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Friday 2/5 Coastal Storm Obs/Discussion Thread


Zelocita Weather

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No, what you did was copied the 12:57 update, here's the update...

.NEAR TERM /THROUGH FRIDAY/...

A COUPLE OF LOW PRESSURE WAVES PASS BY TO OUR SE ALONG A COLD FRONT

TONIGHT AND FRIDAY. THE TWO WAVES WILL BRING PCPN TO MOST...IF NOT

ALL OF THE CWA TONIGHT INTO TOMORROW MORNING. THE SECOND WAVE WILL

BE ENHANCED BY A STRONG SHORTWAVE BEGINNING TO SHIFT THROUGH AS WELL

AS SYNOPTIC LIFT COURTESY OF THE RIGHT REAR QUADRANT OF AN UPPER JET

STREAK. MODELS OVER THE PAST COUPLE OF DAYS HAVE TRENDED WEST WITH

QPF OUTPUT. HAVE GONE WITH A BLEND OF 12ZWPC/GGEM/NAM/GFS AND 00Z

ECMWF WITH A FEW SLIGHT UPWARD ADJUSTMENTS.

WITH THE CWA ON THE BACKSIDE AND NEAR THE EDGE OF THE PCPN SHIELD

FOR THE ENTIRE EVENT ALONG WITH A NORTHERLY FLOW...THERE SHOULD BE A

SOMEWHAT SHARP GRADIENT OF SNOWFALL TOTALS WITHIN THE FORECAST AREA.

COMPLICATING THE SNOWFALL FORECAST IS THE TIMING OF WHEN THERMAL

PROFILES COOL OFF ENOUGH FOR ALL SNOW. BASED ON THERMAL PROFILES AND

WET BULB-ZERO HEIGHTS...PCPN STARTS AS RAIN TONIGHT. THEN AS COLDER

AIR GETS DRAWN IN WITH A NORTH WIND...AN EVENTUAL MIX AND CHANGEOVER

TO SNOW OCCURS DURING THE LATER HOURS. LOOKS LIKE BY

DAYBREAK...MIXING COULD STILL BE OCCURRING OVER EASTERN LONG

ISLAND...BUT OTHERWISE...SNOW ACROSS THE CWA.

BASED ON MID-LEVEL FRONTOGENESIS FORECAST...BANDED SNOW IS

POSSIBLE...BUT AS ALWAYS...THESE MESOSCALE FEATURES ARE HARD TO PIN

DOWN. ANOTHER THING TO CONSIDER ARE THE MILD TEMPERATURES AT THE

START OF THIS EVENT....AND THAT DYNAMIC COOLING COULD BE TEMPERED BY

THE LACK OF A SIGNIFICANT DRY LAYER ALOFT. COMBINED WITH THE BANDING

UNCERTAINTY...DO NOT HAVE THE CONFIDENCE TO ENHANCE SNOWFALL TOTALS

ANYWHERE IN THE CWA AT THIS TIME...BUT AN EARLIER CHANGEOVER TO SNOW

COULD RESULT IN AMOUNTS AT LEAST A COUPLE OF INCHES ABOVE THE

CURRENT FORECAST.

BEST CHANCE OF WARNING-LEVEL SNOWFALL WOULD BE OVER NEW LONDON

COUNTY...BUT EVEN HERE HAVE GONE WITH A WINTER WEATHER ADVISORY.

WINTER WEATHER ADVISORIES HAVE ALSO BEEN ISSUED FOR THE REST OF THE

CWA WITH THE EXCEPTION OF ORANGE AND WESTERN PASSAIC COUNTIES.

FOR TEMPS...WEIGHTED THEM TOWARD THE 2-METER NAM NUMBERS AS A

MAV/NAM MOS BLEND IS USUALLY TOO HIGH IN THESE SITUATIONS.

SKIES THEN BEGIN TO CLEAR OUT DURING FRIDAY AFTERNOON.

I'm aware what I did but again, really no change and in fact perhaps more variables.

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