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Home NEWS Science News

NASA examines Peru’s deadly rainfall

Bioengineer by Bioengineer
March 23, 2017
in Science News
Reading Time: 2 mins read
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Credit: Credits: NASA/JAXA, Hal Pierce

The Global Precipitation Measurement mission or GPM constellation of satellites provide data on precipitation rates and totals. Recently the GPM core observatory measured the heavy rainfall that caused extensive flooding and loss of life in Peru.

Extreme flooding and frequent landslides that occurred in March have forced many from their homes. An El Niño-like condition with warm ocean waters developed near Peru's coast. This extremely warm water off Peru's western coast has been blamed for promoting the development of these storms. Equatorial sea surface temperatures (SSTs) are about average elsewhere in the central and east central Pacific.

When the GPM core observatory satellite flew above Peru on March 20, 2017 at 0826 UTC (4:26 a.m. EST) GPM identified locations of storms that were dropping heavy rainfall over northwestern Peru. Data collected by GPM's Microwave Imager (GMI) and Dual-Frequency Precipitation Radar (DPR) instruments during this pass revealed that very heavy precipitation was falling in that area. GPM's radar (DPR Ku Band) data indicated that some storms were dropping rain at the extreme rate of greater than 137 mm (5.4 inches) per hour. These extreme rainfall rates were found in the line of storms extending southwestward from Peru's coast.

The GPM satellite's Radar (DPR Ku Band) were also used to examine the 3-D structure of precipitation within the storms near and over northwestern Peru. GPM's examination showed that several storms located in the Pacific had cloud tops that were reaching altitudes above 13 km (8.1 miles). GPM is a joint mission between NASA and the Japanese space agency JAXA.

Integrated Multi-satellitE Retrievals for GPM (IMERG) data were used to show rainfall in areas that were not covered by the GPM core observatory satellite swath. Those estimates are the result of unifying precipitation measurements from a constellation of research and operational satellites. Those rainfall estimates were generated by NASA's Precipitation Processing System every half hour.

That data was made into an animation at NASA's Goddard Space Flight Center in Greenbelt, Maryland and showed real-time IMERG rainfall estimates based on data collected during the period from March 14 to 21, 2017. The animation of seven days of data showed scattered storms developing over Peru and Brazil and moving over Peru. The animation showed rainfall rates between 25 mm (~1 inch) and 50 mm (~2 inches) per hour in many storms.

On March 18, Peru's National Meteorological and Hydrological Service noted that from March 19 to 25, "rains will intensify on the north coast and the entire western slope of the Sierra. On the north coast (La Libertad, Lambayeque, Piura and Tumbes) heavy rains accompanied by [lightning] will intensify between March 19 and 23. In the interior of Piura and Lambayeque, the rainfall is expected to exceed 150 mm per day (~6 inches); while in the coastal zone of Piura, Lambayeque, Tumbes and the interior of La Libertad, it could exceed 50 mm per day (~ 2 inches). "

###

For updated conditions in Peru, visit Peru's National Meteorological and Hydrological Service website: http://www.senamhi.gob.pe/.

Media Contact

Rob Gutro
[email protected]
@NASAGoddard

http://www.nasa.gov/goddard

############

Story Source: Materials provided by Scienmag

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