Landsat offers stunning comparison of flooding

May 20, 2011 By Patrick Lynch and Matt Radcliff
Screen capture from video showing the Mississippi before and after the recent flooding. Credit: NASA

Extreme rainfall and heavy snowmelt have combined this spring to bring the Mississippi River roaring beyond its banks. While humans on the ground have scrambled to evacuate, build sandbag walls and taken dramatic measures not seen in decades – blowing levees and opening the Morganza Spillway – satellites have provided a distinct view of the extraordinary extent of the flooding.

The Landsat 5 satellite flew over the Mississippi on May 10, 2011, about eight days after the Army Corps of Engineers began blasting holes in earthen levees near Cairo, Illinois, when the river had reached a depth of 61 feet. Breaching the levee at the Birds Point-New Madrid floodway, where the Ohio and Mississippi rivers meet, allowed water to run onto 133,000 acres of designated floodway land. But the blasting protected about 2.4 million acres downriver, the Army Corps said.

Putting the May 10 image side-by-side with an image from April 2010 shows the dramatic extent of the flooding. At one spot along the Kentucky-Missouri border, the width of floodwaters stretches 13 miles. In Memphis, the depth of the floodwaters reached 48 feet, inches below a record set in 1937.

Illinois, Indiana, Kentucky, Ohio, Pennsylvania and West Virginia – all of which at least partially drain to the Ohio and Mississippi rivers – each had their wettest April since 1895, according to NOAA's National Climatic Data Center. The 12 months from May 2010 to April 2011 were also the wettest on record for Minnesota, North Dakota and Wisconsin.

On May 14 – after this Landsat image was captured – the Army Corps opened the Morganza Spillway in Louisiana to relieve flooding.

Landsat is a joint mission between NASA and US Geological Survey, and is the longest-running Earth-observing satellite program. Landsat satellites have been orbiting continuously since 1972. The next satellite in the series is scheduled to launch in 2012 as part of the Landsat Data Continuity Mission (LDCM).

Explore further: NASA sees Hurricane Edouard far from US, but creating rough surf

add to favorites email to friend print save as pdf

Related Stories

Mississippi crests in Memphis at nearly 48 feet

May 10, 2011

(AP) -- The Mississippi River crested in Memphis at nearly 48 feet on Tuesday, falling inches short of its all-time record but still soaking low-lying areas with enough water to require a massive cleanup.

Flooding peaks in Memphis; downstream danger lurks

May 10, 2011

(AP) -- As the Mississippi reaches its high point in Memphis and attention turns to a time-consuming clean up, farmers downriver built homemade levees to protect their crops and engineers diverted water into ...

Recommended for you

NASA sees Odile soaking Mexico and southwestern US

2 hours ago

Tropical Storm Odile continues to spread moisture and generate strong thunderstorms with heavy rainfall over northern Mexico's mainland and the Baja California as well as the southwestern U.S. NASA's Tropical ...

NASA sees Tropical Storm Polo intensifying

2 hours ago

Tropical storm warnings now issued for a portion of the Southwestern coast of Mexico as Polo continues to strengthen. Infrared imagery from NASA's Aqua satellite showed powerful thunderstorms around the center ...

User comments : 0