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September 2013 Observations And Discussions


sutherlandfan

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At 7 am, the temperature had fallen to 47° in NYC's Central Park. That is the first time the temperature has fallen below 50° in NYC during September since September 30, 2009 when the temperature fell to 49°. It is also the earliest sub-50° reading since September 24, 1998 when the mercury fell to 49°. The last time the temperature was at least as cool in September occurred on September 29, 2000 when the temperature fell to 43°. The last time it was at least as cool in September this early in the month was September 20, 1993 when the temperature dipped to 44°.

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CMC has the feature as well.. but's that's not saying much.

 

OKX mentions it in their morning AFD:

 

ON MONDAY...AN UPPER LEVEL TROUGH AND COLD FRONT WILL APPROACH FROM

THE WEST. MEANWHILE...ECMWF IS HINTING AT A COASTAL LOW DEVELOPING

AND IMPACTING THE REGION SOMETIME IN THE LATE SUNDAY THROUGH TUESDAY

TIME FRAME. THE 00Z GFS ALSO HAS A COASTAL LOW DEVELOPING...HOWEVER

THE GFS KEEPS THE LOW FAR ENOUGH EAST...WHERE IT WONT IMPACT THE

REGION. FOR NOW...WILL JUST HAVE SLIGHT CHANCE OR CHANCE POPS MONDAY

AND MONDAY NIGHT.

 

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From Taunton:

 

CONFIDENCE LEVEL/MODEL GUIDANCE...
HIGH CONFIDENCE IN THE FORECAST OF THE MEDIUM RANGE...WITH A LOW
CONFIDENCE IN THE EXTENDED. 00Z MODEL GUIDANCE IS IN GOOD
AGREEMENT FOR THE REMAINDER OF THE WORK WEEK SHOWING DRY AND HIGH
PRESSURE DOMINATING OVER NEW ENGLAND. HOWEVER STARTING EARLY NEXT
WEEK...MODELS DIVERGE SIGNIFICANTLY. THERE SEEMS TO BE TWO
DIFFERENT CAMPS...THE EC/CANADIAN AND THE GFS/UKMET/ECENS. THE
EC/CANADIAN SHOWS A PRETTY STRONG COASTAL LOW WITH SOME TROPICAL
CHARACTERISTICS MOVING UP THE EASTERN SEABOARD ON SUNDAY AND
IMPACTING SOUTHERN NEW ENGLAND LATE SUNDAY AND INTO MONDAY. EVEN
THE 00Z EC IS A WHOLE DAY FASTER THEN ITS PREVIOUS RUN. HOWEVER
THE GFS/UKMET/ECENS SHOW A WEAKER COASTAL LOW AND KEEPS IT WELL TO
THE SOUTH OF THE REGION. GEFS KEEPS THE SYSTEM OFFSHORE AS WELL
HOWEVER THERE ARE A FEW MEMBERS ALIGNED WITH THE EC. BELIEVE THAT
THE ECMWF IS A TAD TO FAST FOR THIS UPCOMING SYSTEM AS WE ARE IN
AN AMPLIFIED PATTERN. THEREFORE FOR THIS FORECAST...TRENDED
TOWARDS WPC.
 

SUNDAY AND BEYOND...
SUNDAY COULD GO TWO DIFFERENT WAYS DEPENDING ON WHICH GROUPING OF
MODELS YOU PREFER. HOWEVER IT ALL DEPENDS ON THE STRENGTH OF THE
HIGH...WHETHER ITS STRONG ENOUGH TO KEEP COASTAL LOW OFFSHORE OR
WEAK ENOUGH FOR THE SYSTEM TO COME INTO NEW ENGLAND. THIS SYSTEM
WILL HAVE TO BE WATCHED OVER THE NEXT SEVERAL RUNS TO SEE WHERE IT
ENDS UP...INTO THE REGION OR OFFSHORE. IDEALLY BELIEVE THAT THE
TREND OF THIS SYSTEM WILL SLOW DOWN DUE TO AMPLIFIED PATTERN SO
BELIEVE SUNDAY WOULD BE A PLEASANT DAY...WITH SOME EFFECT FROM THE
COASTAL SYSTEM IMPACTING THE REGION MONDAY/TUESDAY.

-- End Changed Discussion --



 

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