NASA image produced by Hal Pierce (SSAI/NASA GSFC) and caption by Steve Lang
The cleanup and relief efforts from the recent tsunamis continue in coastal
communities that were ravaged by the waves all across the Indian Ocean. Heavy
rains have further complicated the matter and added to the misery in parts of
eastern Sri Lanka. Between December 28, 2004, and January 5, 2005, up to 10 to 15 inches of rain may have fallen along the southeast coast of the island, and as much as 20 inches (red areas) fell just offshore. This rainfall map was created by the TRMM-based, near-real time Multi-satellite Precipitation
Analysis (MPA) at the NASA Goddard Space Flight Center, which monitors rainfall over
the global tropics. The map shows that many other regions around the Indian Ocean were also affected by the rains, including Malaysia and parts of Sumatra.
The heaviest rains fell on December 31 and January 4. The rains were likely the
result of a combination of the northeast monsoon interacting with the topography
and an active phase of what is known as the Madden-Julian Oscillation (MJO)
(or 30-60 day oscillation). The MJO is a large-scale disturbance that propagates
eastward from the Indian Ocean into the West Pacific Ocean, bringing extended
periods of unsettled weather with it. Individual convective complexes within
the MJO can last on the order of a day.
TRMM is a joint mission between NASA and the Japanese space agency JAXA.
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This image originally appeared on the Earth Observatory. Click here to view the full, original record.