AFTERNOON – OVERNIGHT: Clear conditions remain in place this morning across nearly the entire zone 6 and 7 forecast area. This despite an upper-level low and weak wave of low pressure to our south and southeast.
Through the afternoon mostly sunny conditions will remain in place across zone 7 and at least northern portions of zone 6. However, closer to the upper-level low some clouds will likely move in this afternoon across southern zone 6.
A few isolated to widely scattered areas of rain will become possible across southern zone 6 by 1-2 PM this afternoon.
Through the evening hours the chance for some rain will continue to move across zone 6.
Late this evening into the overnight mostly clear to partly clear skies are expected. A few rain showers will likely persist across zone 6 with maybe an isolated shower sneaking into zone 7 later into the overnight. Regardless, no significant rainfall is forecast.
Lows overnight will be in the mid 40’s north to low 50’s south.
New rainfall totals of .20-.30” could occur is very southern zone 6 where more rain is possible. However, I think most totals will be well under .20” with many places remaining dry.
FRIDAY: The upper-level low to the south of the region today will weaken late Thursday through Friday. As it does it will start to get caught up in the jet stream and ushered off to the southeast. So for Friday it will have little impact on the weather.
Sunny to mostly sunny skies look to persist over zones 6 and 7 through the day on Friday. However, models have been picking up on a small surface disturbance Friday afternoon. This could prove to be enough to get some clouds and a few rain showers to develop by 10-11 AM across western Illinois.
Some clouds and a few stray showers will remain possible through the afternoon. However, anything that should form will be very light and brief in nature. Most places will see sunshine and a very nice day out there.
Highs on Friday will be in the low to mid 70’s.
Friday evening and into the overnight any rain showers will quickly fade out. This will lead to a dry and clear overnight.
Lows will be in the upper 40’s to low 50’s.
SATURDAY: The upper-level ridge of high pressure will expand in across the eastern U.S. As it does it will allow for warm temperatures and sunny/mostly sunny skies to be in place for Saturday.
Highs on Saturday will be in the low to mid 70’s in many locations. However, a few locations in the upper 70s south wouldn’t shock me. Winds will be out of the southeast at 6-12 mph, some wind gusts of 20-25 mph will be possible.
Sunday the upper-level ridge will continue to expand northward. As it does the surface high to the east will move to the south and west getting closer to the forecast area.
With the two highs in place sunny to mostly sunny skies will remain in place with perhaps a few clouds mixing into western Illinois by later in the afternoon/evening.
Regardless, Sunday will be a very nice day with highs in the low to upper 70’s.
MONDAY: An area of surface high pressure looks to move over the eastern U.S on Monday. While there will be a southward advancing cold front to the north of the region and an area of low pressure to the west, the high will slow these features down.
With the slowing of the front and low, Monday could prove to be a very nice day with a mix of sun and some clouds. Any precipitation would be held to the north and west of the zones through the day.
Highs will be in the mid to upper 70’s.
Late Monday night into Tuesday morning the low will move in from the west and the front from the north will move south. This will bring scattered rain and some thunderstorms chances back into Illinois through evening/overnight.
LONG – RANGE (MID-LATE NEXT WEEK): Models do vairy next week on forecasts. The EURO shows another upper-level area of low pressure getting cut-off from the main jet stream. This would bring showers chances to the region next week.
However, the CMC model brings in high pressure at the surface keeping the region mostly dry after Monday/Tuesday.
The GFS is not even worth mentioning at this time as model verification scores are so low.
Regardless, the good news is, it doesn’t look like any all-day rains are expected and temperatures will remain warm!