TROPICAL DISCUSSION - INTERNATIONAL DESKS NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD 238 PM EDT TUE AUG 02 2011 (edited~danielw)
A FEATURE OF INTEREST IS A DIGGING MID/UPPER LEVEL TROUGH THAT EXTENDS SOUTH ACROSS THE WESTERN ATLANTIC TO THE FLORIDA PENINSULA. THIS TROUGH IS TO ENTER THE NORTHWEST BAHAMAS EARLY IN THE CYCLE...AND THROUGH 36-42 HRS IT WILL REACH THE SOUTHEAST BAHAMAS/TURKS AND CAICOS. BY 54-60 HRS...AS SUBEQUATORIAL RIDGE STRENGTHENS TO THE SOUTH AND EAST OF THIS AXIS...THE TROUGH IS FORECAST TO SPLIT IN TWO...LEAVING BEHIND A TUTT LOW NEAR 27N 72W. THERE IS SOME DIVERGENCE AMONG THE GLOBAL MODELS ON INTENSITY OF THIS FEATURE...WITH GFS SHOWING A STRONGER LOW/TROUGH PATTERN THAN MOST OTHER MODELS. AS THE TROUGH AMPLIFIES...THIS IS TO THEN ENHANCE SEA BREEZE CONVERGENCE ACROSS CUBA....WHERE IT IS TO FAVOR RAINFALL AMOUNTS OF 05-10MM/DAY AND MAXIMA OF 15-25MM/DAY. THROUGH 48 HRS THIS WILL INCREASE TO 10-15MM/DAY AND MAXIMA OF 20-35MM/DAY. OVER THE NORTHWEST BAHAMAS EXPECT SOME ENHANCEMENT THROUGH 42-48 HRS... TO FAVOR RAINFALL AMOUNTS OF 05-10MM/DAY AND MAXIMA OF 15-20MM/DAY.
THE SUBEQUATORIAL RIDGE CONTINUES TO STRENGTHEN ACROSS THE TROPICAL ATLANTIC/EASTERN CARIBBEAN...MEANWHILE SUSTAINING A DIVERGENT PATTERN ALOFT THAT IS VENTING DEEP CONVECTION IN ASSOCIATION WITH TROPICAL STORM EMILY. THE RIDGE PATTERN WILL GRADUALLY STRENGTHEN THROUGH DAY 03...WHEN IT IS TO CENTER ON A CLOSED HIGH OVER THE DOMINICAN REPUBLIC. THE NHC FORECAST EMILY TO TRACK SOUTH OF PUERTO RICO TOWARDS THE DOMINICAN REPUBLIC THROUGH WEDNESDAY AFTERNOON...TO MAKE LANDFALL JUST NORTH OF PENINSULA DE BARAHONA. THROUGH THURSDAY MORNING IT WILL THEN CONTINUE ACROSS HAITI TOWARDS EASTERN CUBA. WEAKENING OF THIS SYSTEM IS EXPECTED DUE TO HIGH TERRAIN OVER CENTRAL HISPANIOLA...WITH GRADUAL INTENSIFICATION TO FOLLOW AS IT MOVES NORTH OF CUBA/THE BAHAMAS. THE BROAD CIRCULATION SUSTAINS A LARGE AREA OF CONVECTION.
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