On September 3, NASA's Terra satellite picked up a giant O-shaped cloud over the Pacific. Scientists say a few things came into play to create this interesting formation.
3 Day Pollen Outlook
Updated: Tuesday, September 30, 2014, 7:00 AM
|Low 0-20 grains/m³||Moderate 21-80 grains/m³||High 80+ grains/m³|