000
WTNT42 KNHC 111437
TCDAT2
 
Post-Tropical Cyclone Larry Discussion Number  44
NWS National Hurricane Center Miami FL       AL122021
1100 AM AST Sat Sep 11 2021
 
Satellite images indicate that Larry has completed its transition to 
a post-tropical cyclone with most of the deep convection dissipating 
near the low-level center and frontal features developing.  In 
addition, the low- and mid-level centers are now well separated, 
and the cyclone appears a little weaker.  The initial intensity is 
estimated to be 60 kt.  The post-tropical system is very large and 
gale-force winds and high seas extend far from the center. It is 
interesting to note that up to just several hours ago Larry had 
maintained an inner core and a fairly tropical appearance despite 
being at very high latitudes and over quite cold water.  Larry is 
racing northeastward, with the initial motion estimated to be 030/42 
kt.  The storm is expected to merge with another large extratropical 
low tonight or early Sunday.
 
This is the last NHC advisory on Larry.  For more information on
this system, see 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. Large swells generated by Post-Tropical Cyclone Larry will
continue to affect portions of the the east coast of the United
States and Atlantic Canada through tonight. These swells will cause
life-threatening surf and rip current conditions, and beachgoers and
other interests along these coasts are urged to follow the guidance
of lifeguards and local officials.
 
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  11/1500Z 54.0N  48.2W   60 KT  70 MPH...POST-TROPICAL
 12H  12/0000Z 57.8N  44.9W   55 KT  65 MPH...POST-TROP/EXTRATROP
 24H  12/1200Z...DISSIPATED
 
$$
Forecaster Cangialosi