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Snow/sleet/frz rain Obs 1-15-13/1-16-13


Allsnow

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ALL who observe for the Mount Holly WFO area:   expectations.  For the OBS later tonight through Noon Wednesday...  we'll be looking for snow accum totals,  ice pellet accum totals and the combo;  as well as glaze thickness on limbs.  The scenario should be mostly snow poconos-far nw nj tapering to freezing rain/freezing drizzle during the day Wed; 

 

Further south...a mish mosh of rain starting out then over to sleet/freezing rain in the 05z-10z time frame back to freezing rain by 12z and then just plain rain after sunrise Wed before tapering to drizzle midday.  the HWOPHI has our current thinking.    Thank you in advance for your very helpful observations.  wd/phi  110P EST 1/15/13

 

If you live in Mt. Holly-land, Walt Drag would prefer you posted to the above criteria (and obviously it would probably help if you posted in the thread on the Philly subforum:  http://www.americanwx.com/bb/index.php/topic/38850-snowsleetfreezing-rain-mess-obs-tuesday-nightwednesday-115-162013/  )

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18z NAM has me with 4" of snow tonight!?!?!?! (assuming 10:1 ratios)

 

Higher resolution map here: http://www.meteo.psu.edu/~fxg1/NAMSFC4US_18z/snow60.gif

 

snow60.gif

 

 

The 18z NAM still has all levels minus the surface below 0C til 10Z or so, a decent amount of QPF is shown before that and remember the NAM can tend to be too slow advancing precipitation in.  If thats correct I would not be surprised if we get a several hour period of snow in areas that nobody is expecting snow.

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It moves the 850 0c line north of the area 6 hours faster than the NAM. Makes for a big difference. It also has about half the total QPF.

I was comparing it to 12z gfs. The 18z is colder to start. If anything it has come into agreement with local wwa and special statements

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Upton just put out a SPS

 

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
839 PM EST TUE JAN 15 2013

...ICY CONDITIONS POSSIBLE IN THE MORNING...

NJZ006-106-108-NYZ072-073-176-161000-
HUDSON-EASTERN ESSEX-EASTERN UNION-NEW YORK (MANHATTAN)-BRONX-
NORTHERN QUEENS-

839 PM EST TUE JAN 15 2013

A LIGHT MIXTURE OF SNOW...SLEET AND RAIN IS EXPECTED TO DEVELOP
ACROSS THE REGION BETWEEN 900 AND 1100 PM. THIS PRECIPITATION WILL
INCREASE IN INTENSITY OVERNIGHT...WITH ANYWHERE FROM A COATING TO
UP TO AN INCH OF SLEET AND SNOW ACCUMULATION EXPECTED ACROSS THE
REGION BY EARLY WEDNESDAY MORNING.

TEMPERATURES WILL LIKELY DROP TO NEAR FREEZING BY EARLY WEDNESDAY
MORNING AS WELL. THIS WILL PRESENT THE POSSIBILITY FOR SOME AREAS
OF FREEZING RAIN FOR THE EARLY MORNING RUSH...PARTICULARLY ACROSS
NORTHERN AND WESTERN PORTIONS OF THE AREA.

MOTORISTS ARE ADVISED TO USE CAUTION TRAVELING OVERNIGHT.
ADDITIONALLY...CHECK THE LATEST NWS FORECAST BEFORE HEADING OUT
FOR THE MORNING COMMUTE...AS ICY ROAD CONDITIONS ARE POSSIBLE.

 

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