Media Information

 
 
 
collection:
nasa new
mediatype:
image
collection:
nasa
collection:
nasanaturalhazards
title:
Tropical Cyclone Heta: Natural Hazards
description:
Heta meandered northwest of Samoa over the weekend before turning south and passing just west of the islands on Monday, January 5, 2004. Winds up to 105 miles per hour buffeted the islands knocking out power, uprooting trees, and causing extensive roof damage. After passing Samoa, Heta continued southeast and intensified with sustained winds estimated at 133 miles per hour and gusts of up to 185 miles per hour as it was headed for the tiny island nation of Niue.

The trmm.gsfc.nasa.gov/ Tropical Rainfall Measuring Mission (TRMM) satellite captured these impressive images of Cyclone Heta as it was passing just west of Samoa. The images were taken at 6:08 UTC on January 5, 2004.

This image shows a vertical cross section through the eye of the storm from the TRMM PR. It shows areas of heavy rainfall (red areas) extending upwards to midlevels in the eyewalls and in an outer rainband as well as deep convective towers surrounding the eye extending to upper levels (blue areas above red areas). earthobservatory.nas a.gov/NaturalHazards /natural_hazards_v2. php3?img_id=11897 Another image shows the horizontal distribution of rain rates as seen from above by the TRMM satellite.

TRMM reveals that Heta has a double eyewall structure, which can sometimes occur in mature, intense tropical cyclones. The outer eyewall, the intense band of heavy, 2-inch-per-hour rain rates shown by the dark red circle completely surrounds a partial inner eyewall shown by the smaller dark red semicircle. Tropical cyclones act as large heat engines. When water vapor condenses into the cloud droplets that form the precipitation, heat, known as latent heat, is released and drives the storm. Generally, the more heat that is released, the more powerful the storm will become. This heating is also most effective near the center of the storm as is the case with Heta.

TRMM is a joint mission between NASA and the Japanese space agency NASDA.

Images produced by Hal Pierce (SSAI/NASA GSFC) and caption by Steve Lang (SSAI/NASA GSFC)
subject:
Where -- Goddard Space Flight Center (GSFC)
subject:
What -- Tropical Rainfall Measuring Mission (TRMM)
subject:
Where -- Samoa
what:
Tropical Rainfall Measuring Mission (TRMM)
where:
Goddard Space Flight Center (GSFC)
where:
Samoa
identifier:
heta_vertical_trmm20 04005
uploader:
gwilliam@archive.org
addeddate:
2011-07-24 04:54:41
publicdate:
2011-07-24 04:54:41
creator:
NASA -- NASA Image Of The Day
ImageUID:
file:/home/lunaadmin /Source_download/201 107/1/heta_vertical_ trmm2004005/heta_ver tical_trmm2004005_lr g.jpg
filename:
heta_vertical_trmm20 04005_lrg.jpg
date:
2004-01-05
rights:
Public Domain
source:
year:
2004
language:
eng

Tropical Cyclone Heta: Natural Hazards