Matthew’s Total Rainfall

Matthew's Total Rainfall

NASA Adds Up Deadly Hurricane Matthew’s Total Rainfall  

A NASA rainfall analysis estimated the amount of rainfall generated by Hurricane Matthew when it moved over the Carolinas.

Hurricane Matthew dropped a lot of rain, caused flooding and deaths in the state of North Carolina. Flooding is still widespread in North Carolina.  Some rivers in North Carolina such as the Tar and the Neuse Rivers were still rising on Oct. 12.

At NASA’s Goddard Space Flight Center in Greenbelt, Maryland a rainfall analysis was accomplished using data from NASA’s Integrated Multi-satellitE Retrievals for GPM (IMERG). The GPM or Global Precipitation Measurement mission is a joint mission between NASA and the Japanese space agency JAXA.

Matthew's Total Rainfall

The Integrated Multi-satellitE Retrievals for GPM (IMERG) is a unified U.S. algorithm that provides a multi-satellite precipitation product. IMERG is run twice in near-real time with the “Early” multi-satellite product being created at about 4 hours after observation time and a “Late” multi-satellite product provided at about 12 hours after observation time.

This rainfall analysis was created using IMERG real time data covering the period from Sept. 28 through Oct. 10, 2016. The totals included some rain from a low pressure area that moved through the area near the end of September.

Hurricane Matthew’s interaction with a frontal boundary caused extreme rainfall in North Carolina resulting in over 20 inches (508 mm) of rain being reported in North Carolina. The area was already saturated before Hurricane Matthew arrived. Heavy rainfall from a slow moving low and frontal system moved through during the last week of September. Maximum rainfall total estimates for the real-time IMERG product have been adjusted to reflect observed values.

On Wednesday, Oct. 12 the National Weather Service (NWS) in Wilmington, North Carolina (NC) reported “All major area rivers will remain above flood stage throughout this upcoming week. At 10:59 a.m. EDT on Oct. 12, the North Carolina Department of Transportation reported numerous flooded roads persisting across much the coastal plain of North Carolina. This being the result of heavy rainfall totaling 5 to 12 inches across the region in the last 36 hours. Many roads are impassable, barricaded or washed away. Some neighborhoods are cut off. Swamps, creeks and rivers are still rising flooding even more areas and slowing the recession of high water. People in the warned area should not travel and be prepared for widespread flooding of a magnitude not seen in many years. If asked to evacuate please do so.”

Further south, a Flood Warning has been extended for the following rivers: Cape Fear at Elizabethtown affecting Bladen County NC; Cape Fear at Lock and Dam 1 affecting Bladen County NC; Black Creek at Quinby affecting Darlington and Florence Counties South Carolina (SC); Lynches at Effingham affecting Florence County SC.

In addition, a Flood Warning continues for the following rivers: Cape Fear at William O. Huske Lock and Dam 3 affecting Bladen County NC; Northeast Cape Fear near Burgaw affecting Pender County NC; Lumber Near Lumberton affecting Robeson County NC;  Little Pee Dee at Galivants Ferry affecting Dillon, Horry and Marion Counties,  SC;  Waccamaw at Conway affecting Horry County SC;  Great Pee Dee at Pee Dee affecting Marion and Florence Counties SC; and Black at Kingstree affecting Williamsburg County SC.

source:world press news

NASA Analyzes Heavy Rainfall

NASA Analyzes Heavy Rainfall

Slow moving frontal systems draped over Hispaniola and a tropical wave recently caused heavy rainfall that led to wide spread flooding over the northern Dominican Republic. NASA analyzed that heavy rainfall using data from satellites.

Scattered to numerous showers and scattered thunderstorms have occurred over Hispaniola during the week of Nov. 14. Hispaniola includes the Dominican Republic and Haiti.

The Global Precipitation Measurement mission or GPM core satellite can analyze rainfall rates from space. GPM is a joint mission between NASA and the Japanese space agency JAXA.

NASA’s Integrated Multi-satellite Retrievals for GPM (IMERG) were used to estimate totals for rainfall that fell over the Dominican Republic during the period from Nov. 8 to 15, 2016. IMERG data indicates that rainfall totals of greater than 230 mm (9 inches) fell over the northeastern Dominican Republic during this period. Estimates of real-time IMERG rainfall totals have been adjusted to reflect observed values in similar extreme events.

NASA Analyzes Heavy Rainfall

The Integrated Multi-satellitE Retrievals for GPM (IMERG) creates a merged precipitation product from the GPM constellation of satellites. These satellites include DMSPs from the U.S. Department of Defense, GCOM-W from the Japan Aerospace Exploration Agency (JAXA), Megha-Tropiques from the Centre National D’etudies Spatiales (CNES) and Indian Space Research Organization (ISRO), NOAA series from the National Oceanic and Atmospheric Administration (NOAA), Suomi-NPP from NOAA-NASA, and MetOps from the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT).  All of the instruments (radiometers) onboard the constellation partners are inter-calibrated with information from the GPM Core Observatory’s GPM Microwave Imager (GMI) and Dual-frequency Precipitation Radar (DPR).
On Nov. 18, the National Hurricane Center discussion noted “A stationary front extends from the west-central Atlantic near 20 degrees north latitude and 70 degrees west longitude, then along the north coast of the island to the Windward Passage continuing over the west Caribbean. A surface trough (elongated area of low pressure) is just south of the Mona Passage and coupled with the frontal boundary are generating scattered showers possible isolated thunderstorms over the Dominican Republic this morning. This front will lie across the north portion of the island through Saturday, and coupled with the surface trough moving through the central Caribbean will give the island scattered showers and possible isolated thunderstorms spreading west across the island today and will persist through Saturday.”

For information from the National Weather Service of Puerto Rico on how that system is affecting the region, go to: http://www.weather.gov/sju/

In addition to that system, a broad area of low pressure designated as System 90L in the southwestern Caribbean is also being monitored for possible tropical cyclone development by the National Hurricane Center. Very warm sea surface temperatures and upper level winds are expected to provide favorable conditions for tropical cyclone development in that area.

source: world news,press news

NASA’s Solar Dynamics Observatory

NASA’s SDO Performs Calibration Maneuvers

NASA’s SDO Performs Calibration Maneuvers

On Oct. 19, 2016, operators instructed NASA’s Solar Dynamics Observatory, or SDO, to look up and down and then side to side over the course of six hours, as if tracing a great plus sign in space. During this time, SDO produced some unusual data. Taken every 12 seconds, SDO images show the sun dodging in and out of the frame. SDO captured these images in extreme ultraviolet light, a type of light that is invisible to our eyes. Here, they are colorized in red.

NASA’s SDO Performs Calibration Maneuvers

SDO operators schedule this maneuver, one of a series of maneuvers that SDO completed on Oct. 27, 2016, twice a year to calibrate the spacecraft’s instruments. Veering motions allow scientists to assess how light travels through SDO’s instruments – whether light is reflected inside the instrument, for example – and how these instruments are changing over time.NASA’s SDO Performs Calibration Maneuvers

This particular maneuver is the EVE cruciform maneuver, designed to help SDO’s Extreme ultraviolet Variability Experiment, or EVE, take accurate measurements of the sun’s extreme UV emissions. EVE studies these emissions over time, so that we may better understand their role in influencing Earth’s climate and local space environment.

source: world press news