Official Discussion issued by the National Hurricane Center

Don (AL052023) DATA RELEASED: 7/24/2023 9:00:00 AM UTC

Copy of official data

Tropical Storm Don Discussion Number  41
NWS National Hurricane Center Miami FL       AL052023
900 AM GMT Mon Jul 24 2023

Deep convection has evaporated near Don, though it hasn't been free 
of convection long enough to declare it post-tropical yet.  The 
initial wind speed is lowered to 40 kt, in concert with the Dvorak 
estimates that are decreasing as fast as the rules allow.  Don 
should become post-tropical soon and continue to weaken due to 
persistent cold waters and shear.  

The storm is moving east-northeastward at about 16 kt, and that 
general motion is likely to persist until the system dissipates 
in about a day.  All of the global models show Don opening up into 
a trough in 18-24 hours, so the dissipation phase is moved to that 
time.  No other significant changes were made to the 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.


INIT  24/0900Z 47.0N  43.0W   40 KT  45 MPH
12H  24/1800Z 47.9N  39.7W   35 KT  40 MPH...POST-TROPICAL
24H  25/0600Z...DISSIPATED

Forecaster Blake