Day 2 of the ongoing storm event brings more heavy rains, high wind gusts and snow in the very high elevations. The atmospheric river of moisture is causing flooding of small streams and creeks - mud flows and landslides are a possibility.
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The National Weather Service has issued a wind advisory - starting later tonight through Sunday for gusts up to 55 mph.
Satellite Precipitation Estimate (SPENES) by NOAA
December 1, 2012 at 9:58 AM
The National Weather Service in Sacramento issued the following update:
Strong westerly flow continues to bring deep moisture into Northern California this morning with orographics enhancing rainfall at higher elevations. This has lead to widespread showers over the area this morning with a few heavier bands possible. One heavy band is setting up near Shasta Dam and will need to monitor this area for possible flood products this afternoon.
Most valley areas will have QPF values under 0.50 inches this afternoon. Although up to 3 inches could fall with heavier bands and in orographically favored spots.
Latest sat images indicate PWAT values between 1.00-1.50 inches over the Eastern Pacific which is near 200 pct above normal.
Strong upper low is near the west coast of British Columbia, disturbance is rotating south of the upper low near 44N/135W. This system and its associated 40-80 kt low/mid level jet will advect deep moisture into NorCal tonight and sunday, with major flood concerns.
Carlton Campground on the North Yuba, Friday at noon. Picture courtesy USFS
Bearproof locker at Carlton Campground. Picture courtesy USFS
December 1, 2012 at 8:57 AM
These pictures from the USFS Carlton campground on Hwy 49 near Downieville were taken on Friday. The concrete picnic tables seen in the first picture, as well as the bearproof (fish-proof?) locker were resisting the rapidly rising waters.
The North Yuba peaked yesterday around noon from Thursday/Friday's storm.
December 1, 2012 at 8:45 AM
Unsettled weather continues today with the third storm wave arriving late tonight into Sunday. Graphic on the left indicates the total amount of liquid precipitation forecast between this morning and through Sunday night. Most of this will be rain as snow levels today are around 7000 ft or higher and may lower to 6000 ft by Sunday night.
Motorists traveling over the Sierra should note that they could encounter snow Sunday evening. Another impact will be strong Southerly winds across NorCal. Highest winds expected later tonight through Sunday afternoon.
The graphic on the right depicts the peak sustained winds occurring early Sunday morning between 4-10 am. Wind gusts could be much stronger and contribute to power outages.
By Sunday, soils will be well saturated increasing the probability of mud slides. Rivers and streams will rise again with the additional rainfall as the threat of flooding continues. Residents in towns and cities should also prepare for urban flooding.
The Forks... Downie and No Yuba join forces in Downieville. Image Liz Fisher
Downie River in Downieville back side of Riverside Inn. Image Liz Fisher
December 1, 2012 at 12:17 AM
Storm report from Liz Fisher in Downieville. A picture (or 3) is worth a thousand words sometimes. Thank you Liz.
According to NWS spokesperson Brooke Bingaman, Downieville received 5.52" of rain in the past 24 hours (midnight to midnight).
Several flood watches are in effect, more warnings and advisories are likely to be posted throughout Saturday. The strongest rainfalls are yet to come, as you can see from the NWS update below.
December 1, 2012 at 12:05 AM - National Weather Service update:
The wet and active pattern continues this weekend as the strongest in a series of storms drops south from the western Gulf of Alaska region.
This very dynamic storm system will push onto the West Coast and interior Northern California region Saturday into Sunday. Peak rainfall rates and the strongest winds with this very wet incoming system will be Saturday night into Sunday.
The weather will remain unsettled until then with at least scattered showers in the forecast.
Soil conditions have now become increasingly saturated so runoff into small rivers and streams will be rapid with some dramatic rises possible. Persons living near areas prone to flooding will need to keep a watch on this developing situation.
Meanwhile, the main stem rivers including the Sacramento River will see some significant rises as well by the end of the weekend. Snow levels for the mountain areas will be generally at or above the pass levels on Saturday with snow levels dropping later on Sunday. Prepare for another round of very wet and windy weather this weekend.
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