Area Forecast Discussion
Issued by NWS Wilmington, OH

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000 FXUS61 KILN 221752 AFDILN Area Forecast Discussion National Weather Service Wilmington OH 152 PM EDT Mon May 22 2017 .SYNOPSIS... High pressure will bring drier and cooler conditions for the beginning of the week. Another system will approach the Ohio Valley at midweek, bringing chances of rain back into the area. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Upper level low pivots through the northern Great Lakes today, with westerly flow across the Ohio Valley. Sfc high will build into the region becoming centered over Ohio by evening. This high will bring dry conditions and temperatures a little below normal. Expect mainly sunny conditions with only some cirrus streaming across the area. Highs today will be around 70. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/... High pressure will linger at the sfc tonight keeping the region dry. Lows will drop to the lower to mid 50s. Tuesday into Tuesday night, upper level energy will push the H5 low down the Mississippi Valley. This digging will delay the eastward development of pcpn, keeping the region dry. Highs in Tuesday will warm into the lower to mid 70s, before cooling back to the lower to mid 50s. && .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/... By Wednesday the center of the H5 low will be in the vicinity of Missouri, with a sfc low over the lower Ohio Valley. The sfc low will move eastward on Wednesday pushing an area of showers and possibly some embedded thunder across the region. 12Z GFS/ECMWF runs have, interestingly, trended faster with the progression of the upper low -- keeping rain chances around for Thursday, but leaving Friday mostly dry. Will compromise this with the previous forecast (and a desire to not go too fast with the departure of an upper low) by allowing PoPs to continue into Friday morning for the eastern half of the CWA. Though Thursday will remain similar in temperature to Wednesday, fairer weather conditions will allow for a notable increase in temperatures on Friday. Model spread is quite high for the weekend forecast, giving low confidence in the specifics. A very brief period of ridging is expected to move across the Ohio Valley on Friday, before a series of shortwaves in the pseudo-zonal flow begin to affect the region on Saturday and Sunday. Within the GEFS suite and from run-to-run of the operational ECMWF/GFS, there are insurmountable differences in wave amplitude/timing. For now, low PoPs will be maintained through the entire weekend, with slightly above normal temperatures. && .AVIATION /18Z MONDAY THROUGH SATURDAY/... VFR conditions will prevail over the region as high pressure builds across the area today. Expect high level clouds to thin some tonight before thickening up on Tuesday ahead of the next weather system. West winds at 10 kts or less will be light and variable tonight and then east at less than 10 kts Tuesday. OUTLOOK...MVFR ceilings possible Wednesday and Thursday. MVFR visibilities possible Wednesday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && $$ SYNOPSIS...Hickman/AR/Sites NEAR TERM...AR/Sites SHORT TERM...Sites LONG TERM...Hatzos/Sites AVIATION...AR

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