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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KILN 160532
AFDILN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
132 AM EDT WED APR 16 2014

.SYNOPSIS...
SURFACE HIGH PRESSURE WILL MOVE OVER THE OHIO VALLEY
TONIGHT...BEGINNING TO MOVE EAST OF THE REGION TOMORROW. BY
THURSDAY...SOUTHERLY WINDS WILL ALLOW FOR A WARMING OF
TEMPERATURES THROUGH FRIDAY...WITH RAIN POSSIBLE BY FRIDAY
AFTERNOON.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
SATELLITE SHOWS THAT ONLY A FEW CLOUDS REMAIN IN CENTRAL OHIO AND
THESE SHOULD DISSIPATE SOON. WINDS CONTINUE TO DROP OFF. THEY WILL
BECOME LIGHT AND VARIABLE AS THE CENTER OF HIGH PRESSURE MOVES
ACROSS THE AREA. FORECAST LOOKS ON TRACK WITH NEAR RECORD LOW
MINIMA.

RECORDS LOWS FOR APRIL 16
CMH 22 DEGREES IN 1962/1935
CVG 24 DEGREES IN 1875
DAY 23 DEGREES IN 1962

WIDESPREAD FROST WILL OCCUR AND THE FREEZE WARNING REMAINS IN
EFFECT.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH THURSDAY NIGHT/...
ON WEDNESDAY...THE CENTER OF THE SURFACE HIGH WILL CONTINUE TO
MOVE AWAY FROM THE ILN CWA...IN A GENERALLY-NORTHEAST DIRECTION
TOWARD NEW ENGLAND. WITH SURFACE LOW PRESSURE OVER THE NORTHERN
PLAINS...THIS WILL SUPPORT A SURFACE FLOW PATTERN THAT ALLOWS
WINDS TO SHIFT TO THE SOUTHEAST ON WEDNESDAY...AND TO THE SOUTH ON
THURSDAY.

THE WARM ADVECTION THROUGH THE LOWEST FEW THOUSAND FEET WILL NOT
BE ALL THAT STRONG ON WEDNESDAY...BUT THE AIR MASS WILL BE
CHANGING ENOUGH TO WARRANT A SIGNIFICANT BUMP IN SURFACE
TEMPERATURES...ESPECIALLY WITH SUN AND MIXING (THROUGH AROUND
850MB) EXPECTED. ON WEDNESDAY NIGHT...THOUGH WARM ADVECTION NEAR
900MB WILL INCREASE...CLEAR SKIES WILL ALLOW FOR RELATIVELY
FAVORABLE RADIATIONAL COOLING. FREEZING CONDITIONS APPEAR
GENERALLY UNLIKELY...AND FROST POTENTIAL IS IN QUESTION...WITH DRY
AIR AND SOME WIND REMAINING IN PLACE. SOME FROST WAS ADDED TO THE
GRIDS...BUT CONFIDENCE IS NOT YET HIGH ENOUGH TO INCLUDE IN THE
HWO OR CONSIDER ISSUING A HEADLINE.

THE SOUTHERLY FLOW ON THURSDAY WILL SUPPORT WARMER
CONDITIONS...WITH THE ENTIRE CWA GETTING INTO THE 60S. THOUGH A
FEW CUMULUS CLOUDS ARE NOT OUT OF THE QUESTION...IN GENERAL ONLY
SOME PATCHES OR STREAKS OF CIRRUS/CIRROSTRATUS ARE EXPECTED. LATE
ON THURSDAY NIGHT...A MORE SIGNIFICANT INCREASE IN CLOUD COVER IS
EXPECTED. MOISTURE ADVECTION OVER THE OHIO VALLEY WILL PICK UP IN
STRENGTH...IN ADVANCE OF A RATHER LARGE TROUGH THAT WILL BE MOVING
TO THE EAST OUT OF THE MISSISSIPPI VALLEY. HOWEVER...CHANCES FOR
PRECIPITATION APPEAR LIKELY TO WAIT UNTIL FRIDAY MORNING.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
DRY CONDITIONS AT THE START OF THE LONG TERM WILL BE SHORT LIVED.
AN UPPER LEVEL DISTURBANCE WILL WORK INTO THE AREA ON FRIDAY AND
INTO FRIDAY NIGHT.  THERE IS SOME LIMITED INSTABILITY DURING THE DAY
AND THEREFORE HAVE A CHANCE OF THUNDER IN THE FORECAST AS WELL.
PRECIPITATION WILL TAPER OFF BY SATURDAY MORNING.

HIGH PRESSURE AND DRY CONDITIONS WILL BE IN PLACE FOR THE REMAINDER
OF THE WEEKEND.  THE MODELS ARE IN AGREEMENT WITH BRINGING ANOTHER
SYSTEM INTO THE AREA MONDAY INTO MONDAY NIGHT.  THE ECMWF IS MORE
ROBUST WITH THIS SYSTEM THAN THE GFS.  AT THIS POINT WENT WITH A
MODEL BLEND HOWEVER LIMITED PRECIPITATION CHANCES TO THE CHANCE
CATEGORY DUE TO UNCERTAINTY AND MODEL VARIABILITY.  THERE IS AGAIN
SOME LIMITED INSTABILITY DURING THE DAY ON MONDAY AND HAVE A CHANCE
OF THUNDER MENTIONED.  THIS SYSTEM WILL MOVE OUT OF THE AREA TUESDAY
MORNING.  HIGH PRESSURE WILL THEN MOVE INTO THE REGION BY THE END OF
THE LONG TERM.

&&

.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
-- Changed Discussion --
SURFACE HIGH PRESSURE WILL SLIDE OFF TO THE EAST THROUGH TONIGHT.
AS WE GET ON THE BACK SIDE OF THE HIGH...JUST EXPECT TO JUST SEE A
GRADUAL INCREASE IN HIGH LEVEL CLOUDS TROUGH THE TAF PERIOD.

OUTLOOK...MVFR CEILINGS POSSIBLE FRIDAY INTO FRIDAY NIGHT.
-- End Changed Discussion --

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
OH...FREEZE WARNING UNTIL NOON EDT TODAY FOR OHZ077>082-088.
KY...FREEZE WARNING UNTIL NOON EDT TODAY FOR KYZ089>100.
IN...FREEZE WARNING UNTIL NOON EDT TODAY FOR INZ073>075-080.
-- End Changed Discussion --

&&

$$
SYNOPSIS...HATZOS
NEAR TERM...
SHORT TERM...HATZOS
LONG TERM...NOVAK
AVIATION...JGL