• This week's San Luis Obispo Tribune's Weather Watch Column "Does morning dew on boats mean danger? Here’s the truth behind the old sailor’s saying" https://www.sanluisobispo.com/news/weather/weather-watch • You can catch live weather forecasts weekday mornings from 6-9 a.m. on KVEC 920 AM on First Look with Andy Morris. • For weather updates, charts and photos, along with power outage information and other events you can follow me at: https://twitter.com/pge_john ========== PG&E DCPP Weather Forecast for Wednesday 05/05/21 ========== SEA/SWELL: A 3- to 5-foot northwesterly (295-degree, deep-water) swell (with an 8- to 13-second period) is forecast along our coastline this afternoon into Thursday. Increasing northwesterly winds will generate a 4- to 6-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 11-second period) Friday morning, building to 8 to 10 feet (with a 5- to 11-second period) on Friday afternoon through Saturday. This northwesterly sea and swell is expected to peak on Sunday at 9- to 11-feet (with a 5- to 11-second period), decreasing to 6 to 8 feet on Monday and 4 to 6 feet by Tuesday. A 3- to 5-foot northwesterly (290-degree, deep-water) swell (with an 8- to 11-second period) is forecast along our coastline next Wednesday and Thursday. ATMOSPHERIC CONDITIONS: Gentle northeasterly (offshore) winds kept the marine layer away from the beaches early this morning; however, as the winds shifted out of the southeast (onshore) the stratus clouds moved over most of the beaches, except for Los Osos and Morro Bay. Today's high temperatures will reach the low-90s in the inland valleys (Paso Robles) and mid-70s in the coastal valleys (San Luis Obispo). The beaches will range between the mid to high-50s. Gentle to moderate (8 to 18 mph) northwesterly to southeasterly winds will continue through Friday morning. Consequently, the marine layer will persist along many of the beaches today and tomorrow and will deepen and move into the coastal valleys and a few of the inland valleys tonight into Thursday morning. A dry cold front will move through the Central Coast Thursday night, followed by strong to gale-force (25 to 38 mph) northwesterly winds along the coastline and clearing skies on Friday into Monday. Another Catalina eddy is forecast to develop in the Southern California Bight next Tuesday and Wednesday. This condition will create gentle to moderate (8 to 18 mph) northwesterly to southeasterly winds and a deep marine layer with areas of fog and drizzle throughout the Central Coast. WILDFIRE INDEX RATINGS: COASTAL: FIA 508 INLAND: FIA 497, 510, 575, 580, 582 and 590 The PG&E Fire Index Ratings will be at medium (R2) levels along our Coastline and high (R3) levels in the Coastal and Inland Valleys and the Far Inland areas today and Thursday. The PG&E Fire Index Ratings will be at high (R3) levels along our Coastline, Coastal and Inland Valleys and the Far Inland areas on Friday. DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA: Yesterday's Today's Tomorrow's Min Max Min Max Min Max 50.6° 56.1° 50.7° 55.0° 51.0° 55.0° PG&E Weather Office in San Francisco predicted temperatures for San Luis Obispo County Inland Temperatures, Paso Robles Actual Predicted Tue Wed Thu Fri Sat Sun Mon Tue Wed 46 94 52 91 49 85 49 79 41 90 45 87 45 85 44 84 44 80 Coastal Valleys Temperatures, San Luis Obispo Tue Wed Thu Fri Sat Sun Mon Tue Wed 48 80 48 76 52 70 49 68 44 73 43 70 47 73 47 74 46 67 WINDS: Gentle to moderate (8 to 18 mph) northwesterly to southeasterly winds are forecast this afternoon into Thursday morning, increasing out of the northwest to moderate to fresh (13 to 24 mph) levels on Thursday afternoon and night. Strong to gale-force (25 to 38 mph) northwesterly winds are forecast on Friday through Monday. Gentle to moderate (8 to 18 mph) northwesterly to southeasterly winds are forecast next Tuesday and Wednesday. DIABLO CANYON METEOROLOGICAL TOWER WIND DATA: Today's Maximum Winds: Max peak winds: SE 16.0 mph @ 7:00 a.m. Max sustained wind: SE 12.0 mph @ 7:00 a.m. Yesterday's Maximum Winds: Max peak winds: NW 24.0 mph @ 1:30 p.m. Max sustained wind: NW 20.0 mph @ 1:30 p.m. SEAWATER TEMPERATURES: Seawater temperatures will range between 51 and 54 degrees through Friday morning, decreasing to 50 and 52 degrees on on Friday afternoon through Monday. OCEAN CURRENTS: A southerly (offshore) flowing current will continue to flow southward through Monday. SEAWATER VISIBILITY: Seawater visibility was 10 to 12 feet at the Diablo Canyon Marina. ========================================================================== 24-Hour Ocean Condition Outlook for Wednesday 05/05 to Thursday 05/06 SWELL: DIR. NW HT. 4-6 PER. 7-14 This morning Decreasing to: DIR. NW HT. 3-5 PER. 8-13 This afternoon Remaining at: DIR. NW HT. 3-5 PER. 8-13 Tonight WINDS: DIR. SE SPEED 5-10 This morning Increasing to: DIR. NW SPEED 10-15 This afternoon Decreasing to: DIR. SE SPEED 5-10 Tonight ========================================================================== 48-Hour Ocean Condition Outlook for Thursday 05/06 to Friday 05/07 SWELL: DIR. NW HT. 3-5 PER. 8-12 Thursday morning Decreasing to: DIR. NW HT. 3-5 PER. 8-12 Thursday afternoon Remaining at: DIR. NW HT. 3-5 PER. 8-11 Thursday night WINDS: DIR. SE SPEED 5-10 Thursday morning Increasing to: DIR. NW SPEED 10-15 Thursday afternoon Decreasing to: DIR. SE SPEED 5-10 Thursday night ========================================================================== Extended Ocean Condition Outlook: Strong to gale-force (25 to 38 mph) northwesterly winds are forecast on Friday through Monday. ========================================================================== The 24 - Hour Ocean Data from the Diablo Canyon Waverider Buoy: MONTH DAY TIME SIG.HEIGHT PERIOD SWELL DIRECTION SST 05 01 2030 7.5 8 286 52.9 05 02 2100 8.7 10 284 52.0 05 03 0330 7.4 15 244 51.6 05 04 0900 6.9 10 293 52.2 05 05 0500 5.5 14 245 53.2 DCPP Ocean Lab Waverider Buoy Energy Spectral Analysis: Mo. daytime sig.ht. sig.per. energy (cm.sq.) (cm) (sec) 22+ 20 17 15 13 11 9 7 -------------------------------------------------------------------------- 05 01 2030 228 7 13 72 53 68 301 143 589 1147 05 02 2100 266 9 7 69 308 97 105 680 1617 900 05 03 0330 226 6 74 463 492 65 401 701 549 503 05 04 0900 210 9 2 20 58 382 230 471 836 489 05 05 0500 167 4 1 5 24 178 284 134 355 389 Daily Swell Inspection Program for today: NAME DAY TIME HEIGHT PERIOD SST (PDT) (FEET) (SECONDS) (DEG. F) # 66 Ocean Station Papa 5 0500 9 9 42.3 # 06 SE Papa 5 0550 10 7 56.7 # 05 West Washington State 5 0550 7 11 51.4 # 59 California No Recent Reports # 36 Grays Harbor 5 0500 4 12 52.9 # 44 Humboldt Bay Waverider 5 0508 6 8 51.3 # 94 Cape Mendocino 5 0500 6 13 50.7 # 29 Point Reyes Waverider 5 0503 11 8 48.9 # 42 San Francisco Sandbar 5 0530 5 14 53.8 # 15 Monterey Waverider Buoy 5 0530 6 14 52.7 # 28 Cape San Martin 5 0510 7 8 n/a # 76 DCPP Waverider 5 0500 6 14 53.2 # 22 Santa Lucia Escarpment 5 0500 8 14 54.3 # 11 Point Arguello 5 0500 6 14 54.7 # 63 Harvest Buoy 5 0530 7 14 51.8 # 19 San Nicolas Island 5 0530 6 13 55.9 # 20 Scripps 5 0500 3 10 64.8 # 10 Waimea Bay, Hawaii 5 0531 4 11 76.6 # 33 Pearl Harbor Entrance 5 0500 2 13 77.7 # 04 SE Hawaii 5 0500 5 12 76.8 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): 11.49 inches Average season rainfall at DCPP to date: 20.00 inches Ocean Lab Barometer: 29.91 in/Hg or 1012.8 mb +1.0 mb (steady) Today's Sunrise 6:07 AM Sunset 7:52 PM Tomorrow's Sunrise 6:06 AM Sunset 7:53 PM Tides: Low Tide High Tide AM PM AM PM 5 Wednesday 12:47 2.2 1:03 -0.1 6:11 4.2 7:54 4.5 6 Thursday 1:46 1.7 1:46 0.2 7:19 4.1 8:24 4.7 7 Friday 2:33 1.1 2:21 0.5 8:17 4.0 8:50 4.9 8 Saturday 3:14 0.7 2:52 0.9 9:07 3.9 9:13 5.1 9 Sunday 3:50 0.3 3:18 1.2 9:53 3.8 9:35 5.2 10 Monday 4:24 0.0 3:44 1.6 10:36 3.7 9:56 5.3 11 Tuesday 4:57 -0.2 4:08 1.9 11:20 3.6 10:19 5.3 12 Wednesday 5:31 -0.4 4:34 2.2 (12:05 3.5) 10:44 5.3 13 Thursday 6:07 -0.4 5:00 2.5 (12:54 3.4) 11:11 5.2 14 Friday 6:47 -0.4 5:28 2.7 (1:50 3.3) 11:42 5.1 15 Saturday 7:31 -0.4 6:01 2.9 ----- --- 2:58 3.2 16 Sunday 8:21 -0.3 6:48 3.1 12:18 4.9 4:16 3.3 17 Monday 9:16 -0.2 8:13 3.2 1:03 4.7 5:22 3.4 18 Tuesday 10:12 -0.1 10:04 3.1 2:02 4.4 6:03 3.6 19 Wednesday 11:05 -0.1 11:35 2.7 3:18 4.2 6:32 3.9 20 Thursday 11:54 0.0 ----- --- 4:43 4.0 6:58 4.3 21 Friday 12:42 2.0 12:38 0.2 6:03 3.9 7:25 4.8 22 Saturday 1:37 1.2 1:19 0.5 7:16 3.9 7:54 5.3 23 Sunday 2:27 0.4 2:00 0.8 8:22 4.0 8:26 5.8 24 Monday 3:16 -0.4 2:40 1.2 9:25 4.0 9:02 6.3 25 Tuesday 4:05 -1.1 3:22 1.5 10:26 4.0 9:40 6.6 26 Wednesday 4:54 -1.6 4:05 1.9 11:27 3.9 10:21 6.7 27 Thursday 5:45 -1.8 4:52 2.3 (12:29 3.8) 11:06 6.6 28 Friday 6:37 -1.8 5:44 2.5 (1:33 3.8) 11:54 6.2 29 Saturday 7:32 -1.6 6:45 2.8 ----- ---- 2:41 3.8 30 Sunday 8:30 -1.2 8:01 2.9 12:48 5.8 3:48 3.9 31 Monday 9:29 -0.8 9:34 2.9 1:48 5.2 4:51 4.0 1 Tuesday 10:27 -0.4 11:08 2.5 2:59 4.6 5:44 4.3 2 Wednesday 11:21 0.1 ----- --- 4:19 4.1 6:28 4.5 3 Thursday 12:28 2.0 12:09 0.5 5:41 3.7 7:05 4.8 4 Friday 1:29 1.5 12:51 0.9 6:57 3.5 7:35 5.0 5 Saturday 2:19 0.9 1:28 1.3 8:04 3.4 8:03 5.2 ========================================================================= This day in weather history 1987 - Unseasonably hot weather prevailed in the western U.S. A dozen cities in California reported record high temperatures for the date. Afternoon highs of 93 degrees at San Francisco, 98 degrees at San Jose, 100 degrees at Sacramento, and 101 degrees at Redding, were the warmest of record for so early in the season. The high of 94 degrees at Medford OR was also the warmest of record for so early in the season. ======================================================================== 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. Replication of this email must be in its entirety. You may view and copy material from this forecast, provided you retain all copyright, trademark, and other proprietary notices displayed on the materials. Use of these materials in publications, radio, television, other media presentations, or other websites is prohibited without PG&E's express written consent. PG&E is a subsidiary of PG&E Corporation, one of the largest natural gas and electric utilities in the United States, delivering some of the nation's cleanest energy to 15 million people in Northern and Central California. If you would like to subscribe or unsubscribe to this daily forecast, please send an email to PGEweather@pge.com. Any questions about this forecast, please E-mail John Lindsey at jcl5@pge.com