Pismo Beach Ocean / Surf Report

9/23/2020 

 SEA/SWELL:

   Increasing northwesterly winds off the California coastline
   will generate a 4- to 6-foot northwesterly (310-degree, deep-
   water) sea and swell (with a 5- to 11-second period) today
   through Thursday morning.

   A Gulf of Alaska storm will generate a 7- to 9-foot northwesterly
   (305-degree, deep-water) sea and swell (with a 6- to 17-second
   period) on Thursday afternoon and night, peaking at 8 to 10 feet
   (with a 6- to 16-second period Friday. This northwesterly sea
   and swell will decrease to 7 to 9 feet (with a 7- to 14-second
   period) on Saturday.

   This sea and swell will become a 6- to 8-foot northwesterly
   (300-degree, deep-water) swell (with an 8- to 11-second period)
   on Sunday, decreasing to 4 to 6 feet (with an 8- to 10-second
   period) on Monday through Tuesday.

   Arriving from the Southern Hemisphere:

   Today's 1- to 3-foot Southern Hemisphere (215-degree, deep-water)
   swell (with a 15- to 17-second period) will remain at this
   height but with a gradually shorter period through Thursday.  

   A 1- to 2-foot Southern Hemisphere (210-degree, deep-water)
   swell (with a 21- to 23-second period) will arrive along our
   coastline on Sunday, increasing to 2- to 3-feet (with an 18-
   to 20-second period) on Monday through Tuesday.

  ATMOSPHERIC CONDITIONS:

   Gentle to moderate (8 to 18 mph) Santa Lucia (northeasterly)
   winds this morning, followed by fresh to strong (19 to 31 mph)
   northwesterly winds this afternoon will continue to
   produce mostly clear skies. These Santa Lucia winds will also
   create warmer temperatures with the beaches reaching the 70s,
   the coastal valleys the 80s, and inland valleys the 90s today
   and tomorrow.

   Note: A cold front will produce rain in far Northern California
         tonight into Thursday morning. This low pressure system
         will be dry when it reaches the Central Coast later on
         Thursday.

   A ridge of high pressure will build across the West Coast later
   on Thursday and is forecast to reach 592 dm by Saturday. Over
   this period, moderate to fresh (13 to 24 mph) Santa Lucia
   (northeasterly) winds are expected during the morning and
   warmer temperatures throughout the Central Coast. High
   temperatures are forecast climb to triple-digit levels in
   the coastal and inland valleys and 80s along the beaches
   by Saturday.

   Gentle to moderate (8 to 18 mph) variable winds are forecast on
   Sunday through Tuesday, which will allow the marine layer to
   redevelop along the coastline and bring cooler temperatures to
   the beaches. Away from the immediate coastline, the early-
   autumn heat wave will continue to produce widespread high 90s
    to low 100s in the coastal and inland valleys on Sunday
    through Tuesday.

    Temperatures will start to drop off next Wednesday, Thursday
    and Friday as the upper-level high-pressure ridge responsible
    for the autumn heat wave starts to break down and strong to
    gale-force (25 to 38 mph) northwesterly winds develop along
    the coastline.

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

    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 today
    and Thursday.

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

   DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA:
 
         Yesterday's          Today's           Tomorrow's
         Min    Max         Min    Max         Min     Max
        53.4°   56.8°      53.1°   70.0°      57.0°    76.0°         
 
   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     Wed     
    49 96    51 97   52 94  50 91  48 100 50 103 53 105 53 104  58 101   
        
   Coastal Valleys Temperatures, San Luis Obispo
 
     Tue      Wed     Thu    Fri    Sat    Sun    Mon    Tue     Wed           
    53 77    53 86   55 87  56 90  54 100 57 96  59 98  58 96   60 91     
                    
   WINDS:

    Fresh to strong (19 to 31 mph) northwesterly winds will develop
    this afternoon, decreasing and shifting out of the north tonight.

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

    Gentle to moderate (8 to 18 mph) variable winds are forecast on
    Sunday through Tuesday, increasing out of the northwest next
    Wednesday and Thursday.
 
   DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:
 
     Today's Maximum Winds:
 
        Max peak winds:         NE    7.0 mph @  8:45 a.m.
        Max sustained wind:     NE    5.0 mph @  8:45 a.m.
 
     Yesterday's Maximum Winds:       
        
        Max peak winds:         NW   23.0 mph @  6:30 p.m.
        Max sustained wind:     NW   17.0 mph @  6:30 p.m.
 
   SEAWATER TEMPERATURES:
 
     Seawater temperatures will range between 55 and 58 degrees
     through today, decreasing to 53 to 56 degrees on Thursday
     through Monday.
 
   OCEAN CURRENTS:

     A southerly (offshore) flowing current is forecast to continue
     to flow southward through Monday.

   SEAWATER VISIBILITY:
 
     Seawater visibility was 19 to 21 feet at the Diablo Canyon Marina.

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24-Hour Ocean Condition Outlook for Wednesday 09/23 to Thursday 09/24

  SEA/SWELL:        DIR. NW      HT.  4-6   PER.  5-11  This morning
  Remaining  at:    DIR. NW      HT.  4-6   PER.  5-11  This afternoon
  Remaining  at:    DIR. NW      HT.  4-6   PER.  5-11  Tonight

 (Combined with:    DIR. S       HT.  1-3   PER. 15-17  All day)

  WINDS:            DIR. NW      SPEED  5-10            This morning
  Increasing to:    DIR. NW      SPEED 20-25 + 30       This afternoon
  Decreasing to:    DIR. N       SPEED  5-10            Tonight
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48-Hour Ocean Condition Outlook for Thursday 09/24 to Friday 09/25
   
  SEA/SWELL:        DIR. NW      HT.  4-6   PER.  5-11  Thursday morning
  Increasing to:    DIR. NW      HT.  7-9   PER.  6-17  Thursday afternoon
  Remaining  at:    DIR. NW      HT.  7-9   PER.  6-16  Thursday night

 (Combined with:    DIR. S       HT.  1-3   PER. 14-16  All day Thursday)

  WINDS:            DIR. NE      SPEED 10-15 + 25       Thursday morning
  Increasing to:    DIR. NW      SPEED 25-30 + 35       Thursday afternoon
  Decreasing to:    DIR. N       SPEED 10-15            Thursday night
==========================================================================
 
 Extended Ocean Condition Outlook:
 
    The northwesterly winds will decrease on Sunday through Tuesday.

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