Area Forecast Discussion
Issued by NWS Jackson, KY

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FXUS63 KJKL 300618 AAA
AFDJKL

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE JACKSON KY
218 AM EDT WED JUL 30 2014

.UPDATE...
ISSUED AT 218 AM EDT WED JUL 30 2014

THE FORECAST REMAINS ON TRACK. JUST FRESHENED UP THE HOURLY SKY
COVER...TEMPERATURES...AND DEW POINTS FOR THE NEXT FEW HOURS BASED ON
THE LATEST TRENDS IN OBSERVATIONS.

UPDATE ISSUED AT 1028 PM EDT TUE JUL 29 2014

TWENTY-FOUR HOUR TEMP DIFFERENCES SHOW WE ARE RUNNING A SOLID 3 TO 6
DEGREES LOWER THAN THIS TIME LAST NIGHT. WITH DRIER AIR IN PLACE AND
LESS CLOUD COVER...TEMPS WILL PROBABLY BOTTOM OUT A COUPLE DEGREES
LOWER THAN CURRENT FORECAST MINS. THEREFORE LOWERED OVERNIGHT LOWS
JUST A BIT. THE REST OF THE FORECAST LOOKED GOOD. WILL UPDATE THE
ZONE PACKAGE TO REMOVE EVENING WORDING AND SPRINKLES. OTHERWISE WILL
UPDATE GRIDS FOR LATEST TRENDS AND THOUGHTS.

UPDATE ISSUED AT 857 PM EDT TUE JUL 29 2014

RADAR MOSAIC SHOWING DIMINISHING ECHOS OVER THE LAST FEW HOURS...
INDICATING THAT SPRINKLES ARE COMING TO AN END ACROSS THE REGION.
PLAN TO REMOVE SPRINKLES BY NEXT UPDATE. SEVERAL WEAK IMPULSES
ROUNDING THE BOTTOM OF ATYPICAL DEEP EASTERN CONUS TROUGH WILL KEEP
THE THREAT OF A FEW MAINLY DIURNAL AFTERNOON SHOWERS IN THE FORECAST
FOR NORTHERN PORTIONS OF THE FORECAST AREA ALONG WITH COOLER THAN
NORMAL TEMPERATURES THROUGH TOMORROW. SKIES ARE CLEARING OUT QUITE
WELL THIS EVENING AND WILL HELP SET THE STAGE FOR ANOTHER COOL NIGHT.
CURRENT FORECAST IS IN GOOD SHAPE AND MAINLY ADJUSTED GRIDS FOR
LATEST HOURLY TRENDS.

&&

.SHORT TERM...(THIS EVENING THROUGH WEDNESDAY NIGHT)
ISSUED AT 345 PM EDT TUE JUL 29 2014

19Z SFC ANALYSIS SHOWS HIGH PRESSURE OVER THE MIDWEST AND INTO THE
OHIO VALLEY. THIS IS ALL BENEATH A DEEP UPPER LEVEL LOW SPINNING
NORTH OF THE GREAT LAKES. WITH THAT LOW ALOFT...COOLER TEMPERATURES
JUST OFF THE SFC ARE ALSO INDUCING STRATO CU ACROSS THE AREA FURTHER
HELPING TO KEEP TEMPERATURES ON THE COOL SIDE TODAY. IN FACT...
SEVERAL SPOTS MAY HAVE RECORD LOW MAXIMUM TEMPERATURES TODAY NOT FAR
FROM 70 DEGREES. TEMPERATURES AT 19Z VARY FROM THE MID 60S NORTH OF
THE MOUNTAIN PARKWAY TO THE LOWER 70S IN THE FAR SOUTH. DEW POINTS
ARE GENERALLY IN THE LOWER AND MIDDLE 50S WITH LIGHT NORTH TO
NORTHWEST WINDS NOTED. ON RADAR...A FEW SPRINKLES MAY BE MAKING IT TO
THE GROUND OVER FAR EASTERN PARTS OF THE CWA...BUT FOR THE MOST PART
ANY DISCERNIBLE SHOWERS ARE CONFINED TO WESTERN PORTIONS OF WEST
VIRGINIA. THE CLOUDS ARE GRADUALLY CLEARING OUT...SETTING THE STAGE
FOR ANOTHER UNSEASONABLY COOL NIGHT.

THE MODELS REMAIN IN GOOD AGREEMENT ALOFT THROUGH THE SHORT TERM.
THEY ALL DEPICT THE DEEP TROUGH AND CLOSED LOW OVER THE HUDSON BAY
COVERING THE EASTERN HALF OF THE NATION AND HOLDING IN PLACE AS A
PIVOT SOUTH OF ITS CORE TAKES PLACE. THIS WILL REACH NEAR THE
INTERNATIONAL BORDER BY THURSDAY MORNING. FOR THE OHIO VALLEY THIS
MEANS CONTINUED LOW HEIGHTS WITH NORTHWEST FLOW...BUT LITTLE IN THE
WAY OF DECENT SHORTWAVES RUNNING THROUGH THIS PART OF THE TROUGH TO
AFFECT EAST KENTUCKY. GIVEN THE MODEL AGREEMENT...WILL CONTINUE TO
FAVOR THE HIGHER RESOLUTION SOLUTIONS FROM THE HRRR AND NAM12.

SENSIBLE WEATHER WILL FEATURE ANOTHER CHILLY NIGHT...FOR LATE JULY...
THAT WILL BENEFIT FROM MOSTLY CLEAR SKIES ALLOWING FOR GOOD
RADIATIONAL COOLING. THIS SETUP WILL FAVOR THE VALLEYS FOR THE COLDER
TEMPS AND KEEP THE RIDGES...ABOVE THE THERMAL BELT...A NOTCH MILDER.
HAVE SET UP THE LOW TEMPERATURE GRID TONIGHT...AND TO A SIMILAR
EXTENT WEDNESDAY NIGHT...FOR THIS. IN ADDITION...ANTICIPATE SOME
PATCHY TO WIDESPREAD FOG DEVELOPING TOWARD DAWN IN THE VALLEYS BOTH
NIGHTS. FOR WEDNESDAY PROPER...WITH THE CORE OF THE UPPER LOW
APPROACHING...THE NAM12 SPITS OUT SOME LIGHT PCPN IN OUR NORTH. THIS
IS A REASONABLE POSSIBILITY...SO HAVE INCLUDED A SMALL CHANCE FOR
SHOWERS FROM WEDNESDAY AFTERNOON INTO THE FIRST PART OF THE EVENING
IN OUR FAR NORTHERN COUNTIES. GIVEN THE COOL MID LEVEL TEMPS AND
STEEP LAPSE RATES...WOULD NOT RULE OUT A STRAY BOLT OF LIGHTNING...
BUT FOR NOW WILL LEAVE IT AS JUST SLIGHT CHANCES FOR SHOWERS IN THE
GRIDS AND ZONES.

AGAIN USED THE CONSSHORT...AND ITS BC VERSION...AS A STARTING POINT
FOR THE T...TD...AND WIND GRIDS THROUGH THE FIRST 24 HOURS AND THE
CONSALL SUITE FOR THE REMAINDER OF THE SHORT TERM. MADE SOME
ADJUSTMENTS TO LOW TEMPERATURES TONIGHT AND WEDNESDAY NIGHT TO BETTER
REFLECT THE EXPECTED RIDGE TO VALLEY SPLITS. AS FOR POPS...OUTSIDE OF
WEDNESDAY AFTERNOON...KEPT THEM SUB 14 PERCENT FOR THE SHORT TERM
FORECAST PERIOD. DURING WEDNESDAY AFTERNOON THE POPS ENDED UP CLOSER
TO THE WETTER MET NUMBERS.

.LONG TERM...(THURSDAY THROUGH TUESDAY)
ISSUED AT 345 PM EDT TUE JUL 29 2014

ANOMALOUS UPPER LEVEL TROUGH WILL REMAIN IN PLACE ACROSS THE EASTERN
U.S. THROUGH THE PERIOD...ALTHOUGH IT WILL DEAMPLIFY BY EARLY NEXT
WEEK LEAVING OUR AREA IN NORTHWEST FLOW ALOFT. THIS UPPER LEVEL
SETUP WILL ENSURE A CONTINUATION OF BELOW NORMAL TEMPERATURES
THROUGH THE LONG TERM PERIOD. THE COLD FRONT NOW STALLED ALONG THE
GULF AND ATLANTIC COASTS TO OUR SOUTH WILL WAFFLE AROUND BEING A
FOCUS FOR SHOWERS AND THUNDERSTORMS.

THE PERIOD WILL START OUT DRY ON THURSDAY...BUT BECOME INCREASINGLY
UNSETTLED LATE THURSDAY NIGHT INTO THE DAY ON FRIDAY AS OUR LOW
LEVEL FLOW BECOMES SOUTHEASTERLY TRANSPORTING ATLANTIC MOISTURE
WESTWARD. FOCUSING MECHANISMS ARE DIFFUSE AND WEAK...SO THE NET
RESULT SHOULD BE DAILY CHANCES OF SHOWERS AND THUNDERSTORMS FROM
FRIDAY THROUGH THE WEEKEND BUT MAINLY FOCUSED DURING THE AFTERNOON
AND EVENING HOURS. RAIN CHANCES THEN DECREASE INTO EARLY NEXT WEEK
AS SURFACE HIGH PRESSURE EDGES INTO THE REGION FROM THE NORTHWEST
PUSHING THE DEEPER MOISTURE BACK TO OUR EAST.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z WEDNESDAY NIGHT)
ISSUED AT 218 AM EDT WED JUL 30 2014

VFR CONDITIONS WILL GRADUALLY GIVE WAY TO SOME MVFR FOG...ALTHOUGH
EXPECT THAT ANY IFR OR WORSE FOG TO BE CONSTRICTED TO THE DEEPER
RIVER VALLEYS. THE FOG WILL BURN OFF BY AROUND 13Z...WITH SCATTERED
STRATOCU IN THE 4 TO 6K FEET AGL RANGE DEVELOPING DURING THE DAY.
ANY ISOLATED SHOWER ACTIVITY LOOKS TO STAY NORTH OF THE TAF SITES.
WINDS WILL BE OUT OF THE WEST AND NORTHWEST THROUGH THE
PERIOD...GENERALLY AROUND 5 KTS OR LESS.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

UPDATE...GEOGERIAN
SHORT TERM...GREIF
LONG TERM...ABE
AVIATION...GEOGERIAN





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