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Norlun Trough Discussion - Feb. 19


NorEastermass128

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I don't think we whiff, but I could easily envision just SW getting clocked by the NORLUN, then the Midcoast Mauler developing to the east.

I do think the inverted trough gets caught in the upper flow and progresses northeast up the coast. While it does that it could lay down a quick 3-6 just about everywhere.

Kinda hurts when places left and right of my hood might get clocked and we're left with scraps. Just dealt with that last storm.
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Kinda hurts when places left and right of my hood might get clocked and we're left with scraps. Just dealt with that last storm.

 

Or it could just as easily set up over the PWM area. That's the tough part about these features.

 

I normally would have warnings up now, but I would rather see the whites of its eyes.

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I just don't know what you guys do up there. Rgem was pretty poor here last event missing by 50 miles with the banding even at game time. Obviously you've got to wait for 12z and hope for consenus.

 

I think we're in pretty good shape on our two areas of potentially higher snowfall. That upper end could be impressive, but I can't really go with those totals just yet.

 

All I can really do is tell people that a significant snowfall is probable.

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BOX

 


.NEAR TERM /UNTIL 6 PM THIS EVENING/...
7 AM UPDATE...

CURRENT RADAR SHOWS A NARROW BAND OF SNOW SHOWERS EAST OF TRURO
WITH NO CLEARLY DEFINED MOVEMENT. WATER VAPOR IMAGERY DEPICTS
UPPER SHORT WAVE TROF ADVERTISED BY MODELS DIGGING THROUGH THE
GREAT LAKES REGION. THIS WILL BECOME A PLAYER IN OUR WEATHER VERY
LATE TODAY INTO THURSDAY. MAIN NEAR TERM ISSUE IS TEMPERATURES.
RATHER LARGE DEPARTURES SEEN BETWEEN FORECAST AND OBSERVED
TEMPERATURES...BUT THERE IS ALSO GREAT SPATIAL VARIABILITY ACROSS
SOUTHERN NEW ENGLAND. IN GENERAL TEMPERATURES ARE WELL BELOW ZERO
IN THE CT RIVER VALLEY WITH CEF AT -14 AND ORE AT -12. YET ORH IS
13 ABOVE AS IS SFZ. HAVE ATTEMPTED TO ADJUST TEMPERATURES IN NEAR
TERM TO REFLECT REALITY BUT THIS MAY PROVE CHALLENGING AS
TEMPERATURE RECOVERY TAKES PLACE AT DIFFERENT RATES AND FROM VERY
DIFFERENT STARTING POINTS.

TODAY...
OFFSHORE SURFACE LOW SUPPORTED BY RIGHT ENTRANCE REGION OF UPPER
JET. INVERTED TROUGH EXTENDS FROM LOW NORTH TO MASSACHUSETTS
COAST. GFS AND ECMWF BOTH SHOW LIGHT PCPN AREA ACROSS OUTER CAPE
COD TO NEAR CAPE ANN. WRF-NMM ALSO PICKS UP ON THIS BUT KEEPS
MOST LIFT/MOISTURE JUST OFF CAPE ANN. THE FORECAST WILL MAINTAIN
CHANCE POPS ALONG THE MASS COAST FROM PROVINCETOWN TO CAPE ANN.

ALSO OF CONCERN WILL BE THE APPROACH OF THE UPPER TROUGH FROM THE
GREAT LAKES. THE ASSOCIATED SURFACE LOW AND FRONT REACHES THE
CATSKILLS/POCONOS TOWARD EVENING AND THE UPPER COLD POOL AXIS IS
TO THE WEST. EXPECT INCREASING CLOUDS...BUT PCPN CHANCES LOOK
LIMITED UNTIL THE FEATURES SHIFT FARTHER EAST.

TEMPS IN THE MIXED LAYER WILL BE SIMILAR TO 850 MB TEMPS OF -15C
TO -18C...SO MAX TEMPS SHOULD BE IN THE 20S TO LOWER 30S.

 

 


 

 

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Can't be any worse than forecasting 18" and waking up to 2"

The whole dynamic with this one is different. While there were certainly some x-factors with that last storm, it looked like much more of a slam-dunk for a generalized heavy synoptic snowfall. With an inverted trough, you know going into it that it's a bit of a crapshoot and that it'll be a much smaller bullseye.

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