AFTERNOON – OVERNIGHT: The area of low pressure across the northern Great Lakes region is continuing to occlude and weaken today. As it does it will move to the east and northeast allowing for an area of high pressure to build in and take its place.
Through the day the high pressure system will continue to build in so I do expect sunshine. However, aloft there will be a little piece of upper level energy that will move through zones 6 and 7. While the atmosphere is very dry some afternoon and evening clouds will be likely, along with a few isolated rain showers.
Winds through most of the day will be between 5-15 mph. However, by late into the evening winds will start to pick up. At this time gusts up to 30 mph will become possible.
Overnight we will remain with dry conditions across the forecast area. Lows will fall into the mid 30’s to low 40’s.
FRIDAY: Through the day on Friday the low pressure will move off to the east and a cold front will start to push southward across zones 6 and 7.
While there will be a front in place and an upper level trough approaching from the northwest, I still think there will be very little precipitation chances tomorrow. Models would suggest no rain, however, with the front and upper level energy coming in, I will leave in a slight chance for an isolated shower. Overall, no significant or soaking rains are forecast.
As the front passes to the south and winds shift cold air will quickly move in. Highs on Friday will be cooler, topping out in the mid 40’s to mid 50’s.
FRIDAY NIGHT – WEEKEND: Friday evening into the overnight an upper level trough of low pressure will drop into the forecast area. As it does rain and perhaps even some snow/mix will be possible across the forecast area.
By 7-8 PM Friday evening some isolated to scattered areas of rain will be possible across western Illinois and zone 7.
However, after 1-2 Am better chances for some scattered areas of rain will work across Illinois. Especially from the I-70 areas and points southward into zone 6.
Through the overnight scattered areas of rain will continue. With lows overnight Friday into Saturday dropping into the low to mid 30’s it isn’t out of the question that rain across northern zone 6 and into zone 7 could change over to a rain/snow mix or possibly all snow before sunrise Saturday.
However, with ground temperatures above freezing and air temperatures right at to just above 32, no accumulation is forecast to occur.
Through the day on Saturday a broad upper-level low will continue spinning across the Midwest. As it does it will keep isolated to scattered chances of rain in the forecast for most of the day.
Initially around 6-8 AM Saturday morning a rain/snow mix or possibly all snow will be possible north, as previously mentioned. However, once the sun rises temperatures will rebound taking us far enough above freezing that any snow will transition back to rain.
Through the day on Saturday isolated to scattered areas of rain will remain possible across zones 6 and 7. While it will not be a wash out by any means those will remain in the forecast.
Overall though the day rain looks to be light with only .10-.20” of rainfall expected through Saturday evening.
Highs on Saturday will remain cool only reaching into the mid 40’s north to mid 50’s south.
Saturday night isolated to scattered areas of rain will continue across the zone forecast area. Some of these could produce some more moderate periods of rainfall at times.
This will be thanks to the upper-level low moving into the region and starting to strengthen some. As it does upper-level vorticity will advect in. Where this does occur it will enhance rainfall intensity locally. Therefore, resulting in locally higher rainfall totals.
The NAM through Sunday morning does well picking this up. It shows some local areas getting .50-.80” of rain. This will most only see .10 -.30” of new rainfall.
While precipitation to the south does look to be mostly rain overnight. Temperatures will once again be cold enough for rain to change over to or mix with snow between 4-8 AM. The best chances at seeing some of those flakes will be across zone 7 and northern zone 6.
Lows overnight will be in the mid 20’s to mid 30’s.
Sunday morning isolated to scattered areas of rain/snow will continue, especially across zone 6.
However, as the trough moves off to the east of the forecast area Sunday rain chances will diminish from north to south through the day.
Highs on Sunday will be in the low 40’s to low 50’s.
MONDAY: An strong 1024 mb area of high pressure will build into the forecast regions Sunday night into Monday. This will allow for a mix of sun and clouds on Monday with no rainfall forecast.
However, temperatures to start the week will remain cool. Highs will top out in the low 40’s north to mid 50’s south.
NEXT WEEK: Another area of low pressure will develop out across the Great Plains Monday into Tuesday. As it does the high will move off to the east. This will allow a strong warm front to move into the region Monday night and Tuesday.
In result, temperatures will once again become unseasonably warm with highs back in the 60’s to near 70.
However, by Wednesday and especially Thursday, rain and t’storms will enter back into the forecast across the forecast zones.
7 DAY FORECAST
FRIDAY: PARTLY CLOUDY, WITH A 10% CHANCE OF SHOWERS WEST. HIGHS IN THE MID 40’S NORTH TO MID 50’S SOUTH. WEST TO NORTHWEST WINDS AT 6-12 MPH, GUSTING TO 25 MPH.
FRIDAY NIGHT: MOSTLY CLOUDY 30% CHANCE OF RAIN MIXING WITH SOME SNOW. LOWS IN THE UPPER 20’S NORTH TO UPPER 30’S SOUTH.
SATURDAY: PARTLY TO MOSTLY CLOUDY, AM SNOW SHOWERS TO RAIN. 30% CHANCE OF PRECIPITATION. HIGHS IN THE MID 40’S NORTH TO MID 50’S SOUTH. NORTHEAST WINDS AT 5-15 MPH.
SATURDAY NIGHT: MOSTLY CLOUDY, 20% CHANCE OF SNOW SHOWERS, ESPECIALLY WEST. LOWS IN THE MID 20’S NORTH TO MID 30’S SOUTH.
SUNDAY: MIX OF SUN AND CLOUDS, 20% CHANCE OF EARLY MORNING RAIN/SNOW SHOWER, THEN CHANGING TO RAIN. HIGHS IN THE MID 40’S NORTH TO LOW 50’S SOUTH. NORTHWEST WINDS AT 5-15 MPH, GUSTING TO 30 MPH.
SUNDAY NIGHT: PARTLY CLOUDY WITH LOWS IN THE UPPER 20’S NORTH TO MID 30’S SOUTH.
MONDAY: MIX OF CLOUDS AND SUN WITH HIGHS IN THE LOW 40’S NORTH TO MID 50’S SOUTH. NORTHWESTERLY WINDS AT 5-15 MPH, GUSTING FROM 25-35 MPH.
MONDAY NIGHT: MOSTLY CLEAR TO PARTLY CLOUDY WITH LOWS IN THE UPPER 20’S NORTH TO AROUND 40 SOUTH.
TUESDAY: MIX OF SUN AND CLOUDS, WARMER. HIGHS IN THE LOW 50’S NORTH TO MID 60’S SOUTH.
TUESDAY NIGHT: INCREASING CLOUDS WITH LOWS MID 40’S TO MID 50’S.
WEDNESDAY: PARTLY TO MOSTLY CLOUDY WITH HIGHS IN THE 60’S.
WEDNESDAY NIGHT: MOSTLY CLOUDY, CHANCE FOR RAIN AND T’STORMS. LOWS IN THE UPPER 40’S TO NEAR 60.
THURSDAY: MOSTLY CLOUDY WITH RAIN AND T’STORMS. HIGHS IN THE MID 50’S TO UPPER 60’S.
THURSDAY NIGHT: CLOUDY WITH RAIN AND A FEW T’STORMS. LOWS IN THE UPPER 30’S TO LOWER 50’S.