Pismo Beach Ocean / Surf Report

9/20/2019

 

SEA/SWELL:

      Today's 4- to 6-foot northwesterly (310-degree, deep-water)
      sea and swell (with a 7- to 12-second period) will remain
      at this level through Saturday.

      A 5- to 7-foot northwesterly (305-degree, deep-water)
      sea and swell (with a 5- to 11-second period) will arrive
      along our coastline on Sunday into Monday morning, building
      to 6 to 8 feet (with a 7- to 14-second period) Monday
      afternoon through Tuesday.

      A 6- to 8-foot northwesterly (310-degree, deep-water)
      swell (with an 11- to 20-second period) will arrive
      along our coastline on Wednesday, increasing to 8 to 10
      feet (with an 8- to 16-second period) next Thursday and
      Friday.

      Arriving from the Southern Hemisphere:

      A 1- to 2-foot Southern Hemisphere (210-degree, deep-
      water) swell (with a 16- to 20-second period) is
      forecast along our coastline on Saturday through Monday.
       
      A 1- to 3-foot Southern Hemisphere (220-degree, deep-
      water) swell (with an 18- to 21-second period) is
      forecast along our coastline next Friday and Saturday.  

   ATMOSPHERIC CONDITIONS:

      This morning's Santa Lucia (northeasterly) winds produced
      clear and warm September skies throughout the Central
      Coast.

      High pressure over Central California will continue to
      produce gentle to moderate (8 to 18 mph) Santa Lucia
      (northeasterly) winds during the morning, and fresh
      to strong (19 to 31 mph) northwesterly winds during
      the afternoon through Sunday.

      The Santa Lucia winds during the morning will keep the
      marine layer out to sea, while fresh to strong (19 to
      31 mph) afternoon northwesterly winds along the shoreline
      will keep temperatures from getting to warm.

      Today's high temperatures will reach to the high 80s in
      the North County and low 80s in the coastal valleys.
      The beaches will range between the high 60s to the
      low 70s.

      Warming continues through Saturday as high pressure
      builds, with Paso Robles reaching the mid 90s and
      San Luis Obispo the high 80s.

      Fresh to strong (19 to 31 mph) northwesterly winds
      and night and morning marine low clouds with areas
      of fog and mist will develop on Monday and Tuesday.

      This morning's model runs continue to indicate
      significant amounts of monsoon moisture moving
      northward into the Central Coast later on Tuesday
      through Wednesday with southerly winds, mid to high-
      level clouds, humidity, and a chance of rain and
      thunderstorms.

      A Gulf of Alaska low pressure system and associated
      cold front is expected to approach the Central Coast
      next Thursday and Friday with increasing clouds, cooler
      temperatures and perhaps rain.   

   WILDFIRE INDEX RATINGS:

      The PG&E Fire Index Ratings will be at medium levels (R2)
      along the Coastline and high (R3) to very high (R4)
      levels in the Coastal and Inland valleys and Far Inland areas
      today.
   
  DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA:

         Yesterday's          Today's           Tomorrow's
         Min    Max         Min    Max         Min     Max
        56.2°   66.7°      58.1°   68.0°      57.0°    67.0°

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

    Inland Temperatures, Paso Robles

   Actual                    Predicted
           
      Thu     Fri     Sat    Sun     Mon    Tue   Wed   Thu   Fri
     56 81   56 89   59 93  60 89   62 91  64 98 62 96 62 86 60 84      
                                                               
   Coastal Valleys Temperatures, San Luis Obispo
        
      Thu     Fri     Sat    Sun     Mon    Tue   Wed   Thu   Fri
     53 76   52 81   54 88  55 86   54 78  56 85 57 84 56 76 56 73   
                        
  WINDS:

     A pattern of gentle to moderate (8 to 18 mph) Santa Lucia
     (northeasterly) winds developing during the morning,
     shifting out of the northwest and increasing to fresh to
     strong (19 to 31 mph) levels during the afternoon will
     will continue through Sunday.

     Fresh to strong (19 to 31 mph) northwesterly winds are
     forecast Monday and Tuesday.

     Increasing southerly winds are expected on Tuesday through
     next Friday.

  DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

     Last night's Maximum Winds:
 
        Max peak winds:       NW         17.0 mph @   6:45 a.m.
        Max sustained wind:   NW          9.0 mph @   6:45 a.m.

     Yesterday's Maximum Winds:
           
        Max peak winds:       NW         42.0 mph @   8:00 p.m.
        Max sustained wind:   NW         28.0 mph @   8:00 p.m.

  SEAWATER TEMPERATURES:

     Intake seawater temperatures will range from 54 to 57 degrees
     through Monday, increasing on Tuesday through next Friday.
 
  OCEAN CURRENTS:

     A southerly (offshore) flowing current will continue through
     Monday, becoming a northerly (onshore) flowing current on
     Tuesday through next Friday.
 
  SEAWATER VISIBILITY:

     Seawater visibility was 5 to 7 feet at the Diablo Canyon Marina.

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24-Hour Ocean Condition Outlook for Friday 09/20 to Saturday 09/21
 
  SEA/SWELL:        DIR. NW      HT.  4-6   PER.  7-12  This morning
  Remaining  at:    DIR. NW      HT.  4-6   PER.  7-12  This afternoon
  Remaining  at:    DIR. NW      HT.  4-6   PER.  7-12  Tonight

  WINDS:            DIR. NE      SPEED 10-15            This morning
  Increasing to:    DIR. NW      SPEED 20-25 + 35       This afternoon
  Decreasing to:    DIR. N       SPEED 15-20            Tonight
==========================================================================
48-Hour Ocean Condition Outlook for Saturday 09/21 to Sunday 09/22
    
  SEA/SWELL:        DIR. NW      HT.  4-6   PER.  7-12  Saturday morning
  Remaining  at:    DIR. NW      HT.  4-6   PER.  7-12  Saturday afternoon
  Remaining  at:    DIR. NW      HT.  4-6   PER.  7-12  Saturday night

 (Combined with:    DIR. S       HT.  1-2   PER  16-20  All day Saturday)

  WINDS:            DIR. NE      SPEED 10-15            Saturday morning
  Increasing to:    DIR. NW      SPEED 20-25 + 35       Saturday afternoon
  Decreasing to:    DIR. N       SPEED 15-20            Saturday night
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Extended Ocean Condition Outlook:
 
  Increasing southerly winds are expected on Tuesday through next Friday.

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