Pismo Beach Ocean / Surf Report

1/18/2021

 SEA/SWELL:

    Today's 10- to 12-foot northwesterly (290-degree, deep-water)
    swell (with an 18- to 20-second period) is forecast to remain
    at this level through tonight, decreasing to 8 to 10 feet
    (with a 15- to 17-second period) by Tuesday morning. This
    swell will further lower to 5 to 7 feet (with an 8- to 14-
    second period) by Tuesday night.

    A 4- to 6-foot northwesterly (300-degree, deep-water) swell
    (with an 8- to 18-second period) will arrive along our
    coastline on Wednesday and remain at this level through
    Thursday.

    Gale-force northwesterly winds along the California Coastline
    will generate a 10- to 12-foot northwesterly (310-degree,
    deep-water) sea and swell (with a 7- to 17-second period)
    on Friday and remain at this level through Sunday.

  ATMOSPHERIC CONDITIONS:

    Moderate to fresh (13 to 24 mph) and at times gusty Santa
    Lucia (northeasterly) winds are forecast on Martin Luther
    King Jr. Day, along with above average January temperatures.

    A surface low-pressure system near Point Conception will
    intensify to 1,001 millibars (mb) as it moves southward
    due to a vigorous jet stream powered by a 547 decameter
    upper-level low. At this same time, a 1,040 mb ridge of
    high-pressure will develop over the Great Basin and will   
    create a steep pressure gradient that will produce moderate
    gale-force to fresh gale-force (32 to 46 mph) easterly
    winds with local gusts of 60 mph in the coastal passes,
    gaps, canyons, and ridgetops on Tuesday.

    During this period, a powerful Santa Ana event wind event is
    forecast in Southern California. Unfortunately, rain is not
    expected to accompany this low-pressure system, only passing
    high-level clouds.

    The easterly winds will turn out of the northeast (Santa Lucia)
    on Tuesday night into Thursday morning and decrease to strong
    to gale-force (25 to 38 mph) levels.

    Gentle to moderate (8 to 18 mph) northwesterly winds are
    forecast on Thursday afternoon through Friday. The
    northwesterly winds will increase to fresh to strong (19
    to 31 mph) levels on Saturday. These winds will allow the
    marine layer with fog and mist to develop in the coastal
    regions and will bring much cooler temperatures to the
    Central Coast.

    Some of the longer-range models are advertising unsettled
    weather with a chance of rain developing on January 25 and
    26.

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

    The PG&E Fire Index Ratings will be at extremely high
    (R5) levels along our Coastline, in the Coastal and
    Inland Valleys and the Far Inland areas, expect for
    FIA 590 which will be a very high (R4) levels
    today, Tuesday and Wednesday.

   DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA:
 
         Yesterday's          Today's           Tomorrow's
         Min    Max         Min    Max         Min     Max
        59.3°   74.1°      54.5°   65.0°      51.0°    63.0°
 
   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
      38 78   37 78  33 68  32 73  33 69  34 59  29 58  27 60  32 59  
        
   Coastal Valleys Temperatures, San Luis Obispo
 
       Sun     Mon    Tue    Wed    Thu    Fri    Sat    Sun    Mon
      50 86   44 82  46 74  48 77  44 72  42 59  43 57  41 63  42 61  
                    
   WINDS:

    Moderate gale-force to fresh gale-force (32 to 46 mph) easterly
    winds with local gusts of 60 mph in the coastal passes,
    gaps, canyons, and ridgetops will develop on Tuesday.

    The easterly winds will turn out of the northeast (Santa Lucia)
    on Tuesday night into Thursday morning and decrease to strong
    to gale-force (25 to 38 mph) levels.

    Gentle to moderate (8 to 18 mph) northwesterly winds are
    forecast on Thursday afternoon through Friday. The
    northwesterly winds will increase to fresh to strong (19
    to 31 mph) levels on Saturday.

   DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:
 
     Today's Maximum Winds:
 
        Max peak winds:         NE   20.0 mph @ 10:00 a.m.
        Max sustained wind:     NE   13.0 mph @ 10:00 a.m.
 
     Monday's Maximum Winds:       
        
        Max peak winds:         NE   30.0 mph @  1:30 a.m.
        Max sustained wind:     NE   19.0 mph @  0:45 a.m.
 
   SEAWATER TEMPERATURES:
 
     Seawater temperatures will range between 53 and 55 degrees
     through next Monday.

   OCEAN CURRENTS:

     Today's southerly (offshore) flowing current will continue
     to flow southward through next Monday.

   SEAWATER VISIBILITY:
 
     Seawater visibility was not available today.

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24-Hour Ocean Condition Outlook for Monday 01/18 to Tuesday 01/19

  SWELL:            DIR. NW      HT. 10-12  PER. 18-20  This morning
  Remaining  at:    DIR. NW      HT. 10-12  PER. 18-20  This afternoon
  Remaining  at:    DIR. NW      HT. 10-12  PER. 17-19  Tonight

  WINDS:            DIR. NE      SPEED 15-20 + 30       This morning
  Decreasing to:    DIR. NW      SPEED 10-15            This afternoon
  Increasing to:    DIR. NE      SPEED 25-30 + 45       Tonight
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48-Hour Ocean Condition Outlook for Tuesday 01/19 to Wednesday 01/20
   
  SWELL:            DIR. NW      HT.  8-10  PER. 15-17  Tuesday morning
  Decreasing to:    DIR. NW      HT.  6-8   PER. 11-15  Tuesday afternoon
  Decreasing to:    DIR. NW      HT.  5-7   PER.  8-14  Tuesday night

  WINDS:            DIR. E       SPEED 35-45 + 60       Tuesday morning
  Remaining  at:    DIR. E       SPEED 35-45 + 60       Tuesday afternoon
  Decreasing to:    DIR. NE      SPEED 25-30 + 45       Tuesday night
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 Extended Ocean Condition Outlook:

  Higher-energy swell events will continue into the fourth week of 2021.

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