FXCN31 CWHX 090000 TROPICAL CYCLONE TECHNICAL INFORMATION STATEMENT ISSUED BY THE CANADIAN HURRICANE CENTRE OF ENVIRONMENT CANADA AT 9.00 PM ADT THURSDAY 08 SEPTEMBER 2011. THE NEXT STATEMENT WILL BE ISSUED BY 3.00 AM ADT 1. CURRENT POSITION, STRENGTH, CENTRAL PRESSURE AND MOTION AT 9.00 PM ADT , HURRICANE KATIA WAS LOCATED NEAR LATITUDE 35.5 N AND LONGITUDE 69.7 W , ABOUT 285 NAUTICAL MILES OR 530 KM EAST OF CAPE HATTERAS . MAXIMUM SUSTAINED WINDS ARE ESTIMATED AT 75 KNOTS ( 139 KM/H ) AND CENTRAL PRESSURE AT 973 MB. KATIA IS MOVING NORTH NORTHEAST AT 16 KNOTS ( 30 KM/H ). 2. FORECAST POSITION, CENTRAL PRESSURE AND STRENGTH DATE TIME LAT LON MSLP MAX WIND ADT MB KTS KMH SEP 08 9.00 PM 35.5N 69.7W 973 75 139 SEP 09 3.00 AM 37.0N 68.9W 973 75 139 SEP 09 9.00 AM 38.1N 67.2W 973 75 139 SEP 09 3.00 PM 39.5N 64.2W 971 75 139 SEP 09 9.00 PM 40.6N 60.8W 969 75 139 SEP 10 3.00 AM 41.5N 57.2W 970 70 130 SEP 10 9.00 AM 43.0N 52.5W 973 70 130 POST-TROPICAL SEP 10 3.00 PM 44.6N 47.0W 974 65 120 POST-TROPICAL SEP 10 9.00 PM 46.5N 40.7W 975 65 120 POST-TROPICAL 3. TECHNICAL DISCUSSION A. ANALYSIS KATIA REMAINS VERY WELL ORGANIZED ON SATELLITE IMAGERY. THE STORM IS ALSO MOVING FAIRLY QUICKLY NORTH NORTHEASTWARD NOW. LARGE WAVES AND SWELL ARE RADIATING AWAY FROM THE STORM AND ARE CRASHING ONSHORE IN SOUTHERN NOVA SCOTIA - ABOUT 1000 KM TO THE NORTH-NORTHEAST. B. PROGNOSTIC THE COMPUTER MODELS ARE UNANIMOUS IN TRACKING KATIA SOUTH OF THE MARITIMES MARINE FORECAST DISTRICT TOMORROW AND CROSSING JUST INTO OR ALONG THE EDGE OF THE SOUTHERN GRAND BANKS MARINE DISTRICT EARLY SATURDAY. GALE-FORCE WINDS WILL MOST LIKELY SPREAD ACROSS THE SOUTHERN MARINE FORECAST ZONES WITH STORM-FORCE WINDS CLOSER TO THE TRACK. DYNAMICAL MODELS SHOW KATIA REMAINING AT HURRICANE STRENGTH DURING ITS ENTIRE TRAJECTORY SOUTH OF ATLANTIC CANADA. IN FACT THE GEM REG MODEL ACTUALLY DEEPNS THE CENTRAL PRESSURE A BIT AS IT RACES EAST- NORTHEASTWARD. KATIA WILL LIKELY DERIVE SOME ENERGY FROM THE ZONAL BAROCLINIC GRADIENT TO ITS NORTH. IN TERMS OF THE WIND FIELD, THIS WOULD ENHANCE THE NORTHWESTERLY WIND JET ON THE STORM'S BACKSIDE. C. PREDICTED WIND RADII (NM) TIME GALES STORMS HURRICANE NE SE SW NW NE SE SW NW NE SE SW NW 09/00Z 200 180 170 175 120 100 100 100 60 50 40 70 09/06Z 200 185 180 170 130 105 85 100 65 50 30 60 09/12Z 190 190 190 160 125 110 90 95 65 50 30 60 09/18Z 190 200 200 160 115 115 95 90 60 50 20 50 10/00Z 180 210 200 155 100 115 95 85 60 50 20 40 10/06Z 180 225 200 150 90 120 100 80 60 50 20 40 10/12Z 180 230 200 150 90 125 100 75 55 50 20 30 10/18Z 180 230 200 150 90 125 100 70 50 50 20 30 11/00Z 180 220 200 140 100 120 100 60 50 50 20 30 END/FOGARTY/HATT