WTNT42 KNHC 242040

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.


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