Winter Storm Warning 1, NWS San Diego, CA

379 
WWUS46 KSGX 092206
WSWSGX

URGENT - WINTER WEATHER MESSAGE
National Weather Service SAN DIEGO CA
206 PM PST Sun Feb 9 2020

CAZ055-100615-
/O.CON.KSGX.WS.W.0001.000000T0000Z-200211T1200Z/
San Bernardino County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear City,
Big Bear Lake, Running Springs, and Wrightwood
206 PM PST Sun Feb 9 2020

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST TUESDAY
ABOVE 4000 FEET...

* WHAT...Heavy snow expected. Plan on difficult travel 
  conditions, including during the morning commute on Monday. 
  Damage to trees and power lines is possible. Total snow 
  accumulations of 1 to 3 inches between 3500 to 4500 feet, 3 to 
  6 inches between 4500 to 5500 feet, and 7 to 14 inches above 
  5500 feet.

* WHERE...The San Bernardino Mountains, especially the Big Bear 
  area.

* WHEN...Through 4 AM Tuesday.

* ADDITIONAL DETAILS...Winds will also be strong out of the 
  north to northeast Monday and Monday night, with gusts up to 
  50 mph at times. Be prepared for significant reductions in 
  visibility at times. Busy roadways will be impacted with 
  snowfall, including Cajon Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are occurring. If you must travel, keep an extra
flashlight, food and water in your vehicle in case of an
emergency. 

For road condition information in California...enter
8 0 0 4 2 7 7 6 2 3 if inside california or
9 1 6 4 5 5 7 6 2 3 if outside California.

$$

CAZ060-100615-
/O.CON.KSGX.WW.Y.0002.200210T0200Z-200211T0600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
206 PM PST Sun Feb 9 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO 10 PM PST MONDAY...

* WHAT...Snow expected. Plan on difficult travel conditions,
  including during the morning commute on Monday. Total snow
  accumulations of one-half to 2 inches, with localized amounts 
  up to 3 inches in the higher terrain around Landers and Johnson 
  Valley.

* WHERE...The High Desert of San Bernardino County.

* WHEN...6 PM today to 10 PM Monday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving. 

For road condition information in California...enter
8 0 0 4 2 7 7 6 2 3 if inside california or
9 1 6 4 5 5 7 6 2 3 if outside California.

$$

CAZ056-058-100615-
/O.CON.KSGX.WW.Y.0002.200210T0600Z-200211T1200Z/
Riverside County Mountains-San Diego County Mountains-
Including the cities of Idyllwild-Pine Cove, Julian, 
and Pine Valley
206 PM PST Sun Feb 9 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 10 PM THIS
EVENING TO 4 AM PST TUESDAY ABOVE 4000 FEET...

* WHAT...Snow expected. Plan on slippery road conditions, 
  including during the evening commute on Monday. Total snow 
  accumulations of 1 to 2 inches between 4000 to 5000 feet, 2 to 
  4 inches between 5000 to 6000 feet, and 5 to 10 inches above 
  6000 feet.

* WHERE...The Mountains of Riverside and San Diego Counties.

* WHEN...10 PM today to 4 AM Tuesday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving. 

For road condition information in California...enter
8 0 0 4 2 7 7 6 2 3 if inside california or
9 1 6 4 5 5 7 6 2 3 if outside California.

$$

Maxwell

925 
WWUS46 KSGX 100419
WSWSGX

URGENT - WINTER WEATHER MESSAGE
National Weather Service SAN DIEGO CA
819 PM PST Sun Feb 9 2020

CAZ055-101415-
/O.CON.KSGX.WS.W.0001.000000T0000Z-200211T1200Z/
San Bernardino County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear City,
Big Bear Lake, Running Springs, and Wrightwood
819 PM PST Sun Feb 9 2020

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST TUESDAY
ABOVE 4000 FEET...

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions. Damage to trees and power lines is possible. 
  Additional snow accumulations of 1 to 3 inches, with localized 
  amounts up to 6 inches, are expected.

* WHERE...The San Bernardino Mountains, especially the Big Bear 
  area.

* WHEN...Until 4 AM Tuesday.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are occurring. If you must travel, keep an extra
flashlight, food and water in your vehicle in case of an
emergency. 

For road condition information in California...enter
8 0 0 4 2 7 7 6 2 3 if inside california or
9 1 6 4 5 5 7 6 2 3 if outside California.

$$

CAZ060-101415-
/O.CON.KSGX.WW.Y.0002.000000T0000Z-200211T0600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
819 PM PST Sun Feb 9 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST
MONDAY...

* WHAT...Snow expected. Plan on difficult travel conditions. 
  Additional snow accumulations of up to one inch, with localized 
  amounts up to 3 inches, are expected.

* WHERE...The High Desert of San Bernardino County.

* WHEN...Until 10 PM Monday.

* ADDITIONAL DETAILS...Be prepared for reduced visibility at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibility, and use caution while driving. 

For road condition information in California...enter
8 0 0 4 2 7 7 6 2 3 if inside california or
9 1 6 4 5 5 7 6 2 3 if outside California.

$$

CAZ056-058-101415-
/O.CON.KSGX.WW.Y.0002.200210T0600Z-200211T1200Z/
Riverside County Mountains-San Diego County Mountains-
Including the cities of Idyllwild-Pine Cove, Julian, 
and Pine Valley
819 PM PST Sun Feb 9 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
TUESDAY ABOVE 4000 FEET...

* WHAT...Snow expected. Plan on slippery road conditions,
  including during the morning commute on Monday. Total snow
  accumulations of up to 3 inches, with localized amounts up to 10 
  inches, are expected.

* WHERE...The Mountains of Riverside and San Diego Counties.

* WHEN...10 PM today to 4 AM Tuesday.

* ADDITIONAL DETAILS...Be prepared for reduced visibility at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibility, and use caution while driving. 

For road condition information in California...enter
8 0 0 4 2 7 7 6 2 3 if inside california or
9 1 6 4 5 5 7 6 2 3 if outside California.

$$

908 
WWUS46 KSGX 101113
WSWSGX

URGENT - WINTER WEATHER MESSAGE
National Weather Service SAN DIEGO CA
313 AM PST Mon Feb 10 2020

CAZ055-102200-
/O.CAN.KSGX.WS.W.0001.000000T0000Z-200211T1200Z/
/O.EXB.KSGX.WW.Y.0002.000000T0000Z-200211T0000Z/
San Bernardino County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear City,
Big Bear Lake, Running Springs, and Wrightwood
313 AM PST Mon Feb 10 2020

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 4500 FEET...
...WINTER STORM WARNING IS CANCELLED...

* WHAT...Snow occurring. Plan on slippery road conditions, 
  including during the morning commute. Additional snow 
  accumulations of 1 to 3 inches are expected. 

* WHERE...San Bernardino Mountains, especially the Big Bear area.
  Elevations above 4500 feet. 

* WHEN...Until 4 PM today.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving. 

For road condition information in California...enter
8 0 0 4 2 7 7 6 2 3 if inside california or
9 1 6 4 5 5 7 6 2 3 if outside California.

$$

CAZ060-101215-
/O.CAN.KSGX.WW.Y.0002.000000T0000Z-200211T0600Z/
Apple and Lucerne Valleys-
313 AM PST Mon Feb 10 2020

...WINTER WEATHER ADVISORY IS CANCELLED...

Flurries will still be possible across the higher elevations
nearest the mountains, however little to no snow accumulation is
expected. 

$$

CAZ056-058-102200-
/O.EXT.KSGX.WW.Y.0002.000000T0000Z-200211T0000Z/
Riverside County Mountains-San Diego County Mountains-
Including the city of Idyllwild-Pine Cove
313 AM PST Mon Feb 10 2020

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 5000 FEET...

* WHAT...Snow occurring. Plan on difficult travel conditions,
  including during the morning commute. Tree branches could fall
  as well. Additional snow accumulations of 2 to 4 inches expected
  for the Riverside County Mountains. Additional accumulations of
  3 to 7 inches expected in the San Diego County Mountains, with
  localized amounts of 6 to 12 inches at the highest elevations 
  near Mount Laguna.

* WHERE...The Mountains of Riverside and San Diego Counties above
  5000 feet. Heaviest at the higher elevations of the San Diego 
  County Mountains.

* WHEN...Until 4 PM today.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving. 

For road condition information in California...enter
8 0 0 4 2 7 7 6 2 3 if inside california or
9 1 6 4 5 5 7 6 2 3 if outside California.

$$

Rodriguez

Area Forecast Discussion
National Weather Service San Diego CA
945 PM PST Sat Feb 8 2020

.SYNOPSIS...
Increasing low clouds tonight ahead of a storm moving in from the
north. the storm system will bring showers and cool conditions to
Southern California from Sunday through Tuesday morning. The
storm could bring significant snowfall to the San Bernardino
County mountains, especially eastern areas. Onshore winds will
strengthen tonight, becoming offshore Sunday night through Tuesday
as the storm moves to the southeast. Northwest flow will prevail
for the remainder of the week with near normal temperatures, and
another chance of light precipitation for next weekend.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

Low clouds are increasing in coverage west of the mtns this
evening ahead of a storm moving in from the north. By early
Sunday morning, low clouds should extend from the coast to the
foothills with areas of fog where clouds and terrain intersect.

From previous discussion...
The storm will arrive on Sunday. Models continue to present
differing solutions, especially with the speed of this system as
it forms a closed upper low over SoCal. This equates to higher
than normal uncertainty in precipitation amounts, in particular
with regards to possible wrap-around moisture on the north side
of the low Monday-Monday night. GFS is more progressive than the
EC, which effectively keeps the wrap-around moisture east of our
service area, resulting in much lighter storm total precipitation
amounts compared to the EC. This forecast sides with the higher
precipitation amounts with a mostly WPC/NBM blend.

Forecast storm total precipitation amounts continue to be in the
0.25-0.50" range for most areas, except 0.50-1.00" in the San
Bernardino mountains, the San Jacintos and Santa Rosas as well as
in the San Diego County mountains where much will fall as snow.
Snow levels fall to 3000-4000 FT Sunday night, lowest north. The
Cajon Pass could see some light snow, mainly at nighttime. 2-5"
is forecast above 4000 feet, except 6-10" is possible over the
eastern San Bernardinos in the Big Bear Lake area.

Again, snowfall amounts depend on the speed of the system. If the
storm system keeps moving fast, little snow would fall. If it
slows, significant snowfall would be likely over the San
Bernardino County mountains, especially eastern areas on favored
upslope northeast flow there. Given that the potential exists for
significant impacts to the San Bernardino County mountains,
including major mountain pass level, have issued a Winter Storm
Watch for elevations above 4000 feet effective from Sunday
afternoon through Tuesday morning. Lesser snowfall amounts are
forecast for the Riverside and San Diego County mountains.

Cold air aloft will be moving in, but the highest instability
stays over the waters Sunday night and even that is minimal. As
such, thunderstorms were removed from the forecast. Maximum
rainfall rates will be 0.30"/hr or less, so the urban flood and
flash flood risk is low.

The storm will depart and precipitation will come to an end from
west to east during the Monday afternoon-Tuesday morning period.

Onshore winds will strenghten ahead of the storm but only peak
gusts to 45 mph expected on the desert slopes. Winds will turn
quickly northeast by Sunday evening and remain offshore through
Tuesday with gusts from the mountain ridges to the coastal
mountain slopes to 50+ mph. Gusts over the northern Inland Empire
to the Santa Anas and foothills could reach around 40 mph.

Dry weather will return Tuesday afternoon and last through
Thursday with gradually warming temperatures. Another storm could
arrive from the north for next weekend.

&&

.AVIATION...
090500Z...Coast/Valleys/Mountains...Deepening moisture
associated with an approaching frontal system tonight with
cloud bases 1000-2000 feet MSL, tops initially 2500 feet,
will deepen to exceed 4000 feet MSL by 12Z. Higher terrain becoming
obscured in clouds after 12z, and in showers and merging cloud layers
to 15000 feet MSL after about 18Z. Strong southerly morning winds on
Sunday will become westerly, and finally shift to easterly by
09Z early Monday morning as the frontal system moves through.
Strong up and downdrafts along with wind shear can be expected
Sunday through Monday near mountains and adjacent mountain
slopes as winds increase to 20 to 30 knots with gusts approaching
50 knots at times.
Desert Areas...Clouds, showers, and deteriorating conditions reaching
into the deserts by around 00z Sunday afternoon and continuing
into Monday.

&&

.MARINE...
A storm system will bring showers Sunday through Monday, but current
guidance suggests that the thunderstorm risk is now minimal.
Otherwise, no hazardous weather is expected through Wednesday.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Winter Storm Watch from Sunday afternoon through Tuesday morning
     for San Bernardino County Mountains.

PZ...NONE.

&&

PUBLIC...PG
AVIATION/MARINE...Small