Pismo Beach Ocean / Surf Report

10/19/2020 

SEA/SWELL:

   Today’s 2- to 4-foot northwesterly (310-degree, deep-water)
   swell (with an 8- to 11-second period) will increase to 3
   to 5 feet Tuesday and 4 to 6 feet on Wednesday with the same
   period.

   This northwesterly (310-degree, deep-water) swell will further
   build to 6- to 8-feet (with an 8- to 12-second period) on
   Thursday, decreasing to 5 to 7 feet on Friday and 4 to 6 feet
   by Saturday.

   A 4- to 6-foot northwesterly (300-degree, deep-water) swell
   (with an 18- to 20-second period) is forecast to arrive along
   our coastline on Sunday through next Monday.

   Arriving from the Southern Hemisphere:

   A 1- to 3-foot Southern Hemisphere (185-degree, deep-water)
   swell (with an 18- to 20-second period) will arrive along our
   coastline on Tuesday and remain at this height, but with
   gradually shorter period through Thursday.  

  ATMOSPHERIC CONDITIONS:

   Last week gusty Santa Lucia (northeasterly) winds produced
   record-breaking high temperatures throughout the Central
   Coast and mostly clear skies, except for variable amounts
   of smoke.

   This week persistent northwesterly to southeasterly (onshore)
   winds will create near seasonal temperatures and marine low
   clouds with areas of night and morning mist and fog with
   afternoon clearing in the coastal regions.

   The marine layer is expected to deepen and move farther
   inland on Tuesday into Wednesday. Over this period, high
   temperatures will cool to the low-90s in the inland valleys
   (Paso Robles), low 80s in the coastal valleys (San Luis
   Obispo) and 60s along the beaches.

   A 1,010 millibar surface low-pressure system will move
   southward down the California coastline later on Thursday
   through Saturday. This system will produce gentle to
   moderate (8 to 18 mph) southeasterly (onshore) winds,
   a deep marine layer and areas of drizzle/light rain and
   cooler temperatures.

   WILDFIRE INDEX RATINGS:
 
    COASTAL: FIA 508
    INLAND:  FIA 497, 510, 575, 580, 582 and 590

    The PG&E Fire Index Ratings will be at medium (R2)
    levels along the Coastline, and high (R3) levels in
    the Coastal Valleys. The Inland Valleys and Far Inland
    Areas will be at very high (R4) levels today.

    The PG&E Fire Index Ratings will be at high (R3) levels
    along the Coastline, and very high (R4) levels in the
    Coastal and Inland Valleys and Far Inland Areas on Tuesday
    and Wednesday.

   DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA:
 
         Yesterday's          Today's           Tomorrow's
         Min    Max         Min    Max         Min     Max
        53.1°   58.4°      52.0°   60.0°      53.0°    60.0°         
 
   PG&E Weather Office in San Francisco predicted temperatures
   for San Luis Obispo County
 
    Inland Temperatures, Paso Robles
 
    Actual                       Predicted
              
      Sun     Mon    Tue    Wed     Thu    Fri   Sat   Sun   Mon
     50 98   47 91  48 91  48 91   48 82  50 79 48 79 45 78 42 83                 
        
   Coastal Valleys Temperatures, San Luis Obispo
 
      Sun     Mon    Tue    Wed     Thu    Fri   Sat   Sun   Mon
     50 85   53 780  54 82 54 80   54 74  57 72 54 72 52 70 50 74            
                    
   WINDS:

    A pattern of moderate to fresh (13 to 24 mph) northwesterly winds
    developing during the afternoon, decreasing during the night
    and morning will continue through Thursday.

    Gentle to moderate (8 to 18 mph) southeasterly winds are forecast
    Thursday night through Saturday.

    A pattern of moderate to fresh (13 to 24 mph) northwesterly winds
    developing during the afternoon, decreasing during the night
    and morning will start Saturday and will continue through next
    Monday.

   DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:
 
     Today's Maximum Winds:
 
        Max peak winds:         SE   16.0 mph @  9:15 a.m.
        Max sustained wind:     SE   11.0 mph @  9:15 a.m.
 
     Yesterday's Maximum Winds:       
        
        Max peak winds:         NW   22.0 mph @  4:45 p.m.
        Max sustained wind:     NW   18.0 mph @  4:45 p.m.
 
   SEAWATER TEMPERATURES:
 
     Seawater temperatures will range between 56 and 59 degrees
     through Thursday, increasing on Friday through Saturday
     to 58 and 62 degrees.  
     
   OCEAN CURRENTS:

     A pattern of a southerly (offshore) flowing current developing
     during the afternoon, becoming a northerly (onshore) flowing
     current during the night and morning will continue through
     Thursday.

     A northerly (onshore) flowing current is forecast on Friday
     through Saturday.

   SEAWATER VISIBILITY:
 
     Seawater visibility was not available today.

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24-Hour Ocean Condition Outlook for Monday 10/19 to Tuesday 10/20

  SWELL:            DIR. NW      HT.  2-4   PER.  8-11  This morning
  Remaining  at:    DIR. NW      HT.  2-4   PER.  8-11  This afternoon
  Remaining  at:    DIR. NW      HT.  2-4   PER.  8-11  Tonight

 (Combined with:    DIR. S       HT.  1-2   PER  13-15  All day)

  WINDS:            DIR. SE      SPEED  5-10            This morning
  Increasing to:    DIR. NW      SPEED 10-15 + 20       This afternoon
  Decreasing to:    DIR. SW      SPEED  5-10            Tonight
==========================================================================
48-Hour Ocean Condition Outlook for Tuesday 10/20 to Wednesday 10/21
   
  SWELL:            DIR. NW      HT.  3-5   PER.  8-11  Tuesday morning
  Remaining  at:    DIR. NW      HT.  3-5   PER.  8-11  Tuesday afternoon
  Remaining  at:    DIR. NW      HT.  3-5   PER.  8-11  Tuesday night

 (Combined with:    DIR. S       HT.  1-3   PER  18-20  All day Tuesday)

  WINDS:            DIR. N       SPEED  5-10            Tuesday morning
  Increasing to:    DIR. NW      SPEED 15-20 + 25       Tuesday afternoon
  Decreasing to:    DIR. NW      SPEED  5-10            Tuesday night
==========================================================================
 
 Extended Ocean Condition Outlook:
 
     Gentle to moderate (8 to 18 mph) southeasterly winds are forecast
     Thursday night through Saturday.

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