MODEL DIAGNOSTIC DISCUSSION NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP
DEVELOPING CYCLONE OFF THE SOUTHEAST COAST...
THE NAM IS FURTHER TO THE S AND W THAN THE GFS THRU MUCH OF THE PERIOD AND IS AROUND 25 MB DEEPER AT THE SFC BY THE END OF DAY 2. THE 00Z ECMWF/12Z CMC/UKMET GLOBAL ARE FASTER THAN THE NAM TO CARRY THE SYSTEM WWD...BUT THE ECMWF SOLUTION IS DISCOUNTED GIVEN THAT ITS 12HR FORECAST SHOWED A POSITION WELL WEST OF WHAT WAS OBSERVED AT 12Z...WHILE THE CMC/UKMET INITIALIZED THE SYSTEM TOO FAR W AS WELL. GIVEN THE POOR INITIALIZATIONS OF THE MODELS...DO NOT HAVE A GREAT DEAL OF CONFIDENCE IN ANY PARTICULAR SOLUTION...
BUT IN COMPARISON TO THE REMAINING MODELS THE GFS APPEARS TOO WEAK WITH THE MID LVL RIDGE TO THE N OF THE SYSTEM AND IS THEREFORE TOO SLOW TO MOVE THE SYSTEM WWD...WHILE ALLOWING THE SYSTEM TO MOVE TOO FAR TO THE N. A MORE PROGRESSIVE/AMPLIFIED/SLY SOLUTION THAN THE GFS WOULD BETTER FIT THE MODEL CONSENSUS. NOT READY TO BUY INTO A SOLUTION AS PROGRESSIVE AS THE ECMWF GIVEN ITS POOR FORECAST OR THE CMC/UKMET GIVEN THEIR POOR INITIALIZATIONS.
NOT SURE A SYSTEM AS DEEP AS THE NAM IS IN ORDER EITHER GIVEN ITS TENDENCY TO OVER-AMPLIFY ANY SYSTEM OF A TROPICAL NATURE. THAT SAID...THE CURRENT HPC/TPC THINKING IS FOR A TRACK FURTHER TO S AND DEEPER THAN THE GFS...BUT NOT QUITE AS PROGRESSIVE AS THE CMC GLOBAL/UKMET/00Z ECMWF.
THERE ARE ALSO ISSUES WITH THE STRENGTH/WRN EXTENT OF THE MID LVL RIDGE OVER THE WRN ATLC AND ERN/SERN CONUS. TELECONNECTION-FAVORED UPSTREAM CONFIGURATION FAVORS A HEALTHY SERN RIDGE CLOSER TO WHAT IS DEPICTED IN THE ECMWF/RECENT NCEP MEANS/06Z-12Z GFS. GUIDANCE CONTINUES TO SHOW THE POTENTIAL FOR LOW PRESSURE OFF THE SERN COAST TO DEVELOP AND LIFT NWD ALONG THE EAST COAST. THE 12Z GFS HAS SHIFTED NOTICEABLY WWD TOWARD THE DOMINANT CLUSTER OF OTHER MODEL GUIDANCE.
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