(6:45PM - 6/29/20) A warm/hot, humid and at times stormy pattern is likely to continue deep into July across the region.
The past few days a new pattern has begun to set in across the country, and has increasing support to stay in place well into July, potentially even as we eventually push into mid-July. This pattern will feature a ridge across the Inter-Mountain West and Central US, with a trough across the far Northwest and far Northeast. 
This new pattern will allow warm/hot and humid conditions to the be norm across the state during this period. High temperatures the past few days, and for the foreseeable future, will be generally in the mid-80's to mid 90's across the state on a daily basis. Also, humid conditions are expected, with dew points likely to be in the upper 60's to upper 70's on a daily basis. The temperature and dew point combination will lead to high humidity and hit heat index values, likely reaching the mid 90's to mid 100's on several occasions. In addition to the heat and humidity, periods of stormy conditions will also be possible. The first stormy period kicked off this past weekend, and will likely continue into Wednesday. Beyond this time, any small/subtle waves that top the ridge in place or get trapped under the ridge, may provide stormy conditions at times. While no widespread severe t'storm or flooding activity is expected at this time, this deep summer pattern will support localized flooding during any stormy periods and a stray severe t'storm at times.
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(11:45AM - 6/27/20) Multiple disturbances moving through the region through today, will continue to bring a severe t'storm threat to portions of the state through tonight.
This afternoon - tonight... Weakening clusters of showers and t'storms have been ongoing this morning across Central and Southern Illinois, and adjacent states. Some of this activity has re-generated with some additional new scattered showers and t'storms having developed as well. Additional new scattered showers and t'storms are expected to develop across the state and adjacent states through the day. All of this activity, in the form of several clusters, will move across Central and Southern Illinois, this afternoon into tonight. The environment expected to be in place will feature low to moderate instability, good to great moisture, marginal shear and marginal forcing. This will lead to upwards of a minimal (level 1) severe t'storm risk across Central and Southern Illinois. Damaging winds and large hail will be the main threats, though an isolated tornado can't be ruled out.
Friday - Friday night recap...
Clusters of showers and t'storms spread across Northern Illinois, Friday morning into Friday afternoon. In the wake of this early activity, some clearing and destabilization occurred. New development of scattered showers and t'storms occurred Friday afternoon, across portions of Southern Wisconsin, Iowa and Northwest Illinois. This activity grew upscale into multiple lines/clusters, which pushed southeastward across Northern Illinois late Friday afternoon into Friday night. Scattered to numerous severe t'storms occurred with this activity, with damaging winds having been the main threat. This activity continued to spread across portions of Northern and Central Illinois in a weakening phase into Friday night. Below is the severe t'storm forecast for this afternoon - tonight. 
(12:00PM - 6/26/20) Multiple disturbances are expected to move through the region today and Saturday, bringing a severe t'storm threat to portions of the state each day.
Today - tonight recap... Clusters of showers and t'storms spread across Northern Illinois, this morning into this afternoon. In the wake of this early activity, some clearing and destabilization occurred. New development of scattered showers and t'storms occurred this afternoon, across portions of Southern Wisconsin, Iowa and Northwest Illinois. This activity grew upscale into multiple lines/clusters, which pushed southeastward across Northern Illinois late this afternoon into tonight. Scattered severe t'storms occurred with this activity, with damaging winds having been the main threat. This activity will continue to spread southeastward across portions of Northern and Central Illinois tonight. An isolated severe t'storm will be possible, with damaging winds being the main threat.
Saturday - Saturday night...
A complex situation is likely for Saturday... Weakening clusters of showers and t'storms will be ongoing Saturday morning across portions of Central and Southern Illinois, and adjacent states. Some of this activity may re-generate during the afternoon, with additional new scattered showers and t'storms likely to develop across Central and Southern Illinois, and adjacent states as well. This activity, in the form of several clusters, will then move across Central and Southern Illinois, Saturday afternoon into Saturday night. The environment expected to be in place will feature low instability, good moisture, decent shear and decent forcing. This will lead to upwards of a minimal (level 1) severe t'storm risk across Central and Southern Illinois. Damaging winds and large hail will be the main threats, though an isolated tornado can't be ruled out. Trends will continue to be monitored for the potential for an upgrade in severe t'storms probabilities in future updates. Below is the severe t'storm forecast for Saturday - Saturday night. 
(12:00PM - 6/26/20) Multiple disturbances are expected to move through the region today and Saturday, bringing a severe t'storm threat to portions of the state each day.
This afternoon - tonight... Clusters of showers and t'storms have been spreading across Northern and portions of Central Illinois this morning. In the wake of this early activity, some clearing and destabilization is expected to occur this afternoon. New development of scattered showers and t'storms will occur this afternoon, across portions of Southern Wisconsin, Iowa and Northwest Illinois. This activity is likely to grow upscale into multiple lines/clusters, pushing southeastward across Northern and eventually Central Illinois, this afternoon into tonight. The environment expected to be in place will feature moderate instability, good moisture, good shear and good forcing. This will lead to upwards of a limited (level 2) to elevated (level 3) severe t'storm risk across Northern and portions of Central Illinois. Damaging winds will be the greatest threat, though large hail and an isolated tornado can't be ruled out. Trends are being monitored for the potential for an upgrade in severe t'storms probabilities. Should this be needed, a special full update will be provided.
Saturday - Saturday night...
A complex situation is likely for Saturday... Weakening clusters of showers and t'storms will be ongoing Saturday morning across portions of Central and Southern Illinois, and adjacent states. Some of this activity may re-generate during the afternoon, with additional new scattered showers and t'storms likely to develop across Central and Southern Illinois, and adjacent states as well. This activity, in the form of several clusters, will then move across Central and Southern Illinois, Saturday afternoon into Saturday night. The environment expected to be in place will feature low instability, good moisture, decent shear and decent forcing. This will lead to upwards of a minimal (level 1) severe t'storm risk across Central and Southern Illinois. Damaging winds and large hail will be the main threats, though an isolated tornado can't be ruled out. Trends will continue to be monitored for the potential for an upgrade in severe t'storms probabilities in future updates. Below is the severe t'storm forecast for this afternoon - tonight and Saturday - Saturday night.
(9:45PM - 6/25/20) Multiple disturbances are expected to move through the region Friday and Saturday, bringing a severe t'storm threat to portions of the state each day.
Synopsis... Isolated to scattered showers and t'storms will likely develop and move across portions of Northern and Central Illinois Friday morning, along a warm front quickly advancing across the state. In the wake of this early activity, some clearing and destabilization will likely occur. Re-generation and new development of scattered showers and t'storms will occur Friday afternoon, across portions of Wisconsin, Iowa and Northwest Illinois. This activity is likely to grow upscale into one or more lines/clusters, pushing southeastward across Northern and eventually Central Illinois, Friday afternoon into Friday night. The environment expected to be in place will feature moderate instability, good moisture, good shear and good forcing. This will lead to upwards of a limited (level 2) to elevated (level 3) severe t'storm risk across Northern and Central Illinois. Damaging winds will be the greatest threat, though large hail and an isolated tornado can't be ruled out. A low end severe t'storm threat will likely exist in some capacity across Central and Southern Illinois for Saturday. This will be discussed more in future updates. Below is the severe t'storm forecast for Friday - Friday night. 
(11:45AM - 6/25/20) A storm system is expected to move through the region Friday and Saturday, bringing a severe t'storm threat to portions of the state each day.
Synopsis... Isolated to scattered showers and t'storms will likely develop and move across portions of Northern and Central Illinois Friday morning, along a warm front quickly advancing across the state. In the wake of this early activity, clearing and destabilization will likely occur. New development of scattered showers and t'storms will occur Friday afternoon, across portions of Wisconsin, Iowa and Northwest Illinois. This activity is likely to grow upscale into one or more lines, pushing southeastward across Northern and Central Illinois, Friday afternoon into Friday night. The environment expected to be in place will feature moderate instability, good moisture, good shear and good forcing. This will lead to upwards of a limited (level 2) to elevated (level 3)severe t'storm risk across Northern and Central Illinois. Large hail and damaging winds being the main threats. A severe t'storm threat will likely exist in some capacity across Central and Southern Illinois for Saturday. This will be discussed more in future updates. Below is the severe t'storm forecast for Friday - Friday night. 
(9:30PM - 6/24/20) A storm system is expected to move through the region Friday and Saturday, bringing a severe t'storm threat to portions of the state each day.
Synopsis... Isolated to scattered showers and t'storms will likely develop and move across portions of Northern and Central Illinois Friday morning, along a warm front quickly advancing across the state. In the wake of this early activity, clearing and destabilization will likely occur. New development of scattered showers and t'storms will occur Friday afternoon, across portions of Wisconsin, Iowa and Northwest Illinois. This activity is like to grow upscale into one or more lines, pushing southeastward across Northern and Central Illinois, Friday afternoon into Friday night. The environment expected to be in place will feature moderate instability, good moisture, good shear and good forcing. This will lead to upwards of a limited (level 2) severe t'storm risk across Northern and Central Illinois. Large hail and damaging winds being the main threats. Trends will continue to be monitored for the potential for an upgrade in severe t'storms probabilities in future updates. A severe t'storm threat will likely exist in some capacity across Central and Southern Illinois for Saturday. This will be discussed more in future updates. Below is the severe t'storm forecast for Friday - Friday night. 
(11:45AM - 6/22/20) Several disturbances moving through the region will bring the chance for severe t'storms to the state, through tonight.
Synopsis... Several disturbances moving through the region today will bring a low end severe t'storm threat to the state, through tonight. Isolated to scattered showers and t'storms have been ongoing this morning across portions of Northern, Western and Southern Illinois...associated with a lead disturbance moving through. Some of this activity will persist into the afternoon, with intensification likely, especially across Southern and Eastern Illinois. Additionally, new scattered showers and t'storms will develop across the state and surrounding states during the afternoon, as the next disturbance moves. Both previous re-generated morning activity and new afternoon development will push eastward across much of the state in the form of several clusters/lines, from this afternoon into early tonight. The environment expected to be in place will feature low to moderate instability, decent to good moisture, decent shear and decent forcing. This will lead to a low end severe t'storm threat across the state, with a minimal (level 1) severe t'storm risk expected. Large hail and damaging winds being the main threats. Trends will continue to be monitored for the potential for a more concentrated area and/or increased overall severe t'storm potential for portions of the state. Should one or both of these become more likely, an upgrade in severe t'storm risk may be needed in a future update. Below is the severe t'storm forecast for this event. 
(9:00PM - 6/21/20) A storm system moving through the region will bring the chance for severe t'storms to the state on Monday.
Synopsis... A storm system and several disturbances are expected to move through the region on Monday. Isolated to scattered showers and t'storms will likely be ongoing across portions of Northern and Western Illinois, Monday morning. Some of this activity may persist into the afternoon across portions these areas, with the potential for re-intensification. Additionally, new scattered showers and t'storms will develop across the state and surrounding states during the afternoon, as several disturbances move through the region. Both previous re-generated morning activity and new afternoon development will push eastward across much of the state in the form of several clusters/lines, Monday afternoon through early Monday night. The environment expected to be in place will feature low instability, decent moisture, decent shear and decent forcing. This will lead to a low end severe t'storm threat across the state, with a minimal (level 1) severe t'storm risk expected. Large hail and damaging winds being the main threats. Trends are being monitored for the potential for a more concentrated area and/or increased overall severe t'storm potential for portions of the state. Should one or both of these become more likely, an upgrade in severe t'storm risk may be needed in a future update. Below is the severe t'storm forecast for this event. 
(11:30AM - 6/21/20) A storm system moving through the region will bring the chance for severe t'storms to the state on Monday.
Synopsis... A storm system and several disturbances are expected to move through the region on Monday. Isolated to scattered showers and t'storms will likely be ongoing or move into portions of the state, Monday morning. Some of this activity may persist into the afternoon across portions of the state, with the potential for re-intensification. Additionally, new scattered showers and t'storms will develop during the afternoon, as several disturbances move through the region. Both previous re-generated morning activity and new afternoon development will push across much of the state in the form of several clusters/lines, Monday afternoon through early Monday night. The environment expected to be in place will feature low instability, decent moisture, decent shear and decent forcing. This will lead to a low end severe t'storm threat across the state, with a minimal (level 1) severe t'storm risk expected. Large hail and damaging winds being the main threats. Below is the severe t'storm forecast for this event. 
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