Area Forecast Discussion
Issued by NWS Jackson, KY

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000 FXUS63 KJKL 200759 AFDJKL AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSON KY 359 AM EDT MON OCT 20 2014 .SHORT TERM...(TODAY THROUGH TUESDAY) ISSUED AT 359 AM EDT MON OCT 20 2014 THE REX BLOCK PATTERN CONTINUES OVER THE CONUS THIS MORNING...WITH MUCH OF THE EASTERN CONUS BEING INFLUENCED BY A STRONG TROUGHING PATTERN. THIS TROUGH WILL CONTINUE TO BE OUR MAIN WEATHER DRIVER FOR THE SHORT TERM TODAY THROUGH TUESDAY. DURING THE DAY TODAY...A SHORTWAVE EMBEDDED IN THE LONGWAVE PATTERN WILL CONTINUE TO STRENGTHEN AS IT MOVES FROM THE UPPER GREAT LAKES THIS MORNING TO THE LOWER GREAT LAKES BY LATE THIS AFTERNOON AND EVENING. BY TOMORROW NIGHT IT WILL STRENGTHEN INTO A CLOSED LOW...THEN DIVE SOUTHWARD DURING THE DAY TUESDAY...REACHING THE VIRGINIAS BY TUESDAY EVENING. HERE IT WILL STALL OUT BEFORE SLOWLY MOVING UP THE NEW ENGLAND SEA BOARD DURING THE EXTENDED PERIOD. FOR TODAY...AS THE SHORTWAVE STRENGTHENS...IT WILL DRIVE A SURFACE LOW PRESSURE SYSTEM FROM THE UPPER GREAT LAKES TO THE LOWER GREAT LAKES. FROM THIS SURFACE SYSTEM WILL EXTEND A COLD FRONT. AS THE LOW MOVES...THE COLD FRONT WILL SWEEP FROM NW TO THE SE...AND EVENTUALLY TRAVERSE EASTERN KY LATE TONIGHT AND INTO TUESDAY MORNING. AS SUCH...UPPER LEVEL CLOUDS HAVE ALREADY PROTRUDED INTO THE REGION THIS MORNING IN ADVANCE OF THIS SYSTEM. A WEAK SCATTERED LINE OF RAIN SHOWERS IS NOT FAR BEHIND...CURRENTLY MOVING ACROSS MUCH OF NORTHERN OH...IN...AND WESTERN KY. SO FAR THESE SHOWERS ARE SHOWING UP ON THE RADAR AS VERY LIGHT...WITH LITTLE IMPACTS EXPECTED. UNFORTUNATELY...LATEST MODELS ARE HAVING A HARD TIME COMING TO A CONCLUSION ABOUT THE PRECIP AS IT REACHES EASTERN KY AND CONTINUES AHEAD OF THE FRONT TODAY AND TONIGHT. THE EXACT LOCATION OF WHERE THE BEST QPF AND POPS WILL BE LOCATED CONTINUES TO DIFFER FROM MODEL TO MODEL. THIS WAS FURTHER COMPLICATED BY THE LACK OF 0Z DATA WHILE CREATING THE FORECAST DUE TO A NCF ISSUE. THESE TWO ISSUES HAVE LED TO SLIGHT LACK IN CONSISTENCY BETWEEN OFFICES FOR POPS OVER THE NEXT 24 HOURS. TRIED TO MATCH UP AS BEST AS POSSIBLE. REGARDLESS...THIS IS A MOISTURE DEPRIVED SYSTEM...SO ANY RAIN THAT DOES OCCUR IS NOT EXPECTED TO CAUSE MUCH IN THE WAY OF IMPACTS. ONCE THE FRONTAL BOUNDARY MOVES THROUGH US BY TOMORROW MORNING...EXPECT THE RETURN OF A MORE NORTHERLY FLOW PATTERN AND COOLER TEMPERATURES. AFTERNOON TEMPS WILL ONLY TOP OFF IN THE UPPER 50S TO AROUND 60 ONCE MORE. ALTHOUGH THE FRONTAL BOUNDARY WILL HAVE EXITED...THE UPPER LEVEL LOW WILL BE ON ITS TRANSITION SOUTHWARD TOWARDS THE VIRGINIAS...PULLING THE SURFACE LOW PRESSURE SYSTEM WITH IT. STRONG NORTHERLY FLOW WILL ALLOW FOR WRAP AROUND MOISTURE TO CONTINUE TO FLOW INTO EASTERN KY OFF THE BACKSIDE OF THE LOW. THIS MOISTURE WILL BE VERY WEAK...BUT UPSLOPE FLOW IN THE FAR EAST COULD BE ENOUGH TO PRODUCE LIGHT SHOWERS IN THIS AREA BOTH TONIGHT AND THROUGH THE DAY TOMORROW. EXPECT LITTLE IMPACT FROM THIS...WITH ONLY VERY LIGHT ACCUMULATIONS EXPECTED. .LONG TERM...(TUESDAY THROUGH SUNDAY) ISSUED AT 140 PM EDT SUN OCT 19 2014 A PERSISTENT TROUGH OVER THE EASTERN CONUS WILL BE THE HIGHLIGHT OF THE EXTENDED PERIOD...KEEPING TEMPERATURES BELOW NORMAL AND KEEPING THE THREAT OF A FEW SHOWERS WITH THE EASTERN HALF OF THE FORECAST AREA THROUGH EARLY WEDNESDAY. MODELS ARE IN FAIRLY GOOD AGREEMENT THROUGH THE WEEK...SO CONFIDENCE REMAINS FAIRLY HIGH THROUGH THE EXTENDED. THE TROUGH WILL EXIT LATE IN THE WEEK ALLOWING FOR A MODEST TEMPERATURE RECOVERY AS WE HEAD INTO NEXT WEEKEND...WITH A DRYER PERIOD ANTICIPATED. THE PERIOD WILL START OFF AS A SHORTWAVE IS EXITING THE AREA...WITH ANOTHER ONE DROPPING SOUTH FROM THE NORTH. MODELS HAVE SHIFTED THIS WAVE A BIT FARTHER EAST TODAY...SO HAVE TRIMMED POPS BACK TO THE EAST...KEEPING MUCH OF THE AREA DRY THROUGH TUESDAY. HOWEVER...A FEW SPRINKLES WILL STILL BE POSSIBLE WITH THE AREA UNDER THE INFLUENCE OF THE TROUGH. WILL KEEP THE THREAT OF A SHOWER IN THE EAST AND SPRINKLES ELSEWHERE INTO TUESDAY NIGHT AND EARLY WEDNESDAY. HOWEVER...THE TROUGH WILL CREEP EASTWARD...ALLOWING HEIGHTS TO START TO BUILD BY LATE WEDNESDAY. THIS WILL EVENTUALLY CUT US OFF FROM THE INFLUENCE OF THE TROUGH...AND ALLOW FOR SKIES TO CLEAR OFF AND TEMPERATURES WILL START TO REBOUND BY THURSDAY. THE RIDGE TO THE WEST WILL REALLY PUSH EAST BY FRIDAY INTO SATURDAY...ALLOWING FOR A MORE MODEST RECOVERY IN TEMPERATURES AND KEEPING THE DRY WEATHER AROUND FOR SEVERAL DAYS. AS IT LOOKS NOW...THIS RIDGE MAY PERSIST FOR SOME TIME...KEEPING THE WEATHER DRY INTO THE FOLLOWING WEEK. && .AVIATION...(FOR THE 06Z TAFS THROUGH 06Z MONDAY NIGHT) ISSUED AT 143 AM EDT MON OCT 20 2014 CONDITIONS WILL BE MAINLY VFR THROUGH THE AVIATION PERIOD ON THE BACKSIDE OF HIGH PRESSURE RETREATING TO THE NORTHEAST. THERE IS A POTENTIAL FOR PATCHY FOG LATE TONIGHT AT SME AND LOZ...BUT VIS SHOULDN/T GET ANY WORSE THAN MVFR FROM THIS. CIGS WILL LIKELY DEVELOP AND LOWER THROUGH THE AFTERNOON ON MONDAY...BUT LATEST SOUNDINGS ARE SHOWING THE LOWEST CLOUD DECK AROUND 3 TO 4K FEET WITH ONLY SCT CIGS AT BEST. LIGHT AND VARIABLE WINDS TONIGHT WILL AVERAGE AROUND 5 KTS FROM THE SOUTHWEST THROUGH THE DAY MONDAY. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM...JMW LONG TERM...KAS AVIATION...JMW

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