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Central PA & The Fringes - February 2014 III


PennMan

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HPC was like never mind on GFS/NAM blend form 12Z.. lets go back to UKMET/Euro

 

EASTERN U.S. CYCLONE AND WINTER STORM
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: BLEND OF 12Z UKMET / 12Z EC MEAN
CONFIDENCE: AVERAGE

THE 00Z NAM IS DIFFERENT EARLY IN THE SHORT RANGE...REGARDING A
NRN STREAM SHORTWAVE CURRENTLY ENTERING BRITISH COLUMBIA EARLY
THIS MORNING. THIS CONTINUES DOWNSTREAM WITH A SLOWER/NORTHWARD
DISPLACED MID-LEVEL JET STREAK BY WED MORNING OVER THE CNTRL HIGH
PLAINS...A FEATURE WHICH HOLDS GOOD CONTINUITY IN THE
GFS/ECMWF/UKMET. THIS RESULTS IN A LESS AMPLIFIED UPPER TROUGH IN
THE NAM BY EARLY THU OVER THE CNTRL APPALACHIANS.

THE ENSEMBLE SCATTER LOW PLOTS ARE MORE TIGHTLY CLUSTERED THAN
YESTERDAY...WHICH SHOULD BE EXPECTED...BUT HAVE MADE A WHOLESALE
SHIFT SLOWER AND WEST. THE ECMWF MEMBERS ARE ON THE WEST SIDE OF
THE LOW PLOT ENVELOPE...FOLLOWED BY THE GEFS/CMC MEMBERS JUST
RIGHT OF THE ECMWF MEMBER CLUSTER DURING THE DAY ON THURSDAY. THIS
PRECLUDES USE OF THE 12Z CMC WHICH IS MUCH FASTER THAN THE
CONSENSUS. DUE TO THE ECMWF AND ITS MEAN BEING ON THE WESTERN SIDE
OF THE AVAILABLE GUIDANCE WITH THE SURFACE LOW WHICH TRACKS UP THE
EAST COAST... DESPITE THE WESTWARD TREND SEEN IN ALL OF THE
MODELS...THE SAFER PLACE IS JUST A BIT EAST OF THE ECMWF. THE 00Z
GFS POSITION LOOKS REASONABLE...BUT APPEARS TOO WEAK AND MAY HAVE
SOME CONVECTIVE FEEDBACK WHICH DEVELOPS EARLY THURSDAY MORNING.
THE 12Z UKMET APPEARS TO BE A DECENT COMPROMISE WHEN BLENDED WITH
THE 12Z EC MEAN...WITH THE EC MEAN A BIT EAST OF THE OPERATIONAL
ECMWF.

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Damn it, shunts east at the end. 5-yard pickup by the GGEM before the NYC tackles swarmed on it.

It changes me over to rain at the end, but not after a huge amount of front end snow.

 

The storm seems to occlude and the kicker catches up with it. The UK keeps the kicker further west and slower. The GFS/NAM are quicker with it. We probably won't know for sure until late tomorrow what the fate will be with that, and therefore all of our fates.

 

I'll bet on the Euro having an amped run again based on the UK/GGEM, but maybe a hair less so than 12z. At least that's my hope. :P

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Hour 60 the .1-.25" line runs in an arc from roughly Morgantown, WV to Altoona to Scranton. 

 

Hour 66 .1-.25" encompasses places like UNV and IPT and those two places are still on the end of the .1-.25 for the 72 hour frame. 

 

Eastern Penn getting hit good again. 

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That run was sick. If that precip shield comes NW like 50 miles, dear god. Just NW of DC this run gets 2.4" qpf lol.

Precip fields tend to become more expansive and less consolidated as a dynamic event like this nears. Even if there is little movement in the bullseye it is likely to expand in coverage.
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