NEVADA CITY, Calif. November 30, 2012 - The ongoing storm event is bringing 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 in Sacramento has issued an updated overview of what's to come:
Very impressive rain amounts were reported across the region Thursday Night into Friday as the second in a series of three storms moved across the region. Rainfall rates will slacken late Friday and give way to less frequent but still very heavy showers through much of Saturday. This decrease in rainfall rates will allow for some recovery time for small streams and creeks prior to the onset of the next and last round of intense rain beginning overnight Saturday and continuing through early Sunday. Wind with the this next system will be slightly stronger in terms of impacts than those we saw over the region Thursday Night into Friday.
What about after this event? After about midday Sunday the rain will dramatically diminish and dry weather will develop. Another system may affect the area toward the middle of next week, however, that system now appears less intense than our recent storms and a good break will allow plenty of time for streams to recover.
Upper level low continues off the coast with a strong moisture plume extending inland over Northern California. The Oakland Morning RAOB PW was 1.14 inches, which is 213 percent of normal. A shortwave with a surface cold front is passing through the area. Current radar shows a broad band of precipitation extending over the cwa south of Shasta County. There have been numerous reports of ponding of water on area roads, car accidents in slippery conditions and some rocks down on foothill/mountain roads. Orographic lift has brought impressive 24 hour rainfall totals to the area, with up to 8 inches reported in mountainous locations of Northern Shasta County. The northeast foothills have seen 24 hour totals up to 4 to 7 inches. This moderate to heavy rainfall will taper off by this evening as the shortwave shifts eastward with some lingering showers remaining.
A convergence area has set up narrow band of training showers and thunderstorms extending northeast of Shasta Dam/Redding. Flooding of several creeks in Shasta County has been reported and additional rainfall will add to this through the afternoon. Some flooding was also reported in Redding earlier this morning. A flood warning for urban areas and small streams has been issued for Central Shasta County through this afternoon. Small hail is also possible with these storms.
Area creeks around Sacramento that frequently cause nuisance flooding such as Deer Creek at Scott Road and Arcade Creek along Winding Way are around monitor/flood level.
A wind advisory continues with gusts up to 40 mph in the valley. This may decrease later today and tonight, with even stronger winds returning late Saturday into Sunday.
Snow levels have remained high with this mild system, generally over 7500-8000 feet, limiting impact for motorists on mountain highways. High mountain peaks have reported around 3 to 10 inches of new snow over the past 24 hours, with storm totals up to a foot and a half. Snow levels will gradually drop this afternoon but precipitation will be tapering off. May see 3 to 6 inches of wet snow around pass levels by early evening. Have cancelled the winter storm warning.
Instability behind the front over the northern portion of the forecast area is a concern for this afternoon. Satellite suggests clearing off the coast will move inland. If cloud cover breaks in the valley, conditions for thunderstorm development will be favorable. NAM12 model shear profiles strongly suggest that storms that form could develop into MESOS. Hodograph shows strong directional shear in the lower levels, strong speed shear above, creating a fish hook pattern. We will be closely watching this afternoon for the possibility of severe thunderstorms.
Update is out with added afternoon thunderstorms north of Marysville and flood warning for urban areas and small streams for Central Shasta County.
November 30, 2012 at 11:55 AM
Plumes of moisture stream across the entire Pacific basin and head toward the U.S. coastline. Over the first week of December 2012, over a foot of rain is expected to fall in parts of Northern California and up into British Columbia.
This animation shows the total precipitable water in the atmosphere for November 28 - December 6, 2012 using the NOAA Global Forecast System model - one of the main weather models used by forecasters across the world.
Dark blues are areas of high moisture content in the atmosphere. The large "tongues" of moisture can be seen extending thousands of miles across the ocean.
The animation was created by NOAA Environmental Visualization Lab. Full credit goes to them.
November 30, 2012 at 11:42 AM
El Dorado County: Rubicon Trail Safety Alert effective 1030 am Nov 30, 2012 it is not advisable to travel on the Rubicon Trail due to high winds and rain.
November 30, 2012 at 11:17 AM
An updated image of the atmospheric river, showing the merging moisture plumes. NOAA explains the graphic as follows:
An upperlevel low in the Gulf of Alaska remains stationary, creating continued heavy rain event for Northern California and coastal Oregon and Washington. Most recent impulse moving through the upper level's has moved onshore in Northern California, and appears to be weakening as cloud tops over the area have warmed slightly over the past few hrs.
Upstream, another impulse (located at 37n,130w) is strengthening with recent enhancement in WV imagery. Impulse is associated with high moisture plume...with TPW VALUES of 1-1.25" as seen in satellite blended TPW. Also merging with a moisture plume surging northward into Southern California. Expect impulse come on shore between 16-19z. current rates are 0.1-0.2"/hr with heaver rain burst of 0.25-0.4"/hr.
November 30, 2012 at 11:03 AM
Steve Nicholson and his family got lucky. Here's his storm report: How about two trees on our house? We weren't in the house when it happened so no one was injured (or scared out of their wits). The oak did very little damage.
The pine poked some big holes in the roof and let a lot of water in. The good news is that we're currently in the process of building an addition so that part of the house is empty and has no insulation or drywall so the water did minimal damage. We live off Willow Valley just out of Nevada City limits.
November 30, 2012 at 10:56 AM
Cathy Koos Breazeal sent this report: Hello from "Upper" Volcano in Amador County! Here are our weather stats for this morning:
47 degrees, 2.12 inches rain as of 8 a.m. this morning; power is on; winds are light; elevation 3960.
We received 1.90 inches with Wednesday's storm.
Meanwhile, in Hawaii...
November 30, 2012 at 10:31 AM
Thanks to Dave Carter for this sunshine sighting from Haleiwa, Oahu.
November 30, 2012 at 10:04 AM
Soda Springs: snow. From rain, currently rain/snow mix. Thanks Tim Gorman.
Nishinam Gulch Road between Highway 49 and Yuba Crest/Jones Bar Road is flooded and impassable. This is typically the case during heavy rains. Thanks Scott Young.
3-day precip forecast from the Hydrometeorological Prediction Center
November 30, 2012 at 9:51 AM
Flood Warnings - National Weather Service
* For the Truckee Basin near Truckee, Major Flooding is forecast. * For the Susan River, including Susanville, moderate flooding is forecast.
* For the Truckee River, including Reno, minor flooding is forecast.
* For the Truckee River, including Vista, moderate flooding is forecast.
* For the Steamboat Creek Basin, including Steamboat, moderate flooding is forecast.
* For the Middle Fork Feather River, including Portola, no flooding is occurring or forecast.
A second period of heavy rain will reach the area Saturday Afternoon And Continue Through Sunday. Snow levels with the second system will start near 7500 to 8000 feet and may rise as high As 10000 feet early Sunday morning. Snow levels will lower Sunday, but may not fall below 8000 feet until Sunday afternoon.
Rainfall amounts of 3 to 5 inches are possible from the Lake Tahoe Basin northward to Western Lassen County, with higher amounts up to 7 inches along and west of Highway 89. Across Western Nevada rainfall amounts 2 to 4 inches are possible in the foothills west of Highway 395, with amounts of 0.75 to 1.50 inches on valley floors in the Reno, Carson City Minden Area.
River forecasts are based on forecast rainfall and temperature conditions at time of issuance. river forecasts include current and planned reservoir releases.
November 30, 2012 at 9:15 AM
PG&E Outage report as of 8:30 am courtesy of spokesperson Brandi Ehlers:
Auburn - 1,822
Diamond Springs - 8
Garden Valley - 406
Georgetown - 166
Grass Valley - 65
Greenwood - 1
Lincoln - 254
Loomis - 16
Meadow Vista - 47
Nevada City - 188
Newcastle - 44
North San Juan - 33
Penn Valley - 47
Pilot Hill - 56
Placerville - 1,169
Pollock Pines - 6
Rescue - 11
Sheridan - 1 TOTAL - 4,340
November 30, 2012 at 8:47 AM
Reminder: Sand and Sandbags are available for residents of Nevada County
The Nevada County Office of Emergency Services would also like to remind residents that free sand and sandbags are available. The permanent location is next to the Nevada County Warehouse on the corner of Highway 49 and East Broad St. in Nevada City. Beginning Wednesday, sand and sandbags will also be available at the North San Juan Fire Station #1 and the Higgins Fire Station #21.
Residents must bring their own shovel to fill the sandbags with sand. We do request that residents only take what they plan to use for protection of their personal property in the event of flooding.
Additional preparedness information is available on the Nevada County OES website: http://www.mynevadacounty.com/nc/igs/oes/ and at the Nevada County Home and Family Emergency Preparedness Center located at the Eric Rood Administrative Center in Nevada City.
For additional questions or comments on any preparedness activities, contact the Nevada County Office of Emergency Services at firstname.lastname@example.org or 530-265-1515.
November 30, 2012 at 8:46 AM
South Lake Tahoe: Prepared for Localized Flooding and Sand Bags Available for Residents
City crews are prepared for localized flooding. The City’s Streets Department is cleaning drain outlets throughout the City and the vactor is out removing water from areas that traditionally experience drainage issues. As a reminder to residents, sand bags are available at the following locations:
Fire Station 3, 2101 Lake Tahoe Blvd.
Bijou Park, 1201 Al Tahoe Blvd.
Public Works yard, 1160 Rufus Allen Blvd.
Motor Pool, 1700 D Street
There is no cost for the sand bags and residents are limited to ten (10) sand bags per household.
To pick-up your sand bags at Fire Station 3, access the rear of the property from James Avenue. At the back of the station is a large sand mound and residents can fill their own bags. Bags and shovels are located in a bin next to the sand mound.
For Bijou Park, the sand mound and bags are located at the back loop parking area; nearest disc golf hole #1.
November 30, 2012 at 8:42 AM
Caltrans is reporting no road closures or delays on I-80, Hwy 20 or 49. Check the road conditions if you have to travel today. High winds and rain make for difficult driving conditions.
November 30, 2012 at 8:25 AM
North San Juan: No electricity or phone up off Old Mill area.
November 30, 2012 at 8:13 AM
Some rain totals for the past 24 hours:
Downieville (2915 FT)(GOES) - 5.56 in
Sierra City (4700 FT)(GOES) - 5.37 in
Nevada County Grass Valley (2400 FT)(GOES) - 3.17 in
Nevada City (CoCoRaHS)- 3.49 in
Cedar Ridge - 4.24 in
Sugar Pine (3843 FT)(GOES) - 4.20 in
Blue Canyon ETI (5280 FT)(GOES) - 4.05 in
Blue Canyon (5276 FT)(ASOS) - 3.69 in
Bear River - Rollins Reservoir (GOES) - 3.36 in
Greek Store (5600 FT)(GOES) - 2.88 in
Readers report "cold, sunny and dry in south England," and "lovely Spring weather in New Zealand."
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