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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