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Possible 3/20-3/21 Coastal Storm


Zelocita Weather

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http://www.wpc.ncep.noaa.gov/discussions/hpcdiscussions.php?disc=pmdepd

 

EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
230 AM EDT THU MAR 17 2016
 
VALID 12Z SUN MAR 20 2016 - 12Z THU MAR 24 2016
 
...BATTLE OF THE SEASONS FOR PARTS OF THE MID-ATLANTIC AND
NORTHEAST EARLY NEXT WEEK...
 
 
...OVERVIEW...
 
WINTER IS NOT OVER. UPPER PATTERN IS EXPECTED TO TRANSITION FROM A
RIDGE/TROUGH ORIENTATION ALONG THE DIVIDE AND IN THE EAST,
RESPECTIVELY, EARLY NEXT WEEK TO ZONAL FLOW AS THE UPPER LOW SOUTH
OF THE GULF OF ALASKA PUSHES INTO THE PACIFIC NORTHWEST. ENSEMBLES
INDICATE TROUGHING OR EVEN A CLOSED LOW TO DEVELOP IN THE ROCKIES
AND THEN CENTRAL PLAINS NEXT WED-THU, WITH EXPECTED DIFFERENCES
AMONG THE GUIDANCE.
 
AT THE SURFACE, A DEEPENING BUT PROGRESSIVE SYSTEM WILL LIFT
NORTHEASTWARD JUST OFF THE EAST COAST SUN-MON AND INTO CANADA
TUESDAY. AT THE SAME TIME, A PACIFIC FRONT AHEAD OF THE UPPER
TROUGH WILL PUSH THROUGH THE WEST AND ONTO THE PLAINS WITH A SW TO
NE FRONTAL BOUNDARY BY MIDWEEK NEXT WEEK.
 
 
...MODEL PREFERENCES/UNCERTAINTY ASSESSMENT...
 
ENSEMBLES HAVE WAVERED ON THE TRACK OF THE EASTERN SYSTEM OVER THE
PAST SEVERAL DAYS, BUT HAVE MOSTLY SETTLED ON A COURSE FROM OFF
NC/SC TO NEAR 40N/70W. THE 12Z ECMWF/ECENS MEAN OFFER A GOOD
MIDDLE GROUND BETWEEN THE QUICKER 18Z GFS/GEFS MEAN, FARTHER
EAST/SOUTHEAST NAEFS/CANADIAN MEAN, AND SLOWER CANADIAN/UKMET. 12Z
GFS/GEFS LIED JUST TO THE EAST OF THE ECMWF/ECENS MEAN, AND A
COMPROMISE BETWEEN THESES TWO CAMPS OFFERED A REASONABLE STARTING
POINT. THE LOW WILL LIFT NORTHEASTWARD JUST EAST OF MAINE PERHAPS
RIGHT THROUGH THE BAY OF FUNDY.
 
BACK TO THE WEST, UPPER LOW WILL SEND A SURFACE FRONT INTO AND
THROUGH THE WEST SUN-MON WITH TRAILING A SHORTWAVE TUE. AS HEIGHTS
BUILD AGAIN IN THE EAST, POSITIVELY TILTED TROUGHING WILL BE
FAVORED IN THE CENTRAL PLAINS WITH THE POSSIBILITY OF A CLOSED LOW
IN THE FOUR CORNERS REGION BY NEXT THURSDAY. HOWEVER, THE 12Z
ECMWF WAS NEARLY THE STRONGEST OF ANY ENSEMBLE MEMBER
(GEFS/GEPS/EPS) TO SHOW THIS (CLOSED LOW). FAVORED A COMPROMISE
BETWEEN THE 12Z GFS AND ECENS MEAN WHICH WAS MORE PROGRESSIVE
(LIKE THE 12Z CANADIAN). GEFS ENSEMBLES WERE QUICKER OVERALL WHICH
IS TYPICALLY THE CASE BY DAY 7.
 
 
...SENSIBLE WEATHER HIGHLIGHTS...
 
EASTERN SYSTEM WILL BRING RAIN/SNOW/WIND TO THE MID-ATLANTIC
REGION UP INTO THE NORTHEAST SUNDAY INTO MONDAY BEFORE WINDING
DOWN EARLY TUESDAY. DETAILS OF THE SYSTEM WILL BE CRITICAL AS
SURFACE TEMPERATURES AND THE EXTENT OF PRECIPITATION WILL
DETERMINE WHO SEES PLAIN RAIN, SNOW BUT LITTLE ACCUMULATION, AND
SNOW WITH SIGNIFICANT ACCUMULATION. MARGINAL THERMAL PROFILES
SUGGEST A HEAVY, WET SNOW IS POSSIBLE. TEMPERATURES WILL BE WELL
BELOW AVERAGE AS THE SYSTEM PASSES BY BUT THEN REBOUND THROUGH THE
REST OF THE WEEK TO BACK ABOVE AVERAGE.
 
THE WEST WILL SEE PRECIPITATION EXPAND FROM COASTAL WA/OR AND
NORTHERN CALIFORNIA EASTWARD BUT NOT MUCH FARTHER SOUTH THAN
CENTRAL CALIFORNIA AND SOUTHERN NEVADA. THAT WILL CONTINUE
EASTWARD TOWARD THE PLAINS AND GREAT LAKES TUE/WED AS THE INITIAL
LOW WEAKENS IN SOUTHERN ONTARIO. GULF MOISTURE SHOULD SLOWLY
REBUILD THROUGH THE WEEK SO THAT BY WED INTO THU MORE PRECIP WILL
FIRE SOUTHEAST OF THE COLD FRONT AND EVEN BACK ACROSS FLORIDA.
 
 
FRACASSO
 
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http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=namk&MODELL=brams&MODELLTYP=1&BASE=-&VAR=pr06&HH=102&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=

 

 

brams model on board,n.y.c and l.i slam job in progress.the whole run is crazy,n.y.c all snow,eastern l.i,boston and prov snow to rain back to snow according to this model.

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So nice to have model agreement. The GFS still wants no part of the storm and the Euro is gung ho. Hopefully 12z clears this crap up

The GFS has a history of being very slow to catch on when it's doing what it is with this system, the piecemeal messy deal where it has trouble phasing things. I've seen it hold out until 48-54 hours a few times

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Some Meteorologist are beginning to mention signs of possible mixing at coast. Hopefully you and your crew get crushed this time around as well.

The UKMET certainly based on track would indicate that. The UKMET would be a very difficult forecast for this area because it's track even once it passes northeast isn't exactly the best for back end snows because the flow would probably be somewhat downslope

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The GFS has a history of being very slow to catch on when it's doing what it is with this system, the piecemeal messy deal where it has trouble phasing things. I've seen it hold out until 48-54 hours a few times

Feb '13 is a great example. Euro was ending the world in NE; GFS never caught on. 

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Another thing that could limit accumulations near the coast is if the surface low passes overhead. It's not out of the question that it could come ashore on Long Island.

Agree. If that happens, mixing will def be an issue until the low bombs and moves away.

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