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Post-Tropical Cyclone Greg Discussion Number  38
NWS Central Pacific Hurricane Center Honolulu HI   EP072017
1100 AM HST Wed Jul 26 2017
 
Intermittent deep convection is sputtering over what remains of a
messy low level center, and Greg is being declared a remnant low in
this advisory. Scatterometer data last evening and the latest
subjective intensity estimate from PHFO suggest there is probably 
still a small area of 25 kt winds on the north side of the
circulation, so that is being used for the advisory intensity. The
system is under strong southwesterly shear that is forecast to
increase over the next 36 hours, and relatively cool sea surface
temperatures of 25C. Thus, the remnant low is expected to open up to
a trough in the next day or so. In the meantime, the increasingly
shallow remnant of Greg should continue to track on a general
westward heading, being steered by the low level trade wind flow.
 
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  26/2100Z 18.4N 142.0W   25 KT  30 MPH...POST-TROPICAL
 12H  27/0600Z 18.5N 143.4W   25 KT  30 MPH...POST-TROP/REMNT LOW
 24H  27/1800Z 18.3N 145.2W   20 KT  25 MPH...POST-TROP/REMNT LOW
 36H  28/0600Z 18.1N 146.9W   20 KT  25 MPH...POST-TROP/REMNT LOW
 48H  28/1800Z...DISSIPATED
 
$$
Forecaster R Ballard
 
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