AFTERNOON – OVERNIGHT: The area of high pressure that was in control of the weather to start the week continues to move off to the east. As it does, a warm front will continue lifting through Illinois today. With this front will come a southerly wind shift and warmer temperatures.
This afternoon there looks to be plenty of sunshine with highs topping out in the 60’s. However, by late afternoon into the evening clouds will start to increase from west to east across zones 6 and 7.
This evening into the overnight the warm front will lift into northern Illinois and perhaps southern Wisconsin. As it does mostly cloudy skies will move into place over the forecast zones. While rain won’t be a big concern overnight, I won’t totally rule out a stray shower. Overall, any shower that should develop will be light and short-lived in nature.
Lows overnight will be in the upper 40’s to low 50’s.
WEDNESDAY: On Wednesday the area of low pressure will remain to the west through the daytime hours. To our north a warm front will remain in place, keeping us in the warm sector of this storm system.
While mostly cloudy to completely overcast skies are likely through the day Wednesday, I think only isolated rain will be possible as the primary lifting mechanisms (low pressure, cold front, warm front) will be west and north of zones 6 and 7.
Despite cloud cover temperatures will be warm with highs in the low 60’s north to upper 60’s south. That will be thanks to a warm transport of air from the southerly winds. Those winds on Wednesday will be strong at times with gusts of 25-35 mph possible.
Wednesday night the low pressure and associated cold front will move eastward closer to the region. By 12-1 Am Thursday isolated to scattered rain and a few t’storms will be possible across western Illinois.
Through the overnight the cold front will move to the east into zones 6 and 7. As it does rain and thunderstorm chances will increase.
THURSDAY: By 7-8 AM Thursday morning the cold front will be in place across western Illinois and eastern Missouri. Ahead of the front scattered areas of rain and t’storms will be ongoing/developing.
Through the morning the cold front will move to the east, as it does rain and thunderstorm coverage will increase across both zones 6 and 7.
By late morning into the early afternoon rain and storms will progress to the east. By 10 AM – 12 PM Thursday afternoon the cold front and precipitation will be along the Illinois/Indiana state line, exiting out of the area to the east.
Highs on Thursday will come in the morning hours before the cold front passes. Temperatures in the morning will top out in the upper 40’s to upper 50’s before falling through the afternoon. Winds will be very strong on Thursday with gusts from 40-50 mph at times.
While I am not anticipating any widespread reports of strong/severe storms. There will be a little bit of instability with the cold front passage. That instability coupled with some strong upper level energy will likely prove enough to generate the potential for some gusty winds and small hail. So a couple stronger storms can’t be totally ruled out Thursday.
Once the front passes Thursday morning and afternoon, as mentioned, temperatures will drop quickly. Behind the front there will be some leftover moisture, so some snow showers will be possible across zone 7 and northern zone 6 Thursday afternoon and into the evening. No accumulation is anticipated.
Once all the precipitation moves out an average of .25-.50″ of new rain looks to fall across the forecast zones. However, places that do get under some of the heavier thunderstorms will see locally more. The Hi-Res NAM shows some 1 – 1.5″ rain totals locally, with better chances being south of I-70. This is also in forecast agreement with the EURO model.
Thursday night into Friday we will start to see at least some clearing take place from west to east across the forecast zones.
Lows Thursday night will fall into the upper 20’s to mid 30’s.
FRIDAY: An area of high pressure will build into the forecast area Thursday night into Friday. This will control the weather to end the week across the region.
With high pressure in control Friday will be sunny to mostly sunny across the region. However, temperatures will remain on the cool side with highs in the mid 40’s north to mid 50’s south.
WEEKEND: Saturday will prove to be the nicest day of the weekend. This as the area of high pressure moves to the west and a low develops to the east. While a few showers may be possible across western Illinois, overall I think conditions will be dry with plenty of sunshine.
Highs will top out in the mid 50’s north to mid 60’s south.
Sunday an area of low pressure will start to move into the forecast area. As it does clouds and precipitation will increase across the Midwest.
Highs on Sunday will be in the mid 50’s to mid 60’s.
7 DAY FORECAST
WEDNESDAY: MOSTLY CLOUDY WITH A 20% CHANCE OF RAIN & AN ISOLATED T’STORM. HIGHS IN THE LOW 60’S NORTH TO UPPER 60’S SOUTH. WINDS FROM THE SOUTHWEST AT 5-15 MPH, GUSTS FROM 25-35 MPH.
WEDNESDAY NIGHT: CLOUDY WITH A 30% CHANCE OF RAIN & A T’STORM. LOWS IN THE MID 40’S WEST TO MID 50’S EAST.
THURSDAY: CLOUDY WITH A 50% CHANCE OF RAIN & T’STORMS. HIGHS IN THE UPPER 40’S WEST TO AROUND 60 EAST. WINDS FROM THE SOUTH TO WEST AT 9-18 MPH, GUSTING TO 40-50 MPH.
THURSDAY NIGHT: TEMPERATURES FALL, PARTLY TO MOSTLY CLOUDY WITH A 20% CHANCE OF SNOW SHOWERS. LOWS IN THE UPPER 20’S NORTH TO MID 30’S SOUTH.
FRIDAY: MOSTLY SUNNY TO PARTLY CLOUDY, COOLER. HIGHS IN THE MID 40’S NORTH TO MID 50’S SOUTH. WINDS FROM THE NORTHEAST AT 6-12 MPH.
FRIDAY NIGHT: CLEAR TO MOSTLY CLEAR WITH LOWS IN THE UPPER 20’S NORTH TO UPPER 30’S SOUTH.
SATURDAY: SUNNY TO MOSTLY SUNNY, A STRAY SHOWER WEST. HIGHS IN THE MID 50’S NORTH TO MID 60’S SOUTH. WINDS FROM THE SOUTHEAST AT 6-12 MPH, GUSTS TO 20 MPH.
SATURDAY NIGHT: MOSTLY CLEAR TO PARTLY CLOUDY WITH A 10% CHANCE OF A SHOWER WEST. LOWS IN THE UPPER 30’S NORTHWEST TO UPPER 40’S SOUTH.
SUNDAY: PARTLY TO MOSTLY CLOUDY WITH A 20-30% CHANCE OF RAIN. HIGHS IN THE MID 50’S TO MID 60’S.
SUNDAY NIGHT: CLOUDY WITH A 40-50% CHANCE OF RAIN OR A RAIN/SNOW MIX. LOWS IN THE LOW 30’S NORTH TO AROUND 40 EAST.
MONDAY: PARTLY CLOUDY AND COOL, RAIN OR SNOW WEST? HIGHS IN THE LOW 40’S TO MID 50’S.
MONDAY NIGHT: MOSTLY TO PARTLY CLEAR, COLD. LOWS IN THE MID 20’S TO MID 30’S.
TUESDAY: PARTLY CLOUDY WITH HIGHS IN THE MID 30’S TO UPPER 40’S.
TUESDAY NIGHT: CLEAR AND COLD. LOWS IN THE UPPER 20’S TO MID 30’S.