NEW ORLEANS - After most of New Orleans sat submerged in water for weeks after Hurricane Katrina, the eight months since Oct. 1 have been the driest southern Louisiana has been during the 111 years that records have been kept, the state climatologist says. Since October, most of the southern half of the state has averaged just 21 inches of rain, down from the usual 40-inch average, climatologist Barry Keim said. The National Weather Service says the rest of June promises more of the same. "We're in what's called extreme drought," Keim said of the state's record-breaking dry spell. "We've...