Area Forecast Discussion
Issued by NWS Wilmington, OH

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101 FXUS61 KILN 220242 AFDILN Area Forecast Discussion National Weather Service Wilmington OH 942 PM EST Tue Feb 21 2017 .SYNOPSIS... Showers will be possible through tonight along a weak cold front. Dry weather will be found on Wednesday as return flow sets up ahead of the next system. A warm front will lift north through the Ohio Valley Thursday night, and then some thunderstorms may develop with the passage of a cold front Friday night. && .NEAR TERM /THROUGH WEDNESDAY/... An area of upper level diffluence in between a weak northern stream system and a stronger southern stream system has been contributing to widespread pcpn this evening across much of our area. This is being aided by a weak 20-25 knot low level jet nosing up into the mid Ohio Valley. All of this is forecast to slowly weaken as it shifts off to the southeast through the overnight hours. Will therefore continue with categorical pops across about the southern two thirds of our area through this evening and then gradually taper off pcpn from the northwest overnight. The cloud cover should help keep temps from dropping off too much with overnight lows mainly in the lower 50s. && .SHORT TERM /WEDNESDAY NIGHT/... What is left of any frontal convergence will be found across eastern sections as Wednesday begins. This will keep a 20 to 30 percent chance of showers in the forecast for the east. As the day progresses the chance should dissipate. Abundant low level moisture will keep the skies cloudy for the morning, but some mixing by afternoon should bring some peaks at the sun. With H8 temperatures around 8C, highs should be able to reach the mid 60s again. The region will be warm sectored Wednesday night, but the models are showing quite a bit of cloud cover. In addition, several models are bringing a vort max thru the zonal flow. This is providing lift and causing some scattered showers to develop, mainly along and se of I-71. Lows will remain warm with lows in the lower to mid 50s. && .LONG TERM /THURSDAY THROUGH TUESDAY/... No large scale swings in the forecast this afternoon for the extended period. Tried to limit shower activity on Thursday first in the southeast during the morning as the warm front lifts northeast through the region, then along and north of the I-70 corridor in the afternoon and early evening. Forcing then lifts well north and away from the immediate CWA, with good southerly flow setting up on Friday. Thursday night lows will be unseasonably mild (for high temperatures) and be in the low to mid 50s. Friday will see highs ahead of any rainfall reach into the 70s. Have pushed back the threat of showers on Friday to ramp up in the afternoon, and added the thunder threat from the afternoon into the overnight period. Feel that most of the convective threat will occur after 0z, peaking with fropa during the late evening, and then rapidly ending by daybreak in the east. Saturday will see cold pool convective showers possible and experience more normal high temperatures in the 40s. The lower lcls in the cool airmass may support some snow showers in northern portions of the CWA - again north of the I-70 corridor and primarily late in the day and early evening with quickly waning precipitation chances. The cooler temperatures will last through the weekend and then see a warmup for next week, along with increasing threats for rain, developing into thunderstorms with a cold frontal passage expected Tuesday or Wednesday. Expect any rain in the warm sector with the next system to be minimal and then be concentrated with the diurnal passage of the front. Even with this, blended models and have some low chances for showers starting as early as Monday. && .AVIATION /03Z WEDNESDAY THROUGH SUNDAY/... Rain showers are continuing to spread slowly east northeast across the mid Ohio Valley early this evening. This is in an area of upper level diffluence to the north of an upper level low moving across the southern Mississippi Valley. This is forecast to slowly shift east overnight and weaken. In the meantime though, expect fairly widespread shower activity to persist along and southeast of the I-71 corridor this evening and into the overnight hours. A weak secondary short wave will also move across the southern Great Lakes and this may help some scattered shower activity linger elsewhere across the area through the overnight hours. Cigs are currently running VFR but as the low levels moisten up, expect them to drop through MVFR later tonight and into IFR late tonight into Wednesday morning. This will also likely be accompanied by some MVFR to IFR fog restrictions later tonight and into Wednesday morning. We should then see a gradual improvement back into MVFR cigs as we progress through the afternoon and the low levels begin to dry out a bit. OUTLOOK...MVFR ceilings and vsbys are possible Wednesday night. Thunderstorms are possible Thursday and Friday. MVFR ceilings and vsbys are possible Saturday. && .CLIMATE... Record High Temperatures Date CVG CMH DAY Wed 2/22 71(1922) 70(1930) 69(1922) Thu 2/23 72(1985/1996) 66(1906/1985) 68(1985) Fri 2/24 72(1930) 72(1961) 67(1930/1961) && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && $$ SYNOPSIS...Franks/Sites NEAR TERM...JGL SHORT TERM...Sites LONG TERM...Franks AVIATION...JGL CLIMATE... is the U.S. government's official web portal to all federal, state and local government web resources and services.