Very interesting section of the discussion...still very concerned down here in Ft. lauderdale
"The Gulfstream-IV jet and an afres c-130 have been releasing dropsondes around the periphery of Frances. The sonde data has produced some interesting and disturbing results. The height data for the various pressure levels...compared to 18z surrounding upper-air data...appear to be at least 20 meters too low. However...the wind data clearly indicate a mid-tropospheric high pressure center near 30n 75w...or about 500 nmi northwest of Frances with a ridge axis extending west-southwestward across North Florida and into the northeast Gulf of Mexico. In the short term... this would suggest that Frances should continue moving at 295 or even 290 degrees motion for the next 24 hours or so. Also...00z upper-air data indicate that the 18z NOGAPS and 12z UKMET models have verified the 00z 500 mb ridge and heights the best...while the 18z GFS and GFDL models were much too weak...at least 20 meters too low...with the strength of the ridge. Since the 00z model runs will have the new GPS dropsonde data included in those runs for the 06z advisory...no significant change is being made to the previous forecast track. However...with high pressure located to the northwest of Frances...I would not be surprised to the 00z model tracks shift a little more westward."
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