Area Forecast Discussion
Issued by NWS Cleveland, OH

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000
FXUS61 KCLE 011357
AFDCLE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CLEVELAND OH
957 AM EDT MON SEP 1 2014

.SYNOPSIS...
SOUTHERLY FLOW WILL BE IN PLACE TODAY AHEAD OF LOW PRESSURE
MOVING INTO THE WESTERN GREAT LAKES. THIS SYSTEM WILL TRACK NORTH
OF THE LAKES OVERNIGHT WITH A COLD FRONT SINKING SOUTH ACROSS THE
AREA ON TUESDAY. HIGH PRESSURE WILL BUILD IN BEHIND THE FRONT FOR
THE MID-WEEK PERIOD.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
AREA OF SHOWERS CONTINUE TO MOVE EAST INTO THE FORECAST AREA AT
THIS TIME. LATEST SPC ANALYSIS SHOWS FAIRLY GOOD CAPE DEVELOPING
AND NO CIN SO THE ACTIVITY SHOULD CONTINUE TO MOVE EAST INTO THE
REGION. WILL UPDATE TO INCLUDE THE SHOWERS.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY NIGHT/...
SHORTWAVE ENERGY PASSING TO THE NW THIS EVENING WILL PUSH THE AXIS
OF DEEP MOISTURE SOUTH OVER NRN OHIO. COVERAGE OF SHOWERS AND
THUNDERSTORMS AND THE AMOUNT OF RAIN WILL BE DEPENDENT ON
EVOLUTION OF CONVECTION FROM THIS AFTERNOON INTO TONIGHT.
EXPECTING TO SEE GOOD COVERAGE OF SHOWERS AND THUNDERSTORMS
ACROSS THE AREA AS SHORTWAVE ENERGY INTERACTS WITH THE DEEP
MOISTURE AXIS OVERHEAD. HOWEVER COULD SEE A POSSIBLE SCENARIO
WHERE THUNDERSTORMS THIS AFTERNOON FAVOR A TRACK TO THE SOUTH INTO
THE BETTER INSTABILITY...DISRUPTING THE MOISTURE TRANSPORT AND
ACTIVITY ALONG THIS BOUNDARY SO WILL HAVE TO MONITOR CONVECTIVE
TRENDS THROUGH THE DAY. LEFT POPS AT 60-80 PERCENT INSTEAD OF
GOING HIGHER GIVEN THIS UNCERTAINTY. THE AIR MASS WILL BE MOIST
WITH PW VALUES NEAR 2 INCHES. SOME THUNDERSTORMS TONIGHT COULD
PRODUCE HEAVY RAINFALL...MAINLY IN THE WEST HALF OF THE AREA WITH
STORM MOTION PARALLEL TO THE MEAN FLOW.

WILL ALLOW LIKELY POPS TO LINGER FOR MUCH OF THE AREA AS THE FRONT
SINKS SOUTH ON TUESDAY. DRIER AIR SHOULD ARRIVE FROM THE NW BY LATE
AFTERNOON...BRINGING AN END TO SHOWERS. HIGH TEMPERATURES ON TUESDAY
WILL BE SUPPRESSED BY CLOUDS AND SHOWERS SO HIGHS WILL BE CLOSER TO
80...EXCEPT IN NW OHIO WHERE CLOUDS MAY START TO BREAK OUT DURING
THE AFTERNOON ALLOWING TEMPS TO CLIMB A FEW DEGREES WARMER.

HIGH PRESSURE BUILDS IN BEHIND THIS SYSTEM BRINGING DRY WEATHER AND
LOWER HUMIDITY BY WEDNESDAY. TEMPERATURES WILL RANGE FROM THE UPPER
70S TO LOW 80S. THE HIGH BUILDS TO THE EAST ON THURSDAY AS THE NEXT
LOW TRACKS OUT OF THE PLAINS TOWARDS THE MIDWEST.

&&

.LONG TERM /FRIDAY THROUGH SUNDAY/...
THE LONG TERM BEGINS ON FRIDAY WITH LOW PRESSURE MOVING EAST ACROSS
THE SOUTHERN TIP OF JAMES BAY WITH A COLD FRONT SOUTHWEST ACROSS THE
CENTRAL GREAT LAKES TO THE SOUTHERN PLAINS. HIGH PRESSURE WILL BE IN
THE DAKOTAS. MODELS BRING THE COLD FRONT THROUGH THE AREA FRIDAY
EVENING/FRIDAY NIGHT ALTHOUGH THE ECMWF LAGS MOISTURE THROUGH THE
NIGHT WHILE THE GFS MOVES DRY AIR INTO NWRN OHIO BY SATURDAY
MORNING.  ECMWF TIMING WOULD HOLD A CHANCE OF SHOWERS AND
THUNDERSTORMS ACROSS THE AREA SATURDAY MORNING WHILE THE GFS WOULD
SUGGEST MAINLY DRY.  FOR NOW WILL GO WITH THE ECMWF TIMING OF THE
MOISTURE AND HOLD ONTO A CHANCE POP SATURDAY MORNING WITH HIGH
PRESSURE AND DRIER AIR MOVING IN THROUGH THE AFTERNOON. HIGH
PRESSURE BUILDS IN FURTHER SATURDAY NIGHT AND EARLY SUNDAY BEFORE
DRIFTING EAST SUNDAY NIGHT AND MONDAY.  BEST CHANCE OF PRECIP
THROUGH THE EXTENDED WILL BE FRIDAY NIGHT AND WILL HAVE LIKELY POPS.
TEMPS ABOVE NORMAL FRIDAY FALLING TO NEAR TO BELOW SATURDAY AND
SUNDAY...BUT STILL HIGHS SHOULD REACH THE 70S.

&&

.AVIATION /12Z MONDAY THROUGH FRIDAY/...
WIDESPREAD IFR CIGS ACROSS THE AREA UNDER A STRATUS DECK.
STILL...VFR REMAINED AT KERI NEAR THE LAKE...AS WELL AS KFDY AND
KTOL HOWEVER THE STRATUS DECK WAS MOVING NORTH AND WILL LIKELY
MOVE INTO KFDY/KTOL AND KCLE. DOWN SLOPE FLOW IS HELPING KERI AND
WILL LIKELY KEEP IFR TO THEIR SOUTH. KCLE IS ON THE EDGE.
EXPECTING THE STRATUS DECK TO LAST WELL INTO THE MORNING BEFORE
THINNING/BREAKING WITH SOME AREAS SOUTH/SOUTHEAST NOT BREAKING UNTIL
THE AFTERNOON. COULD SEE SCATTERED CONVECTION INTO THE WEST LATE
AFTERNOON AND INTO THE EVENING AS CAPES APPROACH 2000 J/KG BUT FOR
NOW WILL JUST HAVE VCTS. EXPECT MORE SHOWERS AND THUNDERSTORMS
OVERNIGHT AS IMPULSE MOVES IN.

OUTLOOK...NON VFR LIKELY AT TIMES IN SHOWERS AND THUNDERSTORMS
TUESDAY.

&&

.MARINE...
EXPECTING PRIMARILY SOUTHWEST FLOW ON THE LAKE TODAY AND EARLY
TUESDAY FOLLOWED BY A TRANSITION TO MAINLY WEST DURING THE DAY
TUESDAY BEHIND A WEAK COLD FRONT. LOOK FOR LIGHT SOUTHWEST FLOW
WEDNESDAY WITH HIGH PRESSURE OVER THE LAKE. THURSDAY ITS BACK TO
SOUTHWEST AS LOW PRESSURE DEVELOPS IN THE WESTERN LAKES AND HIGH
PRESSURE MOVES TO THE MID ATLANTIC COAST. FRIDAY EXPECT A COLD FRONT
TO MOVE SOUTHWEST ACROSS THE LAKE DURING THE LATE AFTERNOON.
SOUTHWEST WINDS AHEAD OF THE FRONT WILL TURN WEST TO NORTHWEST IN
ITS WAKE. NO HEADLINES EXPECTED AT THIS TIME.

&&

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

&&

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





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