River Flood Warning 13, NWS Reno, NV

099 
WGUS85 KREV 121816
FLSREV
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE RENO, NV 
1016 AM PST THU JAN 12 2017
   

...The flood warning continues for the following rivers in 
California...
 
  Middle Fork Feather River Near Portola affecting Plumas COUNTY

For the Middle Fork Feather River...including Portola...
Minor flooding is occurring and is expected to continue.

Additional rainfall from the past storm has resulted in a rise on the 
Middle Fork Feather River with minor flooding expected to continue
this morning. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive cars through flooded areas as rushing water 
can easily sweep a car away...

The next forecast update for these locations will be issued at about
3 pm PST.

&&

CAC063-131900-
/O.EXT.KREV.FL.W.0013.000000T0000Z-170113T1900Z/
/MFTC1.1.ER.170112T0915Z.170112T2300Z.170113T1200Z.UU/
1016 AM PST THU JAN 12 2017

The Flood Warning continues for
  The Middle Fork Feather River Near Portola.
* UNTIL FRIDAY MORNING.
* At  9:30 AM Thursday the stage was 8.9 feet.
* Flood stage is 8.5 feet.
* Forecast...The river will continue rising to near 9.0 feet by early 
  this afternoon. The river will fall below flood stage early Friday morning.
* Impact...At 9.0 feet...Minor flooding of lowlands...rural roads...
  agricultural areas and some structures between Beckwourth and 
  Sloat...including Portola.  Portion of CA Hwy 89 near Clio 
  begins to flood. About 4800 cfs. Like flood of March 17 2011.

&&

LAT...LON 3988 12071 3983 12038 3981 12039 3972 12058 3985 12072


$$

Area Forecast Discussion
National Weather Service Reno NV
254 PM PST Wed Jan 11 2017

.SYNOPSIS...

Unsettled weather continues through Thursday night with snow
levels lowering to valley floors. Additional snow accumulations
are likely Thursday and Thursday Night especially from Interstate
80 southward.

&&

.SHORT TERM...

The Sierra is digging out of yesterday and last night's blizzard,
with many locations reporting impressive amounts of snow in the
last 24 hours. Many locations around Tahoe and the rest of the
Sierra have seen several feet of snow in the last couple days,
with a few mountain locations reporting up to 8-11 feet of snow
above 7000 feet. Interstate 80 is finally open again this
afternoon, now that crews have gotten a chance to clear off the
many many miles of snow covered interstate. As of this writing,
there are still closures on Mount Rose Highway, Highway 89 around
DL Bliss and Emerald Bay, as well as Highway 88 over Carson Pass.
Even some of the foothill locations around Galena and Virginia
City Highlands have received over a foot of snow last night.

A few areas are still seeing minor flooding from last nights rain
below 5000 feet, including the lower reaches of the Truckee River
from Derby Dam to Nixon and the Carson River from Dayton to Fort
Churchill. Only minor impacts are expected in these areas,
including flooding of low land areas.

Snow showers will continue in the Sierra through tonight, with
moist, unstable flow over the Sierra, although accumulations for
tonight will be minimal except for mainly right along the Sierra
Crest. Mono County will see an increase in snow tonight,
especially for areas west of Highway 395 as another area low
pressure moves into California.

One last compact and dynamic area of low pressure will move into
the region Thursday through Thursday night bringing another round
of snow to the Sierra and western NV. The trajectory of this low
will create a surface low over Central NV, typical of our Tonopah
Low patterns. These Tonopah Lows typically cause good surface
convergence and banding of snow with heavy accumulations possible
within localized areas. Snow levels will drop to all valley
floors tonight. With the latest model simulations, the highest
chances of heavy snow will be roughly between Carson City to
Yerington, to Hawthorne and over to the Highway 395 corridor in
Mono County. Snow totals of 2-5 inches are possible in those
heaviest bands, with up to a couple inches north of Highway 50 in
western NV, including Fallon, Reno, and Sparks. In the eastern
Sierra of Mono County and Tahoe Basin, we can expect to see
another 4-8 inches of snow, with up to a foot or more above 7000
feet. Expect this snow to push in early Thursday morning,
affecting the Thursday morning commute and potentially the
Thursday evening commute as well.

By Friday, low pressure exits the region with a few light snow
showers lingering around for areas south of Highway 50. The region
will likely see it's first dry day in a long time, although
temperatures will remain below normal with highs in the 30s and
upper 20s. Hoon

.LONG TERM...Saturday into next week...
After a brief, but well-deserved, break in the weather this weekend
we will be prepping for another atmospheric river event next week.

Friday through Tuesday appear to be relatively quiet weather days,
which will be a great time to clear out snow, reestablish supplies,
and also recover a bit from the past week's storm punches.
Inversions and poor mixing will be likely this weekend in the
valleys with temperatures near to slightly below average. Mountain
temperatures will be cool this weekend and warm for Monday and
Tuesday. Although the weather will be a significant improvement over
the past week, there will likely still be road and mountain
conditions that will need to be monitored closely, i.e. snowy, icy
roads and the potential for avalanches due to all the new snowfall.

Atmospheric river tools are still showing the potential for another
AR events by midweek next week. Although it is about a week away, we
are recommending to emergency management officials as well as county
and city authorities, that if you have flood mitigation in place
that you should leave them in place for the next 1-2 weeks. This
next system for Wednesday appears to have snow levels around 8000
feet with the potential for another round of heavy rains and gusty
winds.

We have high confidence in this active pattern developing, but
confidence is only low-medium on snow levels and low on how intense
the precipitation will be. That being said, any precipitation in the
form of rain below 7000 feet will likely cause more flooding
concerns as we recover from this past system, so we urge you to keep
any flood mitigation in place that you already have established.
Edan
&&

.AVIATION...

A partial break in the weather this afternoon will end later this
evening when a shortwave brings a return to IFR conditions at Sierra
terminals...probably with worsening conditions by 08z. This
shortwave will bring snow levels down to valley floors with snow
spreading across western NV early tomorrow morning. Snow rates will
be heavier south of Reno. Expect runway accumulations of 1 to 2
inches at KRNO and 2 to 5 inches at KCXP.

Sporadic gusts up to 30 kts are possible at terminals through this
evening. Winds will then lighten overnight with speeds at terminals
generally at 10 kts or less for tomorrow and Friday. JCM

&&

.REV Watches/Warnings/Advisories...
NV...Winter Storm Warning until 10 PM PST Thursday NVZ002.

     Winter Weather Advisory from 4 AM Thursday to 4 AM PST Friday
     NVZ001-004.

     Winter Weather Advisory from 4 AM to 10 PM PST Thursday NVZ003.

CA...Winter Storm Warning until 4 PM PST Thursday CAZ071.

     Winter Storm Warning until 4 AM PST Friday CAZ073.

     Winter Storm Warning until 10 PM PST Thursday CAZ072.

&&

For more information from the National Weather Service visit...
http://weather.gov/reno