Pismo Beach Ocean / Surf Report

1/21/2020

SEA/SWELL:

    A 7- to 9-foot northwesterly (295-degree, deep-water)
    swell (with an 8- to 17-second period) will arrive along
    our coastline today, building to 8 to 10 feet (with
    an 8- to 15-second period) on Wednesday.

    A 4- to 6-foot northwesterly (300-degree, deep-water) sea
    and swell is expected along our coastline on Thursday into
    Friday morning.

    An 8- to 10-foot west-northwesterly (285-degree, deep-water)
    swell (with an 18- to 20-second period) will arrive along
    our coastline on Friday afternoon and will remain at this
    height but (with a 15- to 17-second period) on Saturday,
    decreasing to 5 to 7 feet by Sunday morning.

    A 7- to 9-foot northwesterly (295-degree, deep-water)
    swell (with a 15- to 22-second period) is expected Sunday
    afternoon, building to 9 to 11 feet (with a 13- to 17-
    second period) on Monday and Tuesday. A higher-energy
    west-northwesterly swell is forecast to arrive along our
    coastline on January 30 and 31.

   ATMOSPHERIC CONDITIONS:

    Gentle to moderate (8 to 18 mph) variable winds and partly
    cloudy skies are forecast today. Today's high temperatures
    will range between the low to mid-60s.

    A weak cold front will produce gentle to moderate
    (8 to 18 mph) southerly winds, increasing clouds and
    light rain showers as far south as Pismo Beach tonight
    into Wednesday late morning. Moderate to fresh (13 to 24
    mph) northwesterly winds and partly cloudy skies are
    forecast on Wednesday afternoon and night. Snow levels
    across the Sierra Nevada will range from 4,500 and
    6,500 feet North to South.

    High pressure will build over the California on Thursday
    through Friday morning. This condition will produce
    moderate to fresh (13 to 24 mph with gust to 40 mph)
    Santa Lucia (northeasterly) winds and mostly sunny skies.
    High temperatures in the coastal valleys will increase
    to the low 70s on Thursday and Friday.  

    Moderate to fresh (13 to 24 mph) northwesterly (onshore)
    winds on Friday afternoon into Saturday will allow the
    marine layer to develop along beaches and coastal valleys
    on Friday night onto Saturday.

    A cold front will bring moderate to fresh (13 to 24 mph)
    southerly winds, increasing clouds and rain on Sunday
    morning and afternoon. This system may tap some sub-tropical
    moisture which will produce higher snow levels and mild
    temperatures. At this time, between one tenth to a half
    of an inch of rain expected. The cold front will be
    followed by strong to gale-force (25 to 38 mph)
    northwesterly winds and partly clouds skies.

    The long-range models and charts indicate dry weather
    starting Monday and continuing through the first week
    of February.

   WILDFIRE INDEX RATINGS:

    The PG&E Fire Index Ratings will be at medium (R2) levels
    along the Coastline, Coastal and Inland Valleys and Far
    Inland Areas, expect for 575 and 582 which will be at
    low (R1) levels today and Wednesday.

  DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA:

         Yesterday's          Today's           Tomorrow's
         Min    Max         Min    Max         Min     Max
        54.4°   58.8°      52.6°   60.0°      50.0°    59.0°

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

    Inland Temperatures, Paso Robles

     Actual                    Predicted
              
       Mon      Tue    Wed    Thu    Fri   Sat   Sun   Mon    Tue
      42 55    45 58  44 63  44 64  42 65 40 66 43 63 40 64  41 65                        

   Coastal Valleys Temperatures, San Luis Obispo

       Mon      Tue    Wed    Thu    Fri   Sat   Sun   Mon    Tue
      46 59    48 60  46 66  50 72  49 68 47 67 46 67 47 66  49 69                    
                    
  WINDS:

    Gentle to moderate (8 to 18 mph) variable winds are forecast
    today into Wednesday morning, shifting out of the northwest
    and increasing to  Moderate to fresh (13 to 24 mph) levels
    on Wednesday.

    Moderate to fresh (13 to 24 mph) Santa Lucia (northeasterly)
    winds are forecast on Wednesday night through Friday morning.  

    Moderate to fresh (13 to 24 mph) northwesterly (onshore)
    winds are forecast on Friday afternoon into Saturday,
    followed by southerly winds on Sunday.

  DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

     Last night's Maximum Winds:
 
        Max peak winds:       SE            8.0 mph @   5:30 a.m.
        Max sustained wind:   SE            5.0 mph @   5:30 a.m.

     Yesterday's Maximum Winds:       
        
        Max peak winds:       SE           19.0 mph @   8:30 a.m.
        Max sustained wind:   SE            9.0 mph @   8:30 a.m.


  SEAWATER TEMPERATURES:

     Intake seawater temperatures will range from 54 and 57 degrees
     through Friday.

  OCEAN CURRENTS:

     A northerly (onshore) flowing current will continue to flow
     northward through Wednesday.

     A southerly (offshore) flowing current is forecast on Thursday
     through Saturday.

  SEAWATER VISIBILITY:

     Seawater visibility was 3 to 5 feet at the Diablo Canyon Marina.

==========================================================================
24-Hour Ocean Condition Outlook for Tuesday 01/21 to Wednesday 01/22

  SWELL:            DIR. NW      HT.  6-8   PER.  8-18  This morning
  Increasing to:    DIR. NW      HT.  7-9   PER.  8-17  This afternoon
  Remaining  at:    DIR. NW      HT.  7-9   PER.  8-16  Tonight

  WINDS:            DIR. VAR.    SPEED  5-10            This morning
  Remaining  at:    DIR. VAR     SPEED  5-10            This afternoon
  Remaining  at:    DIR. SE      SPEED 10-15            Tonight
==========================================================================
48-Hour Ocean Condition Outlook for Wednesday 01/22 to Thursday 01/23
   
  SWELL:            DIR. NW      HT.  8-10  PER.  8-15  Wednesday morning
  Remaining  at:    DIR. NW      HT.  8-10  PER.  8-15  Wednesday afternoon
  Remaining  at:    DIR. NW      HT.  8-10  PER.  8-14  Wednesday night

  WINDS:            DIR. SE      SPEED 10-15            Wednesday morning
  Increasing to:    DIR. NW      SPEED 15-20 + 25       Wednesday afternoon
  Remaining  at:    DIR. NE      SPEED 15-20 + 25       Wednesday night
==========================================================================

Extended Ocean Condition Outlook:
 
   A higher-energy  west-northwesterly swell is forecast to arrive along
   our coastline on January 30 and 31.
   
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