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February 4th-6th Storm Threat Discussion


Sn0waddict

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No I don't. We'll see though. In most cases like this the cf makes it through the south shore after a small battle

While this is normally true and you have climo on you're side I am beginning to think this isn't a normal situation. The immediate south shore where I am should miss out on crippling ice which is fine with me. If I was up in the north shore hills I would be worried about long term outages. This will knock out the most power since sandy in the zone just south of the sleet area and just north of the coastal front
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The NAM is still showing dynamic cooling near NYC and north at the 850 mb level. You can observe it on this loop..heavier precipitation kicks down the warm air advection before it eventually wins out.

 

http://www.meteo.psu.edu/~fxg1/NAMSFC4_0z/8loop.html

Exactly.  That's why eastern PA, like the Lehigh Valley, started off with light ZR and has now gone over to snow, via dynamic cooling overcoming the weak (at this time) WAA aloft.  Key to the forecast of snow vs. sleet vs. ZR is how that battle goes and when enough warm air works its way in to melt the falling snow and how deep that warm layer is - which, in turn, determines whether the melted falling snow freezes into sleet before it hits the ground or freezes as supercooled ZR upon contacting sub-32F surfaces.  I can't imagine how hard this is to forecast. 

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While this is normally true and you have climo on you're side I am beginning to think this isn't a normal situation. The immediate south shore where I am should miss out on crippling ice which is fine with me. If I was up in the north shore hills I would be worried about long term outages. This will knock out the most power since sandy in the zone just south of the sleet area and just north of the coastal front

Where do you see the coastal front making its most north locations ??? any on this board, please chime in...

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Mt. Holly really worried about power outages:

 

 URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1209 AM EST WED FEB 5 2014

...ANOTHER WINTER STORM WITH SNOW AND ICE WILL AFFECT MUCH OF THE
AREA LATER TONIGHT AND WEDNESDAY...

NJZ009-010-PAZ060>062-101>106-051315-
/O.CON.KPHI.WS.W.0005.000000T0000Z-140205T1800Z/
HUNTERDON-SOMERSET-BERKS-LEHIGH-NORTHAMPTON-WESTERN CHESTER-
EASTERN CHESTER-WESTERN MONTGOMERY-EASTERN MONTGOMERY-UPPER BUCKS-
LOWER BUCKS-
INCLUDING THE CITIES OF...FLEMINGTON...SOMERVILLE...READING...
ALLENTOWN...BETHLEHEM...EASTON...HONEY BROOK...OXFORD...
WEST CHESTER...KENNET SQUARE...COLLEGEVILLE...POTTSTOWN...
NORRISTOWN...LANSDALE...CHALFONT...PERKASIE...MORRISVILLE...
DOYLESTOWN
1209 AM EST WED FEB 5 2014

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 1 PM EST THIS
AFTERNOON...

* HAZARD TYPES...SNOW... SLEET AND FREEZING RAIN.

* SNOW AND SLEET ACCUMULATIONS...1 TO 3 INCHES.

* ICE ACCUMULATIONS...ONE QUARTER TO HALF AN INCH.

* TIMING...SNOW, SLEET AND FREEZING RAINS WILL OVERSPREAD THE
  REGION OVERNIGHT AND MAY FALL HEAVY AT TIMES. THE PRECIPITATION
  WILL CHANGE TO ALL FREEZING RAIN LATE TONIGHT INTO WEDNESDAY
  MORNING. THE PRECIPITATION SHOULD TAPER OFF DURING WEDNESDAY
  AFTERNOON.

* IMPACTS...DANGEROUS TRAVEL CONDITIONS DUE TO SNOW COVERED ROADS
  AND REDUCED VISIBILITY LATE TONIGHT AND WEDNESDAY. THE
  ACCUMULATION OF SNOW IN ADDITION TO SIGNIFICANT ICING WILL BRING
  DOWN TREE LIMBS AND POWER LINES...RESULTING IN POWER OUTAGES. BE
  PREPARED TO LOSE POWER.
THE WEDNESDAY MORNING COMMUTE WILL BE
  GREATLY IMPACTED.

* WINDS...NORTHEAST 5 TO 15 MPH WITH GUSTS UP TO 20 MPH.

* TEMPERATURES...AROUND 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW...
SLEET... AND ICE ARE EXPECTED. THIS WILL MAKE TRAVEL VERY
HAZARDOUS OR IMPOSSIBLE. DUE TO THE COMBINATION OF ACCUMULATING
SNOW THEN ICING... BE PREPARED FOR POSSIBLE POWER OUTAGES.
 

 

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New SPC MD mentioned the ZR/IP difference I was speaking about earlier. The surface cold depth being greater across NNJ suggests more of a sleet threat there initially, while areas just to the south where the sfc cold is shallow but still stubborn will support the ZR threat.

Really interesting storm.

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