banding can develop, a few periods of moderate to heavy snow will be possible....Otherwise most of this event will feature light snow. What's Expected... Final snowfall totals upwards of 1-3" is expected across Northern Illinois, with a corridor of 2-5" totals expected in the vicinity of I-80. Snowfall amounts will taper with southward extent into Central Illinois. Below is the snowfall forecast for this event. 
JP
(10:00PM - 2/11/21) A storm system will move through the region on Friday and Saturday, bringing another snow event Northern and Central Illinois.
Summary... A storm system will move through the region Friday and Saturday, bringing periods of snow and another snow event to Northern and Central Illinois. Model guidance continues to be in fairly decent agreement with this event, with just some minor changes with time.
Forecast...
Periods of snow will spread across Northern and Central Illinois, early Friday afternoon through Saturday evening. Some periods of moderate to heavy snow will be possible at times during this period, especially if banding can develop. Across Northeast Illinois near Lake Michigan, some lake effect/enhancement to the snow is likely to occur. What's Expected... Final snowfall totals upwards of 2-5" are expected in corridor across portions of Northern Illinois, with amounts tapering with southward extent into Central Illinois. Below is the snowfall forecast for this event. 
JP
(11:30AM - 2/11/21) A storm system will move through the region on Friday and Saturday, bringing another snow event Northern and Central Illinois.
Summary... A storm system will move through the region Friday and Saturday, bringing periods of snow and another snow event to Northern and Central Illinois. Model guidance has been showing the potential for this event for the past several days. There had been a lot of disagreement, but that has narrowed with time, with now decent overall agreement regarding this event. With this update we have increased expected snowfall totals, as confidence increases.
Forecast...
Periods of snow will spread across Northern and Central Illinois, midday Friday through Saturday evening. Periods of moderate to heavy snow will be possible at times during this period. Across Northeast Illinois near Lake Michigan, some lake effect/enhancement to the snow is likely to occur. What's Expected... Final snowfall totals upwards of 2-5" are expected in corridor across portions of Northern Illinois, with amounts tapering with southward extent into Central Illinois. Below is the snowfall forecast for this event. 
JP
(10:00PM - 2/10/21) A storm system will move through the region on Friday and Saturday, bringing another snow event to portions of the state.
Summary... A storm system will move through the region Friday and Saturday, bringing periods of snow and another snow event to portions of the state. Model guidance has been showing the potential for this event for the past several days, with some disagreement regarding placement of the snowfall axis and snowfall amounts. With this first forecast we have taken the middle ground of model guidance.
Forecast...
Periods of snow will spread across portions of Northern and Central Illinois, late Friday morning through Saturday evening. Across Northeast Illinois near Lake Michigan, some lake effect/enhancement to the snow is likely to occur. What's Expected... Final snowfall totals upwards of 1-3" are expected in an axis across portions of Northern and Central Illinois, with locally higher amounts possible. Below is the snowfall forecast for this event. 
JP
(10:00PM - 2/10/21) A fast moving and weak disturbance will move through the region on Thursday, bringing another minor snowfall event to portions of the state.
Summary... A fast moving and weak disturbance will move through the region on Thursday, bringing periods of snow and another minor snowfall event to portions of the state. Model guidance continues to be in general agreement regarding this event...With little change needed for this forecast update other than to slightly increase snowfall amounts across portions of Northern Illinois, as confidence has grown.
Forecast...
Areas of snow and snow showers will spread across portions of Northern and Central Illinois, Thursday morning through early Friday morning. Due to the associated disturbance being fast moving, weak and moisture starved...This will remain a minor/nuisance event. Additionally, some lake enhanced and lake effect snow will be possible across Northeast Illinois near Lake Michigan, from Thursday morning through early Friday morning. What's Expected... Final snowfall totals upwards of 1-3" are possible across portions of Northern Illinois, with a dusting to 1" expected across other portions of the state. Below is the snowfall forecast for this event. 
JP
(11:45AM - 2/10/21) A fast moving and weak disturbance will move through the region on Thursday, bringing another minor snowfall event to portions of the state.
Summary... A fast moving and weak disturbance will move through the region on Thursday, bringing periods of snow and another minor snowfall event to portions of the state. Model guidance continues to be in general agreement regarding this event, with little change needed for this forecast update.
Forecast...
Areas of snow and snow showers will spread across much of Northern and Central Illinois, Thursday morning through early Friday morning. Due to the associated disturbance being fast moving, weak and moisture starved...This will remain a minor/nuisance event. What's Expected... Final snowfall totals upwards of 1-3" are possible across far Northwest Illinois, with a dusting to 1" expected across much of Northern and Central Illinois. Below is the snowfall forecast for this event. 
JP
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