Plan B Forum

[Brutal winter weather to impact 55 million as wind chill dips below 0]
Brutal winter weather to impact 55 million as wind chill dips below 0 1:32

Several feet of snow were forecast for parts of the West as a vast, record-setting band of winter weather swept across the region, freezing many cities, inundating others with floods and spurring authorities to warn of avalanches.

Winter storm warnings were in effect across much of the western third of the country early Thursday, from California to Colorado and Wyoming, including all of Utah's Salt Lake Valley.

Up to five feet of snow was predicted for the Sierra Mountain range, ahead of another winter storm this weekend that will bring several more feet of snow and raise the flood threat to central California.

One forecaster said parts of the range could see "enormous snow totals" of 10-15 feet or more thanks to a series of "atmospheric rivers" — narrow streams of concentrated moisture in the sky — that are expected to wash over the West into early next week.

Enormous snow totals still modeled: 10-15+feet from warm, very moist series of Atmospheric Rivers down-spouting over Sierra
Next 10-days: pic.twitter.com/U1cBfPWIJy
— Ryan Maue (@RyanMaue) January 4, 2017

"We are not done yet," warned NBC forecaster Bill Karins, predicting "epic" snow totals in the Sierra range. "The mountain ranges in Utah and Colorado will also see significant snow [during Thursday]," he said.

However, the huge amounts of rain and snow could put a significant dent in California's five-year drought.

RENO, Nev. (News 4 & Fox 11) — Flood watch in effect Saturday evening Jan. 7, through late Monday, Jan. 9. The flood watch is for the Greater Lake Tahoe area and Greater Reno-Carson City-Minden area, including the cities of South Lake Tahoe, Truckee, Stateline, Incline Village, Sparks, Gardnerville and Virginia City.

An atmospheric river will produce periods of intense rainfall with snow levels as high as 9,000’ early Sunday morning to Monday morning.

Rainfall totals of 6-12 inches are possible around the Tahoe Basin and Carson Range with 2-4 inches for valley locations.

California braces for weekend floods from powerful, warm storm

Northern California and the San Joaquin Valley are bracing for potential flooding this weekend, as a massive warm storm builds up off the coast. Forecasters say rainfall amounts could reach totals not seen in more than a decade. Already, some regions north of Sacramento are issuing voluntary evacuation orders.

A flood watch was issued Thursday by the National Weather Service from Saturday afternoon through most of Monday for 24 northern counties, including Sacramento.

If the storm follows its current trajectory, forecasters say it could send a particularly large gush of water to the southern Sierra Nevada mountains and into the drought-ravaged San Joaquin Valley. Fresno, Madera, Mariposa, Tulare and Tuolumne counties are under are flash-flood warnings.


The weather service on Thursday predicted that rainfall totals from Sunday and Monday could add up to more than 10 inches in some parts of the Sierra. The foothills near Grass Valley could see as much as 15 inches fall though Monday, the weather service reported.

In Sacramento, forecasters say up to 5 inches could fall by the time the storm passes.

* * *


Before the arrival of the weekend rain, skies will clear on Thursday and Friday. Highway 50 and Interstate 80 are open after Wednesday’s closures due to avalanche control, spin-outs and poor visibility.

So far, the rainfall total for the season stands at 10.98 inches, which is 147 percent of normal.

Read more here: http://www.sacbee.com/news/weather/arti ... rylink=cpy

Tonight
A chance of rain in the evening...then rain after midnight. Lows in the 40s. East winds 5 to 15 mph.

Saturday
Breezy...rain. Highs in the upper 50s. South winds 20 to 30 mph with gusts to around 45 mph.

Saturday Night
Very windy. Rain. Rain may be heavy at times. Lows in the mid 50s. Southeast winds 20 to 30 mph increasing to 30 to 45 mph after midnight.

Sunday
Very windy. Rain. Rain may be heavy at times. Highs in the lower 60s. South winds 30 to 45 mph.

Sunday Night
Breezy...rain. Lows in the lower 50s.

Monday and Monday Night
Mostly cloudy. A chance of rain. Highs in the mid 50s. Lows in the lower 50s.

Tuesday
Breezy. Rain likely. Highs in the mid 50s.

Tuesday Night
Breezy...rain. Lows in the upper 40s.

Wednesday and Wednesday Night
Mostly cloudy. Breezy. A chance of rain. Highs in the mid 50s. Lows in the upper 40s.

Thursday
Cloudy. A chance of rain. Highs in the mid 50s.

California was bracing for an epic series of storms this weekend that could bring flooding, avalanches, blizzards and road closures.

Northern California is expected to be hit Saturday, Sunday, Tuesday and Wednesday.

Up to 12 inches of rain below 8,500 feet is expected, and massive amounts of snow — up to 6 feet — above that elevation. A fourth, colder storm two days behind will drop yet more heavy snow.

“It’s a once-in-10-year event,” said Zach Tolby, a meteorologist with the National Weather Service in Reno. “It’s the strongest storm we’ve seen in a long time, the kind of setup we look for to get significant flooding.”

Several feet of snow were forecast for parts of the West as a vast, record-setting band of winter weather swept across the region, freezing many cities, inundating others with floods and spurring authorities to warn of avalanches.

Winter storm warnings were in effect across much of the western third of the country early Thursday, from California to Colorado and Wyoming, including all of Utah's Salt Lake Valley.

Up to five feet of snow was predicted for the Sierra Mountain range, ahead of another winter storm this weekend that will bring several more feet of snow and raise the flood threat to central California.

One forecaster said parts of the range could see "enormous snow totals" of 10-15 feet or more thanks to a series of "atmospheric rivers," narrow streams of concentrated moisture in the sky, that are expected to wash over the West into early next week.

"We are not done yet," warned NBC forecaster Bill Karins, predicting "epic" snow totals in the Sierra range. "The mountain ranges in Utah and Colorado will also see significant snow [during Thursday]," he said.

However, the huge amounts of rain and snow could put a significant dent in California's five-year drought.

As of Thursday, San Francisco was at about 130 percent of the historic average rainfall for this time of year and Sacramento was at about 160 percent. Also, there are some communities further north that have seen 170 percent more than normal precipitation for this time of year.

In fact, there's been so much rain that federal and state water projects this week have been conducting controlled releases of water from major reservoirs to make room for the upcoming storm flows. Releases have been done at Folsom Reservoir near Sacramento and at Shasta Reservoir north of Redding, California.

Shasta, the state's largest surface reservoir, this week held 118 percent of its historical average while a year ago it was just 50 percent of its average.

"We're not by any means out of drought conditions," said Thomas. "You could say we're doing better."

Indeed, the latest U.S. Drought Monitor released Thursday shows large swaths of the north, including portions of San Francisco Bay area, no longer suffering from drought. A year ago portions of the Bay region were still considered in severe drought. Overall, 38 percent of California is currently in what the monitor calls "extreme" or "exceptional drought" while that number a year ago was almost 70 percent.

It's a different story further south in Central and Southern California. Portions of Southern California, including Los Angeles and San Diego, have received above average rainfall this season but remain under some of the Drought Monitor's worst drought conditions.

As of Thursday, downtown LA was about 140 percent more than normal rainfall for this time of year. LA has already received more than double the amount of rainfall it received last year at this point.

"This is a great start but we've seen years where we got a fair amount of precipitation through the end of December then it was almost like nature turned off the spigot," said Devon Upadhyay, manager of the water resource management group at the Metropolitan Water District of Southern California. The agency is a large water wholesaler serving about 19 million people in six counties.

Bay Area forecast: Series of storms on the way



The Bay Area’s respite from the rain is expected to end Wednesday when the first in a series of storms delivers more wet stuff to the region.

The first system is expected to arrive Wednesday afternoon or evening [they got that wrong; it's been raining steadily since early this morning] and move south through the region, delivering heavy rain for three to six hours, [it's already been a lot longer than six hours, and it hasn't been a windy as they predicted, so its moving through more slowly] Walbrun said. Predicted rainfall amounts range from about a half-inch to 1.5 inches.

The second system is predicted to impact the Bay Area on Thursday night into Friday morning, Walbrun said. The system, which does not have as much moisture as the first storm, will be coming from the Pacific Northwest and has a “lot more cold air” associated with it.

The third system is expected to arrive Sunday morning and could have more substantial rain, Walbrun said.

Overall, the three storm systems could deliver three to five inches of rain to the coastal hills and two to four inches to cities throughout the Bay Area, Walbrun said.

Add those totals to the rain the Bay Area received earlier this month and “we’re looking at a wet January” with a “lot of rain across most of California.” Santa Rosa has already received 11.67 inches of rain this month.

The January storms have sent rainfall totals across the Bay Area surging above normal for this time of year. Since the rainfall season began on Oct. 1, San Francisco has recorded 14.63 inches (132 percent of normal), Oakland 13.10 inches (133 percent), San Jose 7.43 inches (113 percent) and Santa Rosa 30.09 inches (168 percent).

The storms are also expected to bring more snow to the Sierra Nevada, where the snowpack level is currently at a staggering 163 percent of normal. Snowpack in the Sierra Nevada, which peaks on April 1, has finished below its annual average each of the past five years.

Once the third system clears out next Monday or Tuesday, early indications are that the Bay Area will dry out for the rest of the month, Walbrun said.

The Eastern Sierras and much of northern California area about to get hit with 3 successive storms over the next few days. Round 1 is expected to arrive today, lasting through Thursday. Then, round 2 arrives on Friday and sticks around throughout the day into early Saturday. Finally, round 3 arrives on Sunday and lasts through Monday.

4 to 7 FEET of snow is possible in the Sierras through Monday.

NOAA has issued a Winter Storm Warning calling for 8-24″ of snow in Tahoe today and tomorrow.

California is going to experience a lot of precipitation throughout the state over the next 7 days.

The storm will be relatively light in the morning, then intensity will increase in the late afternoon, making the evening commute relatively wet and windy today.

Storm 1 Sierra Snowfall: 8 to 24″ Wednesday-Thursday

* SNOW ACCUMULATIONS...8 TO 15 INCHES OF SNOW POSSIBLE ABOVE 4500 FEET, WITH OVER
TWO FEET POSSIBLE ALONG THE HIGHER PEAKS.

Storm 2 Sierra Snowfall: Up to 24″ Friday-Saturday

This round of storms will arrive Friday and persist into the day Saturday, dropping large snowfall totals on much of the sierra. This storm will have relatively low snow levels, all the way down to 2000 ft.

Storm 3 Sierra Snowfall: Up to 30″ Sunday-Monday

This storm will move into the area Sunday and persist into Monday, leaving large amounts of snow throughout the Sierras. Along with relatively low snow levels that will drop down to 3,500 ft.


These three storms are expected to drop continuous snowfall on the sierras through Monday.

Above average precipitation and below average temperatures over the next 6-10 days should be the perfect combination for some blower powder in California.

Mudslides and landslides and flooding, right?

Bicycle Bill wrote:What happens in the spring when that snowpack starts to melt?  Not all that melt water is going to funnel neatly into the depleted lakes and reservoirs, especially after last season's fires depleted what little ground cover there was.
Mudslides and landslides and flooding, right?