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Post-Tropical Cyclone Douglas Discussion Number 37
NWS Central Pacific Hurricane Center Honolulu HI EP082020
500 AM HST Wed Jul 29 2020
A cluster of thunderstorms north of Douglas' center is producing an
impressive amount of lightning this morning, but is not indicative
of system reorganization. While these thunderstorms are indeed
associated with Douglas' deteriorating circulation, they are removed
from the center, and will soon be sheared away by persistent
southerly vertical wind shear. Satellite imagery shows the exposed
low-level circulation center becoming increasingly elongated, while
an earlier ASCAT pass indicated little in the way of westerly flow
in the southern semicircle. Douglas has degenerated into a post-
tropical remnant low (and may already be an open wave) with maximum
winds on the north side estimated to be near 30 kt.
With Douglas' initial motion vector of 275/20 kt, associated
hazards have moved west of the Papahanaumokuakea Marine National
Monument, and the Tropical Storm Warning has been discontinued. A
strong low-level ridge to the north will steer Douglas rapidly
westward, with the remnant low expected to cross the International
Date Line later today. As the remnant low rounds the ridge, it is
expected to gain some latitude over the next 24 hours or so before
dissipating, in line with global model guidance and the previous
forecast.
This is the last advisory issued by the Central Pacific Hurricane
Center on Douglas. 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 29/1500Z 24.7N 175.4W 30 KT 35 MPH...POST-TROPICAL
12H 30/0000Z 25.0N 178.6W 30 KT 35 MPH...POST-TROP/REMNT LOW
24H 30/1200Z 25.9N 177.2E 25 KT 30 MPH...POST-TROP/REMNT LOW
36H 31/0000Z...DISSIPATED
$$
Forecaster Birchard
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