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Central PA/fringes of MD - December 2013 continued


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One thing I remember from my early Eastern days is, "It snows tomorrow where it snowed yesterday." Essentially meaning in active patterns if the setup is somewhat similar in location or temp guidance you're best off going with what you received earlier.

 

If that holds true, the York to Chambersburg area will score very well while those north of the Turnpike before you get into the mountains will see very little in the way of accumulation.

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You going a bit conservative, Mallow? This was just released from Mount Holly a short time ago. Extrapolating westward, Schuylkill County at least, appears to be in the 6-8 range. CTP doesn't have one out yet.

 

attachicon.gifStormTotalSnowWebFcst.jpg

I little off topic how do you get those snow maps from NWS? in the LSV area.

Thanks much.

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I little off topic how do you get those snow maps from NWS? in the LSV area.

Thanks much.

 

They are in different places on the web sites so I just figured I'd give you the links.

 

For State College:

http://www.erh.noaa.gov/ctp/features/snowmaps/index.php?tab=forecast

 

For Mount Holly:

http://www.erh.noaa.gov/phi/WinterDSS.shtml

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Keep in mind how poorly I did with my last map... :P

 

20131213snowcast.png

 

You going a bit conservative, Mallow? This was just released from Mount Holly a short time ago. Extrapolating westward, Schuylkill County at least, appears to be in the 6-8 range. CTP doesn't have one out yet.

 

post-317-0-90888800-1386882451_thumb.jpg

Lancaster and north looks like it's in the 4-6 range, millersville might be as well.

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Yes. :P

 

Worried about mixing and ratios (not so much mixing ratios ;) )

My rule always is that if the 850 low goes north of you in latitude, sleet is going to at least mix in. I would think therefore that most of the state will have some kind of mixing issues, even if it's very late in the event. I'd say NWS's 4-6" call is good for the I-80 down to I-76 corridor. Maybe more like 3-5" around Harrisburg.

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Good discussion from CTP... dry air will be an issue, but could lead to higher ratios?  Have to like the trends at this point overall

 

WITH COLDER AIR ENTRENCHED OVER CENTRAL PA...MODELS CONTINUE TO
FORECAST A PRIMARILY SNOW EVENT FOR MUCH OF CENTRAL PA...WITH A
CHANGEOVER TO SLEET/FREEZING RAIN POSSIBLE OVER THE SRN 1/3 OF THE
CWA LATER SAT INTO SAT NGT AS SOME WARMER AIR NOSES IN FROM THE
SOUTHWEST. 24-HOUR SNOW ACCUMULATIONS OF AROUND 6" SEEM LIKELY
ALONG AND N OF I-80 WITH 850MB TEMPS REMAINING -3C OR COLDER. SREF
ALSO SUPPORTS THIS. THOUGH QPF TOTALS OF ABOUT 0.50-0.60 INCHES
FORECAST...TOTALS MAY BE HAMPERED BY LACK OF PHASING BETWEEN THE
LEAD SOUTHERN STREAM WAVE EJECTING OFFSHORE AND THE NRN STREAM
TROUGH MOVING ACRS THE GREAT LAKES ABOUT 12 HOURS LATER. THE LACK
OF A CLOSED 700/500 MB CIRCULATION IS ALSO EXPECTED TO LIMIT THE
AMOUNT OF DEEP MOISTURE ADVECTION/LIFT ACROSS THE REGION. BUT
DRIER ARCTIC AIR TO THE NORTH MAY PRODUCE A FLUFFIER HIGHER SNOW
TO WATER RATIO WHICH COULD BRING AMOUNTS A BIT HIGHER. BUT WITH
LONGER DURATION OF EVENT AND SOMEWHAT GRADUAL ACCUMULATION
RATES...WILL HOLD OFF ON ISSUING A WATCH WITH THIS PACKAGE...
THOUGH ADVISORIES WILL LIKELY BE REQUIRED AS EVENT APPROACHES.
FURTHER SOUTH...SNOW POSSIBLY MIXING WITH/CHANGING TO SLEET/FZRA
OVER THE SOUTH-CENTRAL ZONES AS WARM AIR TRIES TO SURGE IN FROM
THE SOUTH. SREF/GEFS AND WPC PROBS SHOW LIGHT ICE AMTS AROUND 0.10
MAINLY OVER THE LAURELS AND LOWER SUSQ VALLEY.

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