138  
FNUS86 KLOX 182357  
FWLLOX  
 
ECCDA DISCUSSIONS  
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA  
357 PM PST SUN FEB 18 2018  
 
ECC029-191800-  
LOS PADRES NATIONAL FOREST-  
DISCUSSION FOR VANDENBERG ECC DISPATCH  
357 PM PST SUN FEB 18 2018  
   
..DISCUSSION FROM LOS ANGELES/OXNARD
 
 
...MUCH COLDER CONDITIONS WITH GUSTY NORTHERLY WINDS AND RAIN AND  
MOUNTAIN SNOW SHOWERS TONIGHT THROUGH MONDAY NIGHT FOR MUCH OF  
SOUTHWEST CALIFORNIA...  
 
ONSHORE WINDS WILL CONTINUE TO STRENGTHEN THIS AFTERNOON AND EVENING  
AHEAD OF A DEEPENING LOW PRESSURE SYSTEM DROPPING SOUTHWARD ACROSS  
CALIFORNIA. THIS ALONG WITH A MODERATE EDDY WILL LIKELY SUPPORT  
FAIRLY RAPID MARINE LAYER DEVELOPMENT AND DEEPENING THIS AFTERNOON  
INTO TONIGHT. THIS LOW PRESSURE SYSTEM HAS LIMITED MOISTURE DUE TO  
ITS MOSTLY OVER-LAND TRAJECTORY, BUT SCATTERED SHOWERS WILL DEVELOP  
ACROSS THE REGION TONIGHT INTO MONDAY, ESPECIALLY FOR NORTH FACING  
MOUNTAIN SLOPES, EASTERN LOS ANGELES COUNTY, AND ALL AREAS NORTH OF  
POINT CONCEPTION. THIS SYSTEM WILL LIKELY BRING THE COLDEST AIR MASS  
OF THE SEASON ALONG WITH WINDY CONDITIONS. SNOW LEVELS WILL LOWER  
RAPIDLY OVERNIGHT, FALLING AS LOW AS 1500 FEET ON MONDAY. THE COLD  
TEMPERATURES WITH STRONG WINDS WILL PRODUCE DANGEROUS WIND CHILL  
READINGS ON MONDAY ACROSS THE MOUNTAINS. MOST OF THE SNOW  
ACCUMULATION WILL BE ON NORTH FACING MOUNTAIN SLOPES WHERE 2 TO  
4 INCHES COULD ACCUMULATE. EVEN INTERSTATE 5 NEAR THE GRAPEVINE  
COULD SEE 1 TO 2 INCHES OF SNOW ALONG WITH ICY ROAD CONDITIONS.  
BRIEF SNOW SHOWERS WILL ALSO BE POSSIBLE ACROSS FOOTHILL AND VALLEY  
AREAS ABOVE 1500 FEET ON MONDAY. WIDESPREAD FROST AND FREEZE  
CONDITIONS ARE EXPECTED MONDAY NIGHT AND AGAIN TUESDAY NIGHT AS THIS  
VERY COLD AIR MASS SETTLES OVER THE REGION.  
 
   
..DISCUSSION FROM MONTEREY
 
 
...SCATTERED SHOWERS TONIGHT AND MONDAY MORNING WITH VERY LOW SNOW  
LEVELS... ...WIDESPREAD FREEZING TEMPERATURES EXPECTED INLAND LATE  
MONDAY NIGHT AND EARLY TUESDAY...  
 
A COLD WEATHER SYSTEM WILL PRODUCE SCATTERED SHOWERS TONIGHT AND  
MONDAY MORNING, MAINLY ALONG THE COAST AND IN THE COASTAL HILLS.  
SNOW LEVELS WILL DROP TO 1500 FEET TONIGHT AND AS LOW AS 1000 FEET  
OR LOWER ON MONDAY. SNOW COULD OCCUR LOCALLY AS LOW AS 500 FEET.  
GREATEST POTENTIAL FOR SNOW ACCUMULATION IS ABOVE 1500 FEET IN THE  
SANTA CRUZ MOUNTAINS AND SANTA LUCIA MOUNTAINS. IN ADDITION,  
LOCALLY STRONG AND GUSTY NORTHWEST WINDS WILL PERSIST THROUGH  
MONDAY, ESPECIALLY NEAR THE COAST WHERE GUSTS TO 40 MPH ARE LIKELY.  
VERY COLD TEMPERATURES ARE FORECAST FOR MONDAY NIGHT ONCE SKIES  
CLEAR AND WINDS SUBSIDE. WIDESPREAD FREEZING TEMPERATURES ARE  
FORECAST FOR INLAND AREAS LATE MONDAY NIGHT AND TUESDAY MORNING AND  
FROST MAY OCCUR ALL THE WAY TO THE COAST. A COOL AND UNSETTLE  
WEATHER PATTERN IS FORECAST TO PERSIST THROUGH THE WEEK AND INTO  
NEXT WEEKEND.  
 
NOTE : ALL WINDS ARE 20-FOOT WINDS UNLESS OTHERWISE SPECIFIED.  
THUNDERSTORMS IMPLY STRONG, GUSTY AND ERRATIC WINDS.  
 

 
 
ECC028-191800-  
SANTA BARBARA COUNTY EXCLUDING LOS PADRES NATIONAL FOREST-  
DISCUSSION FOR SANTA BARBARA ECC DISPATCH  
357 PM PST SUN FEB 18 2018  
 
...MUCH COLDER CONDITIONS WITH GUSTY NORTHERLY WINDS AND RAIN AND  
MOUNTAIN SNOW SHOWERS TONIGHT THROUGH MONDAY NIGHT FOR MUCH OF  
SOUTHWEST CALIFORNIA...  
 
ONSHORE WINDS WILL CONTINUE TO STRENGTHEN THIS AFTERNOON AND EVENING  
AHEAD OF A DEEPENING LOW PRESSURE SYSTEM DROPPING SOUTHWARD ACROSS  
CALIFORNIA. THIS ALONG WITH A MODERATE EDDY WILL LIKELY SUPPORT  
FAIRLY RAPID MARINE LAYER DEVELOPMENT AND DEEPENING THIS AFTERNOON  
INTO TONIGHT. THIS LOW PRESSURE SYSTEM HAS LIMITED MOISTURE DUE TO  
ITS MOSTLY OVER-LAND TRAJECTORY, BUT SCATTERED SHOWERS WILL DEVELOP  
ACROSS THE REGION TONIGHT INTO MONDAY, ESPECIALLY FOR NORTH FACING  
MOUNTAIN SLOPES, EASTERN LOS ANGELES COUNTY, AND ALL AREAS NORTH OF  
POINT CONCEPTION. THIS SYSTEM WILL LIKELY BRING THE COLDEST AIR MASS  
OF THE SEASON ALONG WITH WINDY CONDITIONS. SNOW LEVELS WILL LOWER  
RAPIDLY OVERNIGHT, FALLING AS LOW AS 1500 FEET ON MONDAY. THE COLD  
TEMPERATURES WITH STRONG WINDS WILL PRODUCE DANGEROUS WIND CHILL  
READINGS ON MONDAY ACROSS THE MOUNTAINS. MOST OF THE SNOW  
ACCUMULATION WILL BE ON NORTH FACING MOUNTAIN SLOPES WHERE 2 TO  
4 INCHES COULD ACCUMULATE. EVEN INTERSTATE 5 NEAR THE GRAPEVINE  
COULD SEE 1 TO 2 INCHES OF SNOW ALONG WITH ICY ROAD CONDITIONS.  
BRIEF SNOW SHOWERS WILL ALSO BE POSSIBLE ACROSS FOOTHILL AND VALLEY  
AREAS ABOVE 1500 FEET ON MONDAY. WIDESPREAD FROST AND FREEZE  
CONDITIONS ARE EXPECTED MONDAY NIGHT AND AGAIN TUESDAY NIGHT AS THIS  
VERY COLD AIR MASS SETTLES OVER THE REGION.  
 

 
 
ECC031-191800-  
ANGELES NATIONAL FOREST-  
DISCUSSION FOR LANCASTER ECC DISPATCH  
357 PM PST SUN FEB 18 2018  
 
...MUCH COLDER CONDITIONS WITH GUSTY NORTHERLY WINDS AND RAIN AND  
MOUNTAIN SNOW SHOWERS TONIGHT THROUGH MONDAY NIGHT FOR MUCH OF  
SOUTHWEST CALIFORNIA...  
 
ONSHORE WINDS WILL CONTINUE TO STRENGTHEN THIS AFTERNOON AND EVENING  
AHEAD OF A DEEPENING LOW PRESSURE SYSTEM DROPPING SOUTHWARD ACROSS  
CALIFORNIA. THIS ALONG WITH A MODERATE EDDY WILL LIKELY SUPPORT  
FAIRLY RAPID MARINE LAYER DEVELOPMENT AND DEEPENING THIS AFTERNOON  
INTO TONIGHT. THIS LOW PRESSURE SYSTEM HAS LIMITED MOISTURE DUE TO  
ITS MOSTLY OVER-LAND TRAJECTORY, BUT SCATTERED SHOWERS WILL DEVELOP  
ACROSS THE REGION TONIGHT INTO MONDAY, ESPECIALLY FOR NORTH FACING  
MOUNTAIN SLOPES, EASTERN LOS ANGELES COUNTY, AND ALL AREAS NORTH OF  
POINT CONCEPTION. THIS SYSTEM WILL LIKELY BRING THE COLDEST AIR MASS  
OF THE SEASON ALONG WITH WINDY CONDITIONS. SNOW LEVELS WILL LOWER  
RAPIDLY OVERNIGHT, FALLING AS LOW AS 1500 FEET ON MONDAY. THE COLD  
TEMPERATURES WITH STRONG WINDS WILL PRODUCE DANGEROUS WIND CHILL  
READINGS ON MONDAY ACROSS THE MOUNTAINS. MOST OF THE SNOW  
ACCUMULATION WILL BE ON NORTH FACING MOUNTAIN SLOPES WHERE 2 TO  
4 INCHES COULD ACCUMULATE. EVEN INTERSTATE 5 NEAR THE GRAPEVINE  
COULD SEE 1 TO 2 INCHES OF SNOW ALONG WITH ICY ROAD CONDITIONS.  
BRIEF SNOW SHOWERS WILL ALSO BE POSSIBLE ACROSS FOOTHILL AND VALLEY  
AREAS ABOVE 1500 FEET ON MONDAY. WIDESPREAD FROST AND FREEZE  
CONDITIONS ARE EXPECTED MONDAY NIGHT AND AGAIN TUESDAY NIGHT AS THIS  
VERY COLD AIR MASS SETTLES OVER THE REGION.  
 

 
 
ECC024-191800-  
SAN LUIS OBISPO COUNTY-  
DISCUSSION FOR SAN LUIS OBISPO ECC DISPATCH  
357 PM PST SUN FEB 18 2018  
 
...MUCH COLDER CONDITIONS WITH GUSTY NORTHERLY WINDS AND RAIN AND  
MOUNTAIN SNOW SHOWERS TONIGHT THROUGH MONDAY NIGHT FOR MUCH OF  
SOUTHWEST CALIFORNIA...  
 
ONSHORE WINDS WILL CONTINUE TO STRENGTHEN THIS AFTERNOON AND EVENING  
AHEAD OF A DEEPENING LOW PRESSURE SYSTEM DROPPING SOUTHWARD ACROSS  
CALIFORNIA. THIS ALONG WITH A MODERATE EDDY WILL LIKELY SUPPORT  
FAIRLY RAPID MARINE LAYER DEVELOPMENT AND DEEPENING THIS AFTERNOON  
INTO TONIGHT. THIS LOW PRESSURE SYSTEM HAS LIMITED MOISTURE DUE TO  
ITS MOSTLY OVER-LAND TRAJECTORY, BUT SCATTERED SHOWERS WILL DEVELOP  
ACROSS THE REGION TONIGHT INTO MONDAY, ESPECIALLY FOR NORTH FACING  
MOUNTAIN SLOPES, EASTERN LOS ANGELES COUNTY, AND ALL AREAS NORTH OF  
POINT CONCEPTION. THIS SYSTEM WILL LIKELY BRING THE COLDEST AIR MASS  
OF THE SEASON ALONG WITH WINDY CONDITIONS. SNOW LEVELS WILL LOWER  
RAPIDLY OVERNIGHT, FALLING AS LOW AS 1500 FEET ON MONDAY. THE COLD  
TEMPERATURES WITH STRONG WINDS WILL PRODUCE DANGEROUS WIND CHILL  
READINGS ON MONDAY ACROSS THE MOUNTAINS. MOST OF THE SNOW  
ACCUMULATION WILL BE ON NORTH FACING MOUNTAIN SLOPES WHERE 2 TO  
4 INCHES COULD ACCUMULATE. EVEN INTERSTATE 5 NEAR THE GRAPEVINE  
COULD SEE 1 TO 2 INCHES OF SNOW ALONG WITH ICY ROAD CONDITIONS.  
BRIEF SNOW SHOWERS WILL ALSO BE POSSIBLE ACROSS FOOTHILL AND VALLEY  
AREAS ABOVE 1500 FEET ON MONDAY. WIDESPREAD FROST AND FREEZE  
CONDITIONS ARE EXPECTED MONDAY NIGHT AND AGAIN TUESDAY NIGHT AS THIS  
VERY COLD AIR MASS SETTLES OVER THE REGION.  
 

 
 
ECC032-191800-  
VENTURA COUNTY EXCLUDING LOS PADRES NATIONAL FOREST-  
DISCUSSION FOR VENTURA ECC DISPATCH  
357 PM PST SUN FEB 18 2018  
 
...MUCH COLDER CONDITIONS WITH GUSTY NORTHERLY WINDS AND RAIN AND  
MOUNTAIN SNOW SHOWERS TONIGHT THROUGH MONDAY NIGHT FOR MUCH OF  
SOUTHWEST CALIFORNIA...  
 
ONSHORE WINDS WILL CONTINUE TO STRENGTHEN THIS AFTERNOON AND EVENING  
AHEAD OF A DEEPENING LOW PRESSURE SYSTEM DROPPING SOUTHWARD ACROSS  
CALIFORNIA. THIS ALONG WITH A MODERATE EDDY WILL LIKELY SUPPORT  
FAIRLY RAPID MARINE LAYER DEVELOPMENT AND DEEPENING THIS AFTERNOON  
INTO TONIGHT. THIS LOW PRESSURE SYSTEM HAS LIMITED MOISTURE DUE TO  
ITS MOSTLY OVER-LAND TRAJECTORY, BUT SCATTERED SHOWERS WILL DEVELOP  
ACROSS THE REGION TONIGHT INTO MONDAY, ESPECIALLY FOR NORTH FACING  
MOUNTAIN SLOPES, EASTERN LOS ANGELES COUNTY, AND ALL AREAS NORTH OF  
POINT CONCEPTION. THIS SYSTEM WILL LIKELY BRING THE COLDEST AIR MASS  
OF THE SEASON ALONG WITH WINDY CONDITIONS. SNOW LEVELS WILL LOWER  
RAPIDLY OVERNIGHT, FALLING AS LOW AS 1500 FEET ON MONDAY. THE COLD  
TEMPERATURES WITH STRONG WINDS WILL PRODUCE DANGEROUS WIND CHILL  
READINGS ON MONDAY ACROSS THE MOUNTAINS. MOST OF THE SNOW  
ACCUMULATION WILL BE ON NORTH FACING MOUNTAIN SLOPES WHERE 2 TO  
4 INCHES COULD ACCUMULATE. EVEN INTERSTATE 5 NEAR THE GRAPEVINE  
COULD SEE 1 TO 2 INCHES OF SNOW ALONG WITH ICY ROAD CONDITIONS.  
BRIEF SNOW SHOWERS WILL ALSO BE POSSIBLE ACROSS FOOTHILL AND VALLEY  
AREAS ABOVE 1500 FEET ON MONDAY. WIDESPREAD FROST AND FREEZE  
CONDITIONS ARE EXPECTED MONDAY NIGHT AND AGAIN TUESDAY NIGHT AS THIS  
VERY COLD AIR MASS SETTLES OVER THE REGION.  
 

 
 
ECC030-191800-  
LOS ANGELES COUNTY EXCLUDING ANGELES NATIONAL FOREST-  
DISCUSSION FOR LOS ANGELES ECC DISPATCH  
357 PM PST SUN FEB 18 2018  
 
...MUCH COLDER CONDITIONS WITH GUSTY NORTHERLY WINDS AND RAIN AND  
MOUNTAIN SNOW SHOWERS TONIGHT THROUGH MONDAY NIGHT FOR MUCH OF  
SOUTHWEST CALIFORNIA...  
 
ONSHORE WINDS WILL CONTINUE TO STRENGTHEN THIS AFTERNOON AND EVENING  
AHEAD OF A DEEPENING LOW PRESSURE SYSTEM DROPPING SOUTHWARD ACROSS  
CALIFORNIA. THIS ALONG WITH A MODERATE EDDY WILL LIKELY SUPPORT  
FAIRLY RAPID MARINE LAYER DEVELOPMENT AND DEEPENING THIS AFTERNOON  
INTO TONIGHT. THIS LOW PRESSURE SYSTEM HAS LIMITED MOISTURE DUE TO  
ITS MOSTLY OVER-LAND TRAJECTORY, BUT SCATTERED SHOWERS WILL DEVELOP  
ACROSS THE REGION TONIGHT INTO MONDAY, ESPECIALLY FOR NORTH FACING  
MOUNTAIN SLOPES, EASTERN LOS ANGELES COUNTY, AND ALL AREAS NORTH OF  
POINT CONCEPTION. THIS SYSTEM WILL LIKELY BRING THE COLDEST AIR MASS  
OF THE SEASON ALONG WITH WINDY CONDITIONS. SNOW LEVELS WILL LOWER  
RAPIDLY OVERNIGHT, FALLING AS LOW AS 1500 FEET ON MONDAY. THE COLD  
TEMPERATURES WITH STRONG WINDS WILL PRODUCE DANGEROUS WIND CHILL  
READINGS ON MONDAY ACROSS THE MOUNTAINS. MOST OF THE SNOW  
ACCUMULATION WILL BE ON NORTH FACING MOUNTAIN SLOPES WHERE 2 TO  
4 INCHES COULD ACCUMULATE. EVEN INTERSTATE 5 NEAR THE GRAPEVINE  
COULD SEE 1 TO 2 INCHES OF SNOW ALONG WITH ICY ROAD CONDITIONS.  
BRIEF SNOW SHOWERS WILL ALSO BE POSSIBLE ACROSS FOOTHILL AND VALLEY  
AREAS ABOVE 1500 FEET ON MONDAY. WIDESPREAD FROST AND FREEZE  
CONDITIONS ARE EXPECTED MONDAY NIGHT AND AGAIN TUESDAY NIGHT AS THIS  
VERY COLD AIR MASS SETTLES OVER THE REGION.  
 

 
 
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