MIDDLE/UPPER LEVEL SYNOPTIC FEATURES...
GULF OF MEXICO AND WESTERN ATLANTIC...
ALL EYES ARE ON THE MID/UPPER LEVEL FEATURES CURRENTLY OVER THE
GLFMEX IN THE ANTICIPATION ON THE TRACK OF HURRICANE ISABEL. A
HIGH AMPLITUDE RIDGE IS CURRENTLY ANCHORED OVER THE GULF...AND
IS SANDWICHED BETWEEN TWO SEPARATE UPPER LEVEL TROUGHS/LOWS. ONE
LOW IS CENTERED OFF THE COAST OF SOUTH CAROLINA WITH A TROUGH
AXIS EXTENDING NW TOWARDS THE APPALACHIANS. A LARGE AREA OF DRY
AIR IS ASSOCIATED WITH THIS FEATURE AND COVERS THE AREA N OF 26N
WEST OF 74W...INCLUDING MUCH OF THE SOUTHEAST UNITED STATES. THE
SECOND UPPER LEVEL LOW IS MOVING SLOWLY EWD ACROSS N TEXAS AND
IS ALSO ASSOCIATED WITH A LARGE AREA OF DRY AIR...GENERALLY WEST
OF 93W. IN BETWEEN...A PLUME OF UPPER LEVEL MOISTURE IS FLOWING
FROM CNTRL MEXICO NWD INTO THE OHIO VALLEY ON THE WEST SIDE OF
THE RIDGE. DESPITE THE RIDGE...HOWEVER...A WEAK TROUGH IS
CENTERED OVER THE CNTRL GULF ALONG 22N89W 27N90W AND IS MOVING
VERY LITTLE SINCE IT IS EMBEDDED WITHIN THE FLOW ASSOCIATED WITH
THE RIDGE. ALL THESE FEATURES MOVE VERY LITTLE OVER THE NEXT 48
HRS AND EACH OF THE UPPER LEVEL LOWS IS ACTUALLY FORECAST TO
BECOME ABSORBED INTO A MUCH LARGER TROUGH AS IT SWINGS EWD
ACROSS THE CNTRL U.S. THROUGH THE WEEKEND. ISABEL'S TRACK WILL
LARGELY DEPEND ON HOW LONG THE MID/UPPER LOW STAYS OFF THE
SOUTHEAST U.S. COAST AND ULTIMATELY HOW THIS WILL AFFECT THE
STRENGTH OF THE MID-LEVEL SUBTROPICAL RIDGE
This is a good reading from the 8:05am Discussion
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