Hurricane Jimena
August 31 - September 1, 2003
Impacts in Hawaii
Andy Nash (andy.nash@noaa.gov)
Overview:
Jimena developed on August 28 about 1700
miles east-southeast of Hawaii and developed quickly. On August 30, it
reached it's peak strength as a hurricane with sustained winds slightly
over 100 mph. Jimena moved steadily westward around 17 mph on a course
that would take the center about 50 miles south of the Big Island. On August
31, with Jimena about 300 miles east-southeast of the Big Island, the storm
began to encounter stronger winds in the upper atmosphere that began to
weaken and shear it apart. During the early morning hours of September
1, a rapidly weakening Jimena started moving in a southwest direction as
it was now being pushed along by the low level tradewind flow from the
northeast. Air Force Reserve aircraft reconnaissance could not find any
winds above hurricane strength, and so Jimena was downgraded to a Tropical
Storm. Jimena made it's closest approach to the Big Island around
sunrise, with it located about 110 miles south of South Point. By
that afternoon, much of the convection was gone and Jimena was now just
a tropical depression as it continued to move southwest and away from the
islands.
Jimena's Track {click for full image}
Impacts:
High Surf:
6 to 12 foot surf was reported along the coast
of the Kau (southeast) district of the Big Island. 11 foot waves
were also reported along the coast just north of Hilo.
Heavy Rainfall:
Rainfall amounts of 6 to 10 inches, with higher
isolated amounts, occurred across the windward sections of the Big Island.
Very little rainfall fell across the remainder of the state. No significant
flooding problems occurred, although the Wailuku River had significant
rises but remained within it's banks.
Rainfall Map{click for full image}
High Winds:
Aircraft reconnaissance showed that the strongest
winds (over 50 mph) remained within 50 miles of the center of Jimena, with
Tropical Storm force (over 35 mph) winds extending only about 100 miles
from the center. However, the increased pressure gradient between
Jimena and the subtropical high pressure well north of the islands did
act to increase the winds across the state. The complex topography of the
islands also led to many areas seeing strong wind gusts as the accelerated
trade winds flowed around and over the islands. The highest wind gust measured
in the state was actually from the small island of Kahoolawe with an automated
weather sensor reporting a gust to 58 mph. This is a normally windy spot,
as it is affected by strong winds being funneled around Mount Haleakala
on Maui. Highest wind gusts on the Big Island were 53 mph at South
Point and at an automated weather station in the saddle between Mauna Loa
and Mauna Kea.
Wind Gusts on the Big Island{click for full image}
Wind Gusts for Maui County{click for full image}
Wind Gusts for Other Locations
Honolulu, Oahu | 36 mph |
Lihue, Kauai | 22 mph |
Buoy 4 (SW of the Big Island) | 31 mph |
Buoy 2 (SE of the Big Island) | 45 mph |
Radar Images:
This was only the second time that the
center of a tropical storm or hurricane has been close enough to be detected
by radar since the 4 doppler radars were installed across the state in
the early to mid 90s. The first time was in 1999 with Hurricane Dora (radar,
report),
however Jimena came much closer so that even wind velocity information
could be detected by the radar. At the time Jimena was closest to the range
of the 88D doppler radar in South Hawaii, it was beginning to rapidly deteroriate
from a hurricane to tropical storm. Radar imagery confirmed the ragged
structure of Jimena's center and associated rainbands, and lack of intense
convection completely encircling the center. All are signs of a weakening
system.
Note: in the following images, the circle around
the island represents the 120 mile range mark from the radar site. For
the reflectivity, the greens are generally light rain, yellows are moderate
rain and the oranges and reds represent the heavy rainfall. For the velocity,
the green and blue colors represent winds moving toward the radar,
with blue representing the highest speeds of 40+ mph. The oranges
and reds represent winds moving away from the radar, with dark red
representing the highest speeds of 40+ mph.
1030 pm HST August 31
Reflectivity {click for full image}
Velocity {click for full image}
Midnight HST September 1
Reflectivity {click for full image}
345 AM HST September 1
Reflectivity {click for full image}
Satellite Images:
Below are a series of satellite images
showing the progression of Jimena as it approaches and moves south of the
islands. The rapid deterioration of Jimena is obvious.
2 PM HST August 31 (Visible) {click for full image}
8 PM HST August 31 (Infrared) {click for full image}
Midnight HST September 1 (Infrared) {click for full image}
6 AM HST September 1 (Infrared) {click for full image}
2 PM HST September 1 (Visible) {click for full image}
Bonus behind the scenes:
During significant weather situations, such as that presented
by Jimena, many other things happen at the Honolulu Forecast Office/Central
Pacific Hurricane Center that might not be so apparent to the general public.
One of them being issuing watches/warnings/advisories for a variety
of potential impacts for marine and aviation communities in addition to
the public at large....
another being frequent visits by the media for interviews....
...and of course lots of phone calls from media and coordination calls
with other local, state and military agencies...
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