Weather forecast for Friday February 18

February 18, 2011

By JOHN LINDSEY from PG&E

SEA SWELL:

This morning’s 8- to 10-foot northwesterly (300-degree deep-water) swell (with an 11- to 13-second period) will continue at this height and period through Sunday.

Combined with this northwesterly swell will be 6- to 8-foot southerly (190-degree shallow-water) seas this afternoon, decreasing on Saturday.

This northwesterly (300-degree deep-water) swell will lower to 4- to 6-feet on Monday, further decreasing to 3- to 5-feet on Tuesday through Wednesday. However, increasing southerly seas will develop on Tuesday.

An 8- to 10-foot northwesterly (300-degree deep-water) swell (with an 11- to 15-second period) is forecast along our coastline on Thursday, increasing to 9- to 11-feet (with an
11- to 13-second period) next Friday.

PG&E San Francisco Met Office predicted temps:

Inland Temperatures, Paso Robles

Actual                    Predicted

Thu          Fri          Sat         Sun         Mon         Tue         Wed         Thu         Sat
34-56     49-51  38-50   34-52      33-54     34-57     33-57     34-53   34-53

Coastal Valleys Temperatures, San Luis Obispo

Thu          Fri         Sat         Sun         Mon         Tue         Wed          Thu         Sat
41-58     50-56 41-53    3- 56     36-58       37-61    36-60      3654      36-55

ATMOSPHERIC CONDITION:

A cold front stalled over Big Sur last night and produced heavy amounts of rainfall north of Cambria.

Three Peaks in Bug Sur recorded 5.94 inches of rain over the last 24 hours. Rocky Butte near San Simon reported 3.78 inches. Cambria has recorded 1.93 inches and Adelaida checks in with 2.5 inches.

As you head further southward rainfall amounts significantly decreased. Paul’s House at hwy 41 west & Toro Creek only recorded 0.80 inches and Diablo Canyon hasn’t even recorded
a quarter of an inch so far.

However, this condition will change later this morning.

The upper-level winds will move a vigorous 1,005 millibar low pressure system and associated cold front eastward towards San Luis Obispo. Frontal passage over Diablo Canyon will occur between 12 and 3 p.m. During frontal passage, moderate gale to fresh gale (32 to 46 mph) southeasterly winds and periods of heavy rain along with a chance of thunderstorms
will develop.

Periods of moderate to heavy rain and gusty winds will continue through tonight, turning to scattered rain showers (at times heavy) on Saturday as a cold upper-level trough moves over the Central Coast.

Rainfall totals from this system should range between 1 and 1.5 inches in the North County (Paso Robles), 1.5 and 2.5 inches in the coastal valleys (San Luis Obispo) and along the
beaches and 2.5 and 5.0 inches along the coastal mountains due to oragraphic enhancement.

Heavy snow above 3,000 feet in the Sierra will occur throughout the day today from north of Blue Canyon south into the southern Yosemite area. Also, heavy rain and snow in the 3,000 and 4,000 foot range will cross into the LA area late this afternoon and tonight with possible heavy snow across the Southern California Mountains.

A break in the weather is forecast on Sunday through Monday. Then another cold Gulf of Alaska weather system will drop southward and move parallel along the California coastline.

This system should spread rain and moderate to fresh (13 and 24 mph) southerly winds from north to south along the immediate coastal locations on Tuesday.

Cool and dry weather is forecast for the rest of next week.

DIABLO CANYON AIR TEMPERATURES:

Diablo Canyon Meteorological Tower Air Temperature Data

Yesterday’s         Today’s          Tomorrow’s
Min    Max        Min    Max         Min     Max
47.1°   53.7°     49.6°   53.0°      48.0     53.0

WINDS:

This morning’s fresh to strong (19 to 31 mph) southeasterly winds will increase to moderate gale to fresh gale (32 to 46 mph) levels between 12 and 3 p.m. with the frontal passage.

These winds will shift out of the southwest and decrease to fresh to strong (19 to 31 mph) levels this evening through Saturday morning.

Moderate to fresh (13 to 24 mph) northwesterly winds are forecast on Saturday afternoon through Monday.

Moderate to fresh (13 and 24 mph) southerly winds will develop on Tuesday, shifting and decreasing out of the northeast (offshore) on Wednesday.

Increasing westerly winds are forecast on Thursday, decreasing
next Friday.

DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

Today’s winds:

Max peak winds:      SE       32.9 mph at   5:45 a.m.
Max sustained wind:  SE       26.6 mph at   5:45 a.m.

Yesterday’s Maximum Winds:

Max peak winds:      SE       38.5 mph at  10:00 p.m.
Max sustained wind:  SE       31.3 mph at  10:00 p.m.

SEAWATER TEMPERATURES:

The Diablo Canyon waverider buoy is reporting a sea surface temperature of 54.1 degrees while the Nortek AWAC current meter is reporting 54.3 degrees.

Intake seawater temperatures will range between 53- and 55 -degrees through Sunday.

OCEAN CURRENTS:

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

A northerly (onshore) flowing current will continue to flow northward through Saturday, becoming a southerly (offshore) flowing current on Sunday.

SEAWATER VISIBILITY:

Seawater visibility was 2 to 3 feet at the Diablo Canyon Intake.

==========================================================================
24-Hour Ocean Condition Outlook for Friday 02/18 to Saturday 02/19

Sea/Swell       DIR. NW      HT.   8-10  PER.  11-13  This morning
Decreasing to:  DIR. NW      HT.   8-10  PER.  11-13  This afternoon
Decreasing to:  DIR. NW      HT.   8-10  PER.  11-13  Tonight

(Combined with:  DIR. S       HT.   4-6   PER.   4-6   This morning)
(Increasing to:  DIR. S       HT.   6-8   PER.   4-6   This afternoon)
(Decreasing to:  DIR. S       HT.   5-7   PER.   4-6   tonight)

WINDS:          DIR. SE      SPEED 30-35 + 40         This morning
Increasing to:  DIR. SE      SPEED 35-40 + 50         This afternoon
Decreasing to:  DIR. SW      SPEED 20-25 + 30         Tonight
===========================================================================
48-Hour Ocean Condition Outlook for Saturday 02/19 to Sunday 02/20

Sea/Swell       DIR. NW      HT.   8-10  PER.  11-13  Saturday morning
Decreasing to:  DIR. NW      HT.   8-10  PER.  11-13  Saturday afternoon
Decreasing to:  DIR. NW      HT.   8-10  PER.  11-13  Saturday night

(Combined with:  DIR. S       HT.   4-6   PER.   4-6   All day Saturday)

WINDS:          DIR. SW      SPEED 15-20 + 25         Saturday morning
Decreasing to:  DIR. WSW     SPEED 10-15              Saturday afternoon
Increasing to:  DIR. NW      SPEED 15-20 + 25         Saturday night
===========================================================================

Extended Ocean Condition Outlook:

An 8- to 10-foot northwesterly (300-degree deep-water) swell (with an 11- to 15-second period) is forecast along our coastline on Thursday, increasing to 9- to 11-feet (with an 11- to 13-second period) next Friday.

===========================================================================
The 24 – Hour Ocean Data From The Diablo Canyon Wave rider Buoy
MONTH  DAY  TIME  SIG.HEIGHT   PERIOD   SWELL DIRECTION     SST
02    10    0413     4.4       17            261          53.2
02    11    1443     4.2       13            268          60.8
02    12    1243     3.0       12            261          60.1
02    13    1943     5.2       14            258          55.8
02    14    0813     3.9       13            263          54.5
02    15    0413     8.2       12            268          53.8
02    16    0513     9.1       11            279          54.0
02    17    0243    11.7       14            268          54.0
02    18    0613     8.7       13            268          54.1

(cm) (sec)  22+   20    17    15    13     11    9    7
———————————————————————–
02 10  0413  133   17     5    46   258    87    70   254   126  135
02 11  1443  128   13     2    16    98   188   432   127    31   54
02 12  1143  100   11     1     6    47   154   102   193    67   42
02 13  1943  159   13     2     4    19   392   515   454   119   52
02 14  0813  120   13     2     5    17    98   295   203   100  139
02 15  0413  251   11     3     7    11   210  1042  1076   885  284
02 16  0513  278    4     4    18    25   253   794  1129   828 1237
02 17  0243  356   13    10    72   418  1588  1771  1312  1214  572
02 17  0543  312   13    10    79   331  1122  1127  1032  1087  570
02 18  0613  264    7     3    18    21   171   904   741   560  950

Daily Swell Inspection Program

NAME                      DAY   TIME    HEIGHT   PERIOD     SST
(PST)   (FEET)  (SECONDS) (DEG. F)
# 166  Ocean Station Papa      18    0402      12        9       42.6
# 06   SE Papa                 18    0650      14       11       53.6
# 59   California Buoy         18    0650      10       11       54.7
# 01   Point Reyes Waverider   18    0646      10       13       51.4
# 15   Monterey Waverider Buoy 18    0650       7       13       53.8
# 28   Cape San Martin, Ca     18    0650      10       11       54.1
# 50   DCPP Waverider Buoy, Ca 18    0613       9       13       54.1
# 63   Harvest Buoy            18    0620      10       14       54.7
# 01   NW Hawaii               18    0650       8       15       73.8

* 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.

Sunday     1500 through Monday     1500   0.02 inches
Monday     1500 through Tuesday    1500   0.02 inches
Tuesday    1500 through Wednesday  1500   0.41 inches
Wednesday  1500 through Thursday   1500   0.05 inches
Thursday   1500 through Friday     0800   0.23 inches

Precipitation this rain season (July 1 – June 30): 18.41 inches
Average season rainfall at DIP to date:            16.12 inches

Ocean Lab Barometer:   29.80 in/Hg or 1009.2 mb  -1.5 mb (Falling)

Sunrise and Sunset

Today’s         Sunrise 6:46 AM      Sunset 5:48  PM
Tomorrow’s      Sunrise 6:45 AM      Sunset 5:49  PM

Tides:
Low Tide                 High Tide
AM          PM           AM          PM
18 Friday      3:20  1.2    4:06 -0.8    9:25 6.1   10:27  5.1
19 Saturday    4:12  0.8    4:42 -0.4   10:15 5.7   11:03  5.4
20 Sunday      5:07  0.5    5:19  0.2   11:08 5.1   11:43  5.6
21 Monday      6:06  0.4    5:58  0.8   —– —   12:07  4.5
22 Tuesday     7:13  0.4    6:40  1.5   12:26 5.7    1:17  3.8
23 Wednesday   8:29  0.4    7:30  2.1    1:15 5.6    2:47  3.3
24 Thursday    9:54  0.3    8:40  2.5    2:14 5.5    4:40  3.1
25 Friday     11:15  0.1   10:15  2.7    3:24 5.3    6:18  3.3
26 Saturday  (12:21 -0.2)  11:41  2.6    4:40 5.2    7:19  3.6
27 Sunday     —–  —    1:14 -0.3    5:48 5.3    8:01  3.9
28 Monday     12:46  2.4    1:56 -0.4    6:45 5.3    8:33  4.0
1 Tuesday     1:35  2.1    2:32 -0.3    7:33 5.3    9:01  4.2
=========================================================================

This day in weather history

1899 – While much of the central and eastern U.S. was recovering from the most severe cold wave of modern history, the temperature at San Francisco soared to 80 degrees to
establish a record for month of February. (David Ludlum)

1959 – Some of the higher elevations of California were in the midst of a five day storm which produced 189 inches of snow, a single storm record for North America. (13th-19th)
(David Ludlum)

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