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Feb 15 clipper/redeveloper


ORH_wxman

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Yeah Euro is still a tease...light snow for everyone, but mostly like an inch or two...maybe adivsory for far SE MA/Cape?

 

 

Still have about 24 hours to realistically nudge this one further NW into >4" territory before the models will be reliable enough to say it is what it is. The GFS suite was nice looking but the foreign models were all a tease.

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fwiw which isvery little , the 09z SREFs weren't all that bad.  0.5" line at the outer cape right now.

15z SREFs took a huge jump west.  0.5" line all the way back to PVD/BOS now.  About a 30mile shift  ~990mb low as it rounds the BM about 30mi S & E of it.  ~980mb low into eastern tip of Nova Scotia.

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FRIDAY NIGHT INTO SATURDAY NIGHT...

FAVOR ECMWF SOLUTION WITH THE BEST INITIALIZATION OF SURFACE LOWS
AND ATTENDANT MID-LEVEL ENERGY OVER BRITISH COLUMBIA AND MINNESOTA.
SO WILL CONSIDER A STORM TRACK FOR THE PERIOD IN PROXIMITY TO THE
BENCHMARK.

BUT BEFORE GOING ANY FURTHER...MUST NOTE AN UNDERLYING LEVEL OF
UNCERTAINTY PER POTENTIAL PHASING/EVOLUTION CHALLENGES WITHIN MODEL
SOLUTIONS OF PACIFIC-ORIGIN ENERGY. NOTHING IS EVER PERFECT. WHAT
APPEARS TO KEEP THE LOW FURTHER S/E OFFSHORE IS PERHAPS THE STRONGER
INFLUENCE OF ARCTIC HIGH PRESSURE OVER THE HUDSON BAY...AND DRIER
AIR/SUBSIDENCE BEHIND THE PRESENT STORM. BUT THE STRENGTH OF SUCH
FEATURES AGAINST THE INTENSITY OF THE STORM CAN LEAD TO WOBBLES IN
LOW POSITIONING. CAN NOT RULE OUT A CLOSER PASSAGE TO THE SHORE...
OR PERHAPS EVEN FURTHER AWAY.

NEVERTHELESS...THE GENERAL TREND IS FOR THE LOW TO BOMB TOWARDS NOVA
SCOTIA AS THE MID-LEVEL TROUGH UNDERGOES NEGATIVE TILTING ENHANCING
CYCLOGENESIS. WHILE OVERRUNNING OF LIGHT SNOW IS EXPECTED SATURDAY
THE MAIN FOCUS IS SATURDAY NIGHT WITH THE REARWARD COMMA-HEAD AND
MESOSCALE SNOW BANDING IN FAVORABLE REGIONS OF MID-LEVEL FORCING/
DEFORMATION POTENTIALLY BENEATH THE RRQ OF THE UPPER-LEVEL JET...
PERHAPS JET-COUPLING WITH THE LFQ OF THE ATTENDANT JET-STREAK TO THE
STORM. IN ALL...DEEP-LAYER ASCENT THROUGH THE SNOW-GROWTH REGION
EXPECTED REAR-WARD WITHIN THE COMMA-HEAD OF THE STORM...ESPECIALLY
IF LAPSE RATES STEEPEN TO NEARLY DRY-ADIABATIC ABOVE H7 AS THE ECMWF
SUGGESTS.

STRONG NW WINDS ACROSS THE INTERIOR WITH N/NE OVER THE WATERS...THUS
A COASTAL-FRONT SETUP ENTIRELY PLAUSIBLE. H85 TEMPS COOLING TO -10C
COULD YIELD OCEAN-EFFECT PROCESSES. THESE TWO POSSIBILITIES ONLY
ENHANCE POTENTIAL OUTCOMES REARWARD OF THE STORM. COUPLED WITH THE
GENERAL DISCUSSION OF OUTCOMES ABOVE...AND THERE IS THE DISTINCT
POSSIBILITY OF A SIGNIFICANT PLOWABLE SNOW AND WINTER WEATHER
HEADLINES FOR S/E COASTAL COMMUNITIES OF SNE /ESPECIALLY FOR THE
CAPE AND ISLANDS/. STILL NEED TO IRON OUT DETAILS AND WAIT FOR
BETTER MODEL CONSENSUS...SO WON/T GO INTO DISCUSSION WITH SNOW
TOTALS.

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