Area Forecast Discussion
Issued by NWS Wilmington, OH

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000 FXUS61 KILN 011817 AFDILN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 217 PM EDT WED JUL 1 2015 .SYNOPSIS... HIGH PRESSURE WILL SETTLE OVER THE REGION TODAY. AN AREA OF LOW PRESSURE WILL MOVE INTO THE OHIO VALLEY ON THURSDAY INTO FRIDAY...WITH CHANCES FOR SHOWERS AND THUNDERSTORMS GRADUALLY INCREASING GOING INTO THE WEEKEND. TEMPERATURES WILL REMAIN SLIGHTLY BELOW NORMAL FOR THE NEXT SEVERAL DAYS. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... WEAK FRONTAL BOUNDARY SINKING SOUTHWARD APPROACHING THE OHIO RIVER WILL ALLOW HIGH PRESSURE TO CONTINUE TO DOMINATE TODAYS WEATHER. SOME SLIGHT POSSIBILITIES OF CONVECTION DEVELOPING TOWARD EVENING ALONG AND SOUTH OF WHERE THE BOUNDARY EVENTUALLY SETTLES JUST SOUTH OF THE OHIO RIVER. COOL HIGHS TODAY WITH NORTHEAST FORECAST AREA UNDER CLOUDS FROM WRAP AROUND DEPARTING LOW NOW OVER NE ONTARIO...AND CLOUDS ALSO NEAR/SOUTH OF OHIO RIVER AS ASSOCIATED WITH SOUTHERN PLAINS SYSTEM AND ASSOCIATED BOUNDARY. && .SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/... ALTHOUGH THE BRIEF REPRIEVE FROM ACTIVE WEATHER WILL ALMOST CERTAINLY NOT LAST THROUGH THE END OF THE WEEK...THE DEGREE OF IMPACT FOR THE ILN FORECAST AREA REMAINS SOMEWHAT IN QUESTION...AS THE LATITUDINAL POSITION OF THE STORM TRACK COMING OUT OF THE MIDDLE MISSISSIPPI VALLEY IS STILL BEING HANDLED INCONSISTENTLY BY THE ARRAY OF MODEL SOLUTIONS. AHEAD OF A SURFACE LOW...AND POWERED BY SPEEDY NORTHWESTERLY FLOW ALOFT...AN INITIAL ROUND OF CONVECTION IS EXPECTED TO MOVE THROUGH THE LOWER OHIO VALLEY ON WEDNESDAY AND WEDNESDAY NIGHT. BY EARLY THURSDAY MORNING...THE SEMI-STALLED FRONTAL BOUNDARY WILL BEGIN TO PIVOT A LITTLE FURTHER INTO THE OHIO VALLEY...EVENTUALLY SPREADING A CHANCE OF PRECIPITATION INTO THE SOUTHERN SECTIONS OF THE ILN FORECAST AREA. THERE ARE NO SIGNS OF SIGNIFICANT FORCING OUTSIDE OF THIS FRONTAL ZONE...SO POPS WILL BE KEPT HIGHEST CLOSER TO THE FRONT...MAINLY IN THE SOUTHERN HALF OF THE FORECAST AREA. HOWEVER...HOW THIS FRONT SHIFTS WITH TIME (AND ESPECIALLY THE TRACK OF SURFACE LOW CENTERS ALONG IT) REMAINS SOMETHING THAT IS BEING MODELED DIFFERENTLY ON A NEARLY RUN-TO-RUN BASIS. ON THE NORTH SIDE OF THE BOUNDARY...INSTABILITY WILL BE GENERALLY FAIRLY WEAK...SO ANY SEVERE THREAT APPEARS LIKELY TO REMAIN CONFINED TO SOUTH OF THE FORECAST AREA. ALTHOUGH TEMPERATURES FOR THURSDAY AND FRIDAY WERE LOWERED SLIGHTLY FROM PREVIOUS FORECASTS...THE POSITION ON THE NORTH SIDE OF THE FRONTAL BOUNDARY AND POSSIBLE PRECIPITATION WILL MEAN THAT THESE NUMBERS COULD STILL BE ON THE HIGH SIDE OF WHAT ENDS UP VERIFYING. && .LONG TERM /SATURDAY THROUGH TUESDAY/... UPPER TROUGH RESIDING OVER EASTERN CONUS WILL KEEP UNSETTLED WEATHER PATTERN OVER THE REGION. LACK OF STRONG FORCING SHOULD RESULT IN SCATTERED TO ISOLATED CONVECTION UNTIL A COLD FRONT BRINGS A BETTER CHANCE FOR THUNDERSTORMS ON TUESDAY. MAIN CONCERN FRIDAY AND SATURDAY WILL BE SCATTERED THUNDERSTORMS THAT MAY DEVELOP MAINLY IN SOUTHERN LOCATIONS IN THE VICINITY OF A STALLED BOUNDARY. A BETTER CHANCE FOR THUNDERSTORMS IS FORECAST FOR SUNDAY WHEN A RATHER LARGE SURGE OF MOISTURE IS SHOWN TO ARRIVE ON A SOUTHERLY LOW LEVEL FLOW. EXPECT A RELATIVE LULL IN CONVECTION MONDAY WHEN MODELS INDICATE WEAK HIGH PRESSURE. COLD FRONT COULD BRING ANOTHER ROUND OF THUNDERSTORMS TO MOST LOCATIONS ON TUESDAY. WITH LOWER THAN AVERAGE 500 MB HEIGHTS AND THE PRESENCE OF CLOUDS AND PRECIP COUPLED WITH A LACK OF STRONG WARM ADVECTION...EXPECT TEMPERATURES TO BE A BIT BELOW NORMAL. HIGHS ARE FORECAST TO BE AROUND 80 EACH DAY...COMPARED TO NORMAL HIGHS IN THE MID 80S. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... IMPROVED VISIBILITIES TO VFR WITH VFR CIGS AS WELL. WITH FILTERED SUNSHINE TODAY AND NO EXPECTATION OF PRECIPITATION...A REPEAT OF THIS MORNINGS LIFR NOT EXPECTED...JUST POSSIBLE MVFR VSBYS AT KLUK. WITH THE FRONTAL BOUNDARY TO STALL ALONG/SOUTH OF OHIO RIVER...CANT RULE OUT ISOLATED SHOWERS. WITH HIGHER RES MODELS HINTING AT A MESOSCALE COMPLEX NEAR/SOUTH OF OHIO RIVER LATE TONIGHT...BRIGNING VCSH TO JUST KCVG/KLUK NEAR DAYBREAK. OUTLOOK...THUNDERSTORMS POSSIBLE THURSDAY THROUGH SUNDAY. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && $$ SYNOPSIS...HATZOS NEAR TERM...JDR SHORT TERM...HATZOS LONG TERM...CONIGLIO AVIATION...JDR

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