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Post-Tropical Cyclone Fiona Forecast Discussion (Text)


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000
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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Page last modified: Saturday, 24-Sep-2022 20:41:22 UTC