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NYC Area January 26-27 Bomb Discussion and OBS Part 3


earthlight

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mcd0050.gif

MESOSCALE DISCUSSION 0050

NWS STORM PREDICTION CENTER NORMAN OK

0119 PM CST WED JAN 26 2011

AREAS AFFECTED...NERN VA...WASHINGTON DC...CNTRL/NRN MD...MUCH OF

DE...SERN PA...MUCH OF NJ...NEW YORK CITY METRO AREA AND WRN LONG

ISLAND

CONCERNING...HEAVY SNOW

VALID 261919Z - 270115Z

SNOWFALL WILL SPREAD INTO NERN VA...WASHINGTON DC...AND CNTRL/NRN MD

DURING THE 21-00Z TIME PERIOD...WITH RATES OF 1 IN/HR PROBABLE...AND

LOCALLY EXCEEDING 2 IN/HR FOR A BRIEF PERIOD OF TIME. SNOWFALL RATES

OF 1-2 IN/HR WILL THEN SPREAD NEWD ACROSS DE...SERN PA...MUCH OF

NJ...THE NEW YORK CITY METRO AREA AND WRN LONG ISLAND BY 00-03Z.

A PROGRESSIVE UPPER-LEVEL TROUGH LOCATED OVER THE WRN CAROLINAS AT

18Z IS FORECAST TO TAKE ON A NEGATIVE TILT AS IT EJECTS NEWD ACROSS

THE MID ATLANTIC COAST THIS EVENING. AS THIS OCCURS...OFFSHORE

SURFACE CYCLONE WILL MOVE NEWD TOWARD A POSITION S-SE OF LONG ISLAND

BY 03Z. MODEL FORECAST SOUNDINGS INDICATE THERMODYNAMIC PROFILES

ALONG AND S OF A LINE FROM NRN VA TO CNTRL NJ WILL INITIALLY SUPPORT

RAIN /POSSIBLY MIXED WITH FREEZING RAIN AND SLEET/. HOWEVER...THE

COMBINATION OF STRONG DEEP LAYER ASCENT AND STRENGTHENING LOW-LEVEL

CAA OCCURRING IN THE WAKE OF THE DEPARTING SURFACE LOW WILL FAVOR A

QUICK TRANSITION TO SNOW AS THE PRIMARY SHIELD OF PRECIPITATION

TRANSLATES NEWD DURING THE LATE AFTERNOON INTO THE EARLY NIGHT.

MODEL GUIDANCE INDICATES STRONG SYNOPTIC-SCALE ASCENT WILL BECOME

JUXTAPOSED WITH A ZONE OF STRENGTHENING LOW-MIDLEVEL FRONTOGENESIS

ALIGNED FROM NERN VA NEWD INTO NEW ENGLAND...AIDING IN INTENSE UVV/S

THROUGH THE DENDRITIC GROWTH ZONE. PRECIPITATION RATES MAY BE

FURTHER ENHANCED BY WEAK CONVECTIVE INSTABILITY ROOTED IN THE

700-600 MB LAYER. HEAVY SNOWFALL RATES ARE EXPECTED TO DEVELOP OVER

NERN VA...WASHINGTON DC...AND CNTRL/NRN MD BY 21-00Z. AS THE UPPER

TROUGH MOVES TOWARD THE MID ATLANTIC COAST DURING THE 00-03Z TIME

PERIOD...STRONG ASCENT ACCOMPANIED BY THE DEVELOPMENT OF HEAVY

SNOWFALL RATES WILL SPREAD NEWD ACROSS DE...SERN PA...NJ...AND

EVENTUALLY THE NEW YORK CITY METRO AREA AND WRN LONG ISLAND.

..GARNER.. 01/26/2011

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mcd0050.gif

MESOSCALE DISCUSSION 0050

NWS STORM PREDICTION CENTER NORMAN OK

0119 PM CST WED JAN 26 2011

AREAS AFFECTED...NERN VA...WASHINGTON DC...CNTRL/NRN MD...MUCH OF

DE...SERN PA...MUCH OF NJ...NEW YORK CITY METRO AREA AND WRN LONG

ISLAND

CONCERNING...HEAVY SNOW

VALID 261919Z - 270115Z

SNOWFALL WILL SPREAD INTO NERN VA...WASHINGTON DC...AND CNTRL/NRN MD

DURING THE 21-00Z TIME PERIOD...WITH RATES OF 1 IN/HR PROBABLE...AND

LOCALLY EXCEEDING 2 IN/HR FOR A BRIEF PERIOD OF TIME. SNOWFALL RATES

OF 1-2 IN/HR WILL THEN SPREAD NEWD ACROSS DE...SERN PA...MUCH OF

NJ...THE NEW YORK CITY METRO AREA AND WRN LONG ISLAND BY 00-03Z.

A PROGRESSIVE UPPER-LEVEL TROUGH LOCATED OVER THE WRN CAROLINAS AT

18Z IS FORECAST TO TAKE ON A NEGATIVE TILT AS IT EJECTS NEWD ACROSS

THE MID ATLANTIC COAST THIS EVENING. AS THIS OCCURS...OFFSHORE

SURFACE CYCLONE WILL MOVE NEWD TOWARD A POSITION S-SE OF LONG ISLAND

BY 03Z. MODEL FORECAST SOUNDINGS INDICATE THERMODYNAMIC PROFILES

ALONG AND S OF A LINE FROM NRN VA TO CNTRL NJ WILL INITIALLY SUPPORT

RAIN /POSSIBLY MIXED WITH FREEZING RAIN AND SLEET/. HOWEVER...THE

COMBINATION OF STRONG DEEP LAYER ASCENT AND STRENGTHENING LOW-LEVEL

CAA OCCURRING IN THE WAKE OF THE DEPARTING SURFACE LOW WILL FAVOR A

QUICK TRANSITION TO SNOW AS THE PRIMARY SHIELD OF PRECIPITATION

TRANSLATES NEWD DURING THE LATE AFTERNOON INTO THE EARLY NIGHT.

MODEL GUIDANCE INDICATES STRONG SYNOPTIC-SCALE ASCENT WILL BECOME

JUXTAPOSED WITH A ZONE OF STRENGTHENING LOW-MIDLEVEL FRONTOGENESIS

ALIGNED FROM NERN VA NEWD INTO NEW ENGLAND...AIDING IN INTENSE UVV/S

THROUGH THE DENDRITIC GROWTH ZONE. PRECIPITATION RATES MAY BE

FURTHER ENHANCED BY WEAK CONVECTIVE INSTABILITY ROOTED IN THE

700-600 MB LAYER. HEAVY SNOWFALL RATES ARE EXPECTED TO DEVELOP OVER

NERN VA...WASHINGTON DC...AND CNTRL/NRN MD BY 21-00Z. AS THE UPPER

TROUGH MOVES TOWARD THE MID ATLANTIC COAST DURING THE 00-03Z TIME

PERIOD...STRONG ASCENT ACCOMPANIED BY THE DEVELOPMENT OF HEAVY

SNOWFALL RATES WILL SPREAD NEWD ACROSS DE...SERN PA...NJ...AND

EVENTUALLY THE NEW YORK CITY METRO AREA AND WRN LONG ISLAND.

..GARNER.. 01/26/2011

Looking at radar/obs I would be VERY surprised if the heavy CCB/Deform precip misses up to the SE. If anything I would be more worried about some of the precip being wasted as rain/sleet at the start. Anything could still happen but I think NW Jersey is probably ok with round #2.

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Up in white plains now but before I left my house in bronxville I measured 5.6 inches. Its snowing at a moderate clip here in white plains

Wow. I've been busy all day and haven't followed the accumulations to the south. Up in Putnam roads and car surfaces are wet with just a dusting on snowcovered ground. 31.4F.

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mcd0050.gif

MESOSCALE DISCUSSION 0050

NWS STORM PREDICTION CENTER NORMAN OK

0119 PM CST WED JAN 26 2011

AREAS AFFECTED...NERN VA...WASHINGTON DC...CNTRL/NRN MD...MUCH OF

DE...SERN PA...MUCH OF NJ...NEW YORK CITY METRO AREA AND WRN LONG

ISLAND

CONCERNING...HEAVY SNOW

VALID 261919Z - 270115Z

SNOWFALL WILL SPREAD INTO NERN VA...WASHINGTON DC...AND CNTRL/NRN MD

DURING THE 21-00Z TIME PERIOD...WITH RATES OF 1 IN/HR PROBABLE...AND

LOCALLY EXCEEDING 2 IN/HR FOR A BRIEF PERIOD OF TIME. SNOWFALL RATES

OF 1-2 IN/HR WILL THEN SPREAD NEWD ACROSS DE...SERN PA...MUCH OF

NJ...THE NEW YORK CITY METRO AREA AND WRN LONG ISLAND BY 00-03Z.

A PROGRESSIVE UPPER-LEVEL TROUGH LOCATED OVER THE WRN CAROLINAS AT

18Z IS FORECAST TO TAKE ON A NEGATIVE TILT AS IT EJECTS NEWD ACROSS

THE MID ATLANTIC COAST THIS EVENING. AS THIS OCCURS...OFFSHORE

SURFACE CYCLONE WILL MOVE NEWD TOWARD A POSITION S-SE OF LONG ISLAND

BY 03Z. MODEL FORECAST SOUNDINGS INDICATE THERMODYNAMIC PROFILES

ALONG AND S OF A LINE FROM NRN VA TO CNTRL NJ WILL INITIALLY SUPPORT

RAIN /POSSIBLY MIXED WITH FREEZING RAIN AND SLEET/. HOWEVER...THE

COMBINATION OF STRONG DEEP LAYER ASCENT AND STRENGTHENING LOW-LEVEL

CAA OCCURRING IN THE WAKE OF THE DEPARTING SURFACE LOW WILL FAVOR A

QUICK TRANSITION TO SNOW AS THE PRIMARY SHIELD OF PRECIPITATION

TRANSLATES NEWD DURING THE LATE AFTERNOON INTO THE EARLY NIGHT.

MODEL GUIDANCE INDICATES STRONG SYNOPTIC-SCALE ASCENT WILL BECOME

JUXTAPOSED WITH A ZONE OF STRENGTHENING LOW-MIDLEVEL FRONTOGENESIS

ALIGNED FROM NERN VA NEWD INTO NEW ENGLAND...AIDING IN INTENSE UVV/S

THROUGH THE DENDRITIC GROWTH ZONE. PRECIPITATION RATES MAY BE

FURTHER ENHANCED BY WEAK CONVECTIVE INSTABILITY ROOTED IN THE

700-600 MB LAYER. HEAVY SNOWFALL RATES ARE EXPECTED TO DEVELOP OVER

NERN VA...WASHINGTON DC...AND CNTRL/NRN MD BY 21-00Z. AS THE UPPER

TROUGH MOVES TOWARD THE MID ATLANTIC COAST DURING THE 00-03Z TIME

PERIOD...STRONG ASCENT ACCOMPANIED BY THE DEVELOPMENT OF HEAVY

SNOWFALL RATES WILL SPREAD NEWD ACROSS DE...SERN PA...NJ...AND

EVENTUALLY THE NEW YORK CITY METRO AREA AND WRN LONG ISLAND.

..GARNER.. 01/26/2011

:weenie:

Flurries in Manhattan are now transiitioning to light snow once again. Gonna go out and measure soon.

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A little off topic, bit appears the ecm holds with a cutter next tue-wed. GGEm a coastal, GFS weak system.

2PM

Monroe, NJ : 4"

However it does show some snow before a changeover based on QPF maps on the free site.

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