Christmas Day is expected to be a balmy 46 degrees.
Officials called for a "Request for Proposals" to study and design the system.
Snowfall accumulation will be less than half an inch, according to the National Weather Service.
Police believe criminals think officers won't get out of their cars to check rooftops.
The city is bracing for downpours and wind gusts of up to 50 mph Tuesday, forecasters said.
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