Weather Service Report


993 
WWUS46 KLOX 181341
WSWLOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
541 AM PST Sun Feb 18 2018

...Winter Weather Advisory in effect from 6 pm this evening to 3 
am Tuesday for the Los Angeles and Ventura county mountains...

.A very cold storm will move through California tonight and
Monday. This system will take a mostly over-land trajectory with 
the best moisture and upslope flow focused on the north facing 
slopes and across eastern Los Angeles County. This system will 
bring the coldest so far this winter season, with snow levels 
potentially falling as low as 1500 feet on Monday. There could be 
significant travel impacts with possible road closures and delays.
Low elevation mountain roadways that could be impacted by snow 
showers, icy roads, and strong winds include Interstate 5 near the
Grapevine, Highway 14 through Soledad Canyon, and Highway 33 
above Ojai. With such low snow levels, there is also slight chance
of snow showers on Monday across the San Luis Obispo county 
Interior Valleys, Cuyama Valley, foothills of the Central Coast 
(including the Cuesta Pass), Antelope Valley, Santa Clarita 
Valley, and the foothills in the Los Angeles and Ventura county 
valleys.

CAZ053-054-182345-
/O.CON.KLOX.WW.Y.0003.180219T0200Z-180220T1100Z/
Ventura County Mountains-
Los Angeles County Mountains excluding the Santa Monica Range-
Including the cities of Lockwood Valley, Mount Pinos, Acton, 
Mount Wilson, and Sandberg
541 AM PST Sun Feb 18 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO 3 AM PST TUESDAY...

* WHAT...SNOW...2 to 4 inches expected. Snow levels will be
  between 5000 and 5500 feet this evening, then lower rapidly to
  between 1500 and 2500 feet by early Monday morning and continue
  at those levels into Monday night. Areas of northwest to north
  winds 25 to 35 mph with gusts to 50 mph are expected, with
  isolated higher gusts. Wind chill readings will be between 10
  degrees and -10 degrees in higher elevations late tonight and 
  Monday.

* WHERE...Ventura County Mountains and Los Angeles County 
  Mountains excluding the Santa Monica Range Counties.

* WHEN...From 6 PM this evening to 3 AM PST Tuesday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times. The strongest winds will be through the I-5 corridor. The
  highest snowfall amounts will occur on the north facing slopes.
  There is the potential for 1 to 2 inches of snow on Interstate 5
  near the Grapevine. Delays or closures on Interstate 5 are
  possible Monday into Monday night due to accumulating snow, icy
  road conditions, and strong winds. Other low elevation roadways
  will be at risk for snow showers and icy road conditions as
  well. These include Highways 2, 14, 33, and 39.

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.
The latest road conditions from CalTrans is available by calling
1 800 4 2 7 7 6 2 3.

$$

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Western Regional Climate Center, wrcc@dri.edu