142  
WTNT41 KNHC 312034  
TCDAT1  
 
POST-TROPICAL CYCLONE OSCAR DISCUSSION NUMBER 20  
NWS NATIONAL HURRICANE CENTER MIAMI FL AL162018  
500 PM AST WED OCT 31 2018  
 
SATELLITE IMAGERY AND SCATTEROMETER DATA INDICATE THAT OSCAR HAS  
BECOME A HURRICANE-FORCE EXTRATROPICAL LOW, AS THE CENTRAL  
CONVECTION HAS ALL BUT DISSIPATED AND FRONTAL-BAND-TYPE CLOUD  
FEATURES HAVE BECOME BETTER DEFINED. THE SCATTEROMETER DATA SHOW  
HURRICANE-FORCE WINDS ABOUT 70 N MI SOUTH OF THE CENTER, AND THAT  
THE OVERALL WIND FIELD HAS EXPANDED CONSIDERABLY SINCE THE PREVIOUS  
OVERPASS. THE CYCLONE IS EXPECTED TO MAINTAIN AN INTENSITY OF 60-65  
KT FOR THE NEXT 48 H, THEN GRADUALLY WEAKEN AS THE BAROCLINIC ENERGY  
WANES, WITH DISSIPATION OCCURRING BETWEEN 96-120 H OVER THE FAR  
NORTHEASTERN ATLANTIC.  
 
THE INITIAL MOTION IS NOW 030/30 KT. OSCAR IS NOW WELL EMBEDDED IN  
THE MID-LATITUDE WESTERLIES, AND FOR THE NEXT 3-4 DAYS IT SHOULD  
MOVE GENERALLY NORTHEASTWARD WITH A GRADUAL DECREASE IN FORWARD  
SPEED.  
 
MUCH OF THE CURRENT FORECAST, ESPECIALLY THE INTENSITY AND THE  
SIZE, IS BASED ON INPUT FROM THE NOAA OCEAN PREDICTION CENTER.  
 
THIS IS THE LAST ADVISORY ON OSCAR FROM THE NATIONAL HURRICANE  
CENTER. ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN HIGH  
SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE, UNDER AWIPS  
HEADER NFDHSFAT1, WMO HEADER FZNT01 KWBC, AND AVAILABLE ON THE WEB  
AT HTTPS://OCEAN.WEATHER.GOV/SHTML/NFDHSFAT1.SHTML.  
 
FORECAST POSITIONS AND MAX WINDS  
 
INIT 31/2100Z 39.3N 49.6W 65 KT 75 MPH...POST-TROP/EXTRATROP  
12H 01/0600Z 42.6N 46.6W 65 KT 75 MPH...POST-TROP/EXTRATROP  
24H 01/1800Z 46.8N 41.4W 65 KT 75 MPH...POST-TROP/EXTRATROP  
36H 02/0600Z 50.7N 35.1W 60 KT 70 MPH...POST-TROP/EXTRATROP  
48H 02/1800Z 54.2N 28.4W 60 KT 70 MPH...POST-TROP/EXTRATROP  
72H 03/1800Z 59.5N 15.0W 55 KT 65 MPH...POST-TROP/EXTRATROP  
96H 04/1800Z 67.0N 2.0W 45 KT 50 MPH...POST-TROP/EXTRATROP  
120H 05/1800Z...DISSIPATED  
 

 
FORECASTER BEVEN  
 
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