Earlier, I wrote about the radical track shift on some of today’s computer guidance on Hurricane Wilma. It looks like the Hurricane Center has caught on to that.
PRESSURE SYSTEM IN THE GREAT LAKES REGION. ALL THREE OF THESE MODELS HAVE BACKED OFF OF THIS SOLUTION…WITH THE GFDL SHOWING AN EXTREME CHANGE…WITH ITS 5-DAY POSITION SHIFTING A MERE 1650 NMI FROM ITS PREVIOUS POSITION IN MAINE TO THE WESTERN TIP OF CUBA.
THERE IS ALMOST AS MUCH SPREAD IN THE 5-DAY POSITIONS OF THE 12Z GFS ENSEMBLE MEMBERS…WHICH RANGE FROM THE YUCATAN TO WELL EAST OF THE DELMARVA PENINSULA. WHAT THIS ILLUSTRATES IS THE EXTREME SENSITIVITY OF WILMA’S FUTURE TRACK TO ITS INTERACTION WITH THE GREAT LAKES LOW. OVER THE PAST COUPLE OF DAYS…WILMA HAS BEEN MOVING SLIGHTLY TO THE LEFT OR SOUTH OF THE MODEL GUIDANCE…AND THE LEFT-MOST OF THE GUIDANCE SOLUTIONS ARE NOW SHOWING WILMA DELAYING OR MISSING THE CONNECTION WITH THE LOW. I HAVE SLOWED THE OFFICIAL FORECAST JUST A LITTLE BIT AT THIS TIME…BUT IF WILMA CONTINUES TO MOVE MORE TO THE LEFT THAN EXPECTED…SUBSTANTIAL CHANGES TO THE OFFICIAL FORECAST MAY HAVE TO BE MADE DOWN THE LINE. NEEDLESS TO SAY…CONFIDENCE IN THE FORECAST TRACK…ESPECIALLY THE TIMING…HAS DECREASED CONSIDERABLY.
Remind me not to switch jobs with the forecasters at the Hurricane Center. This is tough stuff with a lot on the line.
Their typical response to radical forecast shifts is to wait and make sure it’s not one piece of unexpected bad data that’s thrown things off. If the models continue this trend of turning, tonight’s 11 PM EDT update will move the forecast in a big way… and people in Florida will exhale.