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Central PA & The Fringes - February 2014 III


PennMan

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Not good news.

 

It's not necessarily bad news, it's just that the SREFs are still not very useful for the central counties where we of course could really use a solid consensus between the foreign guidance and the US guidance with regards to precip extent. Much better agreement exists for the LSV and that is why CTP opted for the warnings in those three counties. The majority of members by in large are still going the way of the NAM op. 

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This is pretty awesome. 

 

Recon plane is currently collecting data

 

000
NOUS42 KNHC 101620
REPRPD
WEATHER RECONNAISSANCE FLIGHTS
CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.
1120 AM EST MON 10 FEBRUARY 2014
SUBJECT: WINTER STORM PLAN OF THE DAY (WSPOD)
VALID 11/1100Z TO 12/1100Z FEBRUARY 2014
WSPOD NUMBER.....13-073

I. ATLANTIC REQUIREMENTS
1. FLIGHT 0NE -- TEAL 71--
A. A66/ DROP 9(28.2N 93.8W)/ 12/0000Z
B. AFXXX 05WSA TRACK66
C. 11/2000Z
D. 10 DROPS ON TRACK AS PUBLISHED
E. AS HIGH AS POSSIBLE/ 12/0200Z

 
 
 

 

 
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A good short term disco from CTP:

 

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY/...
MAIN FOCUS IS ON HEAVY SNOW POTENTIAL WEDNESDAY NIGHT AND
THURSDAY. 12Z GUIDANCE CYCLE HAS INCREASED CONFIDENCE IN HEAVY
SNOW THREAT FOR PORTIONS OF THE LOWER SUSQUEHANNA RIVER VALLEY
WITH EARLIER WATCHES NOW UPGRADED TO WARNINGS FOR LANCASTER YORK
AND ADAMS COUNTIES. POOR MAN`S ENSEMBLE OF CMC/NAM/GFS STILL
FAVOR...PERHAPS AT THEIR PERIL...AN OFFSHORE TRACK WITH
SIGNIFICANTLY LOWER QPF THAN THEIR EUROPEAN COUNTERPART.
THE
CHALLENGE FOR OUR AREA IS HANDLING THE SHARP GRADIENT ON THE
WESTERN AND NORTHERN SIDE OF THE SFC LOW TRACK AND RESOLVING THE
SIGNIFICANT DIFFERENCES IN LIQUID OUTPUT FROM THESE TWO CAMPS.

STRONG NORTHERN STREAM SHORTWAVE DROPPING SOUTHEASTWARD FROM THE
NORTHERN ROCKIES THIS AFTERNOON WILL DEEPEN A SFC LOW ALONG THE
SOUTHEAST TEXAS OR LOUISIANA GULF COAST LATE TONIGHT AND WEDNESDAY
MORNING. EXTENT AND INTENSITY OF RESULTANT DEEP CONVECTION WILL
LARGELY DETERMINE HOW CLOSE TO THE COAST THE SFC LOW CAN TRACK.
LATEST ECMWF HAS TRENDED SLIGHTLY FARTHER WEST WITH THE SFC LOW
TRACK PLACING A LARGER PORTION OF CENTRAL PA INTO THE COLD
CONVEYOR BELT SNOWFALL THURSDAY. NOT READY TO COMPLETELY BUY OFF
ON THIS SOLUTION...BUT HAVE WEIGHTED PREVIOUS QPF AND SNOWFALL
20% OF THE EUROPEAN SOLUTION WHICH JOGS OUR SNOWFALL TOTALS TO THE
WEST AND NORTH.
WITH THE INCREASED CONFIDENCE...UPGRADED WATCHES
TO WARNINGS FOR LANCASTER YORK AND ADAMS...AND ISSUED WATCHES FOR
SCHUYLKILL LEBANON DAUPHIN PERRY CUMBLERAND FRANKLIN FULTON AND
BEDFORD COUNTIES. ADVISORY CRITERIA SNOWFALL WILL BE POSSIBLE
SOUTH AND EAST OF STATE COLLEGE AND JOHNSTOWN...BUT NOT ENOUGH
CONFIDENCE ON THE PLACEMENT YET FOR THESE AREAS AND THERE IS STILL
PLENTY OF TIME FOR THESE DETAILS TO BE WORKED OUT.

SNOWFALL SHOULD LAST A GOOD PORTION OF THURSDAY OVER THE EAST
BEFORE TAPERING OFF...PERHAPS AS A PERIOD OF FREEZING RAIN OVER
SOUTHERN LANCASTER AND YORK COUNTIES INVOF THE SFC LOW TRACK...
WHICH MAY DRY SLOT THE PIEDMONT REGION. STILL MANY DETAILS TO WORK
OUT WITH THIS SYSTEM...BUT TREND IS FOR RAMPING UP SNOW TOTALS
SLIGHTLY AND *PERHAPS* A MORE WESTERN SFC LOW TRACK AS PER ECMWF.
HAVE NOT COMPLETELY BOUGHT OFF ON ECMWF DETAILS...BUT ITS
CONSISTENCY AND POTENCY ARE UNDENIABLE AT THIS TIME. SHOULD THE
WESTWARD TREND CONTINUE...WE MAY NEED TO EXPAND WATCHES NORTHWARD
EVEN FURTHER
...ANOTHER ARGUMENT FOR HOLDING OFF ON ADVISORY
ISSUANCES ON THIS TIME TO ALLOW FLEXIBILITY TO FUTURE (EVENING AND
MIDNIGHT) SHIFTS.

 

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