AFTERNOON – OVERNIGHT: A frontal boundary continue to remain in place across the state this morning. In result, clouds and rain continue to stick around the forecast area.
Through the afternoon rainfall looks to continue across zones 6 and 7. However, an area of high pressure will be building in from the north, so rain will start to end from northwest to southeast. By 4-5 pm this evening rain looks to be ending across western zone 7 and northwest zone 6.
Rain will continue off to the regions east through the evening hours. By 8-9 PM most of the rain will be exiting the forecast zones with only a few isolated showers left.
Before the rain comes to a complete end some more heavy accumulations can be anticipated. Some places across zone across southern zone 6 could see another 1-1.5” through the day.
Overnight we will see dry conditions, but we will continue with mostly cloudy to completely overcast skies. That’s with the exception of portions of zone 7 where there may be enough dry air from the high pressure system to clear skies.
Lows overnight will be in the mid 30’s north to upper 40’s south.
FRIDAY: High pressure will be in control of the weather across the region on Friday. I think many places across zones 6 and 7 see mostly cloudy skies, some places across zone 7 could see more sunshine.
Friday will be a mostly dry day across Illinois with the exception of a few showers later on in the day across southern zone 6. By 8-10 PM Friday evening a few rain showers will be possible across southern Illinois.
Highs on Friday will be in the upper 50’s north to near 70 south.
Friday night a warm front will start to lift northward into southern portions of the forecast area. There will be enough isentropic lift along the front to create scattered areas of rain and some thunderstorms overnight.
These storms will work their way from south to north through the overnight. Models currently have the best chances for rain and storms around the I-70 area by 7-8 AM Saturday morning. While no strong or severe storms are forecast, I do think a couple of these thunderstorms could have some gusty winds as they pass through.
Lows overnight Friday into Saturday will be in the low 40’s north to mid 50’s south.
WEEKEND: Through the daytime hours on Saturday the warm front will continue lifting northward across zones 1 and 5. As it does the initial rain and thunderstorm chances will move off with it. By 12-1 PM models do show the better rain/storms chances being north of the forecast area.
Highs on Saturday will be in the mid 60’s north to mid 70’s south.
While the afternoon hours do look mostly dry across Illinois it does appear rain chances will start to increase by late afternoon into the evening. Especially across zone 6 where another surface boundary looks to be located. After 4-5 PM isolated to scattered rain and thunderstorms look possible across zone 6.
Overnight Saturday into Sunday scattered areas of rain will persist through the overnight across both zones 6 and 7.
Lows will be in the mid 50’s north to around 60 south.
Sunday a wave of low pressure will start to move across Illinois. This coupled with a couple of different frontal boundaries that could be in place will allow rain and t’storm chances to continue throughout the day on Sunday. While I don’t think Sunday will be a wash out, keeping an eye on the weather is definitely advisable if you have outdoor plans.
Sunday will be another very warm day across the region with highs in the low 60’s north to near 70 south.
MONDAY: An upper level trough will be moving to the south and southeast of the forecast area on Monday. Models are a little fuzzy on exactly where this energy will move and impact. The GFS takes the center of this trough farther south towards southern Tennessee, this would decrease our rain chances to start the week.
However, the EURO brings the trough farther north allowing for better chances of rain to continue for Monday. Regardless, I am not anticipating any all-day rain on Monday, just scattered areas.
Highs on Monday will be in the mid 60’s to low 70’s.
MID NEXT WEEK: A cold front will start to approach zones 6 and 7 through the daytime hours Tuesday. As it does rain and thunderstorm chances will increase across the region by late in the day on Tuesday. However, models are still struggling with developing much in the way of precipitation, I think largely because models show a lack of any deep moisture across the region.
However, instability and strong upper level winds are forecast to be in place the cold front moves through late in the afternoon/evening timeframe. With that in mind it’s something we will continue to monitor over the next several days.
Highs on Tuesday will be in the upper 60’s to mid 70’s.
7 DAY FORECAST
FRIDAY: SOME SUNSHINE NORTH, MOSTLY CLOUDY SOUTH. 10% CHANCE OF PM SHOWERS IN FAR SOUTHERN IN/IL. HIGHS IN THE UPPER 50’S NORTH TO MID 60’S SOUTH. WINDS FROM THE EAST AT 5-15 MPH.
FRIDAY NIGHT: MOSTLY CLOUDY WITH A 30% CHANCE OF RAIN AND T’STORMS. LOWS IN THE LOW 40’S NORTH TO MID 50’S SOUTH.
SATURDAY: MOSTLY CLOUDY WITH A 20-30% CHANCE OF RAIN & A T’STORM. HIGHS IN THE MID 60’S NORTH TO MID 70’S SOUTH. WINDS FROM THE SOUTHEAST AT 6-12 MPH.
SATURDAY NIGHT: CLOUDY WITH A 40% CHANCE OF RAIN. LOWS IN THE MID 50’S NORTH TO AROUND 60 SOUTH.
SUNDAY: MOSTLY CLOUDY WITH A 40% CHANCE OF RAIN AND T’STORMS POSSIBLE. HIGHS IN THE LOW 60’S NORTH TO AROUND 70 SOUTH. SOUTHERLY WINDS AT 6-12 MPH, GUSTING TO 20 MPH.
SUNDAY NIGHT: MOSTLY CLOUDY WITH A 20% CHANCE OF RAIN. LOWS IN THE LOW 50’S NORTH TO UPPER 50’S SOUTH.
MONDAY: PARTLY TO MOSTLY CLOUDY WITH A 20-30% CHANCE OF RAIN AND A FEW T’STORMS. HIGHS IN THE MID 60’S NORTH TO LOW 70’S SOUTH. SOUTHWEST TO WEST WINDS AT 5-10 MPH, GUSTING TO 20 MPH.
MONDAY NIGHT: PARTLY TO MOSTLY CLOUDY WITH A 20% CHANCE OF SHOWERS. LOWS IN THE LOW TO MID 50’S.
TUESDAY: PARTLY SUNNY TO MOSTLY COUDY, 30% CHANCE OF RAIN AND T’STORMS. HIGHS IN THE UPPER 60’S NORTH TO MID 70’S SOUTH.
TUESDAY NIGHT: PARTLY TO MOSTLY CLOUDY WITH A 30% CHANCE OF RAIN AND A FEW T’STORMS. LOWS IN THE UPPER 40’S TO UPPER 50’S.
WEDNESDAY: MIX OF CLOUDS AND SUN. 20% CHANCE OF RAIN. HIGHS IN THE UPPER 60’S TO UPPER 70’S.
WEDNESDAY NIGHT: CLOUDY WITH A CHANCE OF RAIN AND T’STORMS. LOWS IN THE UPPER 40’S TO UPPER 50’S.
THURSDAY: DECREASING CLOUDS WITH HIGHS IN THE MID 50’S TO MID 60’S.
THURSDAY NIGHT: PARTLY TO MOSTLY CLOUDY, INCREASING RAIN CHANCES SOUTH. LOWS IN THE 40’S.