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Post-Tropical Cyclone Boris Discussion Number 15
NWS Central Pacific Hurricane Center Honolulu HI EP032020
500 PM HST Sat Jun 27 2020
The low-level circulation center of Boris has been exposed through
most of the day. There have been only two, brief flare ups of deep
convection near the center during the past 24 hours with another
one starting now. The system is also surrounded by dry air aloft as
southeasterly vertical wind shear persists, and JTWC, PHFO, and SAB
all deemed the system too weak to classify this afternoon. Thus,
Boris will be designated as a post-tropical remnant low with an
intensity of 25 kt. Additional bursts of convection can be expected
as the system slowly spins down over the next couple of days, even
as vertical wind shear relaxes on Sunday.
The center of Boris is moving toward the west-southwest (255/07 kt)
under the influence of a deep ridge to the north. This general
motion, along with a slight increase in forward speed, is expected
to continue over the next couple of days until dissipation. The
track forecast is essentially an update from the last advisory and
remains within a tightly clustered guidance envelope.
This is the last advisory issued by the Central Pacific Hurricane
Center on Boris. Additional information on this system can be found
in the High Seas Forecasts issued by the National Weather Service
in Honolulu under AWIPS header HFOHSFNP and WMO header FZPN40 PHFO.
FORECAST POSITIONS AND MAX WINDS
INIT 28/0300Z 12.1N 142.0W 25 KT 30 MPH...POST-TROP/REMNT LOW
12H 28/1200Z 11.8N 143.3W 25 KT 30 MPH...POST-TROP/REMNT LOW
24H 29/0000Z 11.2N 145.1W 25 KT 30 MPH...POST-TROP/REMNT LOW
36H 29/1200Z 10.5N 147.1W 20 KT 25 MPH...POST-TROP/REMNT LOW
48H 30/0000Z...DISSIPATED
$$
Forecaster Wroe
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