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Central PA & Fringes - December-January 2014-15


djr5001

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Djr I'm reading it'll be much easier to predict where any wrap snows may develop once it becomes apparent where low is going to slow down or stall. Is there any truth to that?

Well one of the key factors all along that was discussed the past few days was the timing of when the system would become vertically stacked and cut off from the flow.  The trailing short wave energy has been diving in behind this system for the past few hours so becoming cut off is in progress, just not sure if there quite yet.  Current radar looks to be showing a general idea of where the best chance for precip on the backside of the system will occur, but there really is not much in the way of cold air aloft that looks like it will be pulled southward from NY into PA over the next few hours.  I just think the main bulk of precip has already pushed to the north and east of our area and while there may be some banding on the backside, by the time it changes back to snow it may be too late.  By then, 1-2"/6hr rates are not going to be anywhere near heavy enough to accumulate on a wet soggy ground from the current rain showers across this area.

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Winds aloft are just starting to turn more northerly there as the system is strengthening... there is a warm layer above the surface that is killing the snow threat right now...

 

Yea this was always gonna have to be something that depended on heavy precip rates in the deform shield to help win the battle with the extremely marginal temps. So far northeastern PA is a work in progress with getting anything good organized.  As difficult as it has been to nail details down in our area, it's even worse north of PA with that sneaky warm layer. My favorite find this morning up in the New England thread was someone's posting of part of NWS Burlington's (BTV) discussion this morning.

 

.NEAR TERM /THROUGH TONIGHT/...

AS OF 630 AM EST TUESDAY...MINOR ADJUSTMENTS TO MATCH CURRENT

T/TD TRENDS AS OF 600 AM. ALSO RAISED MAX TEMPS 1-2 DEGREES ACROSS

THE SLV TODAY BASED OFF LATEST INFORMATION. REST OF FORECAST

LARGELY UNCHANGED AND WE`RE MOVING INTO A WAIT AND SEE MODE OVER

THE NEXT 12 HOURS TO SEE HOW THIS SYSTEM EVOLVES. YOU CAN SLICE

THE CAKE A HUNDRED DIFFERENT WAYS AND COME UP WITH A HUNDRED

DIFFERENT ANSWERS.

 

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Thanks djr, are we all done with precip.?

 

Here was part of my post from the old thread this morning:

 

Certainly the part of it with the main slug of moisture lifting to our east and north into far eastern PA and upstate NY, but it remains to be seen how much backlash snows we get back into the central counties later tonight and tomorrow. Not that I'm overly excited about the prospects of it but I think there's the potential for some places in the central counties to at least see an inch or two. The European has generally been much more generous with how much precip was thrown back so we'll see what happens. Here was CTP's take this morning.

 

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This storm is Exhibit A as to what happens when coastal storms develop and close off too late. I'm surprised to see even high Poconos elevations with rain though-this is one horrible airmass that needs dynamics and a closed off low aloft to drag down cold air. Down here it's been a deluge all morning, 50 mph wind and I had this two streets away from me. Rain is still coming down in buckets-we have to be over 3" now total. post-76-0-81045900-1418152050_thumb.jpg

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34 and moderate rain up here in Clarks Green. BUST. Location didn't help and elevation didn't help. No mixing right now-plain rain.

 

Update from BGM

 

NEAR TERM /THROUGH TONIGHT/...
1 PM UPDATE...
SFC LOPRES HAS DROPPED DOWN TO NR 1000MB AS IT SPINS OFF THE JERSEY
SHORE. MODERATE TO HVY PCPN IS ONGOING ACRS ERN HALF OF CWA AS
EXPECTED BUT THERMAL PROFILES ARE TOO WARM FOR SNOW. SOME HIGHER
ELEVATION SITES ARE STILL RIGHT AT OR BLO FRZG AS OF 17Z WITH -FZRA
FALLING AT THESE LOCATIONS AND HEARING ABOUT NUMEROUS MOTOR VEHICLE
ACCIDENTS.

PCPN HAS ESSENTIALLY HIT A BRICK WALL AT THE I-81 CORRIDOR AND NOT
EXPECTING THIS TO MV MUCH FURTHER EAST THAN WHERE IT CURRENTLY IS
NOW UNTIL AFT 00Z. DEFORMATION BAND THAT THE MODELS WERE INSISTENT
WUD ROTATE WEST THRU THE EVNG HRS IS NOW LOOKING TO BE A FRACTURED
BAND OF MIXED PCPN.

H9 TEMPS PER LATEST RUC MODEL INDICATING BLYR TEMPS RMNG ISOTHERMAL
THRU 21Z THIS AFTN AND VRY SLOWLY DROPPING BYND THIS TIME. EXPECT A
MIXED BAG THRU BULK OF THE OVRNGT FOR SXNS EAST OF I-81 WITH CLD AIR
BEING PULLED IN FM THE WEST.  ANOTHER WV FCST TO MV THRU NRN ZONES
AFT 06Z TONIGHT AND WITH MOISTURE FM LK ADDED IN EXPECT SVRL INCHES
OF SNOW TO FALL ACRS THE FINGER LKS BY 12Z. STORM TOTAL SNOWFALL
THRU THE OVRNGT IS NOW LOOKING TO BE MEAGER WITH A GNRL INCH OR TWO
ACRS THE BULK OF THE AREA AND POSSIBLY 2-4 INCHES IN HIGHER
ELEVATIONS OF SUSQUEHANNA REGION. WL DRASTICALLY BE REDUCING SNOW
TOTALS FOR THIS EVENT AND WL ALLOW LATER SHIFTS TO MAKE DECISION ON
WHETHER TO CANCEL OR DROP WARNINGS DOWN TO ADVISORY.

 

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LOL...hasn't rained a drop since my last post. I simply cannot believe we got so little so far from this thing. Lately, it's as if someone put a retractable roof over Tamaqua for when we have a major storm in the area.

 

Tamaqua must be Pennsylvania's version of San Diego. 

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