NATIONAL WEATHER SERVICE NEW YORK NY 1:51AM,EDT SATURDAY OCTOBER 6,2012 .SYNOPSIS... HIGH PRESSURE GIVES WAY TO A COLD FRONT SATURDAY. THE FRONT SETTLES JUST TO THE SOUTH AS LOW PRESSURE RIDES ALONG IT SUNDAY. HIGH PRESSURE BUILDS EARLY NEXT WEEK AS ANOTHER COLD FRONT MOVES THROUGH BY MID WEEK. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... FORECAST REMAINS ON TRACK FOR EARLY THIS MORNING. THE DELAY OF CLOUD COVER WITH A LIGHT SOUTHERLY FLOW ACROSS THE AREA IS CAUSING VSBYS TO DROP. MAY HAVE SOME PATCHY FOG IN THE USUAL OUTLYING AREAS AND RIVER VALLEYS FOR A FEW HOURS AS DEWPOINT DEPRESSIONS DECREASE OVERNIGHT...BUT PRESSURE GRADIENT IS FORECAST TO TIGHTEN AND SFC WINDS MAY INCREASE JUST ENOUGH TO KEEP VSBYS FROM DROPPING BELOW 2 MILES. INCREASING CLOUDS WILL ALSO KEEP THE DEPRESSIONS HIGHER...ESPECIALLY LATE SO ONLY HAVE PATCHY FOG UNTIL AROUND DAYBREAK. A WEAK SHORTWAVE TROUGH WILL MOVE QUICKLY TO THE NW LATE TONIGHT WITH INCREASING CLOUDS AS A SFC COLD FRONT NEARS FAR NW ZONES. A MILD NIGHT WITH ABOVE NORMAL TEMPS IS EXPECTED DUE TO THE INCREASE IN CLOUD COVER AND A RETURN FLOW. MOS GUIDANCE WAS IN GOOD AGREEMENT WITH LOWS TONIGHT AND A BLEND WAS USED AS A RESULT. && .SHORT TERM /6 AM THIS MORNING THROUGH 6 PM SUNDAY/... AT THE SFC...COLD FRONT MOVES EAST ACROSS THE AREA SATURDAY AND SETTLES TO THE SOUTH. LOW PRESSURE DEVELOPS ON THIS FRONT AND REMAINS WELL SOUTH SUNDAY AS SFC RIDGING BUILDS TO THE WEST. IN THE UPPER LEVELS...LARGE GENERAL TROUGH...WITH SHORTWAVE PIVOTING AROUND THE BASE...IMPACTS MUCH OF THE NORTHEAST. DID NOT MAKE WHOLESALE CHANGES TO THE DATABASE FOR THIS WEEKEND...ESPECIALLY WITH REGARD TO PRECIPITATION PROBABILITIES DUE TO MIXED MODEL SIGNALS. CLOSE ANALYSIS OF SREF ENS MEMBERS...ALONG WITH OPERATIONAL GFS/NAM/00Z ECMWF...SUGGEST MAINTAINING CHANCE POPS FOR SATURDAY ALONG THE COLD FRONT...AND LIKELY POPS SUNDAY. MANY SREF MEMBERS WERE ACTUALLY FAIRLY DRY AND WOULD NOT WARRANT MUCH MORE THAN CHANCE POPS ON SUNDAY...WHEREAS MANY MODEL SOLUTIONS SUGGEST CATEGORICAL POPS WITH THIS EVENT. THIS IS ALL RELATED TO UPSTREAM VIGOROUS SHORTWAVE THAT ROUNDS THE BASE OF THE MAIN TROUGH...AS IT MOVES FROM SOUTHWEST TO NORTHEAST SUNDAY. THIS MID AND UPPER LEVEL LIFT SHOULD RESULT IN RAIN DEVELOPMENT...WHICH WOULD OCCUR WELL TO THE NORTH OF THE FRONTAL BOUNDARY/LOW PRESSURE. AS SUCH...EXPECT LIKELY POPS IN RAIN BY SUNDAY AFTERNOON. STAY TUNED. AS FOR TEMPS...ANOTHER MILD DAY IS IN STORE FOR THE AREA SATURDAY. AS THE FRONT CLEARS THE AREA...TEMPS SHOULD FALL BACK CLOSER TO NORMAL LEVELS SATURDAY NIGHT. ON SUNDAY...CLOUDS AND RAIN ALONG WITH COLD AIR ADVECTION WILL ENSURE BELOW NORMAL TEMPS...IN THE 50S. AGAIN...FOLLOWED MOS CLOSELY THIS TIME FRAME. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... CONDITIONS BEGIN TO IMPROVE FROM WEST TO EAST AS RAIN BEGINS TO TAPER OFF SUNDAY NIGHT INTO EARLY MONDAY. HIGH PRESSURE BUILDS ACROSS THE AREA MONDAY AND TUESDAY...BRINGING DRY AND COOL WEATHER. DAYTIME HIGHS SHOULD BE IN THE UPPER 50S TO LOWER 60S...WITH NIGHT TIME TEMPERATURES IN THE LOW TO MID 40S ALONG COASTAL AREAS TO MID 30S TO AROUND 40 INLAND. ANOTHER LOW PRESSURE SYSTEM AND ITS ASSOCIATED COLD FRONT IS FORECAST TO IMPACT THE AREA ON WEDNESDAY...BRINGING ANOTHER CHANCE OF RAIN AND MORE COOL AIR BEHIND THE FRONT. HIGH PRESSURE BUILDS BACK ON THURSDAY WITH ANOTHER FRONTAL SYSTEM EXPECTED ON FRIDAY. && .AVIATION /06Z SATURDAY THROUGH WEDNESDAY/... HIGH PRESSURE REMAINS OFF THE NORTHEAST COAST OVERNIGHT. A COLD FRONT WILL APPROACH IN THE MORNING AND MOVE THROUGH THE TERMINALS DURING THE AFTERNOON. HIGH PRESSURE THEN BUILDS FROM THE WEST SATURDAY NIGHT. MAINLY VFR THROUGH THE PERIOD. MVFR FOG AT KGON WILL IMPROVE TOWARD MORNING. LIGHT SW FLOW OVERNIGHT INCREASES AND BECOMES GUSTY IN THE MORNING WITH WINDS INCREASING TO 10 KT TO 14 KT...WITH SOME GUSTS AS HIGH AS 24 KT. HIGHEST GUSTS ARE EXPECTED IN THE MORNING TO AROUND MIDDAY. WINDS BECOME MORE WESTERLY WITH THE APPROACH OF THE COLD FRONT AND SHIFT TO THE NORTHWEST WITH THE PASSAGE. THERE MAY BE A COUPLE OF HOURS WHERE THE WIND IN AROUND 310 TRUE WITH THE FRONT IN THE VICINITY. SHOWERS WILL BE BRIEF WITH...AND JUST BEHIND THE FRONT...CEILINGS LOWER TO AROUND 4K FT WITH NO IMPACT TO VISIBILITIES. OUTLOOK FOR 06Z SUNDAY THROUGH WEDNESDAY... .SATURDAY NIGHT...VFR. .SUNDAY...MVFR OR LOWER CONDS POSSIBLE IN RAIN...ESPECIALLY IN THE AFTERNOON AND EVENING. .MONDAY-WEDNESDAY...VFR. && .MARINE... FORECAST REMAINS ON TRACK. SOUTHWEST WINDS AHEAD OF AN APPROACHING COLD FRONT TONIGHT WILL GRADUALLY INCREASE. IN FACT...WINDS COULD APPROACH SMALL CRAFT CRITERIA SATURDAY INTO SATURDAY NIGHT...BOTH AHEAD OF AND BEHIND THE FRONT BRIEFLY. THEN WINDS DIMINISH SUNDAY AS LOW PRESSURE PASSES JUST SOUTH. TRANQUIL SEAS ARE EXPECTED TO BUILD AS THE WINDS INCREASE...THEN SUBSIDE LATER THIS WEEKEND. WAVE WATCH III OUTPUT LOOKS REASONABLE. SUB SCA CONDITIONS ARE EXPECTED SUNDAY NIGHT THROUGH TUESDAY. A COLD FRONT MAY IMPACT THE WATERS WEDNESDAY WITH POSSIBLE SCA CONDITIONS NEEDED WEDNESDAY AND WEDNESDAY NIGHT. && .HYDROLOGY... NO SIGNIFICANT PRECIPITATION IS EXPECTED THROUGH SATURDAY. BASIN AVERAGES OF UP TO A HALF AN INCH ARE FORECAST FOR SUNDAY. THIS WILL BE A STRATIFORM EVENT WITH A PROLONGED PERIOD OF LIGHT TO MODERATE RAIN FROM LATE SUNDAY MORNING INTO THE FIRST HALF OF SUNDAY NIGHT. THUS...FLOODING IS NOT EXPECTED.
A place to view interesting weather news of the day mainly from sites like Accuweather.com and Weather.com
Friday, October 5, 2012
New York City area forecast discussion from noaa.gov
Here's the short and long-term forecast discussion for the New York City metro-area from noaa.gov.enjoy:
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