684
WTPZ43 KNHC 220236
TCDEP3
TROPICAL DEPRESSION THIRTEEN-E DISCUSSION NUMBER 1
NWS NATIONAL HURRICANE CENTER MIAMI FL EP132012
800 PM PDT FRI SEP 21 2012
THE WELL-DEFINED LOW PRESSURE SYSTEM LOCATED ABOUT 375 N MI
SOUTH-SOUTHWEST OF MANZANILLO MEXICO HAS ACQUIRED SUFFICIENT
CONVECTIVE ORGANIZATION TO BE CLASSIFIED AS A TROPICAL DEPRESSION.
THE INITIAL INTENSITY IS SET AT 30 KT BASED ON A BLEND OF DVORAK
CLASSIFICATIONS FROM TAFB AND SAB. THE DEPRESSION SHOULD HAVE A FEW
DAYS TO GAIN STRENGTH AS IT IS EXPECTED TO REMAIN OVER 28-29C
WATERS AND STAY IN AN FAIRLY LOW WIND SHEAR ENVIRONMENT. IN
FACT...THE SHIPS MODEL RI INDEX INDICATES ABOUT A 40 PERCENT CHANCE
OF 30-KT STRENGTHENING DURING THE NEXT 24 HOURS. AFTER A FEW
DAYS...THE GLOBAL MODELS SHOW AN INCREASE IN WESTERLY SHEAR IN
ASSOCIATION WITH AN UPPER-LEVEL TROUGH OFF THE CALIFORNIA COAST.
THESE LESS FAVORABLE ATMOSPHERIC CONDITIONS COMBINED WITH COOLER
WATERS SHOULD CAUSE A WEAKENING TREND.
THE DEPRESSION IS MOVING WESTWARD AT ABOUT 10 KT TO THE SOUTH OF A
MID-LEVEL RIDGE LOCATED OVER THE SOUTHWESTERN UNITED STATES. THIS
RIDGE IS EXPECTED TO WEAKEN AND BE REPLACED BY A SHORTWAVE TROUGH
IN A FEW DAYS...CAUSING THE CYCLONE TO SLOW DOWN AND TURN
WEST-NORTHWESTWARD. THE NHC FORECAST LIES BETWEEN THE GFS AND ECMWF
MODELS THROUGHOUT THE ENTIRE PERIOD. BASED ON THE CURRENT
MODEL GUIDANCE...THIS SYSTEM IS NOT EXPECTED TO BE A THREAT TO LAND.
FORECAST POSITIONS AND MAX WINDS
INIT 22/0300Z 13.7N 107.5W 30 KT 35 MPH
12H 22/1200Z 13.9N 108.8W 35 KT 40 MPH
24H 23/0000Z 14.3N 110.4W 45 KT 50 MPH
36H 23/1200Z 14.9N 111.8W 55 KT 65 MPH
48H 24/0000Z 15.7N 113.1W 60 KT 70 MPH
72H 25/0000Z 17.5N 116.0W 75 KT 85 MPH
96H 26/0000Z 18.5N 118.0W 70 KT 80 MPH
120H 27/0000Z 19.5N 120.0W 65 KT 75 MPH
$$
FORECASTER CANGIALOSI
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