Area Forecast Discussion
Issued by NWS Jackson, KY

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000 FXUS63 KJKL 210757 AFDJKL AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSON KY 357 AM EDT THU AUG 21 2014 .SHORT TERM...
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(TODAY THROUGH FRIDAY) ISSUED AT 357 AM EDT THU AUG 21 2014 THE LATEST SURFACE MAP FEATURES HIGH PRESSURE ACROSS THE GULF COAST STATES...WITH LOW PRESSURE ACROSS THE PLAINS STATES. A STATIONARY BOUNDARY EXTENDS EAST FROM THE PLAINS INTO THE GREAT LAKES/OHIO VALLEY REGION. ALOFT...AN UPPER LEVEL LOW CONTINUES TO SPIN ACROSS THE NORTHERN GREAT LAKES...WITH AN UPPER LEVEL RIDGE CENTERED NEAR THE NORTHERN GULF OF MEXICO...AND MORE TROUGHING FEATURED ACROSS THE NORTHERN ROCKIES. SEVERAL COMPLEXES OF THUNDERSTORMS HAVE BEEN GENERATING AND THEN RIDING SOUTHEAST ON THE PERIPHERY OF THE UPPER LEVEL RIDGE OVER THE PAST FEW DAYS. CURRENTLY...EASTERN KENTUCKY REMAINS QUIET AS ONLY A WEAKENING SMALLER COMPLEX OF THUNDERSTORMS IS SLOWLY MOVING THROUGH SOUTHEAST ILLINOIS AND SOUTHWEST INDIANA. THE NEXT MORE ORGANIZED COMPLEX IS CURRENTLY MOVING THROUGH MINNESOTA. THE MODEL GUIDANCE HAS BEEN ALL OVER THE PLACE WITH THE TIMING OF THE MORE ORGANIZED CONVECTION AS OF LATE. AS SUCH...HAVE USED A GENERAL BLEND OF THE GUIDANCE AND THE INHERITED FORECAST. AS THE UPPER LEVEL RIDGE SLOWLY BUILDS INTO THE REGION THROUGH FRIDAY...IT WILL GENERALLY NUDGE THE MCS TRACK FURTHER NORTHEAST...HOWEVER SINCE THERE WILL BE PLENTY OF FUEL FOR THE STORMS AND A WEAK SYNOPTIC PATTERN IN PLACE...CAN NOT RULE OUT OUTFLOW INFLUENCE FURTHER SOUTHWEST. SOME STORMS COULD APPROACH SEVERE LIMITS...AND ISOLATED FLASH FLOODING WILL ALSO BE A POSSIBILITY...ESPECIALLY WHERE STORMS CAN MOVE PARALLEL TO ANY ESTABLISHED OUTFLOW BOUNDARIES. WILL HIGHLIGHT THESE THREATS IN THE HWO. POPS WILL GENERALLY PEAK IN THE AFTERNOON HOURS TODAY AND FRIDAY...WITH LESSER CHANCES DURING THE OVERNIGHT HOURS. HIGHS TODAY WILL AVERAGE IN THE 85 TO 90 DEGREE RANGE...WITH AROUND 90 DEGREES EXPECTED FOR MOST LOCATIONS ON FRIDAY. .LONG TERM...(FRIDAY NIGHT THROUGH WEDNESDAY) ISSUED AT 357 AM EDT THU AUG 21 2014 THE EXTENDED PORTION OF THE FORECAST BEGINS ON FRIDAY NIGHT WITH A WELL DEVELOPED MID LEVEL RIDGE CENTERED OVER THE MID WEST AND LONGWAVE TROUGH ENTERING THE NORTHWEST WITH AN EXITING TROUGH OVER THE NORTHEAST. THE MID LEVEL RIDGE AXIS EVENTUALLY SHIFTS EAST OVER THE OH VALLEY BY MONDAY AS IT WEAKENS A BIT WITH THE APPROACHING TROUGH OVER THE NORTHERN PLAINS AND THE TROUGH OVER THE NORTHEAST EXITING INTO THE ATLANTIC. THIS PATTERN BASICALLY KEEPS THE RIDGE OVER EASTERN KENTUCKY THROUGH THE REST OF THE EXTENDED. WITH THIS PATTERN IN PLACE THROUGH SUNDAY...EASTERN KENTUCKY REMAINS IN NORTHWEST FLOW WITH STILL A FEW MCS/S LIKELY POISED TO TRACK SOUTHEAST INTO THE AREA FOR THIS WEEKEND. WHILE MODELS INHERENTLY WILL HAVE TROUBLE TRACKING THEM...THE FIRST ONE SHOULD BE MOVING THROUGH FRIDAY NIGHT WITH THE NEXT ONE POSSIBLY SATURDAY NIGHT. BY SUNDAY...THE RIDGE AXIS REALLY BEGINS TO SET IN AND ADDITIONAL STRONG CONVECTION MAY BE LESS LIKELY AND MAY BE MORE TIED TO DIURNAL PROCESSES WITH A STATIONARY BOUNDARY ALONG THE EASTERN PORTION OF THE CWA. BY MONDAY AND THROUGH WEDNESDAY...THE MID LEVEL RIDGE AXIS MOVES OVER THE AREA WHICH SHOULD EFFECTIVELY CUT OFF CONVECTION...AT LEAST DEEP CONVECTION. SOME AFTERNOON SHOWERS AND POSSIBLY A STORM OR TWO MAY DEVELOP UNDER THE RIDGE. THE SOLUTION OF THE ALL MODEL BLEND WOULD SUGGEST SOME UNCERTAINTY THERE WITH THE BEST CHANCE OF PRECIP FRIDAY NIGHT THROUGH SUNDAY. THIS IS IN GOOD AGREEMENT WITH THE GFS AND EURO AS WELL. OVERALL THE BROAD BRUSH OF POPS THROUGH THE FIRST 3 DAYS OF THE EXTENDED SEEMS NEEDED DUE TO THE NATURE OF THE MODELS HAVING TROUBLE DEPICTING THE COMPLEXES MOVING THROUGH BUT DID GO WITH SOME DIURNAL CHARACTERISTICS. BY THE END OF THE EXTENDED...THE MODELS SEEM TO HINT AT THE RIDGE MOVING FARTHER EAST AS A STRONG SHORTWAVE AND ASSOCIATED COLD FRONT SEEMS POISED TO MOVE THROUGH THE MS RIVER VALLEY AND INTO THE OH VALLEY. IN ADDITION...THE WARM AND MUGGY WEATHER STILL LOOKS TO BE ON TAP THROUGH THE WEEKEND WITH HIGHS AROUND 90 THROUGH MONDAY AND DEW POINTS AROUND 70. THE END OF THE EXTENDED DOES SHOW SOME RELIEF FROM THE WARM AND HUMID WEATHER WITH THE APPROACH OF THE AFOREMENTIONED COLD FRONT.
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&& .AVIATION...(FOR THE 06Z TAFS THROUGH 06Z THURSDAY NIGHT) ISSUED AT 214 AM EDT THU AUG 21 2014 IFR OR WORSE FOG/STRATUS WILL BE THE MAIN CONCERN THROUGH THE NIGHT. LOCATIONS THAT SAW MORE SUSTAINED HEAVY RAINFALL WILL BE THE MOST SUSCEPTIBLE. SOME LINGERING HIGH CLOUDS AND LIGHT SOUTH TO SOUTHWEST WINDS WILL KEEP THE FOG AT BAY FOR SOME OF THE BROADER VALLEYS AND RIDGETOPS THROUGH THE NEXT COUPLE OF HOURS...HOWEVER AS SKIES CLEAR OUT AND WINDS LIKELY LIGHTEN EVEN MORE...EXPECT THE FOG/LOW STRATUS TO BUILD IN MORE EXTENSIVELY. ONCE THE FOG BURNS OFF BETWEEN 12 AND 14Z...SCATTERED TO NUMEROUS CONVECTION WILL LIKELY THREATEN ONCE AGAIN FROM 15Z ONWARD. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM...GEOGERIAN LONG TERM...SHALLENBERGER AVIATION...GEOGERIAN

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