Topic: Rainfall

TVA River Management Handles Rainy 2018, Prepares for New Year

December 30, 2018 |

Tennessee Valley Authority (TVA)

Knoxville, TN – As 2018 draws to a close, yearly rainfall totals for the Tennessee Valley Authority (TVA) region continue to climb to near record levels, and the trend for above average rainfall totals continues right up to year’s end.

“For the week before Christmas, rainfall averaged 2 inches in the eastern Valley and 1.4 inches in the western Valley,” said James Everett, senior manager for TVA’s River Forecast Center. “We began spilling and sluicing at several locations the day after Christmas to increase flows and increase flood storage capacity, and that will likely continue into the New Year.”

TVA’s River Management team is continuing its work over the holidays by doing what it’s been doing a lot this year: handling above average amounts rainfall and runoff across the Valley.

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NASA has new Model for finding Landslide Threats in Near Real-Time

March 23, 2018 |

Written by Kasha Patel
NASA’s Goddard Space Flight Center

Greenbelt, MD – For the first time, scientists can look at landslide threats anywhere around the world in near real-time, thanks to satellite data and a new model developed by NASA.

The model, developed at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, estimates potential landslide activity triggered by rainfall. Rainfall is the most widespread trigger of landslides around the world. If conditions beneath Earth’s surface are already unstable, heavy rains act as the last straw that causes mud, rocks or debris — or all combined — to move rapidly down mountains and hillsides.

This graphic shows the potential landslide activity in December averaged over the last 15 years as evaluated by NASA’s Landslide Hazard Assessment model for Situational Awareness model. Here, you can see landslide trends across the world. (NASA’s Goddard Space Flight Center / Scientific Visualization Studio)

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NASA uses IMERG to estimate Hurricane Harvey’s Rainfall amount

August 29, 2017 |

Written by Rob Gutro / Steve Lang
NASA’s Goddard Space Flight Center

Greenbelt, MD – At NASA’s Goddard Space Flight Center in Greenbelt, Maryland, an analysis of Hurricane Harvey’s tremendous rainfall was created using eight days of satellite data.

NASA’s Integrated Multi-satellitE Retrievals for GPM or IMERG product is used to make estimates of precipitation from a combination of space-borne passive microwave sensors, including the GMI microwave sensor onboard the Global Precipitation Measurement satellite GPM core satellite, and geostationary IR (infrared) data.

GPM saw Harvey’s rainfall pattern was highly asymmetric with the bulk of the rain located north and east of the center on Aug. 27. A broad area of moderate rain (green areas) can be seen stretching from near Galveston Bay to north of Houston and back well to the west. Within this are embedded areas of heavy rain (red areas); the peak estimated rain rate from GPM at the time of this overpass was 96 mm/hour (~3.77 inches per hour). (NASA/JAXA, Hal Pierce)

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NASA Gravity Recovery and Climate Experiment spacecraft data reveals Australia had Biggest Role in Sea Level Drop

August 20, 2013 |

Pasadena, CA – A unique and complex set of circumstances came together over Australia from 2010 to 2011 to cause Earth’s smallest continent to be the biggest contributor to the observed drop in global sea level rise during that time, finds a new study co-authored and co-funded by NASA.

In 2011, scientists at NASA’s Jet Propulsion Laboratory in Pasadena, CA, and the University of Colorado at Boulder reported that between early 2010 and summer 2011, global sea level fell sharply, by about a quarter of an inch, or half a centimeter.

Changes in Australia’s mass as reported by data from NASA’s Gravity Recovery and Climate Experiment (GRACE) satellites from June 2010 to February 2011. Areas in greens and blues depict the greatest increases in mass, caused by excessive precipitation. The contour lines represent various land surface elevations. (Credit: NCAR/NASA/JPL-Caltech)

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NASA Study reveals degradation of Amazon Forest due to Climate Change

January 22, 2013 |

Written by Alan Buis
NASA’s Jet Propulsion Laboratory

Pasadena, CA – An area of the Amazon rainforest twice the size of California continues to suffer from the effects of a megadrought that began in 2005, finds a new NASA-led study.

These results, together with observed recurrences of droughts every few years and associated damage to the forests in southern and western Amazonia in the past decade, suggest these rainforests may be showing the first signs of potential large-scale degradation due to climate change.

The megadrought in the Amazon rainforest during the summer of 2005 caused widespread damage and die-offs to trees, as depicted in this photo taken in Western Amazonia in Brazil. (Image credit: NASA/JPL-Caltech)

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