Intense rainfall in northern and eastern Colorado brought widespread, destructive flooding in mid-September 2013. Local citizens reported as much as 18 inches (46 centimeters) of rain from September 9 to 15, with some of the heaviest accumulation along the front range of the Rocky Mountains. A break in the precipitation allowed the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite to acquire the top image of the floods on September 14. The lower image, taken by Terra MODIS on September 7, 2013, shows the region before the rains began.
The images were made from infrared light to increase the contrast between water and land. Water is typically black or dark blue in these images, but here the sediment-laden water and muddy ground are light blue. (In the true-color version, the muddy river blends with the brown landscape that surrounds it.) Irrigated farmland is bright green, while natural vegetation and bare ground are pale green and tan, respectively. Bright blue and white clouds still cover cities along the front of the Rocky Mountains, including Denver, Boulder, Loveland, and Fort Collins.
The South Platte River and its tributaries are swollen in the September 14 image. The South Platte peaked at 18.79 feet (5.73 meters) immediately east of Greeley on September 13 and was beginning to fall when the image was taken. Flood stage is 10 feet (3 meters).
Flooding throughout Colorado has forced the evacuation of 11,750 people. Five people had died and 1,253 were missing as of September 15, according to the Colorado Office of Emergency Management. Many roads shown in image area are closed. U.S. President Obama issued a disaster declaration for 15 counties in Colorado.
- Colorado Office of Emergency Management (2013, September 15) State EOC: Publis information status report. Accessed September 16, 2013.
- Colorado Office of Emergency Management (2013, September 15) Media release: 12 counties added to Colorado disaster declaration for emergency assistance. Accessed September 16, 2013.
- Community Collaborative Rain, Hail & Snow Network (2013, September 16) List multi-day precipitation reports. Accessed September 16, 2013.
- COTrip (2013, September 16) Road conditions. Accessed September 16, 2013.
- Denver Post (2013, September 16) Colorado flooding 2013: Map of rain totals. Accessed September 16, 2013.
- National Weather Service Advanced Hydrologic Prediction Service (2013, September 16) South Platte River near Kersey Accessed September 16, 2013.
- National Weather Service weather forecast office Denver/Boulder, CO (2013, September 16) Denver/Boulder, CO. Accessed September 16, 2013.
NASA images courtesy LANCE/EOSDIS MODIS Rapid Response Team at NASA GSFC. Caption by Holli Riebeek.
- Aqua - MODIS