Area Forecast Discussion
Issued by NWS Cleveland, OH

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000
FXUS61 KCLE 050610
AFDCLE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CLEVELAND OH
210 AM EDT TUE MAY 5 2015

.SYNOPSIS...
A COLD FRONT WILL MOVE EAST ACROSS THE AREA THIS AFTERNOON AND
EVENING. THE FRONT IS EXPECTED TO BECOME NEARLY STATIONARY OVER
CENTRAL OHIO AND CENTRAL PENNSYLVANIA ON TUESDAY. THE FRONT WILL
THEN LIFT BACK NORTH AS A WARM FRONT WEDNESDAY. THE LOCAL AREA WILL
BE UNDER THE INFLUENCE OF HIGH PRESSURE OFF THE ATLANTIC COAST
THROUGH THE END OF THE WEEK.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
WARM FRONT LIFTING ACROSS OHIO HAS BUMPED DEW POINT INTO THE MID
50S TO LOWER 60S...SO LEFT CHANCE OF SHOWERS OR THUNDERSTORMS FOR
OVERNIGHT FORECAST. DONT THINK THERE WILL BE MUCH DROP IN TEMPS
SO TWEAKED OVERNIGHT TEMPS UP A COUPLE OF DEGREES..

ORIGINAL DISCUSSION...
COLD FRONT IS MAKING SLOW PROGRESS FROM WEST TO EAST. THE SHOWER
ACTIVITY AHEAD OF THE FRONT IS ENCOUNTERING A LOT OF DRY AIR AHEAD
OF THE PRECIPITATION. THIS IS HELPING TO REDUCE THE SHOWER POTENTIAL
ACROSS THE AREA EVEN THOUGH TEMPERATURES EXCEEDED THE CONVECTIVE
TEMPERATURE OF 74 DEGREES BY SEVERAL DEGREES. EXPECTING THE SHOWERS
TO MOVE EAST ACROSS THE AREA WITH QPF AMOUNTS AROUND A TENTH OF AN
INCH OR LESS THIS EVENING.  THE FRONT EVENTUALLY BEGINS TO STALL
JUST SOUTH OF THE LOCAL AREA BY MORNING. DUE TO THE CLOSE PROXIMITY
OF THE FRONT TO THE AREA...THERE IS THE POSSIBILITY FOR SOME SHOWERS
THROUGH THE NIGHT.  WINDS WILL BEGIN TO DIMINISH THIS EVENING AS THE
FRONT MOVES THROUGH THE AREA. COLD AIR ADVECTION ON THE NORTH SIDE
OF THE COLD FRONT WILL CAUSE TEMPERATURES TO DIP BACK INTO THE 50S
FOR LOWS NORTH. HOWEVER...SINCE SOUTHERN PORTIONS WILL TAKE THEIR
TIME IN GETTING INTO THE COLDER AIR...LOWS ONCE AGAIN WILL BE AROUND
60 OVERNIGHT.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH THURSDAY NIGHT/...
COLD FRONT BECOMES NEARLY STATIONARY JUST SOUTH OF THE FORECAST AREA
ON TUESDAY. THIS WILL SET UP A NORTHEASTERLY FLOW DOWN THE SPINE OF
LAKE ERIE INTO NORTHWEST OHIO. THIS WILL CAUSE COLD AIR ADVECTION
OFF THE LAKE AS COLD DOME OF AIR MOVES INLAND. TEMPERATURES WILL
LIKELY BE COOLER IN TOLEDO AND ALONG THE IMMEDIATE LAKE SHORE FOR
HIGHS ON TUESDAY. AWAY FROM THE LAKE...AIR MASS IS NOT ALL THAT
COLD SO WE SHOULD SEE TEMPERATURES REBOUNDING INTO THE LOWER AND
MIDDLE 70S. LAKE BREEZE WILL LIKELY DEVELOP ALONG THE LAKE SHORE AND
THIS WILL KEEP THE LAKE SHORE AREAS COOLER AS WELL.

AS STATIONARY FRONT LINGERS ACROSS THE AREA...THREAT FOR SOME
SHOWERS AND THUNDERSTORMS STILL POSSIBLE DURING THE DAY ON TUESDAY.
SO WILL KEEP A MENTION GOING THROUGH THE DAY. FINALLY...FRONT BEGINS
TO LIFT NORTH TUESDAY NIGHT INTO WEDNESDAY AND WE SHOULD SEE A
REBOUND IN TEMPERATURES BACK INTO THE 70S ACROSS THE ENTIRE FORECAST
AREA. ALTHOUGH...GRADIENT WILL BE WEAK AND LAKE BREEZE WILL LIKELY
DEVELOP AGAIN KNOCKING DOWN TEMPERATURES ALONG THE SHORE.

THE BEST SURGE OF WARM AIR TAKES PLACE ON THURSDAY AS SOUTHERLY FLOW
RESUMES IN THE WARM SECTOR THANKS TO HIGH PRESSURE SITTING OFF THE
ATLANTIC COAST. THIS WARM FLOW SHOULD KEEP TEMPERATURES ON THE MILD
SIDE THROUGH THURSDAY NIGHT.

THREATS FOR PRECIPITATION ARE MINIMIZED WEDNESDAY THROUGH THURSDAY
NIGHT AS MOISTURE LIFTS NORTH OF THE AREA.

&&

.LONG TERM /FRIDAY THROUGH MONDAY/...
THE LONG TERM BEGINS IN FRIDAY WITH THE GFS AND ECMWF IN DECENT
AGREEMENT SHOWING AN UPPER RIDGE ACROSS THE EASTERN GREAT LAKES INTO
PA WITH A TROF MOVING EAST THROUGH CENTRAL CANADA. AT THE
SURFACE...LOW PRESSURE WILL BE NEAR LAKE SUPERIOR WITH A COLD FRONT
SOUTHWEST INTO THE CENTRAL/SOUTHERN PLAINS. THIS WILL BE A MILD/WARM
PATTERN FOR NRN OHIO AND NWRN PA WITH SLY/SWLY FLOW OUT OF THE
MISSISSIPPI VALLEY INTO THE AREA.  MOISTURE ASSOCIATED WITH THIS
FLOW LOOKS BEST ACROSS NORTHWEST OHIO ON FRIDAY SO WILL PUT A SLIGHT
CHANCE IN THE GRIDS.  MESOSCALE FORCING COULD HELP AFTERNOON/EVENING
STORMS DEVELOP ALONG ANY LAKE BREEZE BUT FOR NOW WILL LEAVE OUT. NO
BIG CHANGES THROUGH SATURDAY MORNING.  SATURDAY AFTERNOON THE COLD
FRONT WILL MOVE EAST INTO MICHIGAN. MOISTURE CONTINUE TO INCREASE
ACROSS THE AREA AS THE UPPER RIDGE MOVES EAST.  WOULD EXPECT MORE
AFTERNOON/EVENING SHOWERS/STORMS ACROSS THE AREA AND WILL HAVE
CHANCE POPS FOR ALL.  MANUAL PROGS HAVE THE FRONT BECOMING MORE
EAST/WEST AND STALLING JUST TO OUR NORTH SATURDAY NIGHT AS LOW
PRESSURE DEVELOPS IN THE CENTRAL PLAINS. FRONT LIFTS A BIT NORTH FOR
SUNDAY INTO MONDAY AS THE LOW MOVES ENE. WILL HAVE CONTINUED CHANCE
POPS SATURDAY NIGHT THROUGH MONDAY FOR WHAT WILL LIKELY BE
INCREASING DIURNAL ACTIVITY. AFTERNOON TEMPS IN THE 70S TO LOWER
80S.

&&

.AVIATION /06Z TUESDAY THROUGH SATURDAY/...

VISIBILITIES HAVE BEEN DROPPING ACROSS THE AREA WITH FOG STARTING TO
DEVELOP WITH A MOIST BOUNDARY LAYER. SOME LOCATIONS ARE ALREADY DOWN
TO ONE QUARTER MILE VISIBILITY AND EXPECT TO SEE IFR VISIBILITIES
DEVELOP AT FDY/MFD/CAK/YNG. LESS CERTAIN ON HOW WIDESPREAD THE DENSE
FOG WILL BE BUT IT COULD BECOME EXPAND INTO THE SOUTHERN SITES.
CLE/YNG/ERI COULD SEE A MVFR VISIBILITIES FOR A FEW HOURS BUT SHOULD
IMPROVE AS THE FRONT OVER LAKE ERIE SAGS SOUTH BRINGING DRIER AIR.

AN AREA OF SHOWERS WITH A FEW THUNDERSTORMS EXTENDS FROM CENTRAL
OHIO WESTWARD TO LOW PRESSURE OVER IOWA. THIS BAND OF SHOWERS WILL
MOVE NORTHEAST WITH TIME AND TRIED TO TIME THE SHOWERS INTO THE NW
OHIO SITES TOWARDS 12Z. THE GREATEST COVERAGE OF SHOWERS IS EXPECTED
TO PASS TO THE NORTH BUT ANY SITE COULD SEE SHOWERS...ESPECIALLY
AFTER 18Z. DID NOT INCLUDE ANY THUNDERSTORMS AT THIS TIME AS
CONFIDENCE IS TOO LOW...BUT THUNDERSTORMS ARE POSSIBLE. LOW MVFR OR
IFR CEILINGS COULD DEVELOP AT TOL THIS AFTERNOON GIVEN THE COOL FLOW
OFF LAKE ERIE.

.OUTLOOK...EARLY MORNING BR POSSIBLE OVER THE NEXT SEVERAL DAYS. NON
VFR POSSIBLE IN SHOWERS AS A FRONT APPROACHES LATE SATURDAY.

&&

.MARINE...
MODELS SHOW A WEAK GRADIENT IN GENERAL FOR THE NEXT SEVERAL DAYS SO
AM EXPECTING WINDS FROM 10 TO 15 KNOTS OR LESS THROUGH THE PERIOD.
FOR TONIGHT SOUTHWEST FLOW WILL TURN NORTHEAST OVERNIGHT AS HIGH
PRESSURE MOVES THROUGH THE CENTRAL LAKES AND A COLD FRONT DROPS
ACROSS LAKE ERIE. EAST TO NORTHEAST FLOW WILL LAST INTO WEDNESDAY
NIGHT BEFORE THE FRONT LIFTS BACK ACROSS THE LAKE AS A WARM FRONT
TURNING WINDS SOUTHEAST. THURSDAY FRIDAY AND SATURDAY EXPECT SOUTH
TO SOUTHWEST FLOW WITH LOW PRESSURE TO OUR WEST.

&&

.CLE WATCHES/WARNINGS/ADVISORIES...
OH...NONE.
PA...NONE.
MARINE...NONE.

&&

$$
SYNOPSIS...LOMBARDY
NEAR TERM...DJB/LOMBARDY
SHORT TERM...LOMBARDY
LONG TERM...TK
AVIATION...KEC
MARINE...TK





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