Winter Storm Watch 10, NWS Reno, NV

429 
WWUS45 KREV 141810
WSWREV

URGENT - WINTER WEATHER MESSAGE
National Weather Service Reno NV
1010 AM PST Tue Dec 14 2021

CAZ071-150000-
/O.CAN.KREV.WS.W.0003.000000T0000Z-211215T0000Z/
/O.CON.KREV.WS.A.0010.211216T0000Z-211216T2000Z/
Lassen-Eastern Plumas-Eastern Sierra Counties-
Including the cities of Portola and Susanville
1010 AM PST Tue Dec 14 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING...
...WINTER STORM WARNING FOR TODAY IS CANCELLED...

* CHANGES...Additional light snow showers are likely throughout
  the day into early evening, however the risk of heavy snows has
  ended for today. Expect slick roads going into the evening 
  commute as temperatures drop, especially after sunset.

* WHAT...Heavy snow possible with the next storm starting
  Wednesday afternoon. Total snow accumulations of 2 to 4 inches,
  except 3 to 11 inches west of highway 395 possible.

* WHERE...Lassen-Eastern Plumas-Eastern Sierra Counties.

* WHEN...From Wednesday afternoon through Thursday morning.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions could impact the morning or evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Now is the time to prepare an emergency kit for your home and
car. If traveling consider alternate plans, remember to carry
tire chains, extra food, water and clothing. Once the storm
arrives, travel may be difficult or impossible for an extended
period of time.

&&

$$

NVZ003-141915-
/O.EXP.KREV.WS.W.0003.000000T0000Z-211214T1800Z/
Greater Reno-Carson City-Minden Area-
1010 AM PST Tue Dec 14 2021

...WINTER STORM WARNING HAS EXPIRED...

Additional light snow showers are likely throughout the day into
early evening, however the risk of heavy snows has ended for
Western Nevada. Expect slick roads going into the evening commute
as temperatures drop, especially after sunset.

$$

CAZ070-NVZ001-004-005-141915-
/O.EXP.KREV.WW.Y.0021.000000T0000Z-211214T1800Z/
Surprise Valley California-Mineral and Southern Lyon Counties-
Western Nevada Basin and Range including Pyramid Lake-
Northern Washoe County-
1010 AM PST Tue Dec 14 2021

...WINTER WEATHER ADVISORY HAS EXPIRED...

Additional light snow showers are likely throughout the day into
early evening, however the risk of heavy snows has ended. Expect 
slick roads going into the evening commute as temperatures drop, 
especially after sunset.

$$

CAZ072-NVZ002-150000-
/O.CON.KREV.WS.W.0003.000000T0000Z-211215T0600Z/
/O.CON.KREV.WS.A.0010.211216T0000Z-211216T2000Z/
Greater Lake Tahoe Area-
Including the cities of South Lake Tahoe, Truckee, Stateline, 
and Incline Village
1010 AM PST Tue Dec 14 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING...
...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING...

* WHAT...Additional snowfall accumulations of 1 to 4 inches today.
  For the Winter Storm Watch, heavy snow possible. Total snow
  accumulations of 5 to 15 inches, except 10 to 20 inches above
  7000 feet possible. Wind gusts to 40 mph with Sierra ridges
  gusting 80 mph.

* WHERE...Greater Lake Tahoe Area.

* WHEN...For the Winter Storm Warning, until 10 PM PST this 
  evening. For the Winter Storm Watch, from Wednesday afternoon 
  through Thursday morning.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions could impact the morning or evening commutes. Very 
  strong winds could cause extensive tree damage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Now is the time to prepare an emergency kit for your home and 
car. If traveling consider alternate plans, remember to carry tire
chains, extra food, water and clothing. Once the storm arrives, 
travel may be difficult or impossible for an extended period of 
time.

The latest road conditions can be obtained by calling 5 1 1.

&&

$$

CAZ073-150000-
/O.CON.KREV.WS.W.0003.000000T0000Z-211215T0600Z/
/O.CON.KREV.WS.A.0010.211216T0600Z-211216T2000Z/
Mono County-
Including the cities of Bridgeport, Coleville, and Mammoth Lakes
1010 AM PST Tue Dec 14 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING...
...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY EVENING
THROUGH THURSDAY MORNING...

* WHAT...Additional snowfall accumulations of 3 to 6 inches along
  Highway 395 and 8 to 12 inches near Mammoth Lakes. For the 
  Winter Storm Watch, heavy snow possible. Total snow 
  accumulations 6 to 12 inches, mainly near and west of Highway 
  395. Wind gusts to 45 mph with Sierra ridges gusting over 75 
  mph.

* WHERE...Mono County.

* WHEN...For the Winter Storm Warning, until 10 PM PST this 
  evening. For the Winter Storm Watch, from Wednesday evening 
  through Thursday morning.

* IMPACTS...Travel could be very difficult. The hazardous
  conditions could impact the morning or evening commutes. Strong
  winds could cause extensive tree damage and possible power
  outages. The cold wind chills in higher elevations as low as 25
  below zero could cause frostbite on exposed skin in as little 
  as 30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Now is the time to prepare an emergency kit for your home and
car. If traveling consider alternate plans, remember to carry
tire chains, extra food, water and clothing. Once the storm
arrives, travel may be difficult or impossible for an extended
period of time.

The latest road conditions can be obtained by calling 5 1 1.

&&

$$

http://www.weather.gov/reno

992 
WWUS45 KREV 142141
WSWREV

URGENT - WINTER WEATHER MESSAGE
National Weather Service Reno NV
141 PM PST Tue Dec 14 2021

CAZ072-NVZ002-160000-
/O.CAN.KREV.WS.W.0003.000000T0000Z-211215T0600Z/
/O.UPG.KREV.WS.A.0010.211216T0000Z-211216T2000Z/
/O.NEW.KREV.WS.W.0004.211215T2100Z-211216T1800Z/
Greater Lake Tahoe Area-
Including the cities of South Lake Tahoe, Truckee, Stateline, and
Incline Village
141 PM PST Tue Dec 14 2021

...WINTER STORM WARNING IN EFFECT FROM 1 PM WEDNESDAY TO 10 AM
PST THURSDAY...
...WINTER STORM WARNING FOR TODAY IS CANCELLED...

* WHAT...Periods of moderate to heavy snow and strong winds. Total
  snow accumulations of 6 to 12 inches for the Truckee, Tahoe
  City, and South Lake Tahoe areas, with 10 to 20 inches for 
  areas above 7000 feet including major passes. Winds gusting 30 
  to 40 mph, with ridges gusting to 80 mph.

* WHERE...Greater Lake Tahoe Area.

* WHEN...From 1 PM Wednesday to 10 AM PST Thursday. Heaviest
  snowfall rates and strongest winds between 4 PM Wednesday and 4
  AM Thursday.

* IMPACTS...Travel could be very difficult to nearly impossible.
  The hazardous conditions will impact the Wednesday evening and
  Thursday morning commutes. Delays likely, road closures
  possible. Very strong winds could cause extensive tree damage
  and even power outages. Periods of low visibility in blowing
  snow likely.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Avoid travel if possible, you could be stuck in your vehicle for 
many hours. If you must travel, prepare for long delays and carry 
an emergency kit with extra food, water and clothing. If you stay 
home, have a backup plan in case of power outages.

The latest road conditions can be obtained by calling 5 1 1.

&&

$$

CAZ073-160000-
/O.CAN.KREV.WS.W.0003.000000T0000Z-211215T0600Z/
/O.UPG.KREV.WS.A.0010.211216T0600Z-211216T2000Z/
/O.NEW.KREV.WW.Y.0022.211216T0300Z-211216T2100Z/
Mono County-
Including the cities of Bridgeport, Coleville, and Mammoth 
Lakes
141 PM PST Tue Dec 14 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 7 PM WEDNESDAY TO 1 PM
PST THURSDAY...
...WINTER STORM WARNING FOR TODAY IS CANCELLED...

* WHAT...Periods of moderate to heavy snow expected. Total snow
  accumulations of 3 to 5 inches along Highway 395, 6 to 12 inches
  west of Highway 395 including Mammoth Lakes, and up to 1 inch in
  the Chalfant Valley. Winds gusting 30 to 40 mph, with Sierra 
  ridges gusting to 80 mph.

* WHERE...Mono County.

* WHEN...From 7 PM Wednesday to 1 PM PST Thursday. Heaviest
  snowfall rates 10 PM Wednesday to 8 AM Thursday.

* IMPACTS...Travel could be very difficult across the Eastern
  Sierra. The hazardous conditions will impact the Thursday
  morning commute. Delays likely, road closures possible. Very
  strong winds could cause tree damage and even power outages.
  Periods of low visibility in blowing snow possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Even light snowfall causes major travel delays, especially during
periods of high traffic volume. Be sure to allow extra time to
reach your destination. Leave extra space between vehicles since
it takes longer to stop on slick roadways. 

The latest road conditions can be obtained by calling 5 1 1.

&&

$$

CAZ071-160000-
/O.UPG.KREV.WS.A.0010.211216T0000Z-211216T2000Z/
/O.NEW.KREV.WW.Y.0022.211215T2100Z-211216T1800Z/
Lassen-Eastern Plumas-Eastern Sierra Counties-
Including the cities of Portola and Susanville
141 PM PST Tue Dec 14 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 PM WEDNESDAY TO 10 AM
PST THURSDAY...

* WHAT...Periods of moderate to heavy snow. Total snow
  accumulations of 2 to 4 inches along Highway 395 including
  Susanville, with 6 to 12 inches west of Highway 395 including
  Portola and near Lassen National Park. Wind gusts to 35 mph.

* WHERE...Lassen-Eastern Plumas-Eastern Sierra Counties.

* WHEN...From 1 PM Wednesday to 10 AM PST Thursday. Heaviest
  snowfall rates between 4 PM and 10 PM Wednesday.

* IMPACTS...Travel could be difficult. Plan for delays, possibly 
  significant. The hazardous conditions could impact the Wednesday
  evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Even light snowfall causes major travel delays, especially during
periods of high traffic volume. Be sure to allow extra time to
reach your destination. Leave extra space between vehicles since
it takes longer to stop on slick roadways. 

The latest road conditions can be obtained by calling 5 1 1.

&&

$$

CAZ070-NVZ005-160000-
/O.NEW.KREV.WW.Y.0022.211215T2100Z-211216T1800Z/
Surprise Valley California-Northern Washoe County-
Including the cities of Cedarville, Fort Bidwell, Empire, 
and Gerlach
141 PM PST Tue Dec 14 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 PM WEDNESDAY TO 10 AM
PST THURSDAY...

* WHAT...Periods of light to moderate expected. Total snow 
  accumulations of 1 to 4 inches, including Gerlach and 
  Cedarville.

* WHERE...Surprise Valley California and Northern Washoe County.

* WHEN...From 1 PM Wednesday to 10 AM PST Thursday. Heaviest
  snowfall rates between 4 PM and 10 PM Wednesday.

* IMPACTS...Travel could be difficult. Plan for delays, possibly 
  significant. The hazardous conditions could impact the Wednesday
  evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Even light snowfall causes major travel delays, especially during
periods of high traffic volume. Be sure to allow extra time to
reach your destination. Leave extra space between vehicles since
it takes longer to stop on slick roadways. 

The latest road conditions can be obtained by calling 5 1 1.

&&

$$

NVZ003-160000-
/O.NEW.KREV.WW.Y.0022.211216T0000Z-211216T1800Z/
Greater Reno-Carson City-Minden Area-
Including the cities of Sparks, Verdi, Gardnerville, 
and Virginia City
141 PM PST Tue Dec 14 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM WEDNESDAY TO 10 AM
PST THURSDAY...

* WHAT...Periods of light to moderate snow expected. Total snow
  accumulations of 0 to 2 inches for valleys including Reno,
  Carson City, and Minden. Accumulations of 2 to 5 inches for
  foothill areas including Virginia City, Reno North Valleys, and
  west of Carson City. Winds gusting as high as 45 mph.

* WHERE...Greater Reno-Carson City-Minden Area.

* WHEN...From 4 PM Wednesday to 10 AM PST Thursday. Heaviest snow
  rates between 9 PM Wednesday and 4 AM Thursday.

* IMPACTS...Travel could be difficult due to snow and wind. The 
  hazardous conditions could impact the Thursday morning commute. 
  Strong winds could also result in branches falling and localized
  power outages.

* ADDITIONAL DETAILS...Snow may mix with or change to rain in
  valleys, which may significantly limit how much snowfall
  accumulates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Even light snowfall causes major travel delays, especially during
periods of high traffic volume. Be sure to allow extra time to
reach your destination. Leave extra space between vehicles since
it takes longer to stop on slick roadways. 

The latest road conditions can be obtained by calling 5 1 1.

&&

$$

http://www.weather.gov/reno

Area Forecast Discussion
National Weather Service Reno NV
331 AM PST Tue Dec 14 2021

.SYNOPSIS...

While this current winter storm will continue bringing snow and
hazardous travel conditions mainly through this morning, another
storm will bring additional snow late Wednesday into Thursday.
We should see a break from the significant storms Friday through
the weekend, but an active storm track is likely to return next
week.

&&

.SHORT TERM...through Thursday...

* First Winter Storm is exiting later today, but next storm is on
  its way late Wednesday into Thursday, with new Winter Storm
  Watches being issued this morning.

It took a while but the rain finally changed to snow across the
Reno area--at the NWS office near 5000 feet the snow began around
10:30 pm, but it wasn't until after 1:30 AM when the Reno Airport
had their changeover. That 3-hour difference showed the slow
progress of the cold front when the main storm pivoted with
southerly flow lasting through much of Monday, and highlights the
challenges of snow amount forecasts across the main cities and
foothills of far western NV.

The strongest portion of the storm will be with us through the
remainder of the morning, with snow decreasing from north to south
as the storm slowly makes its exit. Even after the snow tapers
down, travel issues and other impacts such as power outages will
take a while to clear out, especially in the Sierra where a few
feet of snow has accumulated since late Saturday night.

We'll have about one day to dig out of this storm, then the next
storm will dig in by mid-late Wednesday afternoon for northeast
CA, and across the remainder of the region Wednesday evening
through Thursday morning. While we aren't expecting blockbuster
snow totals, the impacts will be compounded when accounting for
the current storm's aftermath. We will issue Winter Storm Watches
for northeast CA and the Sierra from Tahoe southward to Mono
County, with potential for around 1 foot of additional snow around
the Tahoe basin/NE CA west of US-395/western Mono County, and up
to 2 feet in the higher elevations around the Tahoe area.

This storm is colder from start to finish, with a period of snow
also spreading across lower elevations producing generally 1-4" of
snowfall potential for northwest-far western NV, and maybe up to
1" for the US-95 corridor in west central NV. Gusty winds are
also likely to precede and accompany this snow, with gusts
generally in the 30-40 mph range and potentially stronger for the
Sierra foothills and US-395/I-580 corridor, while Sierra ridges
can expect gusts around 100 mph. For those who waited and wanted
their winter, it is here to stay for a while! MJD

.LONG TERM...Friday into early next week...

Friday into this Weekend:

* A short-wave upper level ridge will build northeastward into the
  West Coast, allowing surface high pressure to strengthen over the
  Great Basin and the Sierra Nevada Friday. Gusty northeast winds
  are expected along the Sierra crest early Friday, tapering off
  into the afternoon. Fair skies and slightly colder temperatures
  are also expected.

* Into the weekend, ensemble guidance becomes more progressive
  with the synoptic pattern than was seen in previous forecasts.
  The GEFS has come into more alignment with the EC ensemble,
  showing some flavor of trough passing southeast across the
  Pacific NW into the northern Intermountain West. Winds look to
  increase along ridges late in the afternoon Saturday through the
  early morning Sunday. Some breezier conditions will also be
  possible near the Oregon border, especially late Saturday
  afternoon. There could be a slight chance for light showers
  across northeast CA and far northwestern NV Sunday as this
  trough passes by to the north.

Active Pattern Beginning Next Week?

* The progressive synoptic pattern looks to continue next week as
  ensemble clusters are showing signs of troughs possibly impacting
  the region beginning as early as Monday with another round of
  widespread precipitation possible. Signals continue to point
  towards this progressive pattern continuing through next week,
  which would affect Christmas travel.

-Johnston

&&

.AVIATION...

An ongoing major winter storm will continue through today, with
the greatest overall impacts through this morning with multiple
hazards including (1) Wind-LLWS-Turbulence; (2) Snowfall-
obscurations-poor visibility; and (3) In-flight icing.

These impacts will decrease as winds ease and snow tapers later
today. Major snow accumulations on the paved areas of the Sierra
terminals (KTVL-KTRK-KMMH) will take a while to be cleared, so
anyone planning flights involving these sites after the weather
improves would need to check the status of those airports first.
For the western NV terminals (KRNO-KCXP-KMEV), accumulating snow
will likely continue through mid-morning.

The break in between storms will be short lived, before the next
storm brings similar widespread impacts to aviation activity
(Gusty Winds/turbulence/LLWS and snow/IFR-LIFR conditions)
Wednesday evening-Thursday morning. Additional snowfall amounts
at the Sierra sites will be noteworthy, but less extreme compared
to this current storm. MJD

&&

.REV Watches/Warnings/Advisories...
NV...Winter Weather Advisory until 10 AM PST this morning NVZ001-004.

     Winter Storm Watch from Wednesday afternoon through Thursday
     morning NVZ002.

     Winter Weather Advisory until 10 AM PST this morning NVZ005.

     Winter Storm Warning until 10 PM PST this evening NVZ002.

     Winter Storm Warning until 10 AM PST this morning NVZ003.

CA...Winter Storm Watch from Wednesday afternoon through Thursday
     morning CAZ072.

     Winter Storm Warning until 4 PM PST this afternoon CAZ071.

     Winter Storm Watch from Wednesday afternoon through Thursday
     morning CAZ071.

     Winter Weather Advisory until 10 AM PST this morning CAZ070.

     Winter Storm Warning until 10 PM PST this evening CAZ073.

     Winter Storm Watch from Wednesday evening through Thursday
     morning CAZ073.

     Winter Storm Warning until 10 PM PST this evening CAZ072.

&&

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