Winter Storm Watch 2, NWS Reno, NV

757 
WWUS45 KREV 302242
WSWREV

URGENT - WINTER WEATHER MESSAGE
National Weather Service Reno NV
242 PM PST Sat Jan 30 2021

CAZ073-010000-
/O.EXT.KREV.WS.A.0002.210202T1200Z-210203T1800Z/
Mono County-
Including the cities of Bridgeport, Coleville, and Mammoth Lakes
242 PM PST Sat Jan 30 2021

...WINTER STORM WATCH NOW IN EFFECT FROM EARLY TUESDAY MORNING
THROUGH WEDNESDAY MORNING...

* CHANGES...Delayed start time and extended end time of watch.

* WHAT...Heavy snow possible. Total snow accumulations of 2 to 4
  inches for communities along US-395, with 8 to 16 inches above
  7000 feet possible. Winds could gust to 75 mph over the higher 
  elevations.

* WHERE...Mono County.

* WHEN...From early Tuesday morning through Wednesday morning.

* IMPACTS...Travel could be very difficult. The hazardous
  conditions may impact travel Tuesday and Wednesday.

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.

&&

$$

CAZ072-NVZ002-010000-
/O.CON.KREV.WS.A.0002.210202T0000Z-210203T1200Z/
Greater Lake Tahoe Area-
Including the cities of South Lake Tahoe, Truckee, Stateline, 
and Incline Village
242 PM PST Sat Jan 30 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE MONDAY AFTERNOON
THROUGH LATE TUESDAY NIGHT...

* CHANGES...None.

* WHAT...Heavy snow possible. Total snow accumulations of 4 to 8
  inches in the Tahoe Basin, 10 to 18 inches above 7000 feet, with 
  up to 2 feet along the Sierra crest possible. Winds could gust 
  above 75 mph over the higher elevations.

* WHERE...Greater Lake Tahoe Area.

* WHEN...From late Monday afternoon through late Tuesday night.

* IMPACTS...Travel could be very difficult. The hazardous
  conditions may impact the commutes from Monday evening through 
  Tuesday evening.

* ADDITIONAL DETAILS...Winds will bring choppy conditions on 
  Lake Tahoe with wave heights of 2 to 4 feet possible.

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.

&&

$$

CAZ071-010000-
/O.CON.KREV.WS.A.0002.210202T0000Z-210203T1200Z/
Lassen-Eastern Plumas-Eastern Sierra Counties-
242 PM PST Sat Jan 30 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE MONDAY AFTERNOON
THROUGH LATE TUESDAY NIGHT ABOVE 5500 FEET...

* CHANGES...None.

* WHAT...Heavy snow possible above 5500 feet. Total snow
  accumulations of 1 to 3 inches, except 6 to 12 inches west of
  Susanville, possible. Winds could gust as high as 45 mph.

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

* WHEN...From late Monday afternoon through late Tuesday night.

* IMPACTS...Travel could be very difficult. The hazardous
  conditions may impact the commutes from Monday evening through 
  Tuesday evening.

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.

&&

$$

http://www.weather.gov/reno

950 
WWUS45 KREV 311034
WSWREV

URGENT - WINTER WEATHER MESSAGE
National Weather Service Reno NV
234 AM PST Sun Jan 31 2021

CAZ072-NVZ002-011200-
/O.EXT.KREV.WS.A.0002.210202T0600Z-210203T1200Z/
Greater Lake Tahoe Area-
Including the cities of South Lake Tahoe, Truckee, Stateline, 
and Incline Village
234 AM PST Sun Jan 31 2021

...WINTER STORM WATCH NOW IN EFFECT FROM MONDAY EVENING THROUGH
LATE TUESDAY NIGHT...

* CHANGES...Delayed start time of the watch by 6 hours and
  decreased potential snow totals. 

* WHAT...Heavy snow possible. Total snow accumulations of 3 to 7
  inches, except 8 to 18 inches above 7000 feet possible. Highest
  totals will be near and west of Highway 89. Winds could gust as
  high as 60 mph across higher elevations of the Sierra.

* WHERE...Greater Lake Tahoe Area.

* WHEN...From Monday evening through late Tuesday night.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions may impact the commutes from Monday evening through 
  Tuesday evening.

* ADDITIONAL DETAILS...Winds will bring choppy conditions on 
  Lake Tahoe with wave heights of 2 to 4 feet possible.

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.

&&

$$

CAZ071-011200-
/O.EXT.KREV.WS.A.0002.210202T0600Z-210203T1200Z/
Lassen-Eastern Plumas-Eastern Sierra Counties-
234 AM PST Sun Jan 31 2021

...WINTER STORM WATCH NOW IN EFFECT FROM MONDAY EVENING THROUGH
LATE TUESDAY NIGHT ABOVE 5500 FEET...

* CHANGES...Delayed start time of the watch by 6 hours and
  decreased potential snow totals.

* WHAT...Heavy snow possible above 5500 feet. Total snow
  accumulations of up to two inches, except 4 to 12 inches west of 
  Highway 395 possible.

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

* WHEN...From Monday evening through late Tuesday night.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions may impact the commutes from Monday evening through 
  Tuesday evening.

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.

&&

$$

CAZ073-011200-
/O.CON.KREV.WS.A.0002.210202T1200Z-210203T1800Z/
Mono County-
Including the cities of Bridgeport, Coleville, and Mammoth Lakes
234 AM PST Sun Jan 31 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE MONDAY NIGHT
THROUGH WEDNESDAY MORNING...

* CHANGES...Decreased potential snow totals.

* WHAT...Heavy snow possible. Total snow accumulations of up to
  two inches for communities along Highway 395, with 6 to 12 
  inches above 7500 feet possible. Winds could gust as high as 50 
  mph across higher elevations of the Sierra.

* WHERE...Mono County.

* WHEN...From late Monday night through Wednesday morning.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions may impact travel Tuesday and Wednesday.

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.

&&

$$

http://www.weather.gov/reno

891 
WWUS45 KREV 312207
WSWREV

URGENT - WINTER WEATHER MESSAGE
National Weather Service Reno NV
207 PM PST Sun Jan 31 2021

CAZ072-NVZ002-020000-
/O.UPG.KREV.WS.A.0002.210202T0600Z-210203T1200Z/
/O.NEW.KREV.WW.Y.0006.210202T0600Z-210203T1200Z/
Greater Lake Tahoe Area-
Including the cities of South Lake Tahoe, Truckee, Stateline, 
and Incline Village
207 PM PST Sun Jan 31 2021

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

* CHANGES...Winter Storm Watch no longer in effect. 

* WHAT...Snow expected. Total snow accumulations of 3 to 8 inches,
  except 8 to 16 inches above 7000 feet with the higher amounts 
  likely near the Sierra crest. Winds gusting as high as 80 mph 
  across higher elevations of the Sierra.

* WHERE...Greater Lake Tahoe Area.

* WHEN...From 10 PM Monday to 4 AM PST Wednesday.

* IMPACTS...Expect difficult travel conditions and poor visibility
  which will likely impact the Tuesday morning and evening 
  commutes. Snow may take longer to be cleared due to large piles 
  of existing snow from last week's storm. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Even light to moderate 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.

&&

$$

CAZ073-020000-
/O.UPG.KREV.WS.A.0002.210202T1200Z-210203T1800Z/
/O.NEW.KREV.WW.Y.0006.210202T1200Z-210203T1800Z/
Mono County-
Including the cities of Bridgeport, Coleville, and Mammoth Lakes
207 PM PST Sun Jan 31 2021

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

* CHANGES...Winter Storm Watch no longer in effect.

* WHAT...Snow expected. Total snow accumulations of 3 to 7 inches
  west of Highway 395, with up to 1 foot possible near the Sierra
  crest. Winds gusting as high as 70 mph across higher elevations
  of the Sierra.

* WHERE...Mono County.

* WHEN...From 4 AM Tuesday to 10 AM PST Wednesday.

* IMPACTS...Expect difficult travel conditions and poor visibility
  which will likely impact the Tuesday evening and Wednesday 
  morning commutes. Snow may take longer to be cleared due to 
  large piles of existing snow from last week's storm.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Even light to moderate 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.

&&

$$

CAZ071-020000-
/O.UPG.KREV.WS.A.0002.210202T0600Z-210203T1200Z/
/O.NEW.KREV.WW.Y.0006.210202T0600Z-210203T1200Z/
Lassen-Eastern Plumas-Eastern Sierra Counties-
207 PM PST Sun Jan 31 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM MONDAY TO 4 AM
PST WEDNESDAY ABOVE 5500 FEET...

* CHANGES...Winter Storm Watch no longer in effect.

* WHAT...Snow expected above 5500 feet. Total snow accumulations
  of 3 to 7 inches west of highway 395, with localized amounts up
  to 1 foot possible.

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

* WHEN...From 10 PM Monday to 4 AM PST Wednesday.

* IMPACTS...Expect difficult travel conditions for higher
  elevation roads in western Lassen County, and central Plumas and
  Sierra counties, which will likely impact the Tuesday morning 
  and evening commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Even light to moderate 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
211 PM PST Fri Jan 29 2021

.SYNOPSIS...

Quieter weather has arrived for the end of the week into the
weekend. The primary concern late tonight into Saturday will be the
potential for widespread freezing fog for valley areas. There will
also be some light snow in the Sierra this weekend before another
significant storm arrives late Monday into Tuesday next week.

&&

.SHORT TERM...

The multi-day storm is over, so when you have a moment be sure to
check out some of the storm totals listed on NWS Reno Facebook,
Twitter, or weather.gov/reno. In water news, as of midnight we have
increased the Snow Water Equivalent in the eastern Sierra from 50%
to 81% of median! Although, we still need to double the existing
snowpack to reach the median peak. Progress, not perfection folks.
So what's on the weather agenda coming up for tonight and into the
weekend?

Primary concerns for the weekend:
- Areas of dense freezing fog for the valley areas with snow
  cover. A freezing fog advisory was issued for much of the Sierra
  and western Nevada to account for this.

- Highly variable road conditions and avalanche risk due to snow.
  Please check with the Sierra Avalanche Center and/or the Eastern
  Sierra Avalanche Center if you have any backcountry recreation
  plans. If traveling, you can find the latest road information
  with CalTrans in California and NDOT in Nevada.

When it comes to freezing fog around western Nevada and
northeastern California, it can be hard to come by. With all the
recent snowfall across the valley areas and foothills, the amount
of moisture in the air along with the very stable conditions, and
clear skies overnight should allow it to form for many valley
locations late tonight into Saturday morning. It's a decent bet
that if you saw fog this morning, you will likely be dealing with
it early tomorrow as well. I for one am hoping that fog develops
and tricks my kids into sleeping in a little bit. We will see.

Other than the fog and a few light showers, this weekend should
really be nice and quiet. Again, quiet weather doesn't account for
ongoing avalanche concerns and/or road conditions. If you are
planning to go to the mountains to play, then do your homework
first. Caltrans, CHP, NDOT, and NHP have had a long week (bravo to
them) and they don't really need unprepared drivers heading up
into their areas. There are also multiple road closures still in
place for some spots in the eastern Sierra, so don't try to get up
there unless the roads are open. I am pumped about the snow too,
but let's be responsible. ;-)

Another storm is on the way for the Monday - Tuesday time frame,
but I'll let Evan fill you in on that. -Edan

.LONG TERM...The First Week of February...

We welcome the month of February with a winter storm looking to
make impacts to the region beginning on Monday and lasting through
Wednesday morning. According to current model guidance, this
potential system does not look as powerful and significant
compared to this week's system, however, at least another few feet
of snow along the Sierra Crest and up to a foot down to Lake Tahoe
level is plausible at this time.

*Winds: Monday is looking to be mainly windy with pre-frontal,
 southwest winds increasing throughout the day region-wide.
 Nothing too strong at this time as gusts across western Nevada
 are forecast to be in the 20-25 mph range and stronger along the
 Sierra, 30-50 mph by late Monday afternoon. Peak winds look to
 take place late Monday night through Tuesday coinciding with the
 passing of the trough's associated cold front. A few locations
 could decouple overnight, but for the most part winds will be
 gusty overnight into Tuesday as the front will allow sufficient
 mixing down to the valley floors. A majority of the ECMWF
 ensemble members have peak winds gusting to 45-50 mph for South
 Lake Tahoe and 30-40 mph for the Reno Airport during this time.
 Expecting Sierra ridge winds to be in the 60-80 mph range.
 Northwest winds taper on Wednesday as Sierra ridge winds continue
 to be gusty from the northeast through Thursday signaling post-
 frontal conditions.

*Precipitation: Late Monday night into all day Tuesday looks to be
 the timetable for the precipitation associated with this storm.
 Still being a few days out, but have noticed a couple of key
 differences with this system compared to this past week's system;
 a positively-tilted trough rather than a negatively-tilted one
 leads to an overall weaker system, lack of a moisture tap (i.e.
 atmospheric river), and much more progressive (it doesn't look to
 stick around for three days). However, this storm still has the
 potential to be a moderate system, just not as potent as this
 past week's. This morning's GEFS Probability of IVT tool shows
 areas just north of the Oregon border as well as coastal northern
 California seeing the best AR moisture chances with it eventually
 extending into southern California as the trough moves on shore
 late Tuesday.

Okay, that's great. So, how much snow are we getting? Most of the
precipitation should fall as the front moves through the region
late Monday night through Tuesday. As of now, snowfall projections
are as follows:

Reno-Sparks, Carson City-Minden, Susanville: 35% chance for 1-3"

Lovelock-Fallon-Hawthorne: 15% chance for up to 1"

South Lake-Truckee: 70% chance for up to 12"

Mammoth Lakes: 25% chance for over 8"

Sierra Crest: 2-4 feet

Plan on some dicey commutes, especially for the Sierra passes,
for Monday evening, Tuesday morning and evening, and Wednesday
morning of this upcoming week. Donner Pass could very likely see
another 2 feet of snow with US-395 near Mammoth Lakes seeing
another foot. The tricky part with this storm is for western
Nevada where snow levels are forecast to be off the valley floors
for the most part leading to mainly rain for this event. However,
these locations can see some accumulating snow once the front
pushes through on Tuesday.

As for temperatures next week... besides for Monday (warmer thanks
to breezy southwest flow), expect below average highs and lows
with the coldest day of the week on Wednesday as highs are
forecast to be roughly 10 degrees below normal.

With Tuesday being Groundhog Day, we shall see if winter will
continue for another six weeks. Ensembles showing the ridge
returning off the California coast possibly leading to more of a
inside-slider type pattern after Wednesday, but let's see what
Phil has to say.

-LaGuardia

&&

.AVIATION...

Winter storm system is largely over for the eastern Sierra and
western Nevada. Some aviation impacts continue today, including
widespread terrain obstruction over the Sierra, MVFR/IFR CIG/VIS
in the Sierra and icing conditions.

There will be a few lingering showers mainly for our Sierra
terminals through the weekend. Plan for freezing fog late tonight
into early Saturday for most valley locations. Quieter weather
will arrive this weekend with only some light snow in the Sierra
before another significant storm hits Monday into Tuesday next
week. -Edan

&&

.REV Watches/Warnings/Advisories...

NV...Freezing Fog Advisory from midnight tonight to 9 AM PST Saturday
     NVZ001>005.

CA...Freezing Fog Advisory from midnight tonight to 9 AM PST Saturday
     CAZ070>073.

&&

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