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(10:30PM - 1/24/20) A brief update regarding the wither storm that continues across the state tonight...
A large are of precipitation changed from rain to snow across Northern Illinois this evening. Light to moderate snow is now ongoing for most affected areas, with upwards of a dusting to 2" of snow accumulation so far tonight for many areas. This area of snow is expected to pivot through Northern Illinois over night, and into Saturday morning. Additional snowfall accumulation of up to a few to a couple of inches in likely during that time. Final snowfall totals from tonight/tomorrow alone will be 2-5", which when combined with the 1-2" that occurred Wed-Thur, with make for final storm snowfall totals of 3-6"...with locally higher amounts possible. 
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(7:00AM - 1/24/20) What seems to be a never ending pattern we are stuck in recently, yet another late week/weekend winter storm is affecting state, and will continue to through Saturday. This storm system will be of long duration, with light to moderate accumulations of wintry precipitation are likely across a large portion of the state.
Synopsis...
A complex setup has been unfolding across the region, and will continue to into the weekend. Several upper air disturbances moving through the region will interact with each other during this time. The result has been the development of a storm system, which is looping through the region. During this period, an extended period of precipitation is likely across the state, through Saturday. Wintry precipitation will be favored for much of Northern and Central Illinois for most of this period, with rain more likely across Eastern and Southern Illinois. Observations continue to support the going forecast.
Wednesday afternoon-Thursday afternoon...
An initial area of snow moved across much of Northern and Central Illinois, Wednesday evening into Thursday afternoon. Upwards of a dusting to 2" of snow occurred across much of Northern and Central Illinois during this time. Thursday afternoon-Friday morning... A renewed push of precipitation spread across the state Thursday afternoon and evening, and continues this morning. Precipitation has been predominately snow across Northwest, Western and Southwest Illinois...With mostly rain across Northeast, Eastern and Southwest Illinois. Upwards of 1-3” occurred during this time across Southwest, Western and Northwest Illinois...with amounts hampering to a dusting east of these areas.
Friday morning-Friday evening...
While light snow showers and flurries will be possible across Northwest, Western and Southwest Illinois, light rain showers and drizzle will be possible across Northeast, Eastern and Southwest Illinois. Friday evening-Saturday afternoon... Yet another renewed push of precipitation is likely to wrap into Northern an portions of Central Illinois Friday evening through Saturday afternoon. This activity may start as a bit of rain, before changing over to snow. A period of moderate to heavy snow will be possible during this time, especially across Northeast Illinois. Snowfall accumulations of 2-5" will be likely across portions of Northern Illinois during this time, tapering to a dusting to 2" across Central Illinois. Below is a map featuring estimated times precipitation will be ending on Saturday. This visual representations will be much better than several sentences of text, which gets confusing. 
Final snowfall totals are expected in the 3-6" range across much of Northern and Central Illinois, with amounts tapering south and east from there. Locally higher amounts of snow will be possible across Northern Illinois. Minor sleet/ice accumulations will be possible as well, across Central and Southern Illinois.
Below is our TAM snowfall forecast for this event. 
(9:00PM - 1/23/20) What seems to be a never ending pattern we are stuck in recently, yet another late week/weekend winter storm is affecting state, and will continue to through Saturday. This storm system will be of long duration, with light to moderate accumulations of wintry precipitation are likely across a large portion of the state.
Synopsis...
A complex setup has been unfolding across the region, and will continue to into the weekend. Several upper air disturbances moving through the region will interact with each other during this time. The result has been the development of a storm system, which is starting to loop through the region. During this period, an extended period of precipitation is likely across the state, through Saturday. Wintry precipitation will be favored for much of Northern and Central Illinois for most of this period, with rain more likely across Eastern and Southern Illinois. Model guidance continues to be in fairly good agreement regarding this period, with observations supporting. No real change is needed this update, other then to mentioned the possibility of localized higher snowfall amounts being possible across Northern Illinois, as confidence continues to grow.
Wednesday afternoon-Thursday afternoon...
An initial area of snow moved across much of Northern and Central Illinois, Wednesday evening into Thursday afternoon. Upwards of a dusting to 2" of snow occurred across much of Northern and Central Illinois during this time. Thursday afternoon-Friday morning... A renewed push of precipitation has spread across the state this afternoon and evening. Precipitation has been predominately snow across Northern, Western and Southwest Illinois...With mostly rain across Eastern and Southwest Illinois. Precipitation will continue to move across the state overnight and into Friday morning. Snow will continue to be the main precipitation type across Northwest, Western and Southwest Illinois. Across Northeast Illinois, snow will eventually range to a mix or rain late tonight or early Friday morning. Rain continue to be the main precipitation type across Eastern and Southwest Illinois. Upwards of a dusting to 3" of snow will be likely during this time across Northern, Western and Southwest Illinois, with locally higher amounts possible in Western Illinois.
Friday morning-Friday evening...
While light snow showers and flurries will be possible across Northwest, Western and Southwest Illinois, light rain showers and drizzle will be possible across Northeast, Eastern and Southwest Illinois. Friday evening-Saturday afternoon... Yet another renewed push of precipitation is likely to wrap into Northern an portions of Central Illinois Friday evening through Saturday afternoon. This activity may start as a bit of rain, before changing over to snow. A period of moderate to heavy snow will be possible during this time, especially across Northeast Illinois. Snowfall accumulations of 2-5" will be likely across portions of Northern Illinois during this time, tapering to a dusting to 2" across Central Illinois. Below is a map featuring estimated times precipitation will be ending on Saturday. This visual representations will be much better than several sentences of text, which gets confusing.
Final snowfall totals are expected in the 3-6" range across much of Northern and Central Illinois, with amounts tapering south and east from there. Locally higher amounts of snow will be possible across Northern Illinois. Minor sleet/ice accumulations will be possible as well, across Central and Southern Illinois. Final snowfall totals will include several periods of snow over the multi-day period. It should be noted that given marginal surface temperatures during this period, there will be a constant/slow melting of snow. So what is on the ground after the event ends, will end up being less that what falls/accumulates during the event.
Below is our TAM snowfall forecast for this event. 
(7:00AM - 1/23/20) What seems to be a never ending pattern we are stuck in recently, yet another late week/weekend winter storm will affect the state, through Saturday. This storm system will be of long duration, with light to moderate accumulations of wintry precipitation are likely across a large portion of the state.
Synopsis...
A complex setup is unfolding across the region, from now on into the weekend. Several upper air disturbances moving through the region will interact with each other during this time. The result will be the development of a storm system, which will loop through the region. During this period, an extended period of precipitation is likely across the state, through Saturday. Wintry precipitation will be favored for much of Northern and Central Illinois for most of this period, with rain and a mix more likely across Eastern and Southern Illinois. Model guidance continues to be in fairly good agreement regarding this period, with early observations supporting. No real change is needed this update.
A large area of snow is ongoing over much of Northern and Central Illinois this morning, with mixed precipitation and rain across Southern Illinois. Upwards of a dusting to 2" of snow has occurred across Northern and Central Illinois thus far. Precipitation is expected to continue across much of the state from this point right on into Saturday, before slowly ending. Much of Northern and Central Illinois has a good shot at seeing most of the precipitation during this period fall as snow, with only short periods of mixed precipitation or rain expected. Across Eastern and Southern Illinois, much of the precipitation will fall as a mix of precipitation and rain.
Below are maps featuring estimated times precipitation will be ending on Saturday. These visual representations will be much better than several sentences of text, which gets confusing. 
Final snowfall totals are expected in the 3-6" range across most of Northern and Central Illinois, with amounts tapering south and east from there. Minor sleet/ice accumulations will be possible as well, across Central and Southern Illinois.
Below is our TAM snowfall forecast for this event. 
(9:00PM - 1/22/20) What seems to be a never ending pattern we are stuck in recently, yet another late week/weekend winter storm will affect the state, from today through Saturday. This storm system will be of long duration, with light to moderate accumulations of wintry precipitation are likely across a large portion of the state.
Synopsis...
A complex setup is beginning to unfold across the region, from now on into the weekend. Several upper air disturbances moving through the region will interact with each other during this time. The result will be the development of a storm system, which will loop through the region. During this period, an extended period of precipitation is likely across the state, from today through Saturday. Snow will be favored for much of Northern and Central Illinois for most of this period, with rain and a mix more likely across Eastern and Southern Illinois. Model guidance continues to be in fairly good agreement regarding this period.
Snow and mixed precipitation has started to push into Northwest, Western and Southwest Illinois this evening. This activity is expected to slowly expand across the rest of the state tonight and into Thursday morning. Precipitation will then continue across much of the state from this point right on into Saturday, before slowly ending Saturday afternoon. Much of Northern and Central Illinois has a good shot at seeing most of the precipitation during this period fall as snow, with only short periods of mixed precipitation or rain expected. Across Eastern and Southern Illinois, much of the precipitation will fall as a mix of precipitation and rain. The most noteworthy part of this system will likely be Friday morning through Saturday afternoon, when periods of moderate to possibly heavy snow will be possible across portions of Northern and Central Illinois.
Below are maps featuring estimated start times of precipitation tonight, and then estimated times precipitation ending on Saturday. These visual representations will be much better than several sentences of text, which gets confusing.
Final snowfall totals are expected in the 3-6" range across most of Northern and Central Illinois, with amounts tapering south and east from there. It should be mentioned that marginal surface temperatures combined with the prolonged nature of the snow, will likely keep accumulations in check, and lower than what the could have been in a normal winter setup. Minor sleet/ice accumulations will be possible as well, across Central and Southern Illinois.
Below is our TAM snowfall forecast for this event. 
(9:00PM - 1/21/20) What seems to be a never ending pattern we are stuck in recently, yet another late week/weekend winter storm will affect the state, from Wednesday through Saturday. This storm system will be of long duration, with light to moderate accumulations of wintry precipitation are likely across a large portion of the state.
Synopsis...
A complex setup is expected to unfold across the region the middle of this week on into the weekend. Several upper air disturbances moving through the region will interact with each other during this time. The result will be the development of a storm system, which will loop through the region. During this period, an extended period of precipitation is likely across the state from Wednesday through Saturday. Wintry precipitation will be favored for much of Northern and Central Illinois for most of this period, with rain and a mix more likely across Eastern and Southern Illinois. Even with the complex nature of this period, model guidance is in decent agreement regarding this event. It should be noted that temperature profiles will be marginal most of this time during this period, and is of concern. Thus, for now we will continue hold of the side of caution, and go on the lower end of guidance regarding wintry precipitation amounts.
Snow, perhaps with some mixed precipitation, will first move into Northwest and Western Illinois by midday Wednesday. This activity will then slowly expand across the rest of the state Wednesday night and Thursday morning. Precipitation will then continue across much of the state from this point right on into Saturday, before slowly ending Saturday afternoon. Precipitation will be generally on the light side much of this period. However, more organized and moderate to heavy snow may be possible across portions of Northern and central Illinois, Friday into Saturday. Much of Northern and Central Illinois has a good shot at seeing most of the precipitation during this period fall as snow, with only small periods of mix/rain being possible. Across Eastern and Southern Illinois, much of the precipitation will fall as rain and a mix of precipitation.
Below are maps featuring estimated start times of precipitation Wednesday/Wednesday night. These visual representations will be much better than several sentences of text, which gets confusing.
Final snowfall totals are expected to be widespread in the 1-3" range across much of Northern and Central Illinois, with higher amounts in excess of 3" expected across Northwest and Western Illinois. Again, will stress for now that we are holding on the side of caution, and going on the lower end of model guidance on snowfall amounts.
Below is our TAM snowfall forecast for this event. 
(7:15AM - 1/21/20) What seems to be a never ending pattern we are stuck in recently, yet another late week/weekend winter storm will affect the state, from Wednesday through Saturday. This storm system will be of long duration, bringing with it a wide range of precipitation types across the state...Including snow, sleet, ice and rain. Light to moderate accumulations of wintry precipitation are likely across at least portions of the state.
Synopsis...
A complex setup is expected to unfold across the region this later this week on into the weekend. Several upper air disturbances entering the region will interact with each other during this time. The result will be the development of a storm system, which will push northeastward across the region. During this period, an extended period of precipitation is likely across the state from Wednesday through Saturday. Wintry precipitation will be favored for most areas during most of this period. Even with the complex nature of this period, model guidance is in decent agreement regarding the period. However, it should be noted that temperature profiles will be marginal most of this time period, and is of concern. Thus, for now we will hold of the side of caution, and go on the lower end of guidance regarding wintry precipitation amounts. Snow, perhaps with some mixed precipitation, will first push into Northwest and Western Illinois by Wednesday afternoon. This activity will then slowly expand across the rest of the state by Thursday morning. Precipitation will then continue across much of the state from this point right on into Saturday, before slowly ending. Much of Northern and Central Illinois has a good shot at seeing most of the precipitation during this period fall as snow, with only small periods of mix/rain being possible. Across Southern Illinois, much of the precipitation will fall as rain and a mix of precipitation.
Final snowfall totals are expected to be widespread in the 1-3" range across much of Northern and Central Illinois, with higher amounts in excess of 3" expected towards the Illinois/Iowa border. Again, will stress for now that we are holding on the side of caution, and going on the lower end of model guidance on snowfall amounts.
Below is our TAM snowfall forecast for this event. 
(2:00PM - 11/2/19) Post storm wrap up regarding the recent Fri-Sat, January 17-18th winter storm that affected the state. During this period nearly every weather hazard occurred across the state...rain, flooding, high winds, snow, sleet and ice.
A mash-up of several precipitation types occurred across much of the state during this period. Across Northern Illinois...Precipitation started as snow Friday afternoon and continued for a several hour period into Friday evening, before transitioning to a brief mix and then freezing rain for a couple hour period Friday night. Precipitation then transitioned to rain very late Friday night/very early Saturday morning for a period, before transitioning back to a brief mix/snow and then ending. Across Central Illinois...Precipitation started as a brief mix Friday afternoon, before transitioning to a several hour period of freezing rain into Friday evening. Precipitation then transitioned to rain Friday evening, continuing into Friday night, before ending. Across Southern Illinois...Precipitation started as a brief mix Friday afternoon, before quickly changing to rain, and continuing through Friday night, before ending Saturday morning.
Final storm snow/sleet totals of 2-6" occurred across Northern Illinois, with tapering amounts of a dusting to 3" across Central Illinois. Ice accumulation of 0.05-0.25" were common across a good portion of Northern and Central Illinois. Widespread precipitation/rain totals of 1-2.50" occurred across much of Central and Southern Illinois, which lead to some low end flooding for some areas.
Below is a map representation of final snow and rain totals across the state and adjacent areas. 
(8:15PM - 1/19/20) A period of lake effect snow will have the potential to affect portions of Northeast Illinois near Lake Michigan, through Monday afternoon.
As winds have backed more northerly today across Lake Michigan, lake effect snow has swung southward from Michigan into Indiana. As this northerly flow sets in for a period of time, some of the lake effect snow is likely to affect portions of Northeast Illinois, near Lake Michigan, through Monday afternoon. Lake effect snow showers have already occurred across portions of Northeast Illinois this afternoon and evening, with additional lake effect snow showers likely tonight through Monday afternoon, which is when more concentrated activity is possible. Snowfall amounts will generally be on the light side, ranging from a dusting across portions of Lake County (IL), to a dusting to 2" or so across portions of Cook County. Slight changes in wind direction could lead to changes in snowfall accumulations, which will be closely monitored for future updates. Below is the TAM snowfall forecast for this event. 
(12:30PM - 1/19/20) A period of lake effect snow will have the potential to affect portions of Northeast Illinois near Lake Michigan, from this afternoon through Monday afternoon.
As winds back more northerly, lake effect snow that has been affecting Michigan has started to swing southward towards Indiana. As this northerly flow sets in for a time, some of the lake effect is likely to affect portions of Northeast Illinois, near Lake Michigan, this afternoon through Monday afternoon. Snowfall amounts will generally be on the light side, ranging from a dusting across portions of Lake County, to a dusting to 2" or so across portions of Cook County. Slight changes in wind direction could lead to changes in snowfall accumulations, which will be closely monitored for future updates. Below is the TAM snowfall forecast for this event. 
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