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
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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
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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
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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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