PG&E weather forecast for Tuesday January 25

January 25, 2011

By JOHN LINDSEY from PG&E

SEA SWELL:

Today’s 4 to 6-foot west-northwesterly (285-degree deep-water) swell (with a 14 to 16-second period) will continue at this height and period through tonight.

A 5 to 7-foot west-northwesterly (285-degree deep-water) swell (with a 13 to 17-second period) will arrive along our coastline Wednesday, increasing to 6 to 8-feet (with a 13- to 15-second
period) on Thursday and will remain at this height and period through Friday.

A 5 to 7-foot northwesterly (295-degree deep-water) sea and swell (with a 5 to 15-second period) will develop along our our coastline on Saturday and Sunday

A 4 to 6-foot northwesterly (295-degree deep-water) swell (with an 11 to 13-second period) is forecast along our coastline on Monday through next Tuesday.

PG&E San Francisco Met Office predicted temps:

Inland Temperatures, Paso Robles

Actual                    Predicted

Mon     Tue      Wed      Thu       Fri       Sat       Sun      Mon     Tue
33-73   39-70   40-69   42-69   39-69   39-66   40-63   37-61   37-63

Coastal Valleys Temperatures, San Luis Obispo

Mon     Tue       Wed     Thu     Fri        Sat        Sun     Mon     Tue
42-75   45-74   43-73   42-72   41-72   40-69   40-68   41-69   42-67

ATMOSPHERIC CONDITION:

A few high-level clouds will continue to move over our area this morning, becoming clear by this afternoon. The exception will be the tule fog in the San Joaquin Valley that will persist through the week.

A 1,028-millibar Eastern Pacific High is still parked about 600 miles west-northwest of San Luis Obispo and combined with an area of strong high pressure over the Great Basin will
produce gentle to moderate (8 to 18 mph) and at times gusty northeasterly (offshore) winds during night and morning hours and mostly clear and dry weather through Friday.

High temperatures will range between the high 60s to low 70s in the North County (Paso Robles) and along the northwesterly facing beaches (Morro Bay and Los Osos).

High temperatures in the coastal valleys (San Luis Obispo) and along the southwesterly facing beaches (Avila Beach and Cayucos) will reach the mid-70s.

Increasing northwesterly winds this weekend will produce areas of night and morning marine low clouds and fog along the coastline on Friday night through Sunday. Still no rain in the forecast.

DIABLO CANYON AIR TEMPERATURES:

Diablo Canyon Meteorological Tower Air Temperature Data

Yesterday’s          Today’s           Tomorrow’s
Min    Max        Min    Max         Min     Max
51.9°   72.9°     53.7°   67.0°      52.0     67.0

WINDS:

Gentle to moderate (8 and 18 mph) northeasterly (offshore) winds are forecast today through Thursday, followed by increasing northwesterly winds on Friday through Saturday.

DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

Today’s winds:

Max peak winds:      NE        4.7 mph at   7:30 a.m.
Max sustained wind:  NE        2.3 mph at   7:30 a.m.

Yesterday’s Maximum Winds:

Max peak winds:      NE       36.5 mph at   8:15 p.m.
Max sustained wind:  NE       21.0 mph at   8:15 p.m.

SEAWATER TEMPERATURES:

The Diablo Canyon waverider buoy is reporting a sea surface temperature of 53.4 degrees while the Nortek AWAC current meter is reporting 53.5 degrees.

Intake seawater temperatures will range between 53 and 55 -degrees through tonight, increasing to 54 and 56-degrees on Wednesday and remaining at this range through Friday.

OCEAN CURRENTS:

Both the DCPP Cal Poly CODAR stations and the DCPP Nortek AWAC meter are indicating a northerly (onshore) flowing current.

This northerly (onshore) flowing current will continue to flow northward through Friday.

SEAWATER VISIBILITY:

Seawater visibility was 11 to 13 feet at the Diablo Canyon Intake.

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24-Hour Ocean Condition Outlook for Tuesday 01/25 to Wednesday 01/26

Swell           DIR. WNW     HT.   4-6    PER. 14-16  This morning
Remaining  at:  DIR. WNW     HT.   4-6    PER. 14-16  This afternoon
Remaining  at:  DIR. WNW     HT.   4-6    PER. 13-15  Tonight

WINDS:          DIR. NE      SPEED 10-15              This morning
Decreasing to:  DIR. NE      SPEED  5-10              This afternoon
Increasing to:  DIR. NE      SPEED 10-15              Tonight
===========================================================================
48-Hour Ocean Condition Outlook for Wednesday 01/26 to Thursday 01/27

Swell           DIR. WNW     HT.   4-6    PER. 13-15  Wednesday morning
Increasing to:  DIR. WNW     HT.   5-7    PER. 13-17  Wednesday afternoon
Remaining  at:  DIR. WNW     HT.   5-7    PER. 13-17  Wednesday night

WINDS:          DIR. NE      SPEED 10-15 + 20         Wednesday morning
Decreasing to:  DIR. NE      SPEED  5-10              Wednesday afternoon
Increasing to:  DIR. NE      SPEED 10-15              Wednesday night
===========================================================================
Extended Ocean Condition Outlook:

There are no signs of any rain events for the rest of January and it appears that this month will end up below normal for rainfall after a very wet December.

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The 24 – Hour Ocean Data From The Diablo Canyon Wave rider Buoy
MONTH  DAY  TIME  SIG.HEIGHT   PERIOD   SWELL DIRECTION     SST
01    21    0413     6.0       22+           263          53.2
01    21    1813     8.0       20            268          57.0
01    22    2043     7.9       17            254          54.5
01    23    0443     7.5       18            254          56.3
01    24    0543     6.1       17            253          53.8
01    25    0543     5.1       14            267          53.4

(cm) (sec)  22+   20    17    15    13     11    9    7
———————————————————————–
01 12  0413  184   20   241   505    35   262   244   179   213  235
01 21  0713  170   20   122   623    45   198   173   139   158  178
01 21  1813  243   20    95  1897   587   203   240   151   144  191
01 22  2043  240   17    34   467  1153   756   470   146   124  191
01 23  0443  227   17    27   610   699   643   521   222   116  163
01 24  0543  185   15    11   104   471   498   345   361   136  110
01 25  0543  156   13     3    20   101   378   536   249    61  127

Daily Swell Inspection Program

NAME                      DAY   TIME    HEIGHT   PERIOD     SST
(PST)   (FEET)  (SECONDS) (DEG. F)
# 166  Ocean Station Papa      25    0402      17       13       43.0
# 06   SE Papa                 25    0550       8       15       53.2
# 59   California Buoy         25    0550       6       14       55.8
# 01   Point Reyes Waverider   25    0546       8       15       51.4
# 15   Monterey Waverider Buoy 25    0550       5       13       53.2
# 28   Cape San Martin, Ca     25    0550       6       15       54.1
# 50   DCPP Waverider Buoy, Ca 25    0543       5       14       53.4
# 63   Harvest Buoy            25    0520       6       14       54.9
# 01   NW Hawaii               25    0550      10       12       74.7

* Note: Height (significant swell height) is the average height of the waves in the top third of the wave record. Maximum wave height may be up to TWICE the height in the data shown in the above table.

Precipitation at the Diablo Canyon Ocean Lab.

Saturday   1500 through Sunday     1500   0.00 inches
Sunday     1500 through Monday     1500   0.00 inches

Precipitation this rain season (July 1 – June 30): 17.61 inches
Average season rainfall at DIP to date:            11.28 inches

Ocean Lab Barometer:   30.06 in or 1018.0 mb  +0.0 mb (Steady)

Sunrise and Sunset

Today’s         Sunrise 7:07 AM      Sunset 5:24  PM
Tomorrow’s      Sunrise 7:06 AM      Sunset 5:25  PM

Tides:
Low Tide                 High Tide
AM          PM           AM          PM
25 Tuesday     8:52  1.1    8:02  1.5    2:02 5.4    2:37  3.4
26 Wednesday  10:20  0.7    9:00  2.1    2:57 5.6    4:27  3.1
27 Thursday   11:39  0.2   10:14  2.5    3:58 5.7    6:17  3.2
28 Friday    (12:44 -0.2)  11:32  2.6    5:01 5.8    7:33  3.4
29 Saturday   —–  —-   1:36 -0.5    6:00 5.9    8:24  3.7
30 Sunday     12:39  2.6    2:20 -0.7    6:54 5.9    9:04  3.9
31 Monday      1:33  2.5    2:59 -0.8    7:41 6.0    9:37  4.0
1 Tuesday     2:19  2.3    3:32 -0.7    8:22 5.9   10:06  4.1
=========================================================================
This day in weather history

1821 – The Hudson River was frozen solid during the midst of the coldest winter in forty-one years. Thousands of persons crossed the ice from New York City to New Jersey, and refreshment taverns were set up in the middle of the river to warm pedestrians. (David Ludlum)

1837 – At 7 PM a display of the Northern Lights danced above Burlington, VT. Its light was equal to the full moon. Snow and other objects reflecting the light were deeply tinged with a blood red hue. Blue, yellow and white streamers were also noted.

1965 – Alta, UT, was in the midst of a storm that left the town buried under 105 inches of snow establishing a record for the state. (David Ludlum)

1988 – High winds created blizzard conditions in the mountains of Colorado. Winds gusted to 109 mph at Echo Lake, and a wind gust to 193 mph was reported atop Mount Evans. (Storm Data)

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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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