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Due to the treacherous terrain and the area’s track record of challenging rescues, the duty officer immediately requested helicopter support from the U.S.

The duty officer collects information about weather forecasts, such as heat waves, atmospheric rivers and high winds, and may recommend initiating an adverse weather coordination conference call, according to EMD guidelines.

The Jan. 3 email was sent at 2:30 p.m. by Jillian de Vela, a duty officer with the EMD, to an internal group called “EMD Adverse Weather,” which includes more than 100 officials, including firefighters, police officers, and Department of Water and Power and L.A.

The department’s duty officer, a position that rotates among staffers, is charged with notifying “relevant stakeholders” — including the mayor’s team — about preparations that have been made before threatening weather conditions, according to the agency’s 123-page adverse weather guidebook.

Ryan Sexton, a command duty officer at Coast Guard Sector Puget Sound, said in a statement.