Pre-Flight Planning
Prior to departure, the captain reviewed available weather reports and was aware of current conditions, including SIGMETs. He decided to fly a course parallel to a frontal system until reaching an area where he could continue to the destination.
In-Flight Events
After departure, the seat belt sign was left on, but the captain did not brief passengers to expect turbulence nor restrict flight attendants to their seats, as he did not anticipate encountering turbulence. While cruising at 17,000 feet MSL, the captain used onboard weather radar and ATC advisories to identify adverse weather. After turning to avoid an area of heavy precipitation, the aircraft encountered turbulence. At that time, three flight attendants and one passenger were walking in the aisle. One passenger sustained a serious injury. Additionally, one flight attendant and six passengers received minor injuries.
Return and Landing
The aircraft was flown back to Tampa, Florida, where it landed without further incident.