Ocean / Surf Report

Pismo Beach

Get our updated surf/ocean report and weather report with data provided by the Diablo Canyon Weather Report.

1/18/2017

SEA/SWELL: 

     A 5- to 7-foot northwesterly (295-degree, deep-water)
     swell (with an 8- to 15-second period) is forecast along
     our coastline this afternoon into tonight. Combined 
     with today's and Thursday morning's swell will be
     5- to 7-foot southerly (190-degree, shallow-water) seas. 

     A series of intense low-pressure systems with near
     hurricane force winds will travel across the northern
     Pacific into Sunday. These storms will produce large
     swell events along the Northern and Central California
     coastline.

     A 9- to 11-foot west-northwesterly (280-degree, deep-
     water) swell (with a 12- to 14-second period) will
     arrive along our coastline Thursday, increasing to 13
     to 15 feet (with a 14- to 16-second period) by Friday.

     This west-northwesterly (290-degree, deep-water) swell
     is expected to peak at 18 to 20 feet (with a 16- to
     18-second period) Saturday morning, decreasing to 16
     to 18 feet by Saturday afternoon and night with the 
     same period.

     Note: As this swell travels southeastward at 25 knots
           toward the Central Coast, it should peak at 41
           feet with a 17-second period at the SE Papa 
           NOAA marine buoy (600 nautical miles west of
           Eureka) Friday morning at 8 a.m. 
     
           The West California NOAA marine buoy (357
           nautical miles west of San Francisco) is 
           expected to see the swell peak Friday evening 
           at 7 p.m. at 36 feet with an 18-second period. 

           The offshore NOAA marine and CDIP buoys along
           the Central Coast will see swell heights near
           27 feet on Saturday. 

     A 10- to 12-foot west-northwesterly (290-degree, deep-
     water) swell (with a 14- to 16-second period) is
     expected along our coastline on Sunday, increasing to
     11 to 13 feet (with a 13- to 15-second period) by 
     Monday. 

     Note:  Combined with Sunday's swell will be 10- to 12- 
            foot southerly (190-degree, shallow-water) seas. 

     A 9- to 11-foot west-northwesterly (290-degree, deep-
     water) swell (with an 11- to 14-second period) is
     forecast on Tuesday, decreasing to 6 to 8 feet with 
     the same period next Wednesday. 

  ATMOSPHERIC CONDITION:

     The high-pressure ridge responsible for the dry weather
     has shifted southward in response to a deep trough of low
     pressure over the eastern Pacific. This condition has
     opened the storm door for California as vigorous upper-
     level winds draw in a series of low-pressure systems.

     The first system in this series will be a cold front
     that will produce increasing clouds with sprinkles/light
     rain showers this morning into this afternoon. As the
     front approaches San Luis Obispo and northern Santa Barbara
     counties tonight, the southerly winds will build
     to moderate gale-force to fresh gale-force (32 to 46 mph)
     levels along the coastline and showers will turn to study
     rain tonight into early Thursday morning. Total rainfall
     amounts will range between 1.00 and 1.75 inches. Snow
     levels will lower to 5,000 feet. 

     A break in the weather looks possible Thursday afternoon
     and night, before another cold front moves in Friday
     morning with moderate gale-force to fresh gale-force
     (32 to 46) southerly winds along the coastline and heavy
     rain. Rain will turn to showers Friday afternoon into 
     Saturday morning as strong to gale-force (25 to 38 mph)
     northwesterly winds develop along the coastline. Total
     rainfall amounts will range between 1.25 and 1.75 inches.  
     Snow levels are expected to range around 3,500 feet on
     Friday into Saturday.

     The last installment in a three part trilogy of storms
     and likely the strongest will tap into huge plume of
     subtropical moisture "Atmospheric River" and will produce
     fresh gale-force to strong gale-force (39 to 54 mph)
     southerly winds along the coastline and heavy rain on
     Sunday. Rain to turned to showers on Monday. Total
     rainfall amounts with this system will range between
     2.00 and 4.00 inches.

     High pressure is then expected to build back into the
     region Tuesday and should produce night and morning
     Santa Lucia (offshore) winds and dry weather through
     next Thursday

   Weather graphics and power outage information are available
   at: twitter.com/pge_john.

         Yesterday's          Today's           Tomorrow's
         Min    Max         Min    Max         Min     Max
        50.1°   59.5°      47.7°   58.0°      51.0°    58.0°

    PG&E Weather Office in San Francisco predicted temperatures
    for San Luis Obispo County

    Inland Temperatures, Paso Robles 
 
      Actual                 Predicted
   
       Tue      Wed     Thu    Fri    Sat    Sun    Mon    Tue
      29 62    37 54   46 55  46 53  42 56  48 55  38 52  35 55      
                                       
    Coastal Valleys Temperatures, San Luis Obispo       
      
       Tue      Wed     Thu    Fri    Sat    Sun    Mon    Tue
      36 67    42 59   50 60  45 56  45 60  51 58  44 57  39 60    
    
  WINDS:

    Strong to gale-force (25 to 38 mph) southerly winds are 
    forecast this afternoon, increasing to moderate gale-force
    to fresh gale-force (32 to 46 mph) levels tonight. These
    southerly winds will decrease Thursday morning into Thursday
    night. 

    Moderate gale-force to fresh gale-force (32 to 46 mph) southerly
    winds are forecast on Friday morning, followed by strong to
    gale-force (25 to 38 mph) northwesterly winds on Friday
    afternoon into Saturday morning. decreasing Saturday afternoon.

    Moderate to fresh (13 to 24 mph) southeasterly winds are 
    forecast Saturday night, increasing to fresh gale-force to
    strong gale-force (39 to 54 mph) levels along the coastline
    on Sunday morning, decreasing Sunday afternoon and night. 

    Moderate gale-force to fresh gale-force (32 to 46 mph) 
    northwesterly winds are forecast on Monday, decreasing 
    and shifting out of the northeast next Tuesday and Wednesday.

  DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

       Today's Maximum Winds:

        Max peak winds:       SE            8.9 mph @  5:30 a.m.
        Max sustained wind:   SE            6.7 mph @  5:30 a.m.
  
      Yesterday's Maximum Winds:
       
        Max peak winds:       NE           12.8 mph @  3:15 a.m.
        Max sustained wind:   NE            8.7 mph @  3:15 a.m.
      
  SEAWATER TEMPERATURES:

    Seawater temperatures will range between 54 and 56 degrees 
    through Monday.
      
  OCEAN CURRENTS: 

    Today's northerly (onshore) flowing current will continue to 
    flow northward through Sunday, becoming a southerly (offshore) 
    flowing current on Monday.

  SEAWATER VISIBILITY:
 
    Seawater visibility was 14 to 16 feet at the Diablo Canyon Intake.

==========================================================================
 24-Hour Ocean Condition Outlook for Wednesday 01/18 to Thursday 01/19
 
  SEA/SWELL:        DIR. NW    HT.  4-6   PER.  8-15    This morning  
  Increasing to:    DIR. NW    HT.  5-7   PER.  8-15    This afternoon
  Remaining  at:    DIR. NW    HT.  5-7   PER.  9-14    Tonight

 (Combined with:    DIR  S     HT   5-7   PER.  4-6     Tonight) 

  WINDS:            DIR. SE    SPEED 10-15              This morning
  Increasing to:    DIR. SE    SPEED 25-30 + 35         This afternoon
  Increasing to:    DIR. SE    SPEED 35-40 + 45         Tonight
===========================================================================
 48-Hour Ocean Condition Outlook for Thursday 01/19 to Friday 01/20
    
  SEA/SWELL:        DIR. WNW   HT.  8-10  PER. 11-13    Thursday morning  
  Increasing to:    DIR. WNW   HT.  9-11  PER. 12-14    Thursday afternoon
  Remaining  at:    DIR. WNW   HT.  9-11  PER. 12-14    Thursday night

 (Combined with:    DIR  S     HT   4-6   PER.  5-7     Thursday morning) 

  WINDS:            DIR. SW    SPEED 25-30 + 35         Thursday morning
  Decreasing to:    DIR. SW    SPEED 15-20 + 25         Thursday afternoon
  Decreasing to:    DIR. W     SPEED 10-15 + 20         Thursday night
===========================================================================

 Extended Ocean Condition Outlook:

   A west-northwesterly (290-degree, deep-water) swell is expected 
   to peak at 18 to 20 feet (with a 16- to 18-second period) Saturday
   morning, decreasing to 16 to 18 feet by Saturday afternoon and
   night with the same period.
   
===========================================================================

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