The National Weather Service and City and Borough of Juneau officials warned that rain falling on packed storm snow would increase the risk of localized flooding, ponding on roadways and hazardous travel.

"Rain falling on that hard packed snow, will become very icy," said Nicole Farron, NWS warning coordination meteorologist in Juneau, noting snow levels had risen above 2,000 feet and a changeover to rain began around 8 a.m. She said the heaviest rain was expected that afternoon through evening and that a flood watch remained in effect for localized flooding and ponding of water on roadways.

Farron provided snowfall figures during the briefing: 'For the month of December, we saw 82 inches of snow at the Juneau Airport' and reported 9.3 inches so far in the month; she later clarified that the seasonal normal is 87.6 inches (1991–2020 baseline) when asked by reporters.

Vicky Roberts of the Alaska Department of Transportation and Public Facilities said DOT crews were plowing and treating priority routes and that 'Fane Road will be closed starting at noon today' because avalanche activity had been detected along Thane Road and conditions could increase this evening. DOT urged drivers to slow down, give plows space and check 511 Alaska for updates.

Officials warned drivers not to attempt to drive where water depth is uncertain: if a vehicle's tailpipe reaches the water level, the vehicle can become stuck. The National Weather Service added that boats should be checked because additional water on snowfall can swamp vessels.

CBJ asked residents to open storm drains where safe to do so to reduce ponding and flooding and to report observed flooding to officials. Local agencies said they would continue monitoring and issue updated statements as conditions evolve.

Next steps: residents should avoid unnecessary travel during heavy rain, monitor 511 Alaska for roadway updates, and follow CBJ and NWS advisories for flood and travel conditions.