Area Forecast Discussion
Issued by NWS Jackson, KY

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000 FXUS63 KJKL 262100 AAA AFDJKL AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE JACKSON KY 400 PM EST THU FEB 26 2015 .SHORT TERM...(THIS EVENING THROUGH FRIDAY NIGHT) ISSUED AT 355 PM EST THU FEB 26 2015 19Z SFC ANALYSIS SHOWS LOW PRESSURE PASSING BY TO THE EAST WHILE A DEEP LOW IS APPROACHING FROM THE NORTHWEST. AN ARCTIC COLD FRONT FROM THIS IS MOVING INTO KENTUCKY AND THIS WILL SWEEP ACROSS EASTERN KENTUCKY LATER THIS EVENING. ON REGIONAL RADAR...THE LIGHT SNOW ASSOCIATED WITH THIS BOUNDARY IS STARTING TO SETTLE DEEPER INTO THE STATE. EAST KENTUCKY SAW PARTLY SUNNY SKIES THIS AFTERNOON WITH SOME LOW CLOUDS CLINGING TO OUR FAR EASTERN AREAS WHILE HIGH CLOUDS PASSED THROUGH NORTHERN PARTS OF THE CWA. LOWER CLOUDS ARE INBOUND FROM WESTERN AND CENTRAL KENTUCKY NOW...AHEAD OF THAT FRONT. TEMPERATURES WERE ABLE TO SPIKE UP TO NEAR 40 DEGREES FOR MUCH OF THE AREA THIS AFTERNOON THANKS TO THE PARTIAL SUNSHINE WHILE ONLY LOW 30S WERE ACHIEVED IN THE NORTHWEST. DEWPOINTS REMAIN IN THE TEENS IN THE NORTHWEST WHILE LOWER AND MIDDLE 20S ARE FOUND IN THE EAST. WINDS WERE GENERALLY FROM THE NORTHWEST AT 5 TO 10 MPH WITH GUSTS TO 15 MPH. THE MODELS ARE IN GOOD AGREEMENT ALOFT AS A WEAK WAVE PASSES TO THE SOUTH OF THE AREA THIS EVENING FOLLOWED BY A STRONGER AND LARGER TROUGH THAT SETTLES INTO THE OHIO VALLEY TONIGHT. THIS TROUGH WILL BRING ITS CORE ENERGY ACROSS OHIO DURING THE DAY FRIDAY BEFORE TAPERING OFF AMIDST REBOUNDING HEIGHTS OVER KENTUCKY FRIDAY NIGHT. THE ECMWF IS A BIT QUICKER THAN THE OTHER MODELS WITH THESE HEIGHT RISES AND MAY BE GETTING AHEAD OF ITSELF. GIVEN THE GENERAL AGREEMENT...AT LEAST INTO FRIDAY EVENING...HAVE FAVORED THE HIGHER RESOLUTION MODEL GUIDANCE FROM THE HRRR... RAP13...AND NAM12 FOR WX SPECIFICS. SENSIBLE WEATHER WILL FEATURE CLOUDS ARRIVING ALONG WITH SNOW SHOWERS THIS EVENING AND CONTINUING THROUGH THE NIGHT IN ASSOCIATION WITH THE ARCTIC AIR POURING BACK INTO THIS PART OF THE STATE. TEMPERATURES WILL FALL INTO THE TEENS IN MOST PLACES BY DAWN THANKS TO THE CAA WITH SOME SINGLE DIGITS POSSIBLE NORTH OF INTERSTATE 64. ANY LINGERING SNOW SHOWERS WILL COME TO AN END FRIDAY MORNING IN FAR EASTERN PARTS OF THE AREA WITH SOME SUNSHINE POSSIBLE BY AFTERNOON...BUT TEMPERATURES WILL STILL STRUGGLE TO MAKE IT INTO THE LOWER 20S BY MIDDAY. THIS SETS THE STAGE FOR A VERY CHILLY NIGHT WITH SINGLE DIGITS LIKELY ON TAP FOR THE VALLEYS AND MORE OPEN AREAS...WHILE SOME LATE ARRIVING HIGH CLOUDS AND THE INVERSION MAY SPARE THE RIDGES THE COLDEST OF THE AIR. CANNOT RULE OUT SOME FLURRIES ARRIVING TOWARD DAWN SATURDAY AHEAD OF THE NEXT SYSTEM...BUT HAVE LEFT THEM OUT FOR NOW. AGAIN USED THE CONSSHORT TO JUMP START THE T/TD/WIND GRIDS THROUGH THE DAY FRIDAY...WITH SOME TERRAIN BASED ADJUSTMENTS MADE AT NIGHT. AFTER THAT...USED THE SUPERBLEND TO INITIATE THE GRIDS INTO SATURDAY MORNING WITH MINOR CHANGES. AS FOR POPS...ENDED UP ON THE HIGH SIDE...CLOSER TO THE MET...OF RATHER LOW MOS GUIDANCE TONIGHT...THEN SIMILAR FOR THE REST OF THE SHORT TERM. .LONG TERM...(SATURDAY THROUGH THURSDAY) ISSUED AT 400 PM EST THU FEB 26 2015 BROAD MID AND UPPER LEVEL TROUGH ACROSS THE ENTIRE CONUS WILL DEEPEN OVER THE FAR SOUTHWEST...BAJA THROUGH THE WEEKEND PLACING OUR AREA IN A GENERAL SOUTHWEST FLOW REGIME FOR THE BULK OF THE EXTENDED. THIS WILL TEND TO KEEP STORM TRACKS SOMEWHAT CENTERED OVER THE OHIO VALLEY REGION AS A SERIES OF DISTURBANCES RIDE NORTHEAST ACROSS THE EASTERN CONUS. OVERALL IT APPEARS WE WILL BE GETTING INTO A VERY ACTIVE WEATHER PATTERN...TYPICAL FOR THE APPROACH OF EARLY SPRING. ACTUAL SENSIBLE WEATHER...PRECIPITATION TYPES...AMOUNTS ETC. WILL DEPEND MORE ON EXACT TRACK OF SURFACE LOWS THROUGH THE REGION. CONSIDERING THE CURRENT SNOWPACK ALONG WITH THE WATER CONTENT PRESENT ACROSS A LARGE PART OF THE AREA...POTENTIAL HYDRO ISSUES WILL NEED TO BE CONSIDERED SHOULD MUCH OF ANY PRECIPITATION WE REALIZE THROUGH THE PERIOD FALL IN THE FORM OF RAIN. MODEL SOLUTIONS APPEAR TO BE IN FAIRLY GOOD AGREEMENT THROUGH THE EXTENDED. A SERIES OF STORM SYSTEMS SHOOT OUT OF THE INTER-MOUNTAIN/ SOUTH CENTRAL PLAINS AREA IN RAPID FIRE FASHION THROUGH THE PERIOD. THE FIRST SHOULD AFFECT OUR AREA SUNDAY INTO MONDAY...THE SECOND TUESDAY THROUGH EARLY WEDNESDAY AND THEN THE THIRD LATE WEDNESDAY NIGHT INTO THURSDAY. ATTM MODEL CONSENSUS IS FOR SFC LOWS TO TRACK GENERALLY TO OUR NORTHWEST...KEEPING OUR AREA IN THE WARM SECTORS OF THESE SYSTEMS. HOWEVER...THE COLDER AIR THAT FILTERS IN BEHIND EACH PASSING SYSTEM MAY ALLOW FOR THE A WINTRY MIX AT THE ONSET OF EACH NEW ROUND OF WEATHER. THIS MAY BE ESPECIALLY TRUE NEXT TUESDAY MORNING. AFTER A VERY COLD START FOR FRIDAY...EXPECT TEMPERATURES TO GRADUALLY MODERATE TOWARDS MORE NORMAL LEVELS THROUGH THE EXTENDED THOUGH OVERALL WE WILL REMAIN BELOW NORMS FOR THIS TIME OF THE YEAR. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z FRIDAY AFTERNOON) ISSUED AT 130 PM EST THU FEB 26 2015 MVFR CIGS IN THE EAST HAVE MOVED OUT OF THE TAF SITES WITH THE DEPARTURE OF THE COASTAL LOW. ADDITIONAL HIGH CLOUDS ARE DRIFTING OVER THE AREA...BUT HAVING LITTLE IMPACT ON THE AVIATION CONDITIONS. LOWER CLOUDS ARE EXPECTED TO MOVE BACK OVER EAST KENTUCKY FROM THE NORTHWEST WITH THE ARRIVAL OF AN ARCTIC COLD FRONT. SNOW SHOWERS WILL BE POSSIBLE ALONG AND JUST BEHIND THIS FRONT...LINGERING INTO THE NIGHT. HAVE ADDRESSED THE SNOW WITH A VCSH DURING THIS TIME AND ALSO WITH PREVAILING MVFR VIS AND IFR CIGS IN THE BETTER SNOWS ANTICIPATED DURING EVENING. WINDS WILL BE GENERALLY OUT OF THE NORTHWEST THROUGH THIS PERIOD AT 5 TO 10 KTS. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM...GREIF LONG TERM...SBH AVIATION...GREIF

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