Monday, January 9, 2017

#CAStorm update: Round 2 to feature 'very heavy snow'

From the National Weather Service:
Precipitation tapers off today, but another storm will impact the area Tuesday through Wednesday. Besides flooding, the major concern is very heavy snow and strong winds, especially over the Sierra Tuesday through Wednesday. Significant travel hazards for mountain areas and severe whiteout conditions. Keep in mind that flooding will take several days to recede in some areas after the rain stops.

Impacts
Widespread flooding of urban areas, roadways, small streams, and main stem rivers
Enhanced downstream river flooding from flood control releases on numerous Sierra reservoirs
Mud and debris flows on burn scars from past 4 years
Rock and mudslides on mountain roadways
Downed trees and power outages from wind and saturated soils
Mountain travel hazards (chain controls, delays, accidents, closures, white-out conditions)

Forecast Confidence
High for continued flooding impacts
Medium in timing/amounts for additional storms Tuesday through Thursday

Timing and Strength
Lingering showers today
Heavy Precipitation Tuesday - Wednesday
Rain & Snow taper off Thursday
Snow levels 4000-5000 ft, locally down to 3000 ft in Shasta Co
Severe whiteout conditions
Rivers and Streams
Rising water levels today through mid-week
Several points reach flood stage today. River forecasts at http://www.cnrfc.noaa.gov/
Streams and creeks that are free-flowing (no dams) will bear close watching; no similar impacts since at least Dec 2005
Additional rises expected from Tuesday-Wednesday storm
Winds Tuesday
Valley gusts 40 to 60 mph
Mountain ridge-top gusts 50 to 70 mph

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