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000
FXUS61 KILN 132335
AFDILN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
735 PM EDT MON MAY 13 2013

.SYNOPSIS...
HIGH PRESSURE WILL BRING DRY WEATHER TONIGHT AND TUESDAY. A FEW
SHOWERS MAY AFFECT EASTERN COUNTIES TUESDAY NIGHT WHEN A WEAK
DISTURBANCE IS FORECAST TO INTERACT WITH A WARM FRONT. A SLOW
MOVING FRONTAL BOUNDARY WILL PROVIDE THE FOCUS FOR SHOWERS AND
THUNDERSTORMS WEDNESDAY THROUGH FRIDAY.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
HIGH PRESSURE STRETCHING FROM THE GULF COAST TO THE GREAT LAKES
WILL RESULT IN DRY WEATHER TONIGHT. EXPECT CUMULUS TO DISSIPATE
THIS EVENING...BEFORE HIGH CLOUDS MOVE IN FROM THE NORTHWEST AHEAD
OF AN UPPER RIDGE. SLIGHT WARM ADVECTION WILL ALLOW TEMPERATURES
TO REMAIN A COUPLE DEGREES WARMER THAN LAST NIGHT...WITH LOWS
RANGING FROM THE UPPER 30S EAST TO THE LOW 40S WEST.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/...
FOR TUESDAY...HIGH PRESSURE WILL BE CENTERED TO THE
SOUTHEAST...WITH A DEVELOPING WARM FRONT TRAILING A LOW OVER SOUTH
CENTRAL CANADA. DRY WEATHER IS THE LIKELY RESULT OF THIS PATTERN.
WITH THE WARM FRONT SETTING UP NEAR THE EASTERN EDGE OF THE
CWA...TEMPERATURES WILL RISE INTO THE 70S FOR HIGHS.

A FEW SHOWERS MAY OCCUR EARLY TUESDAY NIGHT OVER NORTHEAST
COUNTIES IN RESPONSE TO A SHORT WAVE RIPPLING ALONG THE WARM
FRONT. OTHERWISE DRY WEATHER IS EXPECTED.

ON WEDNESDAY...A FRONTAL ZONE WILL DEVELOP ACROSS OHIO IN THE
WAKE OF THE CANADIAN LOW. THE SLOW MOVING EAST-WEST ORIENTED FRONT
WILL BE NEARLY PARALLEL TO THE UPPER FLOW. THIS PATTERN WILL
PROVIDE A GOOD CHANCE FOR SHOWERS AND THUNDERSTORMS TO DEVELOP NORTH
OF THE OHIO RIVER DURING WEDNESDAY AFTERNOON...IN AN ENVIRONMENT
OF WARM SURFACE TEMPS IN THE 80S AND THE RESULTANT UNSTABLE
AIRMASS.

SHOWERS AND THUNDERSTORMS WILL BECOME LIKELY WEDNESDAY NIGHT AS
THE FRONT SAGS SOUTH ACROSS THE AREA. DAY AND CMH MAY SEE MORE ACTIVITY
EARLY IN THE EVENING...WHILE ILN AND CVG COULD EXPERIENCE
CONVECTION LATER AT NIGHT.

&&

.LONG TERM /THURSDAY THROUGH MONDAY/...
BROAD BAND OF MID LEVEL WESTERLY FLOW TO DEVELOP ACROSS THE GREAT
LAKES/OHIO VALLEY. THIS WILL ALLOW A SURFACE FRONTAL BOUNDARY TO
STALL OUT IN AN  E-W ORIENTATION PARALLEL TO THE MID LEVEL FLOW
ALONG THE SRN PERIPHERY OF THE WESTERLIES. SOME OF THE DETAILS...
SUCH AS EXACTLY WHERE THE FRONT STALLS OUT AND WHEN IT OSCILLATES
NORTH AND SOUTH HAVE BEEN UNCERTAIN DUE TO SPREAD IN THE NUMERICAL
MODEL SOLNS.

HAVE LOOKED FOR CONTINUITY AND FAVOR A CONSENSUS SOLN. LATEST
EVIDENCE WOULD SUGGEST THAT THE FRONT STALLS OUT ACRS CENTRAL OHIO
ON THURSDAY. AN EMBEDDED SRN S/W MOVING THRU THE REGION...ALONG WITH
INSTBY SHOULD ENHANCE THUNDERSTORM CHANCES THURSDAY ALONG AND SOUTH
OF THE FRONT. HAVE BUMPED UP POPS HERE INTO LIKELY CATEGORY. EXPECT
TEMPERATURES SLIGHTLY ABOVE NORMAL WITH THURSDAYS HIGHS GENERALLY IN
THE MID AND UPR 70S.

SFC FRONTAL BOUNDARY TO SAG A LITTLE SOUTH THURSDAY NIGHT ALLOWING
FOR DIMINISHING CHANCES FOR RAIN ACRS THE NORTH AS SFC HIGH PRESSURE
BUILDS ACRS THE GREAT LAKES. WILL ALLOW POPS TO DIMINISH ACRS THE FAR
NORTH AND DECREASE POPS TO LOW CHANCE IN THE SOUTH.

WITH THE FRONTAL BOUNDARY CLOSE TO THE OHIO RIVER WILL CONTINUE
CHANCE POPS SOUTH AND ONLY SLIGHT CHC POPS NORTH ON FRIDAY.
TEMPERATURES WILL CONTINUE TO BE A ABOVE NORMAL...RANGING FROM THE
MID 70S NORTH TO THE UPPER 70S SOUTH.

A GENERAL LULL IN PRECIPITATION ACTIVITY IS EXPECTED FRIDAY NIGHT.
WILL ONLY CARRY SLIGHT CHC ACRS THE SOUTH EARLY AND THEN END ALL POPS
OVERNIGHT. THE FRONT LOOKS TO NUDGE A LTL NORTH ON SATURDAY WITH MID
LEVEL RIDGE BUILDING. WILL ONLY CARRY SLIGHT CHC DURG THE AFTN INTO
THE EVENING HOURS. HIGHS A LTL WARMER ON SATURDAY...RANGING FROM THE
UPPER 70S NORTH TO AROUND 80 SOUTH.

PROGRESSIVE MID LEVEL TROF TO MOVE INTO THE NATIONS MID SECTION
SUNDAY AND THE UPR MS VLY MONDAY. FRONT EXPECTED TO LIFT NORTH OF
ILN FA WITH THE REGION IN THE WARM SECTOR. BEST MOISTURE AND
FORCING TO OUR NORTH AND WEST SUNDAY. WILL ONLY CARRY SLIGHT CHC
POPS ACRS THE FAR NORTH IN THE AFTN. TEMPERATURES WILL CONTINUE TO
WARM WITH HIGHS FROM 80 NORTH TO THE LOWER 80S SOUTH.

WILL ALLOW CHC POPS TO OVERSPREAD THE FA FROM THE WEST MONDAY AS THE
FLOW BACKS HAD OF THE DEEP PROGRESSIVE MID LEVEL TROF. DUE TO CLOUDS
AND PRECIP HAVE TEMPS BACK IN THE MID AND UPPER 70S FOR HIGHS
MONDAY.

&&

.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
DEEP UPPER LEVEL TROUGH TO OUR EAST WILL CONTINUE TO PUSH EAST
TONIGHT AS MID LEVEL RIDGING DEVELOPS NORTHEAST INTO THE CENTRAL
PLAINS. THIS TRANSITION WILL BE REFLECTED AT THE SURFACE WITH A
RIDGE OF HIGH PRESSURE MOVING EAST ACROSS OUR REGION FOLLOWED BY A
DEVELOPING WARM FRONT ACROSS THE NORTHERN AND CENTRAL PLAINS.

ON TUESDAY...SURFACE LOW PRESSURE WILL PUSH EAST ACROSS SOUTH
CENTRAL CANADA AS MID LEVEL RIDGING CONTINUES TO BULGE EASTWARD
INTO THE OHIO VALLEY. AFOREMENTIONED WARM FRONT FROM THE LOW WILL
LIFT NORTHEAST THROUGH OUR AREA TUESDAY INTO TUESDAY NIGHT.

ALL IN ALL...MAINLY AN INCREASE IN CLOUDS DURING THE TAF PERIOD
WITH MID AND HIGH LEVEL MOISTURE SPILLING SOUTHEAST OF MID LEVEL
RIDGE TONIGHT. MOISTURE BECOMES A LITTLE BETTER ON TUESDAY AHEAD
OF THE WARM FRONT...BUT CEILINGS ARE EXPECTED TO REMAIN VFR. AT
THIS TIME...ANY PRECIPITATION DEVELOPMENT ALONG AND NORTHEAST OF
THE WARM FRONT IS EXPECTED TO STAY MAINLY NORTH AND NORTHEAST OF
THE TAF SITES. WINDS WILL INCREASE FROM THE SOUTH OVERNIGHT AND
TUESDAY AS THE SURFACE PRESSURE GRADIENT TIGHTENS. SOME GUSTS
BETWEEN 20 AND 25 KNOTS WILL BE POSSIBLE FROM LATE TUESDAY
MORNING INTO TUESDAY AFTERNOON.

OUTLOOK...THUNDERSTORMS POSSIBLE FROM LATE WEDNESDAY AFTERNOON
THROUGH FRIDAY.

&&

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

&&

$$
SYNOPSIS...CONIGLIO
NEAR TERM...CONIGLIO
SHORT TERM...CONIGLIO
LONG TERM...AR
AVIATION...HICKMAN