TD18 (2145)/Past
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Subtropical Storm Cassandra
Advisory 1
4518 TCWC HPCLC SUBTROPICAL STORM CASSANDRA (4518) ADVISORY 001 LIVERPOOL ENGLAND MET SERVICE HURRICANE PREDICTION CENTRE OREAN, SER, LIVERPOOL ENGLAND HEADQUARTERS 1 AM PAX... 3 AM HPT... 3:30 AM LOCAL TIME JUL 30 2145 TROPICAL DISTURBANCE NEAR OLD BORDER BETWEEN LIVERPOOL ENGLAND/UPPER BISWALD DETERMINED TO BE SUBTROPICAL IN NATURE... ADVISORIES ARE INITIATED ON SUBTROPICAL STORM CASSANDRA. INITIAL INTENSITY OF 45 KT IS BASED ON 40-KT WINDS FROM A QUIKSCAT AT 0031H... AND A SHIP REPORT OF 49-KT WINDS ABOUT 140 NM NNE OF THE SYSTEM... ALTHOUGH QUALITY CONTROLS SUGGEST THIS VALUE IS MORE LIKELY TO BE NEAR 46 KT. SHIP... FRX21... ALSO REPORTED PRESSURE READING OF 997 HPA. GIVEN THE SHIP'S POSITION RELATIVE TO THE CENTRE OF THE STORM VERSUS QUALITY CONTROL... IT WAS DETERMINED THAT 997 HPA WAS A FAIR VALUE AS AN ESTIMATION OF THE STORM'S MINIMUM CENTRAL PRESSURE. A TROPICAL STORM WARNING IS NOW IN EFFECT FOR THE COAST OF LIVERPOOL ENGLAND FROM JUST SOUTH OF THE OLD BORDER WITH UPPER BISWALD TO THE POINT 41.5 N 21.7 E...ABOUT 200 KM NE OF THE LIVERPOOL ENGLAND MARINE/NAVAL BASE. A TROPICAL STORM WATCH IS FURTHER IN EFFECT NORTHWARD TO THE POINT 42.6 N 22.4 E. AT 3 AM HPT... THE CENTRE OF SUBTROPICAL STORM CASSANDRA WAS LOCATED NEAR LATITUDE 40.3 NORTH LONGITUDE 21.5 EAST... OR ABOUT 260 KM... 160 MILES... SOUTH-SOUTHEAST OF THE LIVERPOOL ENGLAND MARINE AND NAVAL BASE. THE MAXIMUM SUSTAINED WINDS ARE NEAR 85 KM/H... 50 MPH... AND MINIMUM CENTRAL PRESSURE IS ESTIMATED TO BE 997 HPA. THE SYSTEM IS MOVING TO THE NORTHEAST AT NEAR 37 KM/H... 23 MPH. STORM-FORCE WINDS EXTEND OUTWARD UP TO 285 KM... 180 MILES... FROM THE CENTRE. HEAVY RAINS AND CHOPPY SEAS ARE TO BE EXPECTED TO THE EAST OF THE SYSTEM... WITH LIGHTER RAINS ON THE WEST. THERE IS NO MAJOR SYNOPTIC SITUATION TO TALK ABOUT... A LOW NEAR LOX LAND ISLAND DISSIPATING WILL NOT AFFECT SYSTEM. STATIONARY FRONT EXTENDING FROM GULP MOUNTAINS SOUTHWARD TO ABOUT 45 NORTH WILL HALT THIS SYSTEM IN ABOUT 48 HOURS... AND ACCORDINGLY IT IS REDUCED TO A DISSIPATING TROPICAL DEPRESSION AT THAT STAGE. OFFICIAL FORECAST INITIAL TIME IS 30/0300H... ALL TIMES HPT INITIAL... 40.3 N 21.5 E... 45 KT 30/0900H... 41.0 N 22.0 E... 65 KT... STILL SUBTROPICAL 30/1500H... 41.5 N 23.6 E... 70 KT 31/0300H... 41.9 N 25.1 E... 65 KT 31/1500H... 42.1 N 26.1 E... 35 KT 01/0300H... 43.2 N 26.7 E... 25 KT...DISSIPATING 01/1500H...DISSIPATED REPEATING THE 3 AM HPT POSITION... 40.3 N 21.5 E. MAXIMUM SUSTAINED WINDS 85 KM/H... MINIMUM CENTRAL PRESSURE 997 HPA. SYSTEM MOVING NE AT 37 KM/H. THE NEXT ADVISORY WILL BE RELEASED AT 9 AM HPT. FORECASTER RINDLI