FXUS61 KILN 272201
AFDILN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
453 PM EST FRI NOV 27 2009

.SYNOPSIS...
HIGH PRESSURE WILL BUILD INTO THE REGION TONIGHT AND WILL CONTROL 
THE REGIONS WEATHER INTO EARLY SUNDAY. A COLD FRONT WILL MOVE INTO 
THE OHIO VALLEY BRINGING THE NIGHT CHANCE OF RAIN ON SUNDAY AND 
SUNDAY NIGHT.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
HIGHLY AMPLIFIED UPPER LEVEL FLOW PATTERN WITH LOW PRESSURE OVER
THE EASTERN GREAT LAKES SHIFTING EAST AS LARGE RIDGE BEGINS TO 
BUILD EAST FROM THE NATIONS MID SECTION. SFC RIDGE TO BEGIN BUILDING
IN THIS EVENING. WITH LOW LEVEL FLOW TRANSITIONING FROM CYCLONIC TO
ANTI-CYCLONIC EXPECT CLDS TO CLEAR FROM THE SOUTHWEST. WITH CLEARING
SKIES AND LIGHT WINDS HAVE TRENDED OVERNIGHT LOWS ON THE COOL SIDE
OF GUIDANCE ENVELOPE.

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY NIGHT/...
IN AMPLIFIED SPLIT LEVEL FLOW PATTERN UPPER LEVEL RIDGING WL BUILD
OVER THE REGION ON SATURDAY. EXPECT TO SEE A GOOD AMOUNT OF SUNSHINE
WITH MODERATING TEMPERATURES. HAVE TRENDED SATURDAYS HIGHS CLOSER
TO COOLER MAV NUMBERS.

THE FLOW BACKS WITH AN INCREASE IN CLOUDS LATE SATURDAY NIGHT INTO
SUNDAY. HAVE TRENDED SAT NIGHTS LOWS A LTL COOLER THAN GUID BASED
ON EXPECTED SLOWER ONSET OF CLDS.

WEAK ISENTROPIC LIFT DEVELOPS AHEAD OF AN APPROACHING COLD FRONT
ON SUNDAY. NUMERICAL MODEL SOLN/S A LTL SLOWER AND THEREFORE HAVE
SPREAD CHC POPS FOR SHOWERS INTO THE NW SUNDAY AFTN AND THEN INCREASE
POPS TO LIKELY OVERNIGHT SUNDAY. HAVE ENDED POPS FROM THE NW
MONDAY IN THE WAKE OF THE FRONT. SFC HIGH PRESSURE TO RESULT IN
DRY WEATHER MONDAY NIGHT. 

HAVE TRENDED SUNDAYS HIGHS A LTL BELOW GUID DUE TO CLDS AND PRECIP
AND SLIGHT ABOVE SUNDAY NIGHT. 

&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...
IN SPLIT UPPER LEVEL FLOW PATTERN CONFLUENCE OVER THE REGION 
RESULTING IN SFC RIDGING. THIS WILL PROVIDE GENERALLY DRY WEATHER 
TUESDAY INTO EARLY WEDNESDAY. 

SRN STREAM SYSTEM TO EJECT FROM THE GULF STATES NE INTO THE OHIO VLY 
AND MERGE WITH THE NORTHERN STREAM AS A BROAD TROF DEVELOPS ACROSS 
THE GREAT LAKES. LATEST GFS SOLN KEEPS THIS SYSTEM FAR TO OUR EAST 
WHILE THE MORE CONSISTENT ECMWF AND ENSEMBLES BRING IT INTO THE OHIO 
VALLEY. WL FOLLOW THESE SOLN/S SPREADING CHC POPS FOR RAIN SHOWERS 
FROM THE SOUTH WEDNESDAY AFTN. WL CONT CHC POPS INTO THURSDAY MORNING
WHEN A COLD FRONT IS EXPECTED TO PASS THRU. 

WITH BROAD TROF UPR LEVEL ACRS THE GREAT LAKES...SFC HIGH PRESSURE
EXPECTED TO NOSE INTO THE TN VLY LATER THURSDAY INTO FRIDAY. HAVE 
MAINTAINED A DRY FCST THRU THE END OF THE WEEK WITH TEMPS BELOW
NORMAL. 

&&

.AVIATION /21Z FRIDAY THROUGH WEDNESDAY/...
CLOUDS LINGERING IN CAA BEHIND TROUGH. SOME MVFR CEILINGS BUT
SLOWLY RISING HEIGHTS. DRYING SHOULD BEGIN CLEARING THIS EVENING
WITH HIGH PRESSURE BUILDING IN THROUGH TAF PERIOD. WINDS LESSEN AS
GRADIENT RELAXES THIS EVENING. SOME BRIEF FOG NEAR SUNRISE AT LUK
BUT NOT INCLUDED SINCE IT SHOULD NOT BE WORSE THAN BRIEF MVFR VSBY.
HIGH SHIFTS EAST SATURDAY WITH ONLY HIGH CLOUDS EXPECTED. CONTINUED

OUTLOOK...MVFR CIGS AND VSBYS POSSIBLE SUNDAY NIGHT/MONDAY.

&&

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

&&

$$
SYNOPSIS...AR
NEAR TERM...AR
SHORT TERM...AR
LONG TERM...AR
AVIATION...MP