662 
 WTNT42 KNHC 101023
 TCDAT2
  
 HURRICANE KATIA DISCUSSION NUMBER  49...CORRECTED
 NWS NATIONAL HURRICANE CENTER MIAMI FL       AL122011
 500 AM AST SAT SEP 10 2011
  
 CORRECTED STATUS IN TABLE AT 12-HOUR FORECAST TIME
 
 KATIA APPEARS TO BE GRADUALLY LOSING ITS TROPICAL CHARACTERISTICS.
 THE ASSOCIATED CLOUD PATTERN IS BECOMING INCREASINGLY ELONGATED...
 WITH THE LOW-LEVEL CENTER ON THE SOUTHERN EDGE OF THE 
 CONVECTION. THE LATEST SATELLITE CLASSIFICATIONS SUGGEST THAT KATIA
 HAS WEAKENED A LITTLE...AND THAT IS THE BASIS FOR THE SLIGHTLY
 LOWER INITIAL INTENSITY OF 70 KT. STRONG SOUTHWESTERLY SHEAR
 ASSOCIATED WITH A DEEP-LAYER TROUGH AND SEA SURFACE TEMPERATURES
 COLDER THAN 20C...SHOULD CAUSE KATIA TO BECOME EXTRATROPICAL IN
 ABOUT 12 HOURS. HOWEVER...THE CYCLONE IS EXPECTED TO REMAIN QUITE
 STRONG AS AN EXTRATROPICAL SYSTEM WHILE MOVING QUICKLY ACROSS THE
 FAR NORTH ATLANTIC....APPROACHING THE BRITISH ISLES AND NORTHERN
 EUROPE IN A COUPLE OF DAYS.
   
 THE HURRICANE IS EMBEDDED IN THE STRONG MID-LATITUDE WESTERLIES...
 AND THE LATEST INITIAL MOTION ESTIMATE IS 060/38. THE CYCLONE IS
 EXPECTED TO ACCELERATE DURING THE NEXT 12 TO 24 HOURS WITHIN THE
 STRONG FLOW TO THE EAST OF A HIGH LATITUDE DEEP-LAYER TROUGH. THE
 FORECAST TRACK IS SIMILAR TO THE PREVIOUS ONE AND CLOSE TO THE
 GUIDANCE PROVIDED BY THE OCEAN PREDICTION CENTER.
  
 INTERESTS IN AND AROUND THE BRITISH ISLES AND NORTHERN EUROPE SHOULD
 MONITOR PRODUCTS ISSUED BY THE UKMET OFFICE AT
 WWW.METOFFICE.GOV.UK/WEATHER
  
 NO 96-HOUR FORECAST POINT HAS BEEN PROVIDED DUE TO SOFTWARE
 ISSUES WHEN SYSTEMS MOVE EAST OF ZERO DEGREES LONGITUDE. THE 34- AND
 50-KT WIND RADII WERE EXPANDED OUTWARD OVER THE WESTERN SEMICIRCLE
 BASED ON A 0144 UTC ASCAT PASS.
  
 FORECAST POSITIONS AND MAX WINDS
  
 INIT  10/0900Z 43.3N  53.4W   70 KT  80 MPH
  12H  10/1800Z 46.0N  44.7W   65 KT  75 MPH...POST-TROP/EXTRATROP
  24H  11/0600Z 50.2N  32.2W   65 KT  75 MPH...POST-TROP/EXTRATROP
  36H  11/1800Z 53.9N  21.6W   65 KT  75 MPH...POST-TROP/EXTRATROP
  48H  12/0600Z 57.3N  13.7W   60 KT  70 MPH...POST-TROP/EXTRATROP
  72H  13/0600Z 61.3N   1.3W   45 KT  50 MPH...POST-TROP/EXTRATROP
  96H  14/0600Z...EAST OF ZERO DEGREES LONGITUDE
  
 $$
 FORECASTER CANGIALOSI