Winter Storm Warning 4, NWS Sacramento, CA

085 
WWUS46 KSTO 172137
WSWSTO

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SACRAMENTO CA
137 PM PST SUN JAN 17 2016

...MORE SNOW AND WIND THROUGH TONIGHT ABOVE 6500 FEET...

.A STORM SYSTEM WILL BRING MODERATE TO HEAVY SNOW AND WIND TO THE
SIERRA THROUGH. TRAVEL DIFFICULTIES OVER THE SIERRA RANGE WILL
WORSEN TONIGHT SO CARRY TIRE CHAINS AND EXTRA SUPPLIES.

CAZ069-181200-
/O.CON.KSTO.WS.W.0004.160117T2200Z-160118T1800Z/
WEST SLOPE NORTHERN SIERRA NEVADA-
INCLUDING THE CITY OF...BLUE CANYON
137 PM PST SUN JAN 17 2016

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST
MONDAY...

* MAIN IMPACT...SLIPPERY SNOW COVERED ROADS WITH WINDY 
  CONDITIONS AND TRAVEL DIFFICULTIES. POOR VISIBILITY IN PERIODS 
  OF MODERATE TO HEAVY SNOW AND BLOWING SNOW. 

* TIMING...HEAVIEST SNOW WILL BEGIN OVER LASSEN PARK THIS 
  AFTERNOON AND SPREAD SOUTHWARD OVER SIERRA THIS EVENING. 

* SNOW ACCUMULATIONS...5 TO 10 INCHES ABOVE 6500 FEET WITH HIGHER
  AMOUNTS OVER THE HIGHER PEAKS LIKE LASSEN PEAK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW...
SLEET...AND ICE ARE EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO
POSSIBLE.  THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

&&

$$

403 
WWUS46 KSTO 180518
WSWSTO

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SACRAMENTO CA
918 PM PST SUN JAN 17 2016

...MORE SNOW AND WIND THROUGH MONDAY MORNING ABOVE 6000 FEET...

.A STORM SYSTEM WILL BRING MODERATE TO HEAVY SNOW AND WIND TO THE
SIERRA THROUGH MONDAY MORNING. TRAVEL DIFFICULTIES OVER THE
SIERRA RANGE WILL WORSEN TONIGHT SO CARRY TIRE CHAINS AND EXTRA
SUPPLIES.

CAZ069-181800-
/O.CON.KSTO.WS.W.0004.000000T0000Z-160118T1800Z/
WEST SLOPE NORTHERN SIERRA NEVADA-
INCLUDING THE CITY OF...BLUE CANYON
918 PM PST SUN JAN 17 2016

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST
MONDAY...

* MAIN IMPACT...SLIPPERY SNOW COVERED ROADS WITH WINDY 
  CONDITIONS AND TRAVEL DIFFICULTIES. POOR VISIBILITY IN PERIODS 
  OF MODERATE TO HEAVY SNOW AND BLOWING SNOW. 

* TIMING...HEAVY SNOW WILL CONTINUE OVERNIGHT.

* SNOW ACCUMULATIONS...6 TO 12 INCHES ABOVE 6000 FEET WITH HIGHER
  AMOUNTS OVER THE HIGHER PEAKS LIKE LASSEN PEAK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW...
SLEET...AND ICE ARE EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO
POSSIBLE.  THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

&&

$$

807 
WWUS46 KSTO 181733
WSWSTO

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SACRAMENTO CA
933 AM PST MON JAN 18 2016

CAZ069-181845-
/O.CAN.KSTO.WS.W.0004.000000T0000Z-160118T1800Z/
WEST SLOPE NORTHERN SIERRA NEVADA-
INCLUDING THE CITY OF...BLUE CANYON
933 AM PST MON JAN 18 2016

...WINTER STORM WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS CANCELLED THE
WINTER STORM WARNING. 

HEAVY SNOW HAS ENDED ACROSS THE SIERRA NEVADA. SCATTERED SNOW
SHOWERS ARE LIKELY TO CONTINUE THROUGH THE DAY, WITH AN INCH OR
TWO OF SNOW ACCUMULATION POSSIBLE ABOVE 6000 FEET.

$$

DANG

Area Forecast Discussion
National Weather Service Sacramento CA
1015 PM PST SAT JAN 16 2016

.SYNOPSIS...
WET SYSTEM MOVING IN SUNDAY THROUGH EARLY MONDAY. SOME SMALL
SCALE AND/OR BURN SCAR FLOODING COULD OCCUR DURING THIS TIME.
EXPECT PERIODS OF PRECIPITATION THROUGH NEXT WEEK.

&&

.DISCUSSION...
Impressive moisture plume coming into view on satellite just off
the west coast. 00z model runs and short term HRRR all trending a
few hours slower with the system...but also wetter as they have
the heavier band stalling out into Monday morning. Heaviest
rain band will move into the north valley around 5am and sag
south to the southern valley by 7pm Sunday. Numerous showers will
develop ahead of this band and should begin over the north valley
after midnight and spread south Sunday morning.

In the near term, isolated areas of fog have developed especially
over the delta where KSUU and KVCB have occasionally went under a
mile. Not expecting this to last through the night...as cloud
cover and mixing with incoming system should improve conditions.

&&

.PREVIOUS DISCUSSION...
A series of storms will move through the region through Tuesday.
The current system is exiting the region with shower chances
continuing into the evening. Snow levels have been risen up to
around 7500 feet and will remain high through Tuesday but may dip
at times below major pass levels of US-50 and I-80. I have
modified the flash flood watch period to when the heavier rain is
expected to move through Lake County for Sunday afternoon and
evening. Timing of the later system on Tuesday may change a
little.

In the shorter term the NAM and HRRR models are indicating showers
enhancing around mid afternoon over the Southern Sacramento
Valley and Western Slopes of the Sierra Nevada. Showers should
taper some this evening then rain may start for places around I-80
and to the north later tonight and Sunday morning. The heaviest
rainfall is expected Sunday afternoon and evening. Sunday evening
snow levels look like they may lower below major Sierra pass
levels and have some impact on travel.

&&

.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)

Unsettled weather pattern will continue through next week as
several storms move into NorCal from the Pacific. Forecast timing
will likely fluctuate over the next several runs under this
progressive pattern, but confidence is high in both a midweek and
late-week storm over the region. Snow levels will generally remain
around 5000-7000 feet before lowering next weekend. Temperatures
will be close to average for mid-January.

Dang

&&

.AVIATION...

Wly flow alf as upr rdg movs thru tngt...bckg to SWly Sun as nxt
Pac fntl sys movs into Intr NorCal. For Cstl/Shasta mtns and
Cntrl Vly...lcl MVFR/IFR bcmg wdsprd MVFR with areas IFR aft 12z
Sun. Ovr Wrn Plumas/Siernev lcl MVFR bcmg wdsprd MVFR/IFR with lcl
LIFR aft 17z Sun. Sn lvls genly aoa 055 msl. Lcl SEly sfc wnd gsts
to 30 kts Sun with SWly sfc wnd gsts to 40 kts poss ovr hyr mtn
trrn.

&&

.STO Watches/Warnings/Advisories...
Flash Flood Watch from Sunday afternoon through Sunday evening
for Clear Lake/Southern Lake County-Mountains Southwestern
Shasta County to Northern Lake County.

&&