Intensifying heat waves prompt health warnings for Europe, US

News Snapshot:

PHOENIX, July 18 (Reuters) - A global pattern of heat waves scorching parts of Europe, Asia and the United States intensified on Tuesday, with the World Meteorological Organization warning of an increased risk of deaths linked to excessively high temperatures. Americans were facing a medley of extreme weather, from blazing heat from Texas to Southern California to smoke-choked air wafting into the Midwest from Canada's wildfires. Flood warnings were up for Vermont towns that were inundated just last week, while Tropical Storm Calvin was expected to hit the Pacific island state of Hawaii later on Tuesday. The southwestern city of...