FXCN31 CWHX 101200
TROPICAL CYCLONE TECHNICAL INFORMATION STATEMENT ISSUED BY THE 
CANADIAN HURRICANE CENTRE OF ENVIRONMENT CANADA AT 8.19 AM ADT 
SATURDAY 10 SEPTEMBER 2011.

THE NEXT STATEMENT WILL BE ISSUED BY 3.00 PM ADT

1. CURRENT POSITION, STRENGTH, CENTRAL PRESSURE AND MOTION

AT 9.00 AM ADT , POST-TROPICAL STORM KATIA WAS LOCATED NEAR
LATITUDE 43.5 N AND LONGITUDE 50.0 W , ABOUT 230 NAUTICAL MILES
OR 425 KM SOUTHEAST OF CAPE RACE . MAXIMUM SUSTAINED WINDS ARE 
ESTIMATED AT 70 KNOTS ( 130 KM/H ) AND CENTRAL PRESSURE AT 955
MB. KATIA IS MOVING EAST NORTHEAST AT 46 KNOTS ( 85 KM/H ).

2. FORECAST POSITION, CENTRAL PRESSURE AND STRENGTH

DATE     TIME     LAT    LON   MSLP  MAX WIND
          ADT                    MB  KTS  KMH
SEP 10  9.00 AM  43.5N  50.0W   955   70  130 POST-TROPICAL
SEP 10  3.00 PM  45.2N  44.4W   957   65  120 POST-TROPICAL
SEP 10  9.00 PM  47.3N  37.2W   957   65  120 POST-TROPICAL

3. TECHNICAL DISCUSSION

A. ANALYSIS
SATELLITE IMAGERY IS FINALLY SHOWING SOME OF THE EFFECTS OF COOLER 
WATER TEMPERATURES AND INCREASED SHEAR ON KATIA.  KATIA HAS NOW 
BECOME  EMBEDDED IN THE WESTERLY CIRCULATION AND THE INCREASED SHEAR 
ENVIRONMENT WILL CONTINUE TO ACCELERATE THE STORM DURING THE NEXT
6 HOURS. KATIA'S TRANSITION TO POST-TROPICAL STATUS IS NOW COMPLETED. 
AT 11 UTC BUOY 44140 INDICATED A PRESSURE MEASURMENT OF 957 MB
AS KATIA PASSED NORTH OF IT.  THIS COMBINED WITH GUSTS TO NEAR
STORM FORCE CAUSED US TO REDUCED THE MINIMAL CENTRAL PRESSURE TO
955 MB.

B. PROGNOSTIC
COMPUTER GUIDANCE IS UNANIMOUS IN TRACKING KATIA ACROSS THE
SOUTHERN EDGE OF THE GRAND BANKS THIS MORNING THEN ACCELERATING 
EASTWARD THEREAFTER.  KATIA WILL BE WELL EAST OF CANADIAN WATERS BY 
LATE THIS AFTERNOON.  DESPITE ITS TRANSITION TO POST-TROPICAL
STATUS, DYNAMICAL MODELS SHOW KATIA WILL NOT LOSE MUCH STRENGTH AS IT
HEADS INTO THE NORTH ATLANTIC.  THE GEM-REGIONAL MODEL CONTINUES TO
SHOW CENTRAL PRESSURES IN THE 960 MB RANGE AND A
LARGE AND VERY STRONG WIND FIELD ALONG WITH IT AFTER IT LEAVES 
CANADIAN WATERS.  KATIA WILL REMAIN A LARGE AND DANGEROUS 
POST-TROPICAL STORM AS IT CROSSES THE NORTH ATLANTIC AND WILL LIKELY 
HAVE SOME IMPACT ON THE BRITISH ISLES WITHIN 72 HOURS OR SO.

C. PREDICTED WIND RADII (NM)

TIME          GALES           STORMS            HURRICANE
         NE  SE  SW  NW    NE  SE  SW  NW    NE  SE  SW  NW
10/12Z  200 275 250 160   100 130 130  80    50  80  50  40
10/18Z  220 300 300 170   100 140 140  80    40  50  40  40
11/00Z  240 325 300 200   110 180 180 100    40  50  40  40

END/BORGEL/MERCER/COUTURIER