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Central PA OMG SNOW thread -- Winter 2016


neff

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Just saw LWX post blizzard warning for their area. Hopefully some more northern trends will occur to get everyone in PA into the snow game.

DC was just upgraded to a blizzard warning. CTP mentioned their concerns for Lancaster getting blizzard conditions, so I really hope that they pull the trigger today. Some people around here are really going to be surprised by the magnitude and duration of the winds.

Also, I just saw the RPM in our weather center and it still crushes everyone up to State College.

Sent from my SM-G925V using Tapatalk

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MODEL DIAGNOSTIC DISCUSSION

NWS WEATHER PREDICTION CENTER COLLEGE PARK MD

1131 AM EST THU JAN 21 2016

VALID JAN 21/1200 UTC THRU JAN 25/0000 UTC

...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR

INGEST...

12Z MODEL EVALUATION WITH PREFERENCES/FORECAST CONFIDENCE

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

CYCLONE SWEEPING THROUGH THE SOUTH/SOUTHEAST...TRANSFERRING TO

COASTAL LOW SAT...TRACKING UP MID-ATLANTIC COAST BY SUN

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PREFERENCE: 12Z GFS AND 00Z ECMWF/CMC BLEND

CONFIDENCE: AVERAGE

OVERALL SYNOPTIC SPREAD LOOKS QUITE AGREEABLE MAINLY DRIVEN BY A

SLOWING OF THE GFS TOWARD THE MEANS AND A QUICKENING OF THE ECMWF

TOWARD ITS MEANS EARLY ON. HOWEVER...DIFFERENCES/SPREAD INCREASE

AFTER 24/00Z MAINLY DRIVEN BY THE HANDLING OF THE PIVOT/SURFACE

OCCLUSION STRENGTH NEAR THE MOUTH OF THE CHESAPEAKE BAY AND/OR

TRANSFER TOWARD THE NEW TRIPLE POINT...MOSTLY AFFECTING THE TIMING

OF THE EXIT OF SENSIBLE WEATHER OVER THE MID-ATLANTIC AND NEW

ENGLAND. GENERALLY THE 12Z NAM WAS A BIT NORTH ACROSS THE SOUTH

AND TRANSFERRED TO THE COAST FASTER AND QUICKER THAN MUCH OF THE

OTHER GUIDANCE...BRING PRECIPITATION IN FASTER AND FURTHER NORTH

ACROSS THE TIGHT GRADIENT OVER S NEW ENGLAND...MAKING IT A BIT

MORE OF AN OUTLIER. THE 00Z UKMET ALONG WITH THE 12Z NAM ARE ON

THE WESTERN SIDE (SLOWER) RETAINING THE SURFACE OCCLUSION A BIT

LONGER THAN THE 00Z ECMWF WHICH RAPIDLY TRANSITIONED TO THE NEW

TRIPLE POINT BY SUNDAY. THE 12Z GFS HAS BACKED OFF THE WESTERN

SOLUTION TRANSFERRING INSTEAD TOWARD THE TRIPLE POINT/NEW

LOW...TRENDING TOWARD THE 00Z ECMWF AND QUITE SIMILAR TO THE 00Z

CMC AND MUCH LESS LIKE ITS 06Z GEFS MEAN. WILL CONTINUE TO

SUPPORT A GFS/ECMWF BLEND THOUGH INCLUDE THE 00Z CMC BUILDING SOME

INCREASED CONFIDENCE PARTICULARLY AFTER 24/00Z; CONFIDENCE OVERALL

IS AVERAGE IN THIS BLEND SOLUTION.

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No snow totals on my point and click

 

Detailed Forecast
This Afternoon
Mostly sunny, with a high near 32. Northwest wind around 9 mph.
Tonight
Partly cloudy, with a low around 19. Northwest wind 3 to 7 mph.
Friday
Partly sunny, with a high near 31. Calm wind becoming northeast around 5 mph in the afternoon.
Friday Night
Snow, mainly after 8pm. Low around 24. Northeast wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 100%.
Saturday
Snow. High near 29. Northeast wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Saturday Night
Snow, mainly before 2am. Low around 18. Chance of precipitation is 100%.
Sunday
A chance of snow before 8am. Mostly sunny, with a high near 32. Chance of precipitation is 50%.
Sunday Night
Partly cloudy, with a low around 16.
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Actually looks a little better south of the turnpike to my ween eyes. Total screw zone remains north of there.

It really cuts down precip north of Rockville it looks like going into the extreme southern tier. Might not matter since we're so close out and qpf might not be a good read on that model now.

 

Hagerstown is down to 1.5" - like I said qpf might not be a good telling sign this late.

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I don't know that it means anything in the end, but it does look like the precip shield over southern Arkansas is much more robust than modeled.

 

The 12z Euro has the main precip shield right now south of Shreveport. In reality, it's mostly north of Shreveport. I think it's almost radar-watching time. If we can get more precip than modeled up to Paducah by tomorrow morning, we might still have a shot.

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The 12z Euro has the main precip shield right now south of Shreveport. In reality, it's mostly north of Shreveport. I think it's almost radar-watching time. If we can get more precip than modeled up to Paducah by tomorrow morning, we might still have a shot.

The euro really has been all over the place with this one. GFS has been consistent not that it is all that much better for us.

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The 12z Euro has the main precip shield right now south of Shreveport. In reality, it's mostly north of Shreveport. I think it's almost radar-watching time. If we can get more precip than modeled up to Paducah by tomorrow morning, we might still have a shot.

Btw, not sure it means anything, but NAM sim radar looks pretty close to reality right now....if that means anything.

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