#344 Postby srainhoutx » Sat Sep 25, 2010 8:25 am
HPC this morning...
WHILE THE ENS MEANS OF GFS AND ECMWF ARE SIMILAR AND EITHER COULD
BE USED AFTER DAY 5 OVER CONUS THE HPC PREFERENCE IS TOWARDS THE
00Z ECMWF ENS MEAN BASED ON ITS HANDLING OF THE TROPICAL LOW
FORMATION IN THE WRN CARIBBEAN AND ITS SLOWER AND MORE WWD LIFT
NORTHWARD BY THE END OF THE PERIOD. CMC HAS BEEN CONSISTENTLY FAST
WITH ITS EJECTION INTO FL DAYS 4 AND 5 WITH THE 00Z ECMWF PICKING
IT UP BY DAY 5 AND RUNNING IT UP OFF THE ERN SEABOARD DAY 7 SAT.
UKMET HOLDS THE CIRCULATION BACK NEAR YUCATAN THURSDAY NIGHT WITH
GFS OVER CENTRAL CUBA WHERE IT ONLY SLOWLY MOVES BEFORE IT IS
PICKED UP BY LATE SATURDAY AND EJECTED NEWD. BOTH GFS AND ECMWF
ENS MEANS KEEP THE CIRCULATION CENTER IN THE ERN GLFMEX NEAR THE
WRN FL COAST BY DAY 7. WHILE HIGHLY UNCERTAIN THIS IS A BETTER
MATCH TOWARDS THE LAGGED AVERAGE FORECAST LOCATION AND THE
TENDENCY FOR MODELS TO EJECT CARIBBEAN/LOWER GLFMEX SYSTEMS TOO
FAST.
A PATTERN CHANGE FOR ERN CONUS TO COOLER AND QUITE WET WITH THE
CUTOFF LOW EARLY IN THE WEEK AND A LINGERING TROF AND COASTAL
FRONT ESPECIALLY OVER THE SERN SEABOARD LATE WEEK. WELL ABOVE AVG
TEMPS OVER WRN CONUS THIS PERIOD WITH SOME SCATTERED LOCATIONS
ESPECIALY IN THE ROCKIES HAVING NEAR RECORD HIGH TEMPS. A HEAVY
RAIN AND WIND THREAT FOR CUBA AND FLORIDA MID WEEK INTO THE
WEEKEND DEPENDING UPON THE DEVELOPMENT/TRACK AND TIMING OF THE WRN
CARIBBEAN LOW AS IT MOVES SLOWLY NORTHWARD. SEE TPC/HPC
DISCUSSIONS AND POTENTIAL FUTURE ADVISORIES.
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