Weather forecast for Monday May 23

May 23, 2011

By JOHN LINDSEY from PG&E

Batten down the hatches. A 1,031-millibar Eastern Pacific High will move gradually southeastward towards the Southern California while a 1,001-millibar thermal low develops over the desert southwest.

This condition will produce moderate gale- to fresh gale-force (32 mph to 46 mph) northwesterly winds along the coastline today. These onshore winds will give cooler temperatures and partly cloudy to clear skies through this evening.

Today’s temperatures will range from the high 50s along the northwesterly (Los Osos and Morro Bay) facing beaches to the high 60s along the southwesterly (Avila Beach and Cayucos) facing beaches and coastal valleys (San Luis Obispo). The North County (Paso Robles) will reach low-70s.

A warming trend will develop on Tuesday along with the return of night and morning low clouds and fog.

A strong late season cold front will move in from the Pacific and will produce rain as far south as Monterey Bay on Wednesday. However, The Central Coast will only see partly cloudy skies.

The main effect of this cold front, will be to produce another round of strong to gale force (25- and 38-mph) northwesterly winds on Thursday. Thursday should also be partly cloudy with warmer afternoon temperatures and Friday should be similar with slightly cooler temperatures near the coast. The northwesterly (onshore) winds will further increase to moderate gale- to fresh gale-force (32-mph to 46-mph) levels on Friday through Sunday.

Dry and windy weather will continue into Memorial Day with temperatures across the Central Coast continuing to remain below normal.

Yesterday’s         Today’s          Tomorrow’s
Min    Max        Min    Max         Min     Max
49.7°   55.1°     50.4°   56.0°      50.0°    57.0°

PG&E San Francisco Met Office predicted temps:

Inland Temperatures, Paso Robles

Actual                    Predicted

Sun                 Mon          Tue          Wed          Thu          Fri          Sat           Sun         Mon
50 76           44 72      41 76      46 78        44 76     48 80    52 79     49 76     45 80

Coastal Valleys Temperatures, San Luis Obispo

Sun               Mon          Tue          Wed           Thu          Fri          Sat          Sun          Mon
45 67        45 64        46 67      45 66         50 70     49 75    49 72    47 73      48 74

SEA/SWELL:

Moderate gale- to fresh gale-force (32- to 46-mph) northwesterly winds along our coastline will generate a 7- to 9-foot northwesterly (310-degree deep-water) sea and swell (with a 5- to 15-second period) this afternoon and will remain at this height and period through Tuesday morning.

This northwesterly (310-degree deep-water) sea and swell will decrease to 5- to 7-feet (with a 7- to 13-second period) on Tuesday afternoon and night, further lowering to 3- to 4-feet
Wednesday.

Another round of increasing northwesterly winds will generate a 6- to 8-foot northwesterly (300-degree deep-water) sea and swell (with a 5- to 11-second period) Thursday through Sunday.

Arriving from the Southern Hemisphere:

Today’s 1- to 2-foot Southern Hemisphere (190-degree deep-water) swell (with a 16- to 18-second period) will build to 2- to 3-feet on Tuesday (with a 14- to 16-second period. This swell will decrease 1- to 2-feet Wednesday.

WINDS:

Moderate gale- to fresh gale-force (32- to 46-mph) northwesterly winds will develop along our coastline this afternoon and will remain at this level through tonight.

Strong to gale force (25- to 38-mph) northwesterly winds are forecast along our coastline on Tuesday, further decreasing to gentle to moderate (8- to 18-mph) levels on Wednesday.

Another round of strong to gale force (25- and 38-mph) northwesterly winds are forecast on Thursday, increasing to moderate gale to fresh gale force (32- to 46-mph) levels on Friday through Sunday.

DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

Today’s winds:

Max peak winds:      NW       28.1 mph at    3:30 p.m.
Max sustained wind:  NW       22.5 mph at    3:30 p.m.

Yesterday’s Maximum Winds:

Max peak winds:      NW       42.4 mph at    7:45 p.m.
Max sustained wind:  NW       33.7 mph at    7:45 p.m.

SEAWATER TEMPERATURES:

The Diablo Canyon waverider buoy is reporting a sea surface temperature of 50.9 degrees. The Nortek AWAC current meter is not reporting this morning.

Seawater temperatures will range between 48- to 51-degrees through Friday.

OCEAN CURRENTS:

Today’s southerly (offshore) flowing current will continue to flow southward through Friday.

SEAWATER VISIBILITY:

Seawater visibility was 12- to 14-feet at the Diablo Canyon Intake.

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24-Hour Ocean Condition Outlook for Monday 05/23 to Tuesday 05/24

Sea/Swell       DIR. NW      HT.   6-8   PER.   7-11  This morning
Increasing to:  DIR. NW      HT.   7-9   PER.   7-15  This afternoon
Remaining  at:  DIR. NW      HT.   7-9   PER.   7-15  Tonight

(Combined with:  DIR. S       HT.   1-2   PER.  16-18  All day)

WINDS:          DIR. NW      SPEED 20-25 + 30         This morning
Increasing to:  DIR. NW      SPEED 30-40 + 50         This afternoon
Decreasing to:  DIR. NW      SPEED 25-30 + 40         Tonight
===========================================================================
48-Hour Ocean Condition Outlook for Tuesday 05/24 to Wednesday 05/25

Sea/Swell       DIR. NW      HT.   7-9   PER.   7-15  Tuesday morning
Decreasing to:  DIR. NW      HT.   5-7   PER.   7-14  Tuesday afternoon
Decreasing to:  DIR. NW      HT.   5-6   PER.   7-13  Tuesday night

(Combined with:  DIR. S       HT.   2-3   PER.  14-16  All day Tuesday)

WINDS:          DIR. NW      SPEED 15-20              Tuesday morning
Increasing to:  DIR. NW      SPEED 25-30 + 40         Tuesday afternoon
Decreasing to:  DIR. NW      SPEED 20-25              Tuesday night
===========================================================================

Extended Ocean Condition Outlook:

Gentle to moderate (8- to 18-mph) northwesterly winds are forecast
on Wednesday.

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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
05    17    1012     6.9       11            278          54.5
05    18    1942     7.0       20            206          55.0
05    19    1312     5.9       18            209          53.4
05    20    1412     6.6       15            199          54.5
05    21    1842     6.8        8            288          52.7
05    22    1942     8.4        9            286          51.8
05    23    0542     7.7       10            286          50.9

(cm) (sec)  22+   20    17    15    13     11    9    7
———————————————————————
05 17  1012  211    9     2     5     3    13   190   728   818  578
05 18  1942  213    7    10   260    30    10    44   154   855  866
05 19  1312  180    9     4   116   202    16    22   245   566  372
05 20  1412  202    4     5    47   235   495   389   202   292  557
05 21  1842  208    7     5    13    58   286   128    63   328 1182
05 22  1942  255    9     3    19    11    50   150   493  1387 1151
05 23  0542  236    9     3    40    61    70   133   650  1012  922

Daily Swell Inspection Program

NAME                      DAY   TIME    HEIGHT   PERIOD     SST
(PST)   (FEET)  (SECONDS) (DEG. F)
# 166  Ocean Station Papa      23    0402       9       11       44.4
# 06   SE Papa                 23    0550       9       14       54.7
# 59   California Buoy         23    0550       9       15       54.1
# 01   Point Reyes Waverider   23    0546      10       17       49.9
# 15   Monterey Waverider Buoy 23    0550       7        9       51.8
# 28   Cape San Martin, Ca     23    0550      10        9       54.5
# 50   DCPP Waverider Buoy, Ca 23    0542       8       10       50.9
# 63   Harvest Buoy            23    0520      11       11       51.8
# 01   NW Hawaii               23    0550       7        8       77.4

* 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.

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

Precipitation this rain season (July 1 – June 30): 26.81 inches
Average season rainfall at DCPP to date:           24.36 inches

Ocean Lab Barometer:   30.07 in/Hg or 1018.2 mb  +0.5 mb (Rising)
Sunrise and Sunset

Today’s         Sunrise 5:54 AM      Sunset 8:06  PM
Tomorrow’s      Sunrise 5:53 AM      Sunset 8:07  PM

Tides:
Low Tide                 High Tide
AM          PM           AM          PM
23 Monday      9:54  0.0   10:38  2.5    2:34 4.3    5:08  4.0
24 Tuesday    10:44  0.5   11:59  2.1    3:47 3.7    5:53  4.2
25 Wednesday  11:31  0.9   —–  —    5:08 3.4    6:30  4.5
26 Thursday    1:02  1.6   12:14  1.2    6:28 3.2    7:01  4.7
27 Friday      1:52  1.1   12:53  1.5    7:38 3.1    7:30  4.9
28 Saturday    2:33  0.6    1:29  1.8    8:38 3.2    7:58  5.2
29 Sunday      3:10  0.2    2:03  2.0    9:29 3.3    8:26  5.4
30 Monday      3:45 -0.2    2:37  2.2   10:14 3.4    8:56  5.6
31 Tuesday     4:19 -0.5    3:11  2.3   10:57 3.4    9:28  5.7
=========================================================================

This day in weather history

1882 – An unusual late season snow blanketed eastern Iowa, with four to six inches. (David Ludlum)

1953 – The temperature at Hollis OK soared from a morning low of 70 degrees to an afternoon high of 110 degrees to establish a state record for the month of May.

1990 – A cold front crossing the western U.S. produced snow over parts of Oregon, California, Nevada, Idaho and Utah, with five inches reported at Austin NV, and four inches at Crater Lake National Park in Oregon. Strong winds behind the cold front sharply reduced visibilities in blowing dust over central California. (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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