000
FXUS61 KILN 230253
AFDILN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
1053 PM EDT WED MAY 22 2013

.SYNOPSIS...
A WEAK COLD FRONT WILL MOVE THROUGH THE REGION OVERNIGHT. A
SECONDARY FRONT WILL BRING A CHANCE OF RAIN AGAIN ON THURSDAY.
MUCH COOLER AIR WILL MOVE INTO THE REGION ON FRIDAY... AS HIGH
PRESSURE BUILDS INTO THE OHIO VALLEY THROUGH SATURDAY.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
MORE WIDESPREAD SHOWER AND ISOLATED THUNDERSTORM ACTIVITY IS
BEGINNING TO EXIT NORTHEASTERN PORTIONS OF THE FA. A THIN LINE OF
SHOWERS ACROSS THE NORTHERN PORTIONS OF THE FA IS ASSOCIATED WITH
A WEAK FRONTAL BOUNDARY. THERE IS NOT REALLY A PRONOUNCED
TEMPERATURE DIFFERENCE OF WIND SHIFT WITH THIS BOUNDARY.
ADDITIONAL SHOWER ACTIVITY IS WORKING INTO WESTERN PORTIONS OF THE
FA. EXPECT THIS ACTIVITY TO CONTINUE TO MOVE TO THE EAST AND THEN
GRADUALLY WEAKEN SOME THROUGH THE NIGHT.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH FRIDAY NIGHT/...
INITIAL FRONT KIND OF WASHES OUT EARLY THURSDAY...BUT A SECONDARY
FRONT DROPS IN BEHIND IT. IN ADDITION...A PRETTY SHARP H5 TROF
SWINGS UP THE OHIO VALLEY. THIS SHOULD PROVIDE THE BEST LIFT OF
THIS SYSTEM. INSTABILITY WILL BE VERY WEAK...BUT JUST
ENOUGH FOR SOME RISK OF THUNDER. THE AIR MASS ALOFT WILL BE
INCREASINGLY COLD...HELPING TO LEAD TO THE POSSIBILITY OF
CONVECTIVE SHOWERS. SO UPPED POPS ON THU. WENT CATEGORICAL IN THE
NW...LIKELY POPS FOR A MUCH OF THE REST OF THE FA.

CONVECTION WILL LINGER INTO THU EVENING AS THE S/W CONTINUES TO
SWING THROUGH. HIGH PRESSURE WILL BUILD IN FOR FRIDAY. COULD SEE
SOME FAIR WX CU AS COLD AIR ALOFT KICKS THE LAPSE RATES OVER.
SKIES SHOULD THEN CLEAR FOR FRIDAY NIGHT.

HIGHS ON THURSDAY WILL HAVE A WIDE RANGE. THIS IS DUE TO THE COLD
FRONT PUSHING THRU THE REGION. HIGHS IN THE NW WILL BE LIMITED TO
THE UPPER 60S...WHILE IN THE SE THEY WILL PUSH INTO THE MID 70S.
LOWS WILL FALL PACK INTO THE 40S THURSDAY NIGHT AND ONLY WILL
REBOUND INTO THE LOWER TO MID 60S.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
LARGE AREA OF HIGH PRESSURE WILL HOLD SWAY OVER THE OHIO VALLEY AND
GREAT LAKES REGION FOR THE WEEKEND. PREVIOUS MODELS WERE SHOWING A
NARROW TONGUE OF QPF/POPS PUSHING SOUTHEAST FROM THE IA/IL AREA BUT
WERE KEYING ON A H5 S/W CUTTING THROUGH THE ESTABLISHED RIDGE AND
DISSIPATING AS IT WENT DOWNSTREAM INTO THE OHIO VALLEY. THIS
SCENARIO IS STILL A POSSIBILITY BUT SEEN AS A DISTANT OUTLIER AT
THIS TIME.

GFS IS STILL SHOWING THESE H5 DISTURBANCES UNDERCUTTING THE RIDGE
AND NOSING INTO THE REGION MON/TUES WHERE EUROPEAN IS SOMEWHAT
SIMILAR WITH AN ELEVATED CONVERGENT LAYER BUT MUCH FURTHER SOUTHWEST
AND OUT OF CWA.

SURFACE HIGH MOVES OFFSHORE EARLY NEXT WEEK WITH DRYING SOUTHEAST
SURFACE WINDS OVER THE OHIO VALLEY. UPPER LEVEL FLOW IS SHOWING A
BROADENING OF THE H5 RIDGE AS IT MOVES OVER THE EASTERN THIRD OF THE
COUNTRY. HAVE INCREASED THE CHANCES FOR MID LEVEL DISTURBANCES TO
UNDERCUT THE RIDGE AT THIS TIME BUT KEEP THE THREAT FOR SHOWERS LOW
AT 20% TOWARDS THE MIDDLE OF NEXT WEEK.

EXPECT A GRADUAL WARMUP EACH DAY...STARTING IN THE UPPER 60S TO
AROUND 70 SATURDAY...WARMING TO NEAR 80/LOW 80S BY WED. PM LOWS WILL
BE COMFORTABLY COOL IN THE 40S THROUGH MON MORNING UNDER A DRY
AIRMASS AND THEN WARM TO THE CLIMATOLOGICAL NORMS IN THE MID 50S BY
MID WEEK.

&&

.AVIATION /03Z THURSDAY THROUGH MONDAY/...
SHOWERS AND ISOLATED THUNDERSTORMS AROUND THE AREA AT THE START OF
THE TAF PERIOD WILL DECREASE IN COVERAGE THE NEXT FEW HOURS. A FEW
LIGHT SHOWERS WILL STILL BE POSSIBLE THROUGH THE FIRST HALF OF THE
NIGHT AS A SUBTLE FRONTAL BOUNDARY MOVES THROUGH THE AREA. NOT
EXPECTING MUCH IN THE WAY OF A WIND SHIFT WITH THIS BOUNDARY.

MODELS ARE INDICATING THE POTENTIAL FOR SOME MVFR TO IFR CIGS LATE
IN THE OVERNIGHT TIME FRAME FOR A FEW HOURS. DECIDED TO LIMIT CIGS
TO MVFR AT THIS TIME. ALSO KEPT A FEW HOUR TIME PERIOD OF MVFR
VSBYS AT KLUK.

A SECONDARY COLD FRONT WILL MOVE THROUGH DURING THE DAY ON
THURSDAY THIS TIME WITH A MORE PRONOUNCED WIND SHIFT. IN ADDITION
EXPECT SHOWERS TO DEVELOP DURING THE DAY ACROSS THE TAF SITES. A
FEW RUMBLES OF THUNDER WILL ALSO BE POSSIBLE. DUE TO THE COOLER
AIR MOVING IN ALOFT EXPECT SOME SMALL HAIL TO ALSO BE POSSIBLE
DURING THE AFTERNOON AND EARLY EVENING HOURS ON THURSDAY. WINDS
WILL BEGIN TO GUST DURING THE AFTERNOON AND EARLY EVENING HOURS ON
THURSDAY WITH THE SECONDARY FRONT AND CIGS WILL LOWER INTO THE
MVFR CATEGORY.

OUTLOOK...MVFR CEILINGS LIKELY LATE THURSDAY INTO THURSDAY NIGHT.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...NONE.
KY...NONE.
IN...NONE.

&&

$$
SYNOPSIS...SITES
NEAR TERM...NOVAK
SHORT TERM...SITES
LONG TERM...FRANKS
AVIATION...NOVAK