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East Coast winter storm, February 13th-14th, imminent (Part II)


Typhoon Tip

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I don't know what to think. 0.5F means 3" or 7" here. I don't like how the models are consistently mild here with temps, but I honestly think they are a hair too warm. At least for my area and BOS.

Interestingly the 18z hi-res NAM goes from 37 at BOS at 16Z then down to 32 at 18Z with the most intense precip. Perhaps some dynamics/intensity flip-flop things between rain/snow for a while tomorrow?

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Your 4k NAM looks pretty similar to the Euro. Follow the higher reflectivities. Front end thump pounds ENE and then the brunt of the deformation stays in far E NY and VT.

 

http://www.meteo.psu.edu/~fxg1/NAMSFC4_18z/rloop.html

 

This track, and these upper level features, is not going to favor eastern areas for deformation.

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From BOX afternoon discussion:

 

 

.SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
LOW PRESSURE MOVES UP THE COAST SPREADING DEEP LIFT AND MOISTURE
ACROSS ALL OF SOUTHERN NEW ENGLAND. OUR AREA WILL BE UNDER THE
RIGHT ENTRANCE REGION OF THE UPPER JET...WHILE LOW AND MID LEVEL
FRONTOGENETIC FORCING WILL BE FAVORABLE OVER MOST OF THE REGION.

TEMPERATURE PROFILES FAVOR SNOW IN ALL AREAS INITIALLY...BUT WITH
ABOVE-FREEZING AIR MOVING UP FROM THE SOUTH DURING THE MORNING AND
CHANGING THE SNOW TO RAIN IN THE COASTAL PLAIN BY MIDDAY OR EARLY
AFTERNOON. THE WARMER AIR MAY SPREAD INTO NORTHEAST CT AND
PARTS OF CENTRAL MASS...BUT LESS CONFIDENCE ON THIS DUE TO THE
SNOWCOVER AND ITS COOLING INFLUENCE NEAR THE SURFACE. THE WARM
TEMPS ALOFT AND COOLER TEMPS NEAR THE SURFACE MAY RESULT IN A
PERIOD OF FREEZING RAIN DURING THE AFTERNOON AND EVENING. WESTERN
AREAS SHOULD REMAIN MAINLY AS SNOW. WITH STRONG LIFT IN THE SNOW
GROWTH ZONE...PERIODS OF INCH/HOUR SNOWFALL RATES ARE LIKELY JUST
NORTH/WEST OF THE CHANGEOVER LINE.

MODELS SIGNAL A WELL DEFINED COMMA HEAD MOVING ACROSS SOUTHERN NEW
ENGLAND DURING THURSDAY NIGHT. THIS TAKES PLACE JUST AS THE
SURFACE LOW PASSES...OVER OR NEAR CAPE COD...AND WINDS SHIFT TO
NORTH/NORTHWEST DRAWING COLD AIR BACK ACROSS ALL OF OUR AREA. THIS
WILL GENERATE FRONTOGENTIC FORCING AND LIFT AS ANY RAIN OR ICE
CHANGES BACK TO SNOW. WESTERN AND CENTRAL MASS AND SOUTHERN NH ARE
MOST AT RISK FOR HEAVIEST ACCUMULATIONS.

EXPECTED SNOWFALL RANGES FROM 14-18 INCHES IN THE EAST SLOPES OF
THE BERKSHIRES AND THE WORCESTER-MONADNOCK HILLS TO 1-2 INCHES ON
THE CAPE AND ISLANDS. COULD BE A FEW SPOTS IN THE BERKSHIRE ZONES
THAT HAVE 18-24 INCHES. WE ARE EXPECTING A SHARP GRADIENT OF
SNOW ACCUMULATION JUST INLAND OF THE I-95 CORRIDOR. ICE
ACCUMULATIONS OF UP TO 0.25 INCHES ARE POSSIBLE OVER PARTS OF
NORTHERN CT AND CENTRAL MASS.

THE LOW LEVEL JET PULLED NORTH BY THE STORM WILL MOVE ACROSS
EASTERN MASS/RI THURSDAY AFTERNOON AND EARLY NIGHT. THE MOST
FAVORABLE LAPSE RATES WILL REMAIN OFFSHORE OF CAPE COD. BUT LAPSE
RATES APPROACHING MOIST ADIABATIC ARE POSSIBLE...WHICH WOULD ALLOW
THE 50 MPH WINDS TO MIX TO THE SURFACE IN RAIN. THE GREATEST RISK
WILL BE ON THE CAPE AND ISLANDS...AND ACROSS CAPE ANN IN NORTHEAST
MASS. A WIND ADVISORY HAS BEEN ISSUED FOR THESE AREAS.

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From BOX afternoon discussion:

 

 

.SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...

LOW PRESSURE MOVES UP THE COAST SPREADING DEEP LIFT AND MOISTURE

ACROSS ALL OF SOUTHERN NEW ENGLAND. OUR AREA WILL BE UNDER THE

RIGHT ENTRANCE REGION OF THE UPPER JET...WHILE LOW AND MID LEVEL

FRONTOGENETIC FORCING WILL BE FAVORABLE OVER MOST OF THE REGION.

TEMPERATURE PROFILES FAVOR SNOW IN ALL AREAS INITIALLY...BUT WITH

ABOVE-FREEZING AIR MOVING UP FROM THE SOUTH DURING THE MORNING AND

CHANGING THE SNOW TO RAIN IN THE COASTAL PLAIN BY MIDDAY OR EARLY

AFTERNOON. THE WARMER AIR MAY SPREAD INTO NORTHEAST CT AND

PARTS OF CENTRAL MASS...BUT LESS CONFIDENCE ON THIS DUE TO THE

SNOWCOVER AND ITS COOLING INFLUENCE NEAR THE SURFACE. THE WARM

TEMPS ALOFT AND COOLER TEMPS NEAR THE SURFACE MAY RESULT IN A

PERIOD OF FREEZING RAIN DURING THE AFTERNOON AND EVENING. WESTERN

AREAS SHOULD REMAIN MAINLY AS SNOW. WITH STRONG LIFT IN THE SNOW

GROWTH ZONE...PERIODS OF INCH/HOUR SNOWFALL RATES ARE LIKELY JUST

NORTH/WEST OF THE CHANGEOVER LINE.

MODELS SIGNAL A WELL DEFINED COMMA HEAD MOVING ACROSS SOUTHERN NEW

ENGLAND DURING THURSDAY NIGHT. THIS TAKES PLACE JUST AS THE

SURFACE LOW PASSES...OVER OR NEAR CAPE COD...AND WINDS SHIFT TO

NORTH/NORTHWEST DRAWING COLD AIR BACK ACROSS ALL OF OUR AREA. THIS

WILL GENERATE FRONTOGENTIC FORCING AND LIFT AS ANY RAIN OR ICE

CHANGES BACK TO SNOW. WESTERN AND CENTRAL MASS AND SOUTHERN NH ARE

MOST AT RISK FOR HEAVIEST ACCUMULATIONS.

EXPECTED SNOWFALL RANGES FROM 14-18 INCHES IN THE EAST SLOPES OF

THE BERKSHIRES AND THE WORCESTER-MONADNOCK HILLS TO 1-2 INCHES ON

THE CAPE AND ISLANDS. COULD BE A FEW SPOTS IN THE BERKSHIRE ZONES

THAT HAVE 18-24 INCHES. WE ARE EXPECTING A SHARP GRADIENT OF

SNOW ACCUMULATION JUST INLAND OF THE I-95 CORRIDOR. ICE

ACCUMULATIONS OF UP TO 0.25 INCHES ARE POSSIBLE OVER PARTS OF

NORTHERN CT AND CENTRAL MASS.

THE LOW LEVEL JET PULLED NORTH BY THE STORM WILL MOVE ACROSS

EASTERN MASS/RI THURSDAY AFTERNOON AND EARLY NIGHT. THE MOST

FAVORABLE LAPSE RATES WILL REMAIN OFFSHORE OF CAPE COD. BUT LAPSE

RATES APPROACHING MOIST ADIABATIC ARE POSSIBLE...WHICH WOULD ALLOW

THE 50 MPH WINDS TO MIX TO THE SURFACE IN RAIN. THE GREATEST RISK

WILL BE ON THE CAPE AND ISLANDS...AND ACROSS CAPE ANN IN NORTHEAST

MASS. A WIND ADVISORY HAS BEEN ISSUED FOR THESE AREAS.

 

Pretty much mirrors my zone layout from a little while ago... 

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Well gotta get warmth out first. Second, this run shifted east which is what you want. We were describing the 12z runs and what they had verbatim. Still would like to have another shift for you guys, bit this crushes nrn ORH.

 

Jaffrey for the win on this bad boy.  Let's nudge it a little west shall we.....

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)))" data-cid="2778431" data-time="1392241848">

We've done better than modeled for temps on most events this season, but my confidence isn't very high for this one. Would be ecstatic with 4-6" but counting more on 2-4".

 

 

Until today I would not have disagreed but now I tell you.."prepare for ecstasy"

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