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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. 
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(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. 
(9:00PM - 1/17/20) A brief short term update regarding the ongoing winter storm across the state...
Across Northern Illinois, an area of snow has been steadily transitioning to sleet and freezing rain. This transition has already occurred across Northwest Illinois, and will be occur across Northeast Illinois in the next few hours. Snowfall totals across Northern Illinois of 2-6" will have occurred by the time this transition is complete. A coating of sleet and 0.05-0.20" freezing rain accumulation will be likely tonight across Northern Illinois. Across Central Illinois, a mix of precipitation has transitioned to freezing rain, with 0.05-0.20" of ice accumulation having occurred...along with minor snow/sleet accumulation. Freezing rain will transition to rain across Central Illinois in the next couple to several hours. 
(4:45PM - 1/17/20) A brief short term update regarding the ongoing winter storm across the state...
As expected, a large area of precipitation has overspread much of the state this afternoon. At this time, an area of moderate to heavy snow is ongoing across all of Northern Illinois. Snowfall accumulations of a dusting to 2" have already occurred across this area. Snow is expected to continue for a couple to several more hours, before eventually transitioning to sleet and freezing rain. Further south, a mix of snow/sleet/freezing rain is ongoing across Central Illinois. Minor snow/sleet and ice accumulation has already occurred for many areas. With time, precip with change to all freezing rain, before changing to rain later tonight. 
(2:00PM - 1/17/20) A storm system will move through the region today through Saturday, 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 a large portion of the state. Additionally, high winds will be of a concern as well tonight through Saturday, along with a low flood threat across the heart of the state.
Synopsis...
A storm system cutting generally west to east across the Midwest is underway, with accumulating snow/sleet/ice occurring and expected across a large portion of the region. **As was mentioned in previous updates, model guidance has trended a higher with snow and ice accumulations across portions of the state the past few cycles, namely across Northern Illinois. After watching the storm system unfold across states to the west this morning and early afternoon with real-time data/observations, have indeed elected to raise snow/sleet and ice accumulations a bit from our previous updates, once again namely across Northern Illinois. We are not going as high as some model guidance would suggest, holding on the side of caution towards the lower end of guidance...due to some continued concern over how quickly a change over in precipitation types occurs. Will continue to monitor real-time data/observations should any significant changes look needed, otherwise it will be short term/impact updates from here on out for the duration of the event.**
This morning-tonight...
Precipitation has entered Northwest and Western Illinois as snow early this afternoon, with a mix of snow/sleet/freezing rain entering Southwest Illinois. Precipitation is expected to steadily overspread the rest of the state the next several hours. A several hour period of snow to sleet to freezing rain will occur across much of the state, with the exception being Southern Illinois, which may see mostly rain. This wintry mix will continue through this afternoon and into this evening across a good portion of the state, before precipitation transitions to rain from south to north across the state tonight. Snow/sleet accumulation during this period will range from 2-6" across Northern Illinois and a dusting to 3" across portions of Central Illinois. Ice accumulation of 0.10-0.25"+ is likely across a good portion of the heart of the state. Friday night-Saturday afternoon... A wintry mix of snow/sleet/freezing rain will transition to rain across Central Illinois earl to mid tonight, with the wintry mix expected to continue across Northern Illinois well into the night. By very late tonight and early Saturday morning, precipitation will have fully changed over to rain across just about the entire state, the exception being far Northern Illinois. Rain will then continue into Saturday afternoon across Central and Southern Illinois, before ending from west to east across the state. The exception will be across Northern Illinois, where rain will change back over to snow by mid Saturday morning, continuing into the afternoon, before coming to an end. Additional snows/sleet accumulation of a dusting to 2" and ice accumulation of a glaze to 0.20" will be possible across Northern Illinois during this time. It should be noted that a period of high winds is likely across the state from tonight through early Saturday night. Wind gusts across the state during this time will likely be in the 25-50MPH range. Below are maps featuring estimated start times of wintry precipitation today, and then estimated times of the change-over to rain tonight. These visual representations will be much better than several sentences of text, which gets confusing.
Final snow/sleet totals over much of Northern Illinois will range from 2-6", with locally higher amounts possible. Snow/sleet totals of a dusting to 3" will be likely across Central Illinois. Ice totals will likely range from 0.15-0.30"+" across much of the heart of the state, though locally higher amounts possible within this axis. The combination of snow/ice/high winds may lead to some power outages and tree damage across portions of Northern and Central Illinois. Additionally, precipitation totals of liquid value of 1-2"+ are likely up through the heat of the state. These high precipitation totals, combined with the heavy rainfall from the storm system last weekend, will lead to a low end flood threat.
Below are the TAM snow/sleet, ice, high wind and flood forecasts for this event.
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