Area Forecast Discussion
Issued by NWS Wilmington, OH
Issued by NWS Wilmington, OH
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090 FXUS61 KILN 051350 AFDILN AREA FORECAST DISCUSSION National Weather Service Wilmington OH 950 AM EDT Wed Jun 5 2024 .SYNOPSIS... Showers and thunderstorms will occur today ahead of a cold front crossing east through the region tonight with dry air found in its wake. However, cold air aloft may combine with daytime heating to produce scattered shower activity on both Thursday and Friday afternoon in an otherwise dry pattern. && .NEAR TERM /UNTIL 8 PM THIS EVENING/... Increasing moisture, instability, and lift ahead of a cold front will result in isolated to scattered showers this morning, with thunderstorms also possible. While an initial batch of showers is exiting east, additional showers are moving up from Central Kentucky. Stronger convection is expected this afternoon as the cold front arrives. A line of thunderstorms currently over Eastern Illinois will reach Northwest Ohio around 4 pm. Additional storms are likely to develop and push across the Dayton and Cincinnati areas by around 6 pm. From an environment holding upwards of 1000 J/KG CAPE and moderately strong winds aloft, there will be a chance for isolated damaging winds with some of the storms, though the latest HRRR keeps gusts below severe limits. Heavy downpours are also probable with PWAT over 1.5 inches and warm cloud depth over 10000 ft. Highs will be a touch lower than yesterday, ranging from near 80 in the southwest to the mid 80s in the north and northeast. && .SHORT TERM /8 PM THIS EVENING THROUGH 6 PM THURSDAY/... Thunderstorm activity will be ongoing this evening, with the forcing ahead of the approaching cold front increasing the potential for damaging winds. The cold front will cross in the late evening in the west, a little after midnight in the east. As it does pass, any precip will rapidly come to an end. Low temperatures will range from 60 in the west to 65 in the east with decreasing cloud cover. Upper level energy nosing into northern Ohio from a deep low pressure center in the northern Great Lakes could combine with an overturning atmosphere due to cold air aloft to spark afternoon showers, moreso in eastern and northern CWA. This scenario will need to overcome a dry lower atmosphere which is well established in the post-frontal environment. Highs will be a degree or two on either side of 80, warmest in northern Kentucky. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Northwest flow aloft with surface high pressure offering a dry period Thursday night into the first part of Friday. The flow around a mid level low settling into the eastern Great Lakes may lead to a few showers over the far northeast. This chance will be diurnally driven Friday and Saturday afternoon with only slight chance pops. Energy rotating around the mid level low will result in a hang back trof/new low over the Great Lakes late this weekend into early next week. Considerable model solution spread is observed in the depth of this trof and how progressive this is. Deterministic GFS is more progressive than the ECMWF but the GFS ensemble shows more of a lingering trof - which is more similar to the deterministic ECMWF and its ensemble solution. Have slight chance to chance pops Sunday and Monday with a diurnal uptick during the afternoon. Have a dry forecast Tuesday as minor ridging builds into the area. Temperatures look to trend below normal Friday with highs ranging from the lower 70s to the mid 70s and then near normal Saturday and Sunday and Monday when readings are expected to top out between 75 and 80. Only a rise of a couple of degrees are expected for Tuesday with reading still close to normal. && .AVIATION /14Z WEDNESDAY THROUGH SUNDAY/... Low stratus over IN and western OH looks to slowly move east before mixing out in the next few hours, possibly affecting DAY a bit longer through 16Z as this terminal looks to be solidly in the area of these low clouds. Shower activity is not affecting any terminals attm. ARW model was heavily weighted in the forecast as it best represented current precip areas over the region. This had the shower activity hold off until around noon or a little after for much of the CWA and terminals. CVG/LUK could see an earlier start, but if it does fire in the tri-state before this, it will be scattered and not necessarily at or near these terminals. A significant set of models are relatively rain-free over the CWA through 18Z and then begin ramping up the convection for the rest of the afternoon into the evening hours. Activity will be most concentrated immediately ahead of a cold front late today and early evening, then end as the front passes in the latter part of the evening. Aside from the IFR cigs noted now and in the immediate future, did not introduce MVFR cigs in showers until after 17-18Z, a little later 19-20Z further northeast at ILN and CMH/LCK. Showers and thunderstorms will become widespread for a few hours beginning in the late day and ending later in the evening, ending with the cold frontal passage. OUTLOOK...MVFR cigs/vsbys may occur in showers and thunderstorms that are possible Saturday night and Sunday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && $$ SYNOPSIS...Franks NEAR TERM...Coniglio/Franks SHORT TERM...Franks LONG TERM...AR AVIATION...Franks