Observing Superstorm Sandy with VIIRS and ASTER Data: A 5 Year Review

July 06, 2017
Sandy GIF

A GIF of VIIRS daily imagery of Hurricane Sandy forming in the Caribbean, moving up along the east coast of the United States, and finally dissipating in the Great Lakes region and Canada

Forecasters from NOAA’s Climate Prediction Center have stated that the Atlantic hurricane season, June 1 to November 30, will most likely be above average this year due to a weak El Niño, sea-surface temperatures at near or above average across the Atlantic Ocean and Caribbean Sea, and average or weaker than average changes of winds at different heights in the area. This prediction is a reminder of the 5-year anniversary of Superstorm Sandy, the second costliest U.S. Atlantic hurricane, which caused devastation in the Caribbean and along the east coast of the United States.

Remote sensing data showed the evolution of the lifecycle and impacts of Superstorm Sandy, as well as in the recovery of ecosystems in the years following the event. Lower resolution instruments, which capture a larger area but with less detail, like the Visible Infrared Imaging Radiometer Suite (VIIRS), can be used to observe the formation, strength, movement, and dissipation of hurricanes. On the other hand, moderate or higher resolution instruments, which observe a smaller area in greater detail, like the Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), can be used to assess the damage caused by hurricanes, storms, or other natural disasters.

Over Superstorm Sandy’s 12 day period the VIIRS satellite sensor, flying onboard the Suomi National Polar-orbiting Partnership (NPP) satellite, captured the storm from its formation in the Caribbean to its dissipation over the Eastern U.S. and Canada. Follow along with the VIIRS Daily Surface Reflectance (VNP09CMG) imagery animation to the right to observe Superstorm Sandy.

The storm that would become Superstorm Sandy was detected on October 22, 2012 off the coast of Nicaragua. The next day, October 23, cloud cover from the storm extended over 440 kilometers (km), or nearly 290 miles (m), as observed by VIIRS. Sandy then became a Category 1 hurricane on October 24, dropping more than 20 inches of rain over Hispaniola as it moved towards Jamaica. By October 25, Sandy strengthened to a Category 2 hurricane, growing to 633 km (303 m) in diameter, and made landfall over Cuba. Hurricane Sandy downgraded to a Category 1 hurricane on October 26; however, a new danger approached. Based on Tropical Rainfall Measuring Mission (TRMM) data, forecasters found that Hurricane Sandy was going to collide with a powerful cold front and Arctic air. This cold front caused Sandy to turn its destructive path towards Baltimore, MD, Washington, DC, Philadelphia, PA, and New York, NY. As the storm merged with the cold front it became more powerful and reached over 3218 km (2,000 m) in diameter. By October 28, Hurricane Sandy covered one-third of the U.S. As the storm collided with the Arctic air, it brought 36 inches of snow to parts of the Appalachian Mountains over the next four days. A VIIRS image from October 29 showed the storm had grown to over 1.8 million square miles over land and open ocean that is typically too cold to sustain hurricanes. The now post-tropical nor’easter storm reached from the Carolinas into the Ohio Valley, throughout New England, and into eastern Canada. On the night of the October 29 Sandy made landfall in New Jersey and caused a 14 feet storm surge near New York City, flooding the parts of the subway system. Damages to New Jersey and New York were captured by Terra ASTER and can be viewed below. The next day, October 30, Sandy began to weaken as it moved over Pennsylvania. By October 31, the storm was downgraded to a remnant low pressure area. It finally dissipated over the Great Lakes region and eastern Canada.

Destruction was left in Superstorm Sandy’s wake. Approximately 233 fatalities were recorded due to the storm. In the U.S. alone over 650,000 homes were either damaged or destroyed with over $50 billion worth of damage to 24 U.S. states. Five years later, some of the areas hit hardest by the storm have made attempts to recover by building steel walls and man-made dunes to prevent flooding from storm surges. Some residents have rebuilt their homes on stilts, preparing for flood waters from the next storm. Other areas have been left abandoned as residents move closer inland or to entirely different areas. Some areas have been reverted back to marshes and other natural habitats that existed before residents built houses along the shore. A glimpse of the destruction from Superstorm Sandy was captured by the Terra ASTER instrument. ASTER data can be used to distinguish vegetation from non-vegetation, and to identify damage to roads, homes, and other structures throughout the impacted area. This allows assessment teams to be able to better understand what areas need more assistance. Several of the most impacted areas are shown in the ASTER Precision Terrain Corrected (AST_L1T) images below. Compare the images to see what areas in New Jersey and New York looked like prior to Superstorm Sandy, immediately after the storm, and during June 2017. The captions below describe the damage in each area.

Just as they were for Superstorm Sandy, remote sensing data products, such as those distributed by the LP DAAC, will be essential for observing hurricanes and their path during the 2017 Atlantic hurricane season.

References:

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Material written by Danielle Golon​1

1 Innovate!, Inc., contractor to the U.S. Geological Survey, Earth Resources Observation and Science (EROS) Center, Sioux Falls, South Dakota, USA. Work performed under USGS contract G15PD00403 for LP DAAC2.

2 LP DAAC Work performed under NASA contract NNG14HH33I.