Pismo Beach Ocean / Surf Report

4/2/2020


  SEA/SWELL:

    Increasing northwesterly winds off and along the California
    coastline will generate a 6- to 8-foot northwesterly (310-
    degree, deep-water) sea and swell (with a 7- to 11-second
    period) through Friday.

    A 4- to 6-foot west-northwesterly (290-degree, deep-water)
    swell (with an 8- to 11-second period) is forecast along
    our coastline on Saturday into Tuesday.

    Combined with this west-northwesterly swell will be 3- to
    5-foot southerly (195-degree, shallow-water) seas on Sunday
    into Monday.

    Arriving from the Southern Hemisphere:

    A 1- to 2-foot Southern Hemisphere swell (with a
    20- to 22-second period) will arrive along our
    coastline on Monday, increasing to 2 to 4 feet (with
    an 18- to 20-second period) on Tuesday.

   ATMOSPHERIC CONDITIONS:

    The pattern of moderate to fresh (13 to 24 mph) Santa
    Lucia (northeasterly) winds developing during the
    morning, shifting and increasing out of northwest to
    strong to gale-force (25 to 38 mph) levels during the
    afternoon will continue through Friday.

    Note: At this time of the year, when the winds shift
          out of the northeast (Santa Lucia/offshore)
          and blow from the land out to the ocean, they
          transport pollens from the grasses and tress
          in the inland valleys and mountains toward
          the sea. At times like these, communities
          throughout the Central Coast will experience
          higher pollen counts.

    Clear skies and above normal temperatures will continue
    with the coastline reaching the 60s and 70s in the
    coastal and interior valleys.

    Saturday will be a transition day with decreasing winds
    and increasing clouds as a 1,006 millibar low-pressure
    system and associated cold front moves southward
    down the California coastline.

    This storm is forecast to move over the Central Coast
    on Sunday with strong to gale-force (25 to 38 mph)
    southerly winds and moderate to heavy rain. An upper-
    level trough will follow on Monday with convective
    rain showers and a chance of thunderstorms. Snow
    levels will drop to around 3,500 to 4,000 feet
    with 1 and 3 feet of new snow accumulation possible
    across higher elevations of the Sierra Nevada through
    Monday.  

    Total rainfall on Sunday into Monday is expected to
    range between 1 and 2 inches.

    This wet and cooler weather pattern may continue into
    next Tuesday and Wednesday as the surface low-pressure
    system lingers off the coastline. Over this period,
    dense valley fog may develop.

   WILDFIRE INDEX RATINGS:

    The PG&E Fire Index Ratings will be at low (R1) to
    medium (R2) levels along the Coastline, Coastal and
    Inland Valleys and Far Inland Areas today and Friday,
    decreasing to low (R1) levels this weekend.

  DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA:

         Yesterday's          Today's           Tomorrow's
         Min    Max         Min    Max         Min     Max
        54.3°   60.4°      50.1°   62.0°      52.0°    61.0°

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

    Inland Temperatures, Paso Robles

     Actual                    Predicted
              
     Wed      Thu    Fri    Sat    Sun    Mon    Tue    Wed    Thu
    46 71    36 70  37 69  41 68  48 58  44 56  40 59  40 62  43 63       
       
   Coastal Valleys Temperatures, San Luis Obispo

     Wed      Thu    Fri    Sat    Sun    Mon    Tue    Wed    Thu
    45 65    42 70  43 66  42 65  51 59  47 56  43 59  44 60  46 61      
                    
  WINDS:

    Strong to gale-force (25 to 38 mph) afternoon northwesterly winds
    are forecast today through Friday, decreasing to fresh to strong
    (19 to 31 mph) levels on Saturday.

    Strong to gale-force (25 to 38 mph) southerly winds are forecast
    on Sunday, decreasing to fresh to strong (19 to 31 mph) levels
    by Monday.

  DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

     Today's Maximum Winds:
 
        Max peak winds:       NE           39.0 mph @   7:15 a.m.
        Max sustained wind:   NE           15.0 mph @   7:15 a.m.

     Yesterday's Maximum Winds:       
        
        Max peak winds:       NW           44.0 mph @   5:30 p.m.
        Max sustained wind:   NW           34.0 mph @   5:30 p.m.

  SEAWATER TEMPERATURES:

     Strong to gale-force (25- to 38-mph) spring time northwesterly
     winds have produced frigid seawater temperatures along the
     coastline. Seawater temperatures at the Diablo Canyon Marina
     dropped to 50 degrees this morning.

     Because of the Coriolis Effect, the surface water flows to the
     right, or offshore. This, in turn, causes upwelling along the
     coast as cold, clear and nutrient-rich water rises from the
     ocean’s depths to the surface along the immediate shoreline
     to replace the shallow water that is pushed out to sea.

     Intake seawater temperatures will range from 50 and 53 degrees
     through today, decreasing to 49 and 52 degrees on Friday into
     Saturday. Seawater temperatures will warm on Sunday into
     Monday.

  OCEAN CURRENTS:

     A southerly (offshore) flowing current is forecast to flow
     southward through Saturday, becoming a northerly (onshore)
     flowing current on Sunday into Monday.
 
  SEAWATER VISIBILITY:

     Seawater visibility was 6 to 8 feet at the Diablo Canyon Marina.

==========================================================================
24-Hour Ocean Condition Outlook for Thursday 04/02 to Friday 04/03

  SEA/SWELL:        DIR. NW      HT.  6-8   PER.  7-11  This morning
  Remaining  at:    DIR. NW      HT.  6-8   PER.  7-11  This afternoon
  Remaining  at:    DIR. NW      HT.  6-8   PER.  7-11  Tonight

  WINDS:            DIR. NE      SPEED 15-20 + 35       This morning
  Increasing to:    DIR. NW      SPEED 30-35 + 45       This afternoon
  Decreasing to:    DIR. NW      SPEED 20-25 + 30       Tonight
==========================================================================
48-Hour Ocean Condition Outlook for Friday 04/03 to Saturday 04/04
   
  SEA/SWELL:        DIR. NW      HT.  6-8   PER.  7-11  Friday morning
  Remaining  at:    DIR. NW      HT.  6-8   PER.  7-11  Friday afternoon
  Remaining  at:    DIR. NW      HT.  6-8   PER.  7-11  Friday night

  WINDS:            DIR. NE      SPEED 15-20 + 30       Friday morning
  Increasing to:    DIR. NW      SPEED 30-35 + 45       Friday afternoon
  Decreasing to:    DIR. NW      SPEED 20-25 + 30       Friday night
==========================================================================

Extended Ocean Condition Outlook:

    A storm is forecast to move over the Central Coast
    on Sunday with strong to gale-force (25 to 38 mph)
    southerly winds and moderate to heavy rain. An upper-
    level trough will follow on Monday with convective
    rain showers and a chance of thunderstorms. Total
    rainfall on Sunday into Monday is expected to range
    between 1 and 2 inches.
 
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