Area Forecast Discussion
Issued by NWS Wilmington, OH

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000 FXUS61 KILN 210550 AFDILN Area Forecast Discussion National Weather Service Wilmington OH 1250 AM EST Wed Feb 21 2018 .SYNOPSIS... A cold front will move through the area this morning, bringing widespread showers and cooler temperatures. An unsettled weather pattern will then persist through the rest of the week as a series of disturbances affect the region. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... No major changes to the forecast overnight. A cold front will push into the northwest late tonight. The majority of the rain will be along and behind the front. This means categorical PoPs for areas nw of I-71 by sunrise, with just chance PoPs farther southeast. Models are still showing some elevated instabilities in the southern areas ahead of the front. This may be enough for a few embedded thunderstorms to develop across our southwest late. There will be a large temperature range across the region by the end of the night. The far nw sections will be down to 40-45 degrees, while locations southeast of I-71 will still be in the lower 60s. && .SHORT TERM /6 AM THIS MORNING THROUGH 6 PM THURSDAY/... The cold front will continue to push southeast across the area Wednesday morning and should be southeast of our area by early afternoon. With a narrow ribbon of elevated instabilities remaining just ahead of the front, will continue with an isolated thunderstorm across the southeast through the morning hours. Otherwise, fairly widespread shower activity is expected through much of the day and into Wednesday night as a series of additional waves work east along the cold front that will stall out to our south. As we get on the backside of the front and into some CAA, temperatures will drop off through the day on Wednesday. This will eventually allow for some below freezing temperatures to possibly work into our north later Wednesday night. There are some disagreements in the models as to how far south this will get though with the 12Z ECMWF not as aggressive with the cold air. As a result, ptype may become an issue Wednesday night as the colder air at the surface undercuts the warmer air aloft. This could lead to some freezing rain across parts of our north, primarily north of the I-70 corridor but confidence is not terribly high given some of the model discrepancies. Considered going with a flood watch to match up with our western neighbors but with the models generally showing a weakening QPF footprint across our area with the front tonight into Wednesday, think we will be okay flood wise through this first round. Later shifts can then try and pinpoint where/if a flood watch will be needed for the additional rounds of pcpn later in the week. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... The long term continues to be advertised as active with multiple rounds of precipitation possible and above normal temperatures. Thursday morning precipitation will be spread over the area with the GFS and NAM indicating the potential for freezing rain. The ECMWF is slightly further north with the freezing rain. During the day Thursday temperatures will quickly warm with highs in the mid 40s to near 50 degrees across northern Kentucky. Thursday afternoon it looks like we might get a brief break in the precipitation with the old ECMWF still showing a wetter pattern. The latest CMC appears to be a compromise between the GFS and ECMWF with precipitation confined to our southeastern zones. The issue has to deal with how strong the subtropical ridge is forecast to be off the Carolina coast. The ECMWF shows a slightly stronger ridge, while the GFS shows slightly weaker ridging. Due to this, the track of the corresponding shortwave changes. Friday, yet another surface low will push across the area and ripple along a stalled front. This means more heavy rainfall will be possible as PWATs remain around 1.30" or near record territory. Late Friday into Saturday the pattern will finally begin to change as the subtropical ridge off the east coast breaks down and the upper level low off the west coast pushes east. A secondary surface low is then forecast to move across the area Saturday morning ahead of a more potent surface low that is forecast to form Saturday evening across the plains. This surface low (or third) will then push across the area Sunday with a cold front pushing across the area Sunday morning. Due to the multiple rounds of precipitation forecast there is a threat for flooding which includes river and creek rises. Everyone should continue to watch for updates for the Friday through Sunday morning period. Any slight change in the strength of the ridge can easily change the QPF footprint. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/... Southerly flow will persist through most of the night with VFR conditions. As a cold front approaches, some showers may develop along with MVFR ceilings. Expect the front to cross the terminals from 11Z to 13Z. After frontal passage, ceilings will drop to IFR along with persistent showers that may lower visibilities to MVFR. Winds will shift to northwest. The showers will eventually decrease in coverage, but IFR ceilings will linger. Winds will slowly veer through the day and eventually become northeast after 00Z. Looks like ceilings will lift to MVFR late in the day at most locations. Rain will spread across the area late in the TAF period. This will bring some visibility restrictions. In addition, ceilings are forecast to fall back to IFR except from KDAY to KCMH/KLCK. OUTLOOK...MVFR/IFR ceilings and visibilities are likely to continue into Saturday night. MVFR ceilings may linger Sunday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && $$ SYNOPSIS...JGL NEAR TERM...Sites SHORT TERM...Novak LONG TERM...Haines AVIATION...

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