Monday, December 12, 2016

Storms to offer one-two punch this week

From the National Weather Service:
A series of Pacific storm systems will impact the region Tuesday through Friday. The first system will move in for Tuesday and Wednesday with heaviest precipitation north of Interstate 80. Snow levels will be rising so travel impacts may be limited. The stronger and much more impactful storm will arrive Thursday into Friday. Creeks and streams are still running high, and significant rainfall could bring additional flooding. Gusty winds could bring widespread downed trees and power outages. Snow levels will initially be high, but will rapidly lower Thursday evening below pass levels. Gusty winds and snow could bring near white-out conditions.

Urban, small stream, and burn scar flooding possible. Highest potential over mountains
White-out conditions possible with chain controls and significant travel delays over mountain passes Thursday-Friday
Gusty winds may bring widespread downed trees and power outages Thursday-Friday
Travel delays and accidents due to slick or snow-covered roads

Forecast Confidence
High confidence in stormy weather
Medium confidence in precipitation amounts and snow levels

Timing and Strength
Storm 1: Tuesday - Wednesday

Weaker system. Precipitation mainly from Interstate 80 northward
Snow levels 4000-5000 feet Tuesday, rising above pass levels Wednesday
Storm 2: Thursday - Friday
Stronger and more impactful storm
Higher likelihood for flooding. See attached precipitation graphic for week-long precipitation total (most of which will come with Storm 2)
Snow levels initially 7000+ feet. Heavy snow possible Thursday evening into Friday as snow levels rapidly drop to 2000-4000 feet.
Gusty winds 45-55 mph possible across the Valley
The Shingletown Medical Center is offering cold-weather tips, per the East Valley Times.

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