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FORECAST DISCUSSION: "The Storm They Couldn't Punt" 2/7-2/9


HM

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Dynamic enough for thundersnow?

 

 

I noticed the advisory mentioned the possibility of this.

 

* TIMING...RAIN FRIDAY WILL CHANGE TO WET SNOW LATE IN THE DAY  FRIDAY OR FRIDAY EVENING. THERE MAY BE A PERIOD OF ONE TO 2 INCH  PER HOUR ACCUMULATIONS FRIDAY NIGHT. NORTHERLY WINDS WILL GUST  30 MPH CAUSING SOME BLOWING AND DRIFTING. THERE IS A SMALL  CHANCE FOR A THUNDERSTORM WITH THE SNOW.
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Is there time for this to trend even better for the area? Or have we basically seen all the trending we will with this one?

 

 

0z is huge......In all seriousness though i think the general idea of the storm is set.....but there could always be last minute adjustment for better or worse.

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Just curious why the WSW in Ches Co is like that.  Would have thought they would split county north\south. 

 

western half is more in tune with Berks & Upper Mont.  Chester County isn't the cleanest county to cut for a zone unlike Bucks & Mont (IMO).

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I'm guessing WSW will be extended south later as well.

 

 

SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/    **IMPOSING WINTER STORM TO PRODUCE HAZARDOUS ACCUMULATIONS OF SNOW   FRIDAY AND ESPECIALLY FRIDAY NIGHT OVER MOST OF OUR AREA**    WE'VE HAD AN EASTERN REGION CONFERENCE CALL WITH NCEP AT NOON AND   THE 12Z ECMWF CONTINUES HEAVY FOR OUR AREA.     WARNINGS AND ADVISORIES HAVE BEEN ISSUED. PLEASE BE AWARE THAT   BANDING OF SNOW WILL CAUSE VARYING AMOUNTS WITHIN THE PREDICTED   VALUES AND THAT ITS POSSIBLE WE'LL NEED TO ADJUST THE AMOUNTS LOWER   IN LATER FORECASTS....ESPECIALLY SOUTH. THATS ONE REASON WHY NO WARNING  PHL AND NO ADVY IN E MD AND CENTRAL DE. JUST UNSURE HOW MUCH COMMA  HEAD BACKWASH CAN OCCUR FROM ALLENTOWN TO ATLANTIC CITY SOUTHWARD.    FOR NOW...THIS SHOULD BALL PARK.    WHILE THIS SHOULD NOT BE QUITE AS FIERCE AS DEC 26 2010... ITS STILL  GOING BE A MAJOR EVENT FOR THE REGION ALONG AND N OF I78...ESPECIALLY  FRIDAY NIGHT FOR NNJ AND NE PA.    IF THIS DETERMINISTIC FORECAST PANS OUT...SOME ROADS MAY BE BRIEFLY  IMPASSABLE FRIDAY NIGHT DUE TO ACCIDENTS OR INTENSE SNOW FALL RATES.    FALL 12Z MODELS EXCEPT...THE LIGHTER UKMET...ARE IN GENERAL AGREEMENT.  THIS INCLUDES THE 18Z NAM.    THIS STORM DEPENDS ON PHASING OF THE GTLKS SHORT WAVE WITH THE   FEEDER WARMER SHORT WAVE MOVING OFF THE MID ATLC COAST. ALL DELICATE   AND SUBJECT TO CHANGE BUT LEANING...COLDER AND SNOWIER.    WARNINGS AND ADVISORY AMOUNTS MAY NEED ADJUSTMENT IN FUTURE   FORECASTS.    
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I think it will be interesting how many get caught "unaware"or "off guard" as so many media forecasts were for a mainly rain event here in se pa. IF the bad stuff holds off till 3 pm then probaly no big deal, but if we wake up to issues - which i think is possible - then lots of comments about "i didn,t expect this."

I have spoken to several this pm expecting all or almost all rain.

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I just noticed that when checking the WWA for Chester County, PA (work). They mention Cherry Hill, NJ in the WWA 2-5", and Moorsetown and Mt Laurel, NJ in the WSW 6-8". Meh, I'm sure it'll get tweaked once or twice before tomorrow...

Yeah. I probably should be under a warning, yet I'm not... yet. Whatever, it isn't a dusting to an inch.

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I just noticed that when checking the WWA for Chester County, PA (work). They mention Cherry Hill, NJ in the WWA 2-5", and Moorsetown and Mt Laurel, NJ in the WSW 6-8". Meh, I'm sure it'll get tweaked once or twice before tomorrow...

 

They have to put the boundary between the WWAs and the WSWs somewhere.  In South Jersey, PHI made their best guess as the border between Camden and Burlington County.  Cherry Hill and Mount Laurel share a long border, but Cherry Hill happens to be in Camden County and Mt. Laurel happens to be in Burlington County, hence the difference.  Unless the guys at Mt. Holly are truly psychic (and they ARE darn good, but, to the best of my knowledge, not psychic), presumably there won't be that huge a difference between the two once the snow starts flying.  Ideally (because I live there), Cherry Hill will get into the heavier stuff, but it is just as likely that Mt. Laurel gets a bit less than the WSW is calling for.  As you say, look for plenty of tweaks as the system develops... hopefully positive tweaks for all of us.      

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Latest Wxsim on timing etc. is light snow/rain mix by 6am with heavy snow kicking in around 3pm - looks to be heaviest thru midnight and then light snow through about 5am Saturday. I am a little concerned that about 0.50" of liquid falls before the 3pm switch to S+ - I am not convinced that temps rise thru the night with DPs so low. So could be some snow and ice accumulation in that 1/2 inch of liquid. Thereafter from 3pm on the Wxsim program kicks out between 8" to 10" of snow. 

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Here's my first call map I made for the Central PA thread. I make these maps with a focus on all of PA (and a bit of surrounding) so figured I'd share since you Philly/LV/central&northern NJ folks look to do alot better than us back in central and western PA haha. 

 

post-1507-0-19238200-1360282843_thumb.gi

 

 

 

 

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Here's my first call map I made for the Central PA thread. I make these maps with a focus on all of PA (and a bit of surrounding) so figured I'd share since you Philly/LV/central&northern NJ folks look to do alot better than us back in central and western PA haha. 

 

attachicon.gifSlide1.gif

 

I think this is a pretty good call. Although, I think that 2-5, 5-8, 8-12 gradient should be a little tighter and pushed a little farther east. Going to be one heck of an accumulation gradient.

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