Heavy Snow — Upper Koyukuk Valley, Alaska

2005-04-17 to 2005-04-18 · Upper Koyukuk Valley, Alaska

Wider weather episode

Heavy snow occurred in several places in the interior as an Arctic front moved southeast on the 17th through 19th. In the Bettles area. Snow started at 0900 AST on the 16th. Total accumulation was 9.1 inches. Snow occurred from slow cooling from an Arctic Front drifting southeast over the area and warm moist air overrunning the region. Along the Alaska Range zones, the front pushed moist air upslope to increase the cooling and produced:Zone 225 - 10.7 inches of snow in 24 hours at Denali National Park Headquarters. Snow began early in the morning of the 17th with a total accumulation of 15.5 inches through early morning of the 19th.Zone 226 - 18 inches of snow reported by the Alaska Highway Maintenance camp at Trims on the Richardson Highway. Snow began on the 17th; time unknown.

Source: NOAA Storm Events Database, event_id 5446598. Narrative written by the NWS forecast office that issued the report.