Flash Flood Warning 11, NWS Sacramento, CA

011 
WGUS76 KSTO 061148
FFSSTO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
348 AM PST SAT DEC 6 2014

CAC103-061156-
/O.CAN.KSTO.FF.W.0011.000000T0000Z-141206T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TEHAMA CA-
348 AM PST SAT DEC 6 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL TEHAMA
COUNTY...

LOCAL LAW ENFORCEMENT HAS REPORTED THAT ALL ROADS AND HIGHWAYS HAVE 
BEEN REOPENED. 

RAINFALL HAS ABATED IN THE AREA...BUT SECONDARY ROADS AND LOW SPOTS 
MAY STILL HAVE LOCAL FLOODING FOR THE NEXT FEW HOURS.

LAT...LON 4033 12236 4033 12213 4015 12213 4015 12236

$$

DANG/DFR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
1014 PM PST Fri Dec 5 2014

.Synopsis...
Pacific frontal system will bring rain and high elevation snow
this afternoon into Saturday. The next system moves through Sunday
afternoon into Monday bringing precipitation...mainly north of
Interstate 80. A windy and more moist system moves in Thursday.

&&

.Discussion... Bands the showers continue to track across NorCal
this evening with the best coverage over the northern and central
Sac valley. The heaviest rainfall amounts have been over northwest
Shasta county where several RAWS sites have received around 1.50
inches. Activity will continue overnight...but gradually diminish
towards morning. Winds have also been gusty over the north Sac
valley with Redding gusting to 32 kts. The winds will diminish
over the next couple of hours as frontal system passes to the
east. Snow levels remain high currently above 7000 feet. forecast
is on track and no evening update will be needed.

.Previous Discussion...
Scattered showers this afternoon...mainly north of Interstate 80
with moisture and instability and warm air advection ahead of the
system coming in tonight into Saturday. Temperatures have warmed
up in the 60s in the Valley and Delta areas this afternoon and in
the mid 30s to 40s in the mountains. These temperatures are near
to several degrees above normal. The records are a little higher
than yesterday with a records in the low 70s in the Sacramento and
Stockton areas.

Precipitation will become more widespread this evening ahead of
the cold front. This may bring slick roads for the evening
commute. Thunderstorms are possible this evening with some
instability. Southerly winds will also increase ahead of the
front bringing breezy conditions late this afternoon into tonight.
The winds will blow down leaves that can clog drains.
Precipitation may continue into Saturday morning with lingering
showers possible over the mountains in the afternoon. Snow levels
around 7000 ft with a few inches possible over the highest
elevations and several inches over the top of Mt. Lassen.
Precipitation amounts into Saturday are forecast to be around a
half an inch in the Sacramento Valley and a quarter of an inch or
less in the Northern San Joaquin Valley and generally around a
half an inch to 1.5 inches over the foothills and mountains with
the highest amounts expected in Butte and Western Plumas Counties
and Shasta County. Weak ridging between systems late Saturday into
early Sunday for a break in precipitation most locations except
possibly along the Coastal range and western Shasta County. Areas
of Valley fog may develop on Sunday morning with lingering
moisture. Another system moves into the area Sunday afternoon into
Monday with the majority of the precipitation along and north of
the Interstate 80 corridor. Precipitation amounts generally a
quarter of an inch or less in the Sacramento Valley and around an
inch in the mountains.

.Extended Discussion (Tuesday through Friday)

Relatively dry weather for start of extended period as more zonal
flow arrives. A shortwave moving into the Pac NW will bring a
small chance for some showers across northern portions of the area
Tuesday into Wednesday but most areas will remain dry. The next
storm system will arrive late week (Thu/Fri time frame) as large
low rotates SE toward the coast. As advertised previously, this
system has the potential to be strong with numerous impacts. GEFS
mean MSLP showing min percentile with PWATs around 1 inch in the 99th
percentile. Timing and details still uncertain this far out with
a bit of model disagreement. It will definitely be one to watch
with the possibility of moderate-heavy precip, lower snow levels
than this past storm, and gusty winds. CEO

&&

.Aviation...

VFR/MVFR conditions with locally reduced ceilings/vis into
Saturday morning as showers move through. gradually improving
conditions through the day on Saturday.

Southeast winds up to 25 kt will decrease to 10-15 kt towards
morning.

&&

.STO Watches/Warnings/Advisories...
None.
&&