An improbable tidal-wave warning sent out over the Eagle County emergency-broadcast system on Wednesday had residents of Gypsum, elevation 6,334 feet, questioning whether they needed to dig out life preservers or scramble for higher ground. Four radio stations in the landlocked mountain community sounded the jarring alert about 7:15 a.m., the result of a weekly test of the county warning system that went awry. "I figured it was just a test, and then a female voice came on afterwards and said something like, 'Attention Gypsum residents: You must evacuate now.' Then it went back to the Allman Brothers album I...