Area Forecast Discussion
Issued by NWS Wilmington, OH

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000 FXUS61 KILN 202014 AFDILN Area Forecast Discussion National Weather Service Wilmington OH 414 PM EDT Thu Oct 20 2016 .SYNOPSIS... Occasional showers will continue into tonight before tapering off through the day on Friday as a cold front pushes slowly through the area. A much colder airmass will filter into the region behind the front with below normal readings expected for Friday and Saturday. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... The frontal boundary is pushing slowly southeast across our area this afternoon, currently situated along or just southeast of the I-71 corridor. Cloud cover across the region has helped to limit instability this afternoon and as a result, the severe threat looks fairly slim through the rest of the day. That being said, there is some weak instability present across southeast portions of our forecast area so will hang on to a chance of thunder there through the rest of the afternoon before tapering it off early this evening. Meanwhile, the upper level trough will shift east across the area tonight with an associated 850-500 mb deformation axis pivoting slowly east into our area. Pcpn associated with this feature is currently lifting up across eastern Indiana into northwest Ohio and this should very gradually work its way east across our area tonight. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/... The upper level trough and the deformation axis will continue to shift off to the east through the day on Friday. This will allow for light showers to gradually taper off from west to east across the area through the day. In northerly low level flow on the back side of the trough, decent CAA will persist through the day with 850 mb temperatures dropping down below zero degrees celsius by late afternoon. The combination of this and some lingering clouds should help limit temperatures through the day with highs only in the low to mid 50s. Northwesterly low level flow will continue Friday night and this could allow for a few lingering clouds as we get a bit of a fetch off of Lake Michigan. Lows Friday night will be dependent on the amount of cloud cover and whether or not the winds stay up a little. For now will go with lows in the upper 30s to lower 40s but if we end up with more clearing and light winds, this may be too warm and frost would become a concern. Surface high pressure will begin to build up into the Tennessee Valley through the day on Saturday. This will lead to dry conditions heading into the weekend but with the cold air mass still in place, expect highs on Saturday only in the mid 50s. && .LONG TERM /SUNDAY THROUGH THURSDAY/... On Sunday the upper level low and trough axis will be over the Northeast United States with surface high pressure located over the Southeastern United States. 850 mb temperatures will slowly rise to just below 10 degrees C which will support high temperatures in the mid to upper 60s. Sunday night into Monday morning a shortwave will push southeast down mid-level ridging and around the upper level low. The GFS is slightly more progressive and weaker with the shortwave compared to the ECMWF. Both 20.12z model runs bring the shortwave slightly further west than yesterday and therefore try to bring the heart of the colder air slightly further west as well. The ECMWF and the GFS push the front through the area by Monday evening. The frontal passage also appears to be a dry frontal passage as PWATs remain around 0.60". Behind the front highs will cool down back to normal as the heart of the cold air still misses the area (850 mb temperatures around 4 degrees C). Tuesday the upper level trough will finally head east of the area taking the cooler air with it. Wednesday into Thursday a shortwave will eject out of the midwest and approach the area. This means clouds will begin to increase on Wednesday and into Thursday. Have also introduced a chance of rain into the forecast Thursday as the low approaches. PWATs on the GFS rise to above 1.00" with limited instability. Upper level forcing looks good though as the ILN forecast area is in the diffluent side of the trough axis and widespread PV moves over the area. For now have just edged the chance of precipitation up as model consistency remains low at this time. && .AVIATION /20Z THURSDAY THROUGH TUESDAY/... A wave of low pressure will lift northeast from the mid MS VLY through the Ohio Valley today. Widespread rain showers will overspread all TAF sites this afternoon with prevailing MVFR conditions and occasional IFR conditions. The low pressure system and associated cold front will progress east during the late afternoon with more precipitation working in behind the front. Widespread IFR conditions will develop behind the front. Northwest winds will strengthen and gust at times up to 22 kts. IFR CIGS will prevail through most of the night. Precipitation will become light overnight before ending toward sunrise with visibilities improving. Ceilings will lift to MVFR by late morning. OUTLOOK...No significant weather expected. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && $$ SYNOPSIS...JGL NEAR TERM...JGL SHORT TERM...JGL LONG TERM...Haines AVIATION...AR is the U.S. government's official web portal to all federal, state and local government web resources and services.