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.
==========================================================================
