The storm formed late on May 30 , 2008 , and was designated Tropical Storm Arthur near the Belize coast early on May 31 , developing out of the interaction between a tropical wave and the remnants of Tropical Storm Alma , and made landfall on Belize later that day .
Tropical Storm Arthur formed near the Belize coast late on May 30 , forming out of the interaction between a tropical wave and what was left of Tropical Storm Alma , which was a tropical storm in the East Pacific .