San Juan, PR Morning AFD excerpt could explain the reason for the track anomalies.
.PREV DISCUSSION... /ISSUED 613 AM AST MON AUG 30 2010/
SYNOPSIS...HURRICANE EARL LOCATED OVER THE NORTHERN LEEWARD ISLANDS WILL CONTINUE TO MOVE WEST AND ACROSS THE LOCAL FORECAST AREA. THEN ON TUESDAY NIGHT HIGH PRESSURE IN THE WEST CENTRAL ATLANTIC WILL RIDGE TO THE SOUTHWEST AND INTO THE NORTHEAST CARIBBEAN...AND CONTINUE UNTIL THURSDAY EVENING. A LOW PRESSURE SYSTEM WILL MOVE INTO THE EASTERN CARIBBEAN THURSDAY THROUGH SATURDAY.