============= PG&E DCPP
Weather Forecast for Friday 05/09/08 =============
SEA/SWELL:
(northern hemisphere)
This
morning's 6 to 8 foot northwesterly (285°) sea/swell (with
a
5-11 second period) will continue at this height and period
through tonight.
A
5 to 7 foot northwesterly (285°) sea/swell (with a 7-9 second
period) will develop along our coastline on Saturday, decreasing
to 3
to 5 feet by Sunday morning.
Increasing northwesterly winds off the northern and central
California coastline will produce a 4 to 6 foot northwesterly
(290°) sea/swell (with a 7-11 second period) on Sunday afternoon,
further building to 6 to 8 feet on Monday morning.
This
northwesterly sea/swell will peak on Monday afternoon through
Monday night at 8 to 10 feet (with a 7-11 second period).
A
6 to 8 foot northwesterly swell (with a 9-11 second period)
will
develop along our coastline on Tuesday, further lowering
to 3
to 4 feet (with a 9-15 second period) on Wednesday and will
continue at this height and period through next Friday.
(southern hemisphere)
A 1
foot southern hemisphere (190°) swell (with a 16-18 second
period) is expected to arrive along our coastline on Saturday,
increasing to 2 to 3 feet (with 15-18 second period) on Sunday
through Tuesday.
ATMOSPHERIC CONDITION:
The onshore flow will continue to produce night and morning coastal
low
clouds and fog, becoming partly to mostly clear and windy along
our
coastline by this afternoon. Farther inland the marine layer
will
clear much faster with mostly sunny skies developing by the
late morning
and afternoon hours.
Temperatures today should reach the high 70s to low 80s in our
inland areas while our coastal valleys will reach the 60s.
Along
our coastline temperatures will only reach the high 50s.
All
of our areas will warm-up a couple degrees over the weekend.
A
weak upper-level trough will cross our area late Saturday, which
will
slightly weaken the northwesterly winds (onshore flow) and give
a
deeper marine layer on Saturday night through Sunday morning with
a few
areas of drizzle developing along our coastline.
This upper-level trough will be followed by strong to gale force
(25-38 mph) northwesterly winds on Sunday afternoon through Monday
and a
decreasing marine layer.
A
strong area of high pressure will build over the western U.S. late
next
week for an extended period of warm to hot weather, mostly clear
and
sunny skies and gentle winds. Some of our inland areas may hit
to
100 mark for the first time this year by next Friday and Saturday.
DIABLO CANYON AIR
TEMPERATURES:
Diablo Canyon Meteorological Tower Air Temperature Data
Yesterday's
Today's
Tomorrow's
Min Max
Min Max
Min Max
49.3° 53.7° 48.1°
55.0° 49.0° 55.0°
PG&E San
Francisco Met Office predicted temps:
Inland Temperatures, Paso Robles
Thu Fri Sat Sun Mon
Tue Wed
40 79 41 82 43 80 44 75 41 81 42 85 45 89
Inland Temperatures, San Luis Obispo
Thu Fri Sat Sun Mon
Tue Wed
45 67 44 72 46 67 47 67 46 69 46 76 46 78
WINDS:
This
morning's gentle to moderate northwesterly winds will
increase to strong to gale force (25-38 mph) levels this
afternoon, decreasing tonight.
Fresh to strong (19-31 mph) northwesterly winds are forecast on
Saturday through Sunday.
The northwesterly winds will increase to strong to gale force
(25-38 mph) levels on Monday through Tuesday, then decreasing
late
next week.
DIABLO CANYON
METEOROLOGICAL TOWER WIND DATA:
Today's winds:
Max peak winds: NW 13.0 mph at 06:00
Max sustained wind: NW 8.9 mph at 06:00
Yesterday's Winds:
Max peak winds: NW 38.4 mph at 13:45
Max sustained wind: NW 31.4 mph at 13:45
SEAWATER TEMPERATURES:
The seawater temperature recorder at station 19-10 in Patton Cove
along
the Diablo Canyon coastline was swapped-out on Friday.
The
average seawater temperature for the month of April was 49.52
degrees F which was the coldest monthly average temperature for
any
month since temperatures records have been kept at The Diablo
Canyon Ocean Lab (1976). On the 22nd of April the water temperature
reached a low of 47.35 degrees which was the lowest single water
temperature ever recorded at station 19-10.
Intake seawater temperatures will range between 48° and 51° today
through Tuesday, increasing late next week.
SEAWATER VISIBILITY:
Seawater visibility was 18 to 20 feet at the Diablo Canyon Intake.
==========================================================================
24-Hour Ocean Condition
Outlook for Friday 05/09 to Saturday 05/10
Sea/Swell DIR. NW
HT. 6-8 PER. 5-11 This morning
Remaining
at: DIR. NW HT. 6-8 PER.
5-11 This afternoon
Remaining
at: DIR. NW HT. 6-8 PER.
5-11 Tonight
WINDS: DIR.
NW SPEED
10-15
This morning
Increasing to:
DIR. NW SPEED 25-30 +
40 This afternoon
Decreasing to:
DIR. NW SPEED 20-25 +
30 Tonight
==========================================================================
48-Hour Ocean Condition
Outlook for Saturday 05/10 to Sunday 05/11
Sea/Swell DIR. NW
HT. 5-7 PER. 7-9 Saturday
morning
Remaining
at: DIR. NW HT. 5-7 PER.
7-9 Saturday afternoon
Remaining
at: DIR. NW HT. 5-7 PER.
7-9 Saturday night
WINDS: DIR.
NW SPEED
10-15
Saturday morning
Increasing to:
DIR. NW SPEED 20-25 +
30 Saturday afternoon
Decreasing to:
DIR. NW SPEED
15-20
Saturday night
=======================================================================
Extended Ocean Condition
Outlook:
Increasing
northwesterly winds and sea/swell on Sunday afternoon
through Monday.
==========================================================================
The 24 - Hour Ocean
Data >From The Diablo Canyon Wave rider Buoy
MONTH DAY
TIME SIG.HEIGHT PERIOD SWELL
DIRECTION SST
(PST) (FEET) (SECONDS)
(TRUE) (DEG. F)
05 05 1304
6.1
13
274 52.3
05 06 0334
3.3
11
285 49.3
05 07 0334
4.4
13
275 50.4
05 08 0434
5.8
11
284 50.4
05 09 0434
6.6
11
279 50.9
DCPP Ocean Lab Waverider Buoy Energy Spectral Analysis
mo day time
sig.ht.
sig.per.
energy (cm.sq.)
(cm) (sec) 22+ 20 17
15 13 11
9 7
----------------------------------------------------------------------
05 05 1304
185 11 1
5 20 117 415
697 524 192
05 06 0334
100 9 0
2 6 55
39 128 165 151
05 07 0334
133 9 0
3 15 78 232
104 293 204
05 08 0434
176 11 0
1 4 19
99 607 497 331
05 09 0434
200 9 1
1 1 8
51 457 758 699
Daily Swell Inspection
Program
NAME
DAY TIME HEIGHT PERIOD
SST
(PST) (FEET) (SECONDS) (DEG. F)
# 59 300 Miles west of
SF, Ca 09 0400
6
8 52.0
# 01 Point Reyes
Waverider 09 0423
15
9 47.7
# 42 Monterey Waverider
Buoy 09 0405
7 9
49.3
# 28 Cape San Martin,
Ca 09
0400 12
10 51.6
# 50 DCPP Waverider
Buoy, Ca 09 0434
7 11
50.9
# 71 Harvest Platform,
Ca 09
0403 9
5 50.7
* NOTE: Height (significant
swell height) is the average height of
the waves in the
top third of the wave record. Maximum wave heights
may be up to
TWICE the height in the data shown in the above
table.
Precipitation at the
Diablo Canyon Ocean Lab
Wednesday
15:00 through Thursday 15:00 0.00 inches
Thursday 15:00 through Friday
15:00 0.00 inches
Precipitation this rain
season: 13.33 inches
Average season total to
date: 23.64 inches
Ocean Lab Barometer:
29.92 in/Hg or 1013.1 mb +0.3 mb (Steady)
Sunrise and Sunset:
Today's Sunrise 6:03
AM Sunset 7:56 PM
Tomorrow's Sunrise 6:02
AM Sunset 7:56 PM
Tides:
Low
Tide
High Tide
AM
PM AM
PM
9
Friday 8:27 -1.3 7:41
2.8 12:41 5.9 3:44 3.6
10
Saturday 9:30 -1.0 9:16
2.8 1:43 5.3 4:51 3.8
11
Sunday 10:32 -0.6 10:56
2.5 2:57 4.8 5:47 4.1
12
Monday 11:29 -0.2 -----
--- 4:20 4.3 6:32 4.4
13
Tuesday 12:20 2.0 12:19
0.2 5:44 3.9 7:10 4.7
=========================================================================
This day in weather history
1988 - A massive
cyclone in the central U.S. produced severe
thunderstorms from eastern Texas to the Upper Ohio Valley.
A strong (F-3) tornado ripped through Middleboro KY causing
more than 22 million dollars damage. Thunderstorms in east
central Texas produced hail three and a half inches in
diameter at Groesbeck, and near Fairfield. (Storm Data)
=========================================================================
This weather forecast
is a service provided by Pacific Gas and Electric
Company (PG&E) to
our energy customers. The forecast is valid only for
the Diablo Canyon Power
Plant coastline area (approximately a one-half
mile radius surrounding
the plant). Some of the information in this
forecast is provided by
Pacific Weather Analysis, with their permission.
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