Weather forecast for Thursday February 17

February 17, 2011

By JOHN LINDSEY from PG&E

SEA SWELL:

This morning’s northwesterly swell peaked at 11.7 feet with a 14 second period at the Diablo Canyon waverider buoy.

This morning’s 11- to 13 foot northwesterly (300-degree deep-water) swell (with a 13- to 15-second period) will gradually decrease to 8- to 10 feet by tonight.

Combined with this northwesterly swell will be 3- to 5-foot southerly (190-degree shallow-water) seas today, increasing to 5- to 7-feet on Friday.

Note: A 6.2 foot high tide occurred at 8:37 this morning.

An 8- to 10-foot west-northwesterly (295-degree deep-water) swell (with an 11- to 13-second period) is forecast along our coastline on Friday and will decrease to 7- to 9-feet (with an
11- to 14-second period) on Saturday into Sunday.

This west-northwesterly (295-degree deep-water) swell will further lower to 4- to 6-feet on Monday. However, increasing southerly seas will develop later on Monday into Tuesday.

An 8- to 10-foot northwesterly (300-degree deep-water) swell (with an 11- to 13-second period) is forecast along our coastline Tuesday and will remain at this height and period
through next Friday.

PG&E San Francisco Met Office predicted temps:

Inland Temperatures, Paso Robles

Actual                    Predicted

Wed          Thu         Fri         Sat        Sun         Mon         Tue         Wed         Thu
50-56     35-53    40-52  35-51   32-54    32-52      35-53     34-55      32-55

Coastal Valleys Temperatures, San Luis Obispo

Wed          Thu         Fri         Sat         Sun         Mon         Tue         Wed         Thu
50-57     42-55    42-54   37-54   34-58    35-56      37-59    39-59      37-59

WINDS:

This morning’s moderate to fresh (13 to 24 mph) southeasterly winds will increase to strong to gale (25 to 38 mph) levels by this evening into Friday morning.

These winds will decrease and shift out of the southwest on on Friday afternoon through Friday night.

Moderate to fresh (13 to 24 mph) northwesterly winds are forecast over the weekend.

Increasing southerly winds are forecast on Monday through Tuesday.

ATMOSPHERIC CONDITION:

Yesterday’s rain totals as of 5 p.m.:

Arroyo Grande …………………………  0.77″
Atascadero, Heilmann Regional Park ………  0.59″
Atascadero, Micky’s Home ……………….  0.67″
Atascadero, NW Side ……………………  0.79″
Baywood Park ………………………….  0.45″
Black Mountain ………………………..  0.60″
Camp Roberts ………………………….  0.16″
Camp San Luis  ………………………..  0.91″
Cambria ………………………………  0.51″
Cottontail Creek near Cayucos……………  1.20″
Condor Lookout Los Padres National Forest ..  0.91″
Creston at Rich’s Home …………………  0.30″
Davis Peak, north of Avila Beach…………  0.79″
Diablo Canyon …………………………  0.41″
Hog Canyon near Paso Robles …………….  0.24″
Islay Hill, San Luis Obispo …………….  0.68″
Las Tablas Fire Station ………………..  1.38″
Los Osos George’s Home …………………  0.47″
Morro Bay …………………………….  0.36″
Nipomo ……………………………….  0.43″
Oak Shores at Jim’s House ………………  1.00″
Oceano ……………………………….  0.43″
Paul’s House (41 West & Toro Creek) ……..  1.12″
Paso Robles Airport ……………………  0.26″
PG&E Energy Education Center ……………  0.45″
Rocky Butte …………………………..  2.00″
Shell Beach Daniels in Sunset Palisades ….  0.49″
Santa Margarita Fire Department …………  0.81″
Santa Margarita ……………………….  1.32″
San Luis Obispo Water Reclamation Facility .  0.83″
Santa Maria Public Airport ……………..  0.31″
San Luis Obispo County Airport ………….  0.61″
Shandon, CDF Yard ……………………..  0.24″
SLOWeather.com ………………………..  1.27″
Templeton …………………………….  0.55″
Three Peaks …………………………..  2.68″

Scattered rain showers and moderate to fresh (13 to 24 mph) southeasterly winds will continue through this afternoon. Temperatures the next several days will be on the cool side,
with maximum readings only in the 40’s to low 50’s and minimums in the 30’s and low 40’s.

Heavy snow will fall across Sierra through Saturday with snow levels near 3,000 feet north – 4,500 feet south.

Energetic upper-level winds caused cyclogenesis about 200 miles west of Cape Mendocino this morning. This surface low will intensify to 1,003 millibars and move south-southeastward towards the Central Coast. The associated cold front will pivot southward along our coastline tonight into Friday and will produce strong to gale force (25 and 38 mph) southerly winds and periods of moderate to heavy rain tonight into Friday.

Rain will turn to showers by Saturday morning, ending by Saturday afternoon as the front finally moves into Southern California.

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.

A break in the weather is forecast on Saturday afternoon through Monday afternoon. Then another cold Gulf of Alaska weather system will drop southward across the Central Coast
Monday night into Tuesday with another round of gale force southerly winds, moderate rain and low snow levels. However, this low pressure system cloud track further out to
sea and miss the region entirely.

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
50.8°   53.7°     47.1°   52.0°      47.0     53.0

DIABLO CANYON METEOROLOGICAL TOWER WIND DATA:

Today’s winds:

Max peak winds:      SE       27.9 mph at   7:45 a.m.
Max sustained wind:  SE       23.0 mph at   7:45 a.m.

Yesterday’s Maximum Winds:

Max peak winds:      SE       36.5 mph at   5:45 a.m.
Max sustained wind:  SE       24.4 mph at   5:45 a.m.

SEAWATER TEMPERATURES:

The Diablo Canyon waverider buoy is reporting a sea surface temperature of 54.0 degrees while the Nortek AWAC current meter is reporting 54.2 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 Friday, becoming a southerly (offshore) flowing current on Saturday and Sunday.

SEAWATER VISIBILITY:

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

==========================================================================
24-Hour Ocean Condition Outlook for Thursday 02/17 to Friday 02/18

Sea/Swell       DIR. NW      HT.  11-13  PER.  13-15  This morning
Decreasing to:  DIR. NW      HT.  10-12  PER.  13-15  This afternoon
Decreasing to:  DIR. NW      HT.   8-10  PER.  12-14  Tonight

(Combined with:  DIR. S       HT.   3-5   PER.   4-6   today)

WINDS:          DIR. SE      SPEED 15-20 + 25         This morning
Increasing to:  DIR. SE      SPEED 20-25 + 30         This afternoon
Increasing to:  DIR. SE      SPEED 30-35 + 40         Tonight
===========================================================================
48-Hour Ocean Condition Outlook for Friday 02/18 to Saturday 02/19

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

(Combined with:  DIR. S       HT.   5-7   PER.   4-6   All day Friday)

WINDS:          DIR. SE      SPEED 30-35 + 40         Friday morning
Decreasing to:  DIR. SW      SPEED 20-25 + 35         Friday afternoon
Decreasing to:  DIR. SW      SPEED 15-20 + 25         Friday night
===========================================================================

Extended Ocean Condition Outlook:

An 8- to 10-foot northwesterly (300-degree deep-water) swell (with an 11- to 13-second period) is forecast along our castline Tuesday and will remain at this height and period through 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    17    0543    10.2       14            274          54.0

(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

Daily Swell Inspection Program

NAME                      DAY   TIME    HEIGHT   PERIOD     SST
(PST)   (FEET)  (SECONDS) (DEG. F)
# 166  Ocean Station Papa      17    0402      18       13       42.4
# 06   SE Papa                 17    0550      12       11       53.6
# 59   California Buoy         17    0550      15       14       54.9
# 01   Point Reyes Waverider   17    0546      12       14       51.4
# 15   Monterey Waverider Buoy 17    0550      10       15       52.9
# 28   Cape San Martin, Ca     17    0550      13       15       54.3
# 50   DCPP Waverider Buoy, Ca 17    0543      10       14       54.0
# 63   Harvest Buoy            17    0520      15       13       54.7
# 01   NW Hawaii               17    0550       9        8       73.6

* 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

Precipitation this rain season (July 1 – June 30): 18.18 inches
Average season rainfall at DIP to date:            15.93 inches

Ocean Lab Barometer:   29.94 in/Hg or 1013.9 mb  -1.7 mb ( Falling )

Sunrise and Sunset

Today’s         Sunrise 6:47 AM      Sunset 5:47  PM
Tomorrow’s      Sunrise 6:46 AM      Sunset 5:48  PM

Tides:
Low Tide                 High Tide
AM          PM           AM          PM
17 Thursday    2:30  1.6    3:31 -1.0    8:37 6.2    9:53  4.7
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

1930 – Eureka, CA, reported an all-time record high of 85 degrees, a record which lasted until September of 1983.

1936 – The temperature at McIntosh SD plunged to 58 degrees below zero to establish a state record. (David Ludlum)

1990 – The biggest winter storm of the season hit the Pacific Coast Region. In northern California, snow fell along the coast, and two day totals in the mountains ranged up to 67 inches
at Echo Summit. Snowfall totals in the mountains of southern California ranged up to 48 inches at Green Valley, with 46 inches reported at Big Bear. Up to two feet of snow
blanketed the southern Cascade Mountains of Oregon, and 20 to 35 inches were reported in the northern Cascades of Oregon. Up to ten inches of snow blanketed Seattle WA.
(The National Weather Summary) (Storm Data)

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