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Blizzard of 2013 Forecast Discussion Part II


forkyfork

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I'm in Morristown and we're really quite close to the edge of the precipitation shield... Moderate snows for the past several hours though, beautiful out there. Can't wait until the phase completes and it really starts to crank!

I hear you my brother, it was great to see the back edge stop out towards Budd Lake. I had my doubts earlier this morning but when you factor in a probably one inch or more, with high ratios, ontop of the 4-6" already fallen, we could easily approach 18" out this way if not more. Depending on how far the most intense banding makes it out by us.

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MESOSCALE DISCUSSION 0124

NWS STORM PREDICTION CENTER NORMAN OK

0351 PM CST FRI FEB 08 2013

AREAS AFFECTED...SRN NEW ENGLAND...LONG ISLAND AND SRN NY...FAR NERN

NJ

CONCERNING...HEAVY SNOW

VALID 082151Z - 090145Z

SUMMARY...SNOWFALL RATES ARE EXPECTED TO INCREASE MARKEDLY THIS

EVENING ...WITH RATES OF 1-2 INCHES PER HR OVER SRN NY/NERN NJ...TO

2-3 INCHES ACROSS SRN NEW ENGLAND. ADDITIONALLY...STRENGTHENING

WINDS MAY RESULT IN LOCALIZED BLIZZARD CONDITIONS...ESPECIALLY NEAR

THE COAST.

DISCUSSION...SFC OBS FROM 21Z CONTINUE TO REFLECT A RAPIDLY

DEEPENING OFFSHORE CYCLONE...WITH PRESSURE FALLS OF 3-4 MB/HR

OBSERVED. RADAR REFLECTIVITY MOSAIC SHOWS HIGHER PRECIPITATION RATES

ARE BEGINNING TO SPREAD INLAND ACROSS LONG ISLAND AND TOWARDS RI/SRN

MA/SRN CT. HOWEVER...SOME BRIGHT-BAND ENHANCEMENT MAY BE OCCURRING

AS MIXED P-TYPE OF RAIN AND/OR SNOW IS PREDOMINANT ACROSS LONG

ISLAND...WHERE SFC TEMPERATURES ARE CURRENTLY RANGING FROM 33-35 F.

INITIALLY...NEAR- OR ABOVE-FREEZING TEMPERATURES MAY SUPPRESS RATES

IMMEDIATELY ALONG THE COAST...BUT WITH LOW-LEVEL COLD ADVECTION

INCREASING AS THE CYCLONE TRACKS N-NE...A CHANGEOVER TO

PREDOMINANTLY SNOW IS EXPECTED WITHIN THE NEXT 2-3 HRS ACROSS MOST

OF THE HIGHLIGHTED AREA.

SNOWFALL RATES WILL BE INCREASING IN CONCERT WITH INTENSE ISENTROPIC

LIFT AND LOW-LEVEL FRONTOGENESIS WITHIN A DEFORMATION ZONE.

ADDITIONALLY...AN UPSTREAM SHORTWAVE UPPER TROUGH /LOCATED OVER THE

UPPER OH VALLEY PER 2130Z WATER VAPOR IMAGERY/ IS FORECAST TO PHASE

WITH THE OFFSHORE DEEP-LAYER CYCLONE. AS THIS OCCURS...THE

COMBINATION OF STRONG MIDLEVEL HEIGHT FALLS AND UPPER DIVERGENCE

WITHIN A COUPLED UPPER JET STRUCTURE WILL CONTRIBUTE TO INCREASING

DEEP-LAYER ASCENT. FORECAST MODEL SOUNDINGS SHOW A NEARLY SATURATED

COLUMN WITH A DEEP ISOTHERMAL LAYER LOCATED BENEATH THE DENDRITIC

GROWTH ZONE. THESE FACTORS WILL BE FAVORABLE FOR EXTREMELY HIGH

SNOWFALL RATES...ESPECIALLY FROM ERN LONG ISLAND INTO SRN NEW

ENGLAND...INCLUDING THE BOSTON METRO AREA...AS SUPPORTED BY THE

RECENT SUITE OF HIGH-RESOLUTION NUMERICAL GUIDANCE.

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clueless, as usual

The echos are in the process of building back and west. We're in for a very heavy period of snow from now until hopefully 4-5am. Nearly 12 hours. Also, keep in mind that bright banding is causing some of those crazy colors to our east. I was under that for a time and didn't really experience that heavy a rain rate. We lost maybe 0.75", still well over an inch on its way of water which will be a foot or more given ratios.

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The reason the rainfall rates seem so high over Long Island on radar is because the beam is encountering the melting layer giving incorrectly high rainfall (snow) rates.

Thanks, you may have answered my question #418.     Probably need to coordinate the radar estimates with actual ground station data in real time..

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Sleeting again in Lynbrook at 30.7 degrees.

 

Are the chances still there for us getting under any of those 2-3 inch an hour bands? Or, will this be East of us in Suffolk.

When the 12-20 inch totals are given, they can't be talking about Southern  and Western Nassau County, right?

We're at the point now where we start to lose out more and more on what totals we were expecting, since I was hoping we'd all be snow by 4pm or so and now it's looking like even at 0z in an hour we might not be all snow given this new warm push. If we're not by then, I'd say under a foot, maybe we end up with more like 8-12".

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We're at the point now where we start to lose out more and more on what totals we were expecting, since I was hoping we'd all be snow by 4pm or so and now it's looking like even at 0z in an hour we might not be all snow given this new warm push. If we're not by then, I'd say under a foot, maybe we end up with more like 8-12".

 

Rain to snow transitions are always nowcast specials.

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