Weather forecast for Thursday May 25

May 25, 2011

By JOHN LINDSEY from PG&E

Marine low clouds have developed along the coastline and in the coastal valleys this morning.

A late season cold front will move in from the Pacific and will produce rain as far south as Monterey Bay today. This front will pass San Luis Obispo this afternoon with increasing
clouds. Snow levels will lower to near 7,500 feet across the Central Sierra.

Temperatures today will be quite cool for late May, ranging from the high 50’s near the coast, and the 60’s across the coastal valleys (San Luis Obispo). The North County (Paso Robles)
will reach the mid-70s.

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 and Friday.

The northwesterly (onshore) winds will further increase to moderate gale- to fresh gale-force (32-mph to 46-mph) levels on Saturday through Sunday.

Dry and but less 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°   54.1°      48.8°   56.0°      49.0°    58.0°

PG&E San Francisco Met Office predicted temps:

Inland Temperatures, Paso Robles

Actual                    Predicted

Tue             Wed           Thu           Fri           Sat          Sun             Mon           Tue            Wed
43 75          45 76        46 75           49 78         46 73         45 76        43 78         47 78         45 84

Coastal Valleys Temperatures, San Luis Obispo

Tue             Wed           Thu          Fri           Sat           Sun          Mon           Tue              Wed
43 65           46 67          47 69         49 70         46 68         45 70          46 72         45 72       49 74

SEA/SWELL:

This morning’s 4- to 6-foot northwesterly (310-degree deep-water) sea and swell (with a 7- to 12-second period) will decrease to 3- to 5-feet (with a 7- to 11-second period) this afternoon and will remain at this height and period through Thursday morning.

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 15-second period) on Thursday afternoon and will remain at this height but with a gradually shorter period through Saturday.

An 8- to 10-foot northwesterly (310-degree deep-water) sea and swell (with a 7- to 14-second period) is forecast along our coastline on Sunday, decreasing to 5- to 7-feet (with a 7- to
11-second period) on Monday through next Wednesday.

Arriving from the Southern Hemisphere:

Today’s 1- to 2-foot Southern Hemisphere (225-degree deep-water) swell (with a 16- to 18-second period) is forecast along our coastline on Friday and Saturday.

Another long-period Southern Hemisphere (185-degree deep-water) swell is expected to arrive along our coastline Tuesday at 2- to 4-feet (with a 19- to 21-second period), increasing
to 3- to 5-feet (with an 18- to 20-second period) next Wednesday.

WINDS:

This morning’s gentle to moderate (8- to 18-mph) northwesterly winds will continue through this afternoon, increasing to moderate to fresh (13- to 24-mph) levels this evening through tonight.

Gentle to moderate (8- to 18-mph) northwesterly winds our forecast on Thursday morning.

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

These winds will decrease on Monday and Tuesday.

DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

Today’s winds:

Max peak winds:      NW        6.7 mph at    7:00 a.m.
Max sustained wind:  NW        2.9 mph at    7:00 a.m.

Yesterday’s Maximum Winds:

Max peak winds:      NW       39.2 mph at    4:45 p.m.
Max sustained wind:  NW       31.1 mph at    4:45 p.m.

SEAWATER TEMPERATURES:

The Diablo Canyon waverider buoy is reporting a sea surface temperature of 51.6 degrees. The Nortek AWAC current meter is not reporting this morning.

Seawater temperatures will range between 49- to 52-degrees through Sunday.

OCEAN CURRENTS:

Today’s southerly (offshore) flowing current will continue to low southward through Sunday.

SEAWATER VISIBILITY:

Seawater visibility was 18- to 20-feet at the Diablo Canyon Intake.

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24-Hour Ocean Condition Outlook for Wednesday 05/25 to Thursday 05/26

Sea/Swell       DIR. NW      HT.   4-6   PER.   7-13  This morning
Decreasing to:  DIR. NW      HT.   3-5   PER.   7-12  This afternoon
Remaining  at:  DIR. NW      HT.   3-5   PER.   7-11  Tonight

WINDS:          DIR. NW      SPEED  5-10              This morning
Increasing to:  DIR. NW      SPEED 10-15              This afternoon
Increasing to:  DIR. NW      SPEED 15-20 + 25         Tonight
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48-Hour Ocean Condition Outlook for Thursday 05/26 to Friday 05/27

Sea/Swell       DIR. NW      HT.   3-5   PER.   7-11  Thursday morning
Increasing to:  DIR. NW      HT.   6-8   PER.   5-15  Thursday afternoon
Remaining  at:  DIR. NW      HT.   6-8   PER.   5-15  Thursday night

WINDS:          DIR. NW      SPEED  5-10              Thursday morning
Increasing to:  DIR. NW      SPEED 25-30 + 35         Thursday afternoon
Decreasing to:  DIR. NW      SPEED 20-25 + 30         Thursday night
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Extended Ocean Condition Outlook:

Increasing northwesterly winds are forecast on Saturday and Sunday.

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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
05    24    0712     7.2       14            261          52.7
05    25    0442     4.9       12            268          51.6

(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
05 24  0712  220    9     3    14    69   311   396   187   951  428
05 25  0442  150    4     4     6    25    82   258   325   131  349

Daily Swell Inspection Program

NAME                      DAY   TIME    HEIGHT   PERIOD     SST
(PST)   (FEET)  (SECONDS) (DEG. F)
# 166  Ocean Station Papa      25    0002      10       10       44.4
# 06   SE Papa                 25    0450      16       12       52.3
# 59   California Buoy         25    0450       7       12       55.4
# 01   Point Reyes Waverider   25    0446       4       13       50.5
# 15   Monterey Waverider Buoy 25    0450       4       10       51.8
# 28   Cape San Martin, Ca     25    0450       6       13       55.9
# 50   DCPP Waverider Buoy, Ca 25    0442       5       12       51.6
# 63   Harvest Buoy            25    0420       7       13       51.6
# 01   NW Hawaii               25    0450       8        8       77.5

* 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.

Monday    1500 through Tuesday     1500   0.00 inches
Tuesday   1500 through Wednesday   1500   0.00 inches

Precipitation this rain season (July 1 – June 30): 26.81 inches
Average season rainfall at DCPP to date:           24.38 inches

Ocean Lab Barometer:   30.05 in/Hg or 1017.6 mb  +0.0 mb (Steady)
Sunrise and Sunset

Today’s         Sunrise 5:52 AM      Sunset 8:07  PM
Tomorrow’s      Sunrise 5:52 AM      Sunset 8:08  PM

Tides:
Low Tide                 High Tide
AM          PM           AM          PM
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

1917 – A tornado ripped through southeast Kansas, traveling 65 mph. The average speed was a record for any tornado.

1988 – Unseasonably cool weather prevailed in the Upper Midwest. Marquette, MI, reported a record low of 26 degrees. (The National Weather Summary)

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