[Tropical] Tropical Cyclone Discussion

[EMWIN Server]

WTNT45 KNHC 241456
TCDAT5

Post-Tropical Cyclone Don Discussion Number  42
NWS National Hurricane Center Miami FL       AL052023
300 PM GMT Mon Jul 24 2023

Satellite imagery shows that Don lacks sufficient deep convection to
classify the system as a tropical cyclone, and it is now post
tropical.  The initial wind speed remains at 40 kt for this
advisory, based on a recent ASCAT-B scatterometer pass.  Don should
slowly weaken over the next day or so while moving over cold waters
and within high vertical wind shear.

The system is moving east-northeastward at about 17 kt, and this
general motion will likely to continue until Don dissipates in
about a day.  Most of the global guidance has post-tropical Don
opening up into a trough and becoming absorbed by a larger
extratropical low over the north Atlantic tomorrow. Very few changes
were made to the previous NHC forecast.

Don has been a very long-lasting tropical cyclone (including
subtropical stages) for the month of July.  Preliminary data
indicate that the storm is the 5th longest-lasting system on record
for the month, just behind Emily of 2005.

This is the last advisory on Don.  Additional information on this
system can be found in High Seas Forecasts issued by the National
Weather Service...under AWIPS header NFDHSFAT1 and WMO header
FZNT01 KWBC, and online at
ocean.weather.gov/shtml/NFDHSDAT1.php


FORECAST POSITIONS AND MAX WINDS

INIT  24/1500Z 47.6N  40.7W   40 KT  45 MPH...POST-TROPICAL
 12H  25/0000Z 48.1N  36.9W   35 KT  40 MPH...POST-TROPICAL
 24H  25/1200Z...DISSIPATED

$$
Forecaster Kelly/Pasch
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