• This week's San Luis Obispo Tribune's Weather Watch Column "The ocean in SLO is so cold it’s like ‘hundreds of needles’ on your skin. Here’s why" https://www.sanluisobispo.com/news/weather/weather-watch/ article229231984.html • You can catch the live weather forecasts weekday mornings from 6-9 on the 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 Good Friday 04/19/19 =========== SEA/SWELL: Today's 4- to 6-foot northwesterly (300-degree, deep-water) swell (with an 8- to 14-second period) will continue at this level through tonight. A 6- to 8-foot northwesterly (315-degree, deep-water) sea and swell (with a 5- to 12-second period) will develop along our coastline on Saturday, increasing to 8 to 10 feet (with a 5- to 9-second period) on Sunday into Monday. A 4- to 6-foot northwesterly (300-degree, deep-water) swell (with an 8- to 11-second period) is forecast along our coastline on Tuesday through next Friday. ATMOSPHERIC CONDITION: This morning's marine low clouds with areas of fog will clear later this morning from the coastal valleys, but will persist along the beaches for most of the day. Combined with the marine low clouds will be variable mid to high-level clouds today. Consequently, temperatures along the coastline will be between 10 and 15 degrees cooler than yesterday's. A low-pressure system is then forecast to move through the Central Coast on Saturday into Easter Sunday with increasing clouds, areas of drizzle, strong to gale-force (25 to 38 with gust to 45 mph) northwesterly winds and cooler temperatures throughout the Central Coast. A ridge of high pressure will build behind the departing low-pressure system on Monday for fair and dry weather. As the ridge strengthens, robust warming will develop through the middle of next week, with more upper 80s and possibly low 90s across the North County. A late season low-pressure system may produce rain next Saturday. WILDFIRE DANGER RATINGS: Today's PG&E Fire Index Ratings are at low levels along the coastline, coastal valleys and in the inland valleys. Weather graphics and power outage information are available at: twitter.com/pge_john. Yesterday's Today's Tomorrow's Min Max Min Max Min Max 54.2° 71.2° 49.3° 57.0° 55.0° 57.0° PG&E Weather Office in San Francisco predicted temperatures for San Luis Obispo County Inland Temperatures, Paso Robles Actual Predicted Thu Fri Sat Sun Mon Tue Wed Thu Fri 43 87 47 83 48 72 42 76 44 84 49 89 53 91 51 86 48 79 Coastal Valleys Temperatures, San Luis Obispo Thu Fri Sat Sun Mon Tue Wed Thu Fri 48 77 50 72 50 65 46 68 48 76 52 81 53 80 53 74 51 71 WINDS: Gentle to moderate (8 to 18 mph) onshore winds will continue through tonight. Strong to gale-force (25 to 38 with gust to 45 mph) northwesterly winds are forecast on Saturday and Sunday, decreasing to fresh to strong (19 to 31 mph) levels on Monday. Moderate to fresh (13 to 24 mph) afternoon northwesterly winds are forecast on Tuesday into next Friday. DIABLO CANYON METEOROLOGICAL TOWER WIND DATA (back-up): Last night's Maximum Winds: Max peak winds: SE 14.0 mph @ 7:30 a.m. Max sustained wind: SE 11.0 mph @ 7:30 a.m. Yesterday's Maximum Winds: Max peak winds: NE 18.0 mph @ 10:15 a.m. Max sustained wind: NE 7.0 mph @ 10:15 a.m. SEAWATER TEMPERATURES: Intake seawater temperatures will range between 51 and 54 degrees through today, decreasing to 49 to 52 degrees on Saturday into Tuesday. OCEAN CURRENTS: Today's northerly (onshore) flowing current will continue to flow northward through tonight. A southerly (offshore) flowing current will develop on Saturday and will continue to flow southward through Tuesday. SEAWATER VISIBILITY: Seawater visibility was 12 to 14 feet at the Diablo Canyon Marina. ========================================================================== 24-Hour Ocean Condition Outlook for Friday 04/19 to Saturday 04/20 SWELL: DIR. NW HT. 4-6 PER. 8-14 This morning Remaining at: DIR. NW HT. 4-6 PER. 8-13 This afternoon Remaining at: DIR. NW HT. 4-6 PER. 8-12 Tonight WINDS: DIR. SE SPEED 5-10 This morning Increasing to: DIR. NW SPEED 10-15 This afternoon Decreasing to: DIR. NW SPEED 5-10 Tonight ========================================================================== 48-Hour Ocean Condition Outlook for Saturday 04/20 to Sunday 04/21 SEA/SWELL: DIR. NW HT. 6-8 PER. 5-12 Saturday morning Remaining at: DIR. NW HT. 6-8 PER. 5-12 Saturday afternoon Increasing to: DIR. NW HT. 7-9 PER. 5-12 Saturday night WINDS: DIR. NW SPEED 15-20 + 25 Saturday morning Increasing to: DIR. NW SPEED 25-35 + 45 Saturday afternoon Decreasing to: DIR. NW SPEED 20-25 + 35 Saturday night ========================================================================== Extended Ocean Condition Outlook: A 4- to 6-foot northwesterly (300-degree, deep-water) swell (with an 8- to 11-second period) is forecast on Tuesday into next Friday. ========================================================================== The 24 - Hour Ocean Data from the Diablo Canyon Waverider Buoy: MONTH DAY TIME SIG.HEIGHT PERIOD SWELL DIRECTION SST 04 14 1703 6.8 13 265 53.8 04 15 0503 5.7 13 265 51.3 04 16 0603 4.1 13 250 53.6 04 17 0333 6.9 11 272 51.1 04 18 1203 6.5 14 254 54.1 04 19 0703 5.0 13 268 55.8 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 -------------------------------------------------------------------------- 04 14 1703 194 15 3 23 137 592 215 215 337 459 04 15 0503 164 13 1 9 22 236 434 229 219 280 04 16 0603 127 13 1 4 13 50 298 273 184 80 04 17 0333 209 7 6 129 82 61 289 604 538 609 04 18 1203 198 13 1 11 57 299 498 465 255 492 04 19 0703 155 13 1 10 36 196 548 320 110 167 Daily Swell Inspection Program for today: NAME DAY TIME HEIGHT PERIOD SST (PST) (FEET) (SECONDS) (DEG. F) # 66 Ocean Station Papa 19 0703 7 9 43.2 # 05 West Washington State 19 0750 9 10 n/a # 02 West Oregon The buoy went adrift 02/09/19 # 06 SE Papa 19 0750 8 12 53.8 # 59 California 19 0750 7 12 55.2 # 44 Humboldt Bay Waverider 19 0733 6 13 54.0 # 29 Point Reyes Waverider 19 0733 7 14 54.5 # 42 San Francisco Sandbar 19 0700 4 13 55.8 # 15 Monterey Waverider Buoy 19 0703 5 13 54.1 # 28 Cape San Martin The buoy went adrift 04/04/19 # 76 DCPP Waverider 19 0703 5 13 55.8 # 22 Santa Lucia Escarpment 19 0733 6 13 57.9 # 11 Point Arguello 19 0750 5 13 55.4 # 63 Harvest Buoy 19 0733 6 12 54.9 # 19 San Nicolas Island 19 0733 6 13 57.6 # 20 Scripps 19 0702 2 5 63.0 # 33 Pearl Harbor Entrance 19 0700 3 6 76.5 # 04 SE Hawaii 19 0750 7 8 76.6 Precipitation at the Diablo Canyon Ocean Lab: Wednesday 1500 through Thursday 1500 0.00 inches Thursday 1500 through Friday 1500 0.00 inches Precipitation this rain season (July 1 - June 30): 18.27 inches Average season rainfall at DCPP to date: 18.45 inches Ocean Lab Barometer: 29.99 in/Hg or 1015.5 mb +0.4 mb (Rising) Today's Sunrise 6:26 AM Sunset 7:39 PM Tomorrow's Sunrise 6:24 AM Sunset 7:40 PM Tides: Low Tide High Tide AM PM AM PM 19 Friday 4:47 -0.4 4:41 0.6 10:57 4.6 10:53 5.7 20 Saturday 5:35 -0.7 5:18 1.1 11:51 4.3 11:28 5.7 21 Sunday 6:23 -0.7 5:56 1.7 ----- --- 12:49 4.0 22 Monday 7:14 -0.6 6:36 2.2 12:05 5.5 1:53 3.7 23 Tuesday 8:10 -0.4 7:24 2.6 12:44 5.2 3:09 3.4 24 Wednesday 9:11 -0.2 8:31 2.9 1:28 4.8 4:37 3.4 25 Thursday 10:17 0.0 10:09 3.0 2:22 4.4 6:00 3.5 26 Friday 11:23 0.2 11:46 2.8 3:33 4.1 6:56 3.7 ======================================================================== This day in weather history 1775 - The first engagement of the Revolutionary War took place under clear crisp weather at Lexington-Concord. (Sandra and TI Richard Sanders - 1987) 1973 - Glenrock, WY, received 41 inches of snow in just 24 hours, and a storm total of 58 inches, to establish two state records. (18th-20th) (David Ludlum) 2012 - A series of Southern Hemisphere swell trains are expected to arrive along the Central Coast from April 27 through early May. 2017 - Bill Coy's rain gauge located in the Santa Lucia mountains near Cayucos recorded 1.45 inches of rain since Sunday night. More importantly, his weather station has logged 57.10 inches this rain season, the most he's ever seen. His rain records go back to 1979. Rocky Butte is currently at 86.91 inches for the season which runs from July 1 to June 30. Dawn Dunlap at the Walter ranch recorded 1.90 inches of rainfall since Sunday, while Debby Mix at the Circle 3 Ranch in the San Simeon Creek Watershed has seen over 100 inches. Cal Poly (home of climatology for San Luis Obispo) has recorded more than 33 inches, or 150 percent of normal, for the entire rain season. Paso Robles Airport has seen 14.5 inches of rain. Generally, for the whole rain season, they receive 12.5 inches. Santa Maria Airport recorded 0.86 of an inch of rain on Tuesday. That broke the previous daily record for precipitation on April 18 of 0.54 of an inch set back in 1967. The Santa Maria Airport has recorded more than 18 inches this season. Typically, 13 inches of rain falls at that location. ======================================================================== 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