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Post-Tropical Cyclone Bonnie Discussion Number  49
NWS National Hurricane Center Miami FL       EP042022
200 PM PDT Sat Jul 09 2022
 
Bonnie has now been devoid of deep convection for over 12 hours,
which means it has degenerated into a post-tropical low and this
will be the last advisory.  An ASCAT pass around 1800 UTC showed
maximum winds between 35 and 40 kt, so with the assumption of some 
continued weakening, the advisory intensity is 35 kt.  Additional 
gradual weakening is anticipated over the next day or so while the
convection-less low moves quickly westward between 15-18 kt over
waters of 23-24 degrees Celsius and further into a drier, more
stable air mass.  Global model surface fields indicate that
Bonnie's circulation should open up into a trough by Sunday night,
and dissipation is now shown in the forecast at 36 hours.
 
For additional information on the post-tropical low please see High
Seas Forecasts issued by the National Weather Service...under
AWIPS header NFDHSFEPI and WMO header FZPN02 KWBC.
 
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  09/2100Z 19.5N 129.4W   35 KT  40 MPH...POST-TROPICAL
 12H  10/0600Z 19.5N 132.1W   30 KT  35 MPH...POST-TROP/REMNT LOW
 24H  10/1800Z 19.5N 135.2W   30 KT  35 MPH...POST-TROP/REMNT LOW
 36H  11/0600Z...DISSIPATED
 
$$
Forecaster Berg
 
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