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Richmond Metro/ Hampton roads obs/disco winter thread


Midlo Snow Maker

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Interesting read

SAT NIGHT AND SUN...THIS PERIOD REMAINS THE PRIMARY FOCUS OF THE

FORECAST...AND UNFORTUNATELY PER THE RECENT (00/06Z) MODEL RUNS...

WE ARE PROBABLY NO CLOSER AT A CONSENSUS MODEL-WISE THAN WE WERE

12-24 HRS AGO. THE 00Z ECMWF TOOK A NOTICEABLE JOG TO THE E

(FARTHER OFFSHORE)...AND IS ACTUALLY MORE IN LINE NOW WITH THE NAM

AND THE SREF. THE GFS (BOTH OP AND ENSEMBLE MEAN RUNS) MEANWHILE

ARE NOT AS MUCH CLOSER TO THE COAST WITH THE LOW TRACK AS THEY ARE

FARTHER WEST WITH THE MOISTURE SWATH/PRECIP SHIELD. CLOSER

INSPECTION OF THE GFS SHOWS QUICKER ARRIVAL OF UPR LVL SPEED MAX

INTO THE LWR OH VLY...THUS FASTER UPR LVL AMPLIFICATION (NEG TILT

WITH THE UPR TROUGH AXIS)...LEADING TO (THEN) FASTER CYCGLOGENESIS.

THE OTHER MODELS MEANWHILE DO NOT EXHIBIT AS MUCH OF A CLASSIC

BAROCLINIC LEAF ON THE N/NW SIDE OF THE SFC LOW (NOT AS BROAD WITH

THE MID LVL TROWAL OR LLVL CCB).

THE UPSHOT IS HIGHER POPS/QPF FARTHER W ACROSS THE CWA PER THE

GFS AND TO SOME EXTENT THE SREF...WHILE THE BEST PRECIP

CHANCES/AMOUNTS ARE CONFINED CLOSER TO THE COAST PER THE NAM AND

ECMWF. GIVEN THE UNCERTAINTY (STILL SOME 36+ HOURS AWAY FROM THE

ONSET OF PRECIP)... DID NOT MAKE MANY CHANGES TO THE PREVIOUS

FCST. MEANWHILE...SHOULD IT COME INTO PLAY...PRECIP TYPE WOULD

CONTINUE TO BE MOST PROBLEMATIC E OF I-95...GIVEN WARM LAYERS NEAR

THE SFC (INCREASING ONSHORE FLOW) AND ALOFT (WITH THE WAA). SUCH A

SCENARIO WOULD FIT THE PATTERN CLIMO-WISE GIVEN THE ANTICIPATED

LOW TRACK...ALONG WITH THE LACK OF A STRONG SFC HIGH/LLVL RIDGE TO

OUR N AS THE AXIS OF MAXIMUM UPR LVL CONFLUENCE SAT NIGHT INTO SUN

IS DISPLACED E OF THE CANADIAN MARITIMES (I.E. FARTHER N AND E TO

SUPPORT SUSTAINABLE COLD AIR/LOW WET BULB TEMPS DURING THE EARLY

STAGES OF THIS EVENT).

STILL TOO MUCH UNCERTAINTY (LOW FCST CONFIDENCE) WITH THIS

SYSTEM...IN TERMS OF THE SPATIAL RESOLUTION OF BOTH QPF AND

P-TYPE...TO HOIST 4TH PERIOD WATCHES AT THIS POINT. GIVEN THE

PROJECTED (ENSEMBLE) TRACK PER THE MODELS...A MORE WINTRY (SNOW

AND OR SLEET) P-TYPE WOULD BE FAVORED ALONG AND W OF THE I-95

CORRIDOR SAT NIGHT...WITH THE FROZEN P-TYPES PUSHING E DURING THE

DAY ON SUN AS COLDER AIR WRAPS IN ON BACK SIDE OF THE DEPARTING

SFC LOW. AGAIN THOUGH...THE MAIN ISSUE IN TERMS OF POTENTIAL

SNOW/SLEET ACCUMS IS HOW FAR N-NW-W INTO THE COLDER LOWER LAYERS

WILL THE MOISTURE EXTEND. THE GFS AND SREF SUGGEST A WIDER BAND OF

WINTRY PRECIP INLAND...WHILE THE NAM/ECMWF SHOW THE PRECIP

CONFINED CLOSER TO THE COAST (MAINLY RAIN) AND THUS IMPLYING A

NARROW AT BEST BAND OF SNOW/SLEET ACCUMS.

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