Area Forecast Discussion
Issued by NWS Central Illinois
Issued by NWS Central Illinois
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290 FXUS63 KILX 252301 AFDILX Area Forecast Discussion...Updated Aviation National Weather Service Lincoln IL 601 PM CDT Wed Sep 25 2024 .KEY MESSAGES... - Dry weather will continue tonight and tomorrow with seasonable overnight lows in the 50s. Expect high temperatures in the middle to upper 70s by the afternoon. - Unsettled weather is still expected late this week into early next week. A chance of showers begins Thursday night in southeast IL, and most of central IL Friday and Friday night, and continues through the weekend. More widespread showers and the heaviest rainfall is expected Friday and Friday night south of I-70 where 1 to 1.5 inches is expected. Breezy northeast winds will prevail Friday through Saturday with gusts up to 40 mph possible. && .SHORT TERM... (Through Late Thursday Night) Issued at 343 PM CDT Wed Sep 25 2024 Dry weather will continue tonight through tomorrow as the upper level system continues to slide further south of the area. Winds will remain light and skies will be mostly clear through the night. This will lead to possible light fog overnight across the northern part of the CWA, but do not expect dense fog. Hurricane Helene will begin to bring precip to southeast parts of the CWA beginning Thur afternoon into Thur night, but highest chances of precip will only be about 30-40% starting after midnight. Prior to midnight, pops will be only 10-20%. Normal temperatures are expected tonight through tomorrow, with overnight low tomorrow night becoming slightly warmer as clouds and precip begin to move in. Auten .LONG TERM... (Friday through Next Wednesday) Issued at 343 PM CDT Wed Sep 25 2024 Unsettled weather will continue for Friday and Sat and remnants of Helene will move into the area for Fri through Sat night. Most of the precip associated with this will occur Friday through Sat over the CWA. The highest QPF amounts will be Fri and Fri night with amounts of 1-1.60 inches possible south of I-70. Models are different with the rainfall amounts, but have come into better agreement on onset of the precip. Other models have higher amounts of rainfall but consensus is that the higher amounts are overdone. Unfortunately, isolated to scattered showers will likely continue through the weekend after remnants of Helene move off the east. Any rainfall amounts associated with the lighter precip will be minor and not add much to the overall totals. Sunday into Monday the upper level system, combined with the remnants of Helene will slowly move toward the east. As high pressure builds in with dry and cooler weather another mid level trough will drop into the Great Lakes region, missing the CWA and keeping the area dry for Monday night through Wed. Another concern from remnants of Helene is strong sfc winds Friday through Sat. Winds are expected to increase Fri into Fri night with possible gusts pushing 40 mph during the period. Though this is reaching advisory criteria, no advisory product will be issued at this point. Afternoon highs will be around normal through the end of the week, but then warm through the weekend, with some areas reaching into the lower 80s by Sunday and Monday. Cooler temps return for Tue and Wed with highs only reaching to around 70. Overnight lows will be in the 60s Friday night but then become slightly cooler for the weekend and into the next week. Auten && .AVIATION... (For the 00z TAFs through 00z Thursday Evening) Issued at 601 PM CDT Wed Sep 25 2024 High pressure and associated clear skies will become increasingly predominant as an upper level low over souther IL continues to drift southward tonight into Thursday. Winds light and variable overnight, becoming NE 7-10 kts after 15Z. 37 && .ILX WATCHES/WARNINGS/ADVISORIES... None. && $$