Using this difference, one can estimate how far away the bolt of lightning is by timing the interval between seeing the flash and hearing thunder. The speed of sound in dry air is approximately 343 m/s or 1,127 ft/s or 768 mph (1,236 km/h) at 20 Â°C (68 Â°F).
From Wikipedia, the free encyclopedia. Fort Pierce is a city in and the county seat of St. Lucie County, Florida, United States. It is also known as the Sunrise City, sister to San Francisco, California, the Sunset City. The population was 41,590 at the 2010 census. As of 2012, the population recorded by the U.S. Census Bureau was 42,645.
A Life Stolen Early. The weather in Fort Pierce, on Floridaâs east coast, was sunny and unseasonably warm on a recent September afternoon. But inside her parentsâ three-bedroom house, 22-year-old Kimberly Bergalis lay shivering on the family-room sofa, worn out from a trip to the beach just a block away.