EVENING – OVERNIGHT: This evening the rain and snow associated with the clipper will come to an end as the area of low pressure continues to dive to the south and east of zones 6 and 7.
Overnight some remaining moisture will remain in place at low-levels. Some warmer air aloft will work in as well. This will create a temperature inversion, trapping a lot of that moisture low to the ground. So overnight fog and some drizzle will remain possible across the zones.
You can see the reduced visibility forecast from the RPM model which is picking up on the fog.
Lows overnight will be below freezing so any fog or drizzle will freeze on surfaces. So some slippery conditions will be possible Wednesday morning across the forecast zones. The only exception may be across very southern zone 6 where temperatures may hover just above freezing, but could still fall at or just below freezing.
WEDNESDAY – THURSDAY: An area of high pressure will move in during the day on Wednesday. However, there will be an upper level impulse moving through the forecast area as well. For this reason I do think some a few isolated light snow showers will be possible across Illinois through the morning. Skies will remain partly to mostly cloudy through the day.
Highs will be in the mid 30’s north to mid 40’s south.
Wednesday night the area of high pressure will start to move off to the east and northeast. However, it does appear there will still be some areas of fog overnight.
With lows in the low 20’s to low 30’s across the forecast zones any fog that does develop will likely freeze once again. Here is the RPM forecast visibility into Thursday morning.
Thursday we will watch a warm front approach from the regions south. This will increase cloud cover across the forecast area, so we will call for upper 30’s north to mid/upper 50’s south for highs, that will be heavily dependent on the warm front location.
Thursday night the warm front will continue to lift northward through the area. As it does strong southerly winds will pick up and warm air will quickly start to surge in. Lows overnight Thursday will be in the upper 30’s to upper 40’s.
FRIDAY: Friday will be unseasonably warm for February with highs warming into the mid 50’s to perhaps right around 70° in southern portions of the forecast area! We will call for a mix of clouds and sun on Friday.
Winds on Friday will impressive as well. As the front lifts north winds will increase from the south/southwest. Sustained winds of 12-25 mph can be expected. Gusts will be very impressive with 35-50 mph wind gusts possible!
WEEKEND: We look to continue with the unseasonably warm temperatures into this weekend. Saturday will likely be the better of the two days as surface high pressure builds into the forecast area.
This will keep us with mostly sunny skies across most of Illinois with perhaps more clouds across southern zone 6. Highs on Saturday will be in the mid 50’s to mid 60’s!
Saturday night a weak area of low pressure at the surface will move through the forecast area. While overall this looks pretty weak it will likely still allow for some isolated to widely scattered rain to develop overnight.
Lows Saturday night will be in the mid 40’s to low 50’s. So precipitation is anticipated to fall as all rain.
Sunday A few showers may continue across the forecast area early, but will likely end by late morning. In fact, in the afternoon there could be some clearing, especially across northern zone 6 and zone 7.
Highs on Sunday will be in the upper 40’s to upper 50’s.
LONG-RANGE: Looking into the longer range the models do remain active next week. You can see via the 500 mb flow several disturbances will be rolling through.
Also via the CMC model you can see the snowfall forecast through the end of next week calling for snow across northern IL and into WI. As we have said and learned many times this year, these systems like to come south as time goes on, so we will watch for at least the potential for wintry weather next week.
7 DAY FORECAST
WEDNESDAY: AREAS OF FREEZING FOG EARLY. THEN PARTLY TO MOSTLY CLOUDY. VERY ISOLATED SNOW SHOWER NORTH/RAIN SHOWER SOUTH. HIGHS IN THE MID 30’S NORTH TO MID 40’S SOUTH. NORTHWEST WINDS AT 6-12 MPH, GUSTING TO 20 MPH.
WEDNESDAY NIGHT: AREAS OF FREEZING FOG. THEN PARTLY TO MOSTLY CLOUDY. LOWS IN THE UPPER TEENS NORTH TO AROUND 30 SOUTH.
THURSDAY: PARTLY CLOUDY, WARMING. HIGHS IN THE UPPER 30’S NORTH TO UPPER 50’S SOUTH. SOUTHEAST WINDS AT 5-15 MPH, GUSTING TO 25-30 MPH.
THURSDAY NIGHT: PARTLY CLOUDY, MILD. ISOLATED RAIN SHOWER WEST? LOWS IN THE UPPER 30’S TO UPPER 40’S.
FRIDAY: A MIX OF CLOUDS AND SUN, UNSEASONABLY WARM, VERY WINDY. A FEW SHOWERS ACROSS IN/OH POSSIBLE. HIGHS IN THE MID 50’S TO NEAR 70. SOUTHWEST WINDS AT 12-25 MPH, GUSTS OF 35-45 MPH POSSIBLE.
FRIDAY NIGHT: MOSTLY CLEAR. LOWS IN THE MID 30’S TO MID 40’S.
SATURDAY: SUNNY NORTH, MORE CLOUDS ACROSS ZONE 5/6, VERY NICE. HIGHS IN THE MID 50’S TO MID 60’S. SOUTHERLY WINDS AT 6-12 MPH, GUSTS TO 20 MPH.
SATURDAY NIGHT: INCREASING CLOUDS, 30% CHANCE OF RAIN SHOWERS. LOWS IN THE MID 40’S TO LOW 50’S.
SUNDAY: MOSTLY CLOUDY, SCATTERED AREAS OF RAIN. HIGHS IN THE UPPER 40’S TO UPPER 50’S.
SUNDAY NIGHT: MOSTLY CLOUDY, CHANCE OF A RAIN AND/OR SNOW SHOWERS. LOWS IN THE LOW 30’S TO AROUND 40.
MONDAY: CLOUDY WITH A 10-20% CHANCE OF RAIN/SNOW SHOWERS. HIGHS IN THE UPPER 30’S TO UPPER 40’S.
MONDAY NIGHT: INCREASING CLOUDS, A FEW SNOW SHOWERS, COLDER. LOWS IN THE LOW 20’S TO LOWER 30’S.
TUESDAY: MOSTLY CLOUDY WITH A CHANCE FOR RAIN SHOWERS. HIGHS IN THE MID 30’S TO UPPER 40’S.
TUESDAY NIGHT: PARTLY CLOUDY, SNOW CHANCES WEST? LOWS IN THE LOW 20’S TO LOW 30’S.