The reason for the slight westward shift is the upper air data coming out of Bermuda today and again tonight. At 23/00Z the 500 mb decameter height came in at 594 which is a 10 meter increase from 22/12Z. This is an indicator that the Bermuda subtropical upper ridge remains strong. Irene's outflow is also a contributing factor as her large size and outflow entering the westerlies will contribute to aid in keeping the ridge strong.
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