903  
WTNT42 KNHC 242040  
TCDAT2  
 
POST-TROPICAL CYCLONE FIONA DISCUSSION NUMBER 42  
NWS NATIONAL HURRICANE CENTER MIAMI FL AL072022  
500 PM AST SAT SEP 24 2022  
 
FIONA REMAINS A LARGE AND POTENT EXTRATROPICAL LOW PRESSURE SYSTEM.  
EVEN THOUGH THE MAXIMUM WINDS HAVE DECREASED JUST BELOW  
HURRICANE-FORCE, ASCAT DATA AND SURFACE OBSERVATIONS SHOW THAT  
FIONA HAS A VERY LARGE WIND FIELD. THE INITIAL WIND SPEED IS  
ESTIMATED TO BE 60 KT.  
 
FIONA HAS SLOWED DOWN SIGNIFICANTLY, AND THE SYSTEM IS NOW MOVING  
NORTHEASTWARD AT 7 KT. A FASTER NORTH TO NORTH-NORTHEAST MOTION IS  
EXPECTED, TAKING THE CENTER OF THE SYSTEM ACROSS LABRADOR TONIGHT  
AND EARLY SUNDAY. THE NHC TRACK FORECAST IS SIMILAR TO THE  
PREVIOUS ONE.  
 
SINCE THE TROPICAL WARNINGS HAVE BEEN DISCONTINUED FOR ATLANTIC  
CANADA, THIS IS THE LAST NHC ADVISORY ON FIONA. FOR INFORMATION ON  
THIS SYSTEM, SEE FORECASTS ISSUED BY ENVIRONMENT CANADA AT  
HTTPS://WEATHER.GC.CA/. ADDITIONAL INFORMATION CAN BE FOUND IN  
HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE, UNDER  
AWIPS HEADER NFDHSFAT1, WMO HEADER FZNT01 KWBC, AND ONLINE  
AT OCEAN.WEATHER.GOV/SHTML/NFDHSFAT1.PHP  
 
 
KEY MESSAGES:  
 
1. FIONA IS FORECAST TO CONTINUE TO AFFECT PORTIONS OF ATLANTIC  
CANADA THROUGH EARLY SUNDAY, AND SIGNIFICANT IMPACTS FROM HIGH  
WINDS, STORM SURGE, AND HEAVY RAINFALL ARE EXPECTED.  
 
2. HEAVY RAINS FROM FIONA ARE EXPECTED TO CONTINUE TO IMPACT  
PORTIONS OF ATLANTIC CANADA INTO SUNDAY. THIS RAINFALL IS EXPECTED  
TO PRODUCE FLOODING, SOME OF WHICH COULD BE SIGNIFICANT.  
 
3. LARGE SWELLS GENERATED BY FIONA ARE EXPECTED TO CAUSE  
LIFE-THREATENING SURF AND RIP CURRENT CONDITIONS ALONG THE COAST OF  
THE NORTHEAST UNITED STATES, BERMUDA, AND ATLANTIC CANADA DURING  
THE NEXT COUPLE OF DAYS.  
 
 
FORECAST POSITIONS AND MAX WINDS  
 
INIT 24/2100Z 48.4N 60.5W 60 KT 70 MPH...POST-TROP/EXTRATROP  
12H 25/0600Z 50.6N 59.3W 50 KT 60 MPH...POST-TROP/EXTRATROP  
24H 25/1800Z 54.9N 58.4W 40 KT 45 MPH...POST-TROP/EXTRATROP  
36H 26/0600Z 58.4N 58.6W 35 KT 40 MPH...POST-TROP/EXTRATROP  
48H 26/1800Z 60.7N 57.7W 35 KT 40 MPH...POST-TROP/EXTRATROP  
60H 27/0600Z 63.1N 56.1W 35 KT 40 MPH...POST-TROP/EXTRATROP  
72H 27/1800Z...DISSIPATED  
 

 
FORECASTER CANGIALOSI  
 
 
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