VANCOUVER -- At least three separate reports warned health officials and local governments about the kind of heat waves that could cost lives in the Lower Mainland, but the analyses and documents appear to have been forgotten when they were needed most. A CTV News Vancouver investigation has uncovered documents from the B.C. Centre for Disease Control with clear criteria for a “heat health emergency” established in the wake of the region’s last deadly heat wave in 2009. Health officials have not responded to queries about those warnings and others. The most crucial document dates back to 2012. Authored by a BCCDC doctor and a researcher – both of whom also teach at UBC’s School of Population and Public Health – the document laid out a plan to prevent the kind of death toll they’d seen in the summer of 2009.