AFTERNOON-OVERNIGHT: High pressure will continue to build into the forecast zones throughout the daytime hours today. While places across zone 7 and northern zone 6 have started out mostly clear, farther south clouds are in place.
As drier air works southward through the daytime hours’ clouds will start to thin out south as well, giving way to some sunshine late this morning into early afternoon.
While high pressure will be in place today, the upper-levels of the atmosphere will be very cold. This will create instability through the afternoon. This instability will force some clouds to develop and some isolated to widely scattered rain showers to form. By 12-1 PM some of those showers do look to be developing across both zones 6 and 7.
Through the evening the hit and miss showers will continue across both zones 6 and 7. By 5-6 PM the latest HRRR models does show the showers that will be ongoing.
Through the evening into the overnight we will lose daytime heating and therefore instability. Since these showers will be instability driven, they will fade out through the evening hours. By midnight only a couple of light showers look to linger across the forecast zones.
Through the overnight an isolated shower may remain, but it will be extremely brief and light in nature. Overall a mostly clear night is expected with high pressure in control.
Lows will be in the mid 40’s north to around 50 south.
THURSDAY: High pressure will remain in control of our weather on Thursday. While many places will be sunny, some clouds will remain so a mix of sun and clouds will be the official forecast across zones 6 and 7.
Dry conditions will remain in place across the forecast zones on Thursday. Highs will be in the mid 60’s north to around 70 south.
Thursday afternoon into the evening an area of low pressure will be moving closer to the region from the southwest. As it does, clouds will really start to thicken up from south to north across Illinois ahead of it.
Thursday night into Friday overcast skies will remain in place across zones 6 and 7. While most of the overnight will be dry, some isolated to widely scattered rain may work its way into southern zone 6 by 4-6 AM Friday morning.
Lows overnight will be in the low 50’s north to mid 50’s south.
FRIDAY: An area of low pressure will work its way to the south of the region through the day on Friday. The exact track of the low will be key in forecasting rain chances, timing, and placement. Along with the overall temperatures for the day.
Right now by 7-8 AM some scattered showers will be possible across zone 6 closer to the low pressure system.
Through the morning into early afternoon some scattered rain and perhaps an isolated t’storm will remain possible across zone 6 and maybe very southern zone 7.
As the initial low will move farther east of the region through the afternoon, rain chances will be on the decrease. However, there will be an upper-level disturbance rolling through in the afternoon so some isolated showers will be possible across Illinois as it moves through.
Highs on Friday will be in the low 60’s to upper 60’s.
Through the evening into the overnight a few showers will be likely. However, these will be limited as an area of high pressure moves in and showers fade.
WEEKEND: High pressure will be in control of the weather on Saturday. This will allow the weekend to get off to a pretty nice start across the forecast area. Sunny to mostly sunny skies will be likely through most of the day as drier, sinking air associated with the high will be in place.
However, temperatures aloft will be very cold once again on Saturday. With cooler air aloft instability will build through the afternoon once again. With that in mind, some isolated afternoon rain showers are not totally out of the question. Although, I think coverage will be pretty limited due to the area of high pressure.
Highs on Saturday will be in the mid 60’s to low 70’s.
Sunday high pressure will remain in control of the weather, so yet another nice day will be in-store for the area. Sunny to mostly sunny skies will be in place across the region with perhaps some more clouds building through the afternoon.
On Sunday the upper-level trough that brought cool temperatures aloft on Saturday will be moving off to the east. However, it does appear that it will still have enough influence on our weather that cool air will remain at the upper-levels. This may allow for enough instability for a couple isolated showers to develop, but right now it’s really not enough coverage to mention specifics.
Temperatures on Sunday will continue to moderate with highs in the low to mid 70’s.
LONG-RANGE (NEXT WEEK): At the surface an area of high pressure will remain in control of the weather. This will allow for a very nice start to the work week with sunshine and very little chance of rain.
At the upper-levels the trough will eject off of the East Coast. Behind it a ridge of high pressure will start to build in over the region. This ridge will not only reinforce the calm and dry conditions; it will also allow warmer air to overspread the forecast zones. By early next week above average temperatures will be in place with highs in the 80’s!
Looking a little longer down the road into mid to late next week a larger storm system is forecast to take shape. Right now timing, threats, and location are still in question, this is something we will have to fine tune as the forecast period draws closer.