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HF, I'm sure you've seen the current NHC discussion (excerpt): THE INITIAL MOTION IS NOW 280/13. FRANCES REMAINS ON THE SOUTH SIDE OF A STRONG RIDGE OVER THE WESTERN ATLANTIC. LARGE-SCALE MODELS ALL FORECAST THE RIDGE TO WEAKEN DURING THE FORECAST PERIOD...BUT THERE ARE SIGNIFICANT DIFFERENCES IN THE DETAILS WHICH HAVE MAJOR IMPLICATIONS FOR WHERE FRANCES WILL END UP. DATA FROM THE RECENT SYNOPTIC SURVEILLANCE MISSION HAD SOME INTERESTING EFFECTS ON THE DYNAMICAL MODELS. THE GFS...WHICH HAS BEEN A LEFT OUTLIER MOST OF THE TIME...HAS SHIFTED WELL TO THE RIGHT AND IS NOW A RIGHT OUTLIER...MOVING FRANCES NORTHWARD ALONG 77-78W AFTER 72 HR. THE NOGAPS...WHICH HAS BEEN A RIGHT OUTLIER...IS NOW A LEFT OUTLIER CALLING FOR LANDFALL IN SOUTHEASTERN FLORIDA. THE GFDL AND UKMET HAVE BOTH SHIFTED THEIR TRACKS TO THE RIGHT AFTER 72 HR. GIVEN THE LARGE CHANGES IN JUST ONE CYCLE...THE OFFICIAL FORECAST WILL NOT CHANGE MUCH AT ALL...BASICALLY BEING AN UPDATE OF THE PREVIOUS PACKAGE. IT IS DOWN THE CENTER OF THE MODEL GUIDANCE UP TO 72 HR AND ALONG THE LEFT SIDE THEREAFTER. The qyestion is; Why do you suppose the NHC is favoring the left side after 72hrs? Is there some admission that it is moving West rapidly and not likely to be able to turn fast enough to follow the GFS or even the UKMET which has been doing a good job so far? |