Hurricane Ana Passing South of Oahu

Although Hurricane Ana is bringing rain to some of the Hawaiian Islands, the core of the storm is passing south of Oahu.  At 11:00 p.m. EDT on Saturday the center of Hurricane Ana was located at latitude 19.9°N and longitude 159.2°W which put it about 130 miles southwest of Honolulu and about 145 miles south of Lihue.  Ana was moving toward the northwest at 8 m.p.h.  The maximum sustained wind speed was 80 m.p.h. and the minimum surface pressure was 987 mb.  A Tropical Storm Warning has been issued for Kauai County including the islands of Kauai and Niihau.  A Tropical Storm Watch remains in effect for Oahu.

A ridge of high pressure that was steering Ana more toward the west is weakening and the hurricane is moving more toward the northwest.  As the steering winds have weakened, the forward speed of Ana has decreased.  Eventually, another ridge of high pressure is expected to build north of Ana and make it turn more toward the west-northwest again.  The Tropical Storm Warning for Kauai was issued as a precaution in case the turn toward the west-northwest is delayed.

An upper level trough northwest of Ana is generating wind shear over the top of the hurricane.  However, the structure has remained relatively intact and a reconnaissance plane found winds to 80 m.p.h. in the northwestern portion of the eyewall.  The intensity of Ana may fluctuate during the next few days as shear increases and decreases.