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
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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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