Area Forecast Discussion
Issued by NWS Wilmington, OH

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000
FXUS61 KILN 271037
AFDILN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
637 AM EDT WED MAY 27 2015

.SYNOPSIS...
A WEAK COLD FRONT WILL MOVE SOUTHEAST INTO THE REGION THIS
AFTERNOON AND THIS EVENING. THE FRONT WILL SETTLE ALONG THE OHIO
RIVER TONIGHT...BECOMING POORLY DEFINED NEAR THE OHIO RIVER ON
THURSDAY. MEANWHILE...HIGH PRESSURE WILL BUILD INTO THE SOUTHERN
GREAT LAKES ON THURSDAY. THE HIGH WILL MOVE OFF TO THE EAST
FRIDAY....ALLOWING FOR A RETURN OF HUMID AIR NORTHWARD. THE NEXT
SIGNIFICANT WEATHER MAKER WILL OCCUR OVER THE WEEKEND WHEN A
STRONGER COLD FRONT PUSHES INTO THE REGION.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
FIRST CONCERN THIS MORNING IS THE DEVELOPMENT OF STRATUS OVER THE
EASTERN TWO THIRDS OF THE CWFA. MODELS SUGGEST THAT THE STRATUS
MAY TRY TO MOVE A LITTLE EAST TOWARD SUNRISE. IN EITHER
CASE...ONCE THE SUN COMES UP...ANY REMAINING STRATUS SHOULD THIN
AND MIX OUT THROUGH THE MID MORNING HOURS.

FOR LATER TODAY...FOCUS SHIFTS TOWARD A MID LEVEL S/WV WHICH IS
FORECAST TO MOVE ACRS THE GREAT LAKES THIS AFTERNOON AND TONIGHT.
AN ATTENDANT WEAK COLD FRONT WILL ALSO MAKE IN ROADS INTO OUR
REGION FROM THE WEST THIS AFTERNOON. IT LOOKS LIKE WE SHOULD
ACHIEVE MODERATE MLCAPES AROUND 1500 J/KG DURING PEAK HEATING. IN
ADDITION...SOME LOW END MODERATE SHEAR WILL ACCOMPANY THE FRONT.
THIS SHOULD GIVE SOME ORGANIZATION TO THUNDERSTORMS DEVELOPING
ALONG AND JUST AHEAD OF THE FRONT. BEST CHANCE FOR PCPN BASED ON
THE FRONT ENTERING OUR NWRN ZONES AND LIFT FROM THE S/WV WOULD BE
IN OUR NW. HOWEVER...SOME HIGH RESOLUTION MODELS/CAMS ARE THROWING A
CURVE BALL IN THAT THERE MAY BE A PREFRONTAL TROF ENTERING THE
REMAINDER OF THE NE TO SW CWFA AHEAD OF THE FRONT...ALONG WITH
THE POTENTIAL FOR AN MCV (FROM UPSTREAM CONVECTION NOW PUSHING
TOWARD THE LOWER OHIO RIVER VALLEY) TO MOVE INTO THE TRI-STATE REGION.
IF THIS OCCURS...THEN POPS MAY NEED TO BE RAISED FOR THE TRI-STATE
REGION AND POSSIBLY POINTS DOWNSTREAM LATE THIS AFTN INTO THIS
EVENING. GIVEN THAT THIS IS A BIG UNCERTAINTY...WILL GO WITH
LIKELY POPS IN THE NW WHERE AGREEMENT IS HIGH FOR THE BEST
DYNAMICS AND 30 TO 40 POPS TOWARD THE TRI- STATE REGION. THE
LOWEST POPS WILL BE IN OUR FAR SE ZONES. THERE IS THE POTENTIAL
FOR SCATTERED SEVERE STORMS THIS AFTERNOON AND SPC HAS DILIGENTLY
PLACED A GOOD PART OF OUR CWFA IN A SLIGHT RISK FOR SEVERE STORMS.
GIVEN INSTABILITY AND SHEAR...DAMAGING WINDS AND LARGE HAIL ARE
BOTH SEVERE WEATHER THREATS. IT WILL BE WARM AND MODESTLY HUMID WITH
HIGHS IN THE LOWER TO MID 80S.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/...
HAVE USED A BLEND OF THE 00Z NAM AND 00Z ECMWF FOR TONIGHT INTO
THURSDAY NIGHT. THEREAFTER...A BLEND OF THE 00Z ECMWF AND THE
PREVIOUS FORECAST HAS BEEN EMPLOYED.

AS MID LEVEL S/WV EXITS TO THE EAST THIS EVENING...TRAILING WEAK
COLD FRONT WILL SLOWLY MOVE SOUTH TOWARD THE OHIO RIVER. ONGOING
CONVECTION EARLY ON WILL SHIFT TO THE EAST AND SOUTHEAST...WANING
IN COVERAGE OVERNIGHT AS UPPER SUPPORT MOVES AWAY...INSTABILITY
DECREASES...AND THE FRONT BECOMES MORE DIFFUSE. WE SHOULD SEE SOME
CLEARING ACROSS THE NORTH WITH A LITTLE MORE DRIER AIR WORKING
INTO THIS AREA WHILE POINTS ALONG AND SOUTH OF THE REMAIN REMAIN
ON THE MUGGY SIDE. LOWS WILL RANGE FROM THE UPPER 50S NW TO THE
MID 60S ALONG AND SOUTH OF THE OHIO RIVER.

FOR THURSDAY...HIGH PRESSURE AT THE SURFACE AND ALOFT WILL BUILD
ACROSS THE SOUTHERN GREAT LAKES. MEANWHILE...THE ILL DEFINED
FRONTAL BOUNDARY WILL TRY TO INCH ITS WAY BACK TO THE NORTH LATE
IN THE DAY AS THE SURFACE HIGH BEGINS TO SHIFT EAST. GIVEN THE WEAK
FORCING AND INSTABILITY IN THE VICINITY OF THE WEAK BOUNDARY...WILL
MAINTAIN LOW CHANCE POPS ACROSS THE SOUTH WHILE THE NORTH REMAINS
DRY. UNDER MOSTLY SUNNY TO PARTLY CLOUDY SKIES...HIGHS WILL ONCE
AGAIN PEAK INTO THE LOWER AND MID 80S.

FOR THURSDAY NIGHT...HIGH PRESSURE AT THE SURFACE AND ALOFT WILL
MOVE OFF TO THE EAST. THIS WILL ALLOW A RETURN FLOW TO SET UP.
MOST MODELS ALLOW SLIGHT CHANCE OF DIURNALLY DRIVEN SHOWERS/STORMS
TO DISSIPATE TOWARD SUNSET AND HAVE GONE WITH THIS SOLUTION ATTM.
UNDER PARTLY CLOUDY SKIES...LOWS WILL FALL INTO THE LOWER AND MID 60S.

FOR FRIDAY INTO FRIDAY NIGHT...INCREASING MOIST RETURN FLOW WILL
BRING HUMID CONDITIONS BACK TO THE ENTIRE REGION. FORECAST AREA
WILL BE BETWEEN AN MID LVL RIDGE NEAR THE MID ATLANTIC REGION AND
A MID LEVEL TROUGH ADVANCING EAST/SOUTHEAST TOWARD OUR AREA. GIVEN
LACK OF ANY WELL DEFINED DISTURBANCES AT THIS TIME...HAVE
MAINTAINED A CHANCE OF SHOWERS/STORMS THROUGH THE PERIOD. AS
STATE...WARM AND HUMID CONDITIONS WILL PREVAIL.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
AN UNSETTLED PATTERN IS FORECAST TO PERSIST THROUGH THE PERIOD.

ORGANIZED AND WIDESPREAD CONVECTION WILL BE POSSIBLE SATURDAY
THROUGH MONDAY WHEN A SLOW MOVING FRONTAL BOUNDARY IS PUSHED
SOUTHEASTWARD TO ILN BY A BROAD UPPER TROUGH. THE CHANCE FOR
THUNDERSTORMS WILL PERSIST OVER PARTS OF THE AREA ON TUESDAY WHEN
THE FRONTAL BOUNDARY IS PROGGED TO LINGER TO THE SOUTH.

WARM CONDITIONS WITH HIGHS IN THE 80S ARE IN STORE FOR SATURDAY
IN A SOUTHERLY FLOW AHEAD OF THE FRONT. READINGS IN THE 70S ARE
EXPECTED SUNDAY THROUGH TUESDAY IN THE COOLER AIRMASS BEHIND THE
FRONT.

&&

.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
STRATUS CLOUDS HAVE ALREADY BEGUN TO LIFT AND DISSIPATE...WITH
SCATTERED PATCHES OF MVFR STILL AFFECTING THE TAF SITES THIS
MORNING. THESE CLOUDS WILL GIVE WAY TO VFR CONDITIONS BY 15Z...AS
SOUTHWESTERLY WINDS GUST INTO THE 20-25 KNOT RANGE. THE CHANCE FOR
SHOWERS AND THUNDERSTORMS WILL RETURN DURING THE AFTERNOON HOURS.
THE EXACT TIMING FOR THIS ACTIVITY REMAINS SLIGHTLY
UNCERTAIN...BUT THE 4PM-8PM TIME FRAME WILL PROBABLY BE THE MOST
LIKELY SCENARIO...SO A VCTS HAS BEEN USED FOR THIS BLOCK OF TIME.
MVFR/IFR CONDITIONS WILL BE POSSIBLE IF THUNDERSTORMS MOVE OVER
THE TAF SITES.

CLEARING CONDITIONS CAN BE EXPECTED FOR WEDNESDAY NIGHT. THERE
APPEARS TO BE SOME POTENTIAL FOR FOG DEVELOPMENT AS WINDS BECOME
FAIRLY CALM...THOUGH THIS WILL BE GREATEST AT THE CINCINNATI TAF
SITES AND FURTHER SOUTH...WHERE MOISTURE CONTENT IN THE AIR WILL
REMAIN HIGHER.

OUTLOOK...THUNDERSTORMS WILL BE POSSIBLE ON OCCASION FROM FRIDAY
EVENING THROUGH SUNDAY.

&&

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

&&

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






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