• This week's San Luis Obispo Tribune's Weather Watch Column Record-breaking 81.3-degree seawater temperatures along the Southern California coastline, are hurricanes far behind? http://www.sanluisobispo.com/news/weather/weather-watch/ • You can catch the live weather forecasts weekday mornings from 6-9 on the KVEC 920 AM on First Look with Andy Morris and Scott Taylor. • 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 Friday 08/17/18 =========== SEA/SWELL: A 2- to 4-foot northwesterly (300-degree, deep-water) sea and swell (with a 5- to 12-second period) is forecast along our coastline through tonight. A 3- to 5-foot northwesterly (290-degree, deep-water) swell (with an 8- to 11-second period) is forecast along our coastline on Saturday into next Friday. Arriving from the Southern Hemisphere: Today's 2- to 3-foot Southern Hemisphere (180-degree, deep- water) swell (with a 16- to 18-second period) will remain at this height into Saturday, gradually decreasing on Sunday into Monday. ATMOSPHERIC CONDITION: A classic August weather pattern with night and morning marine low clouds and fog in the coastal regions, triple- digit temperatures in the North County and afternoon thundershowers in the higher elevations of the Sierra Nevada will continue through Sunday. In other words, WYSIWYG (what you see is what you get) weather pattern. High temperatures today into Sunday will warm to triple- digit levels in the North County. The coastal valleys will reach the mid 80s, while the beaches will mostly be in the 60s. A low pressure system will approach the Pacific Northwest coast on Sunday and will shift the ridge of high pressure farther east. As the low deepens along the Oregon coast early next week, the marine layer will deepen and will produce extensive night and morning marine low cloudiness with areas of fog and drizzle and cooler temperatures. WILDFIRE DANGER RATINGS: Fuel moistures continue to remain drier than normal away from the coast. Fire index ratings are at low to medium- levels along the beaches and coastal valleys and at high levels in the inland valleys of San Luis Obispo and Santa Barbara Counties. However, the far northeastern region of San Luis Obispo County is at very-high levels. 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 59.4° 64.8° 59.1° 63.0° 58.0° 63.0° 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 58 96 60 102 58 101 54 100 54 93 51 93 52 96 53 96 Coastal Valleys Temperatures, San Luis Obispo Thu Fri Sat Sun Mon Tue Wed Thu 59 87 59 83 57 84 56 82 54 80 55 81 55 82 55 83 WINDS: A pattern of moderate to fresh (13 to 24 mph) northwesterly winds developing during the afternoon hours, decreasing during the night and morning hours will start today and will continue through Sunday. Fresh to strong (19 to 31 mph) afternoon northwesterly winds are forecast on Monday into next Friday. DIABLO CANYON METEOROLOGICAL TOWER WIND DATA: Today's Maximum Winds: Max peak winds: NW 20.1 mph @ 1:00 p.m. Max sustained wind: NW 15.2 mph @ 1:00 p.m. Yesterday's Maximum Winds: Max peak winds: NW 34.5 mph @ 6:00 p.m. Max sustained wind: NW 27.3 mph @ 6:00 p.m. SEAWATER TEMPERATURES: Intake seawater temperatures will range between 57 and 62 degrees through Sunday. Intake seawater temperatures will decrease to between 56 and 61 degrees Monday into next Friday. OCEAN CURRENTS: A northerly (onshore)flowing current is forecast through Sunday, becoming a southerly (offshore) flowing current on Monday into next Friday. SEAWATER VISIBILITY: Seawater visibility was 8 to 10 feet (plankton plume) at the Diablo Canyon Marina. ========================================================================== 24-Hour Ocean Condition Outlook for Friday 08/17 to Saturday 08/18 SEA/SWELL: DIR. NW HT. 2-4 PER. 5-13 This morning Remaining at: DIR. NW HT. 2-4 PER. 5-12 This afternoon Remaining at: DIR. NW HT. 2-4 PER. 5-12 Tonight (Combined with: DIR. S HT. 2-3 PER. 16-18 All day) WINDS: DIR. SE SPEED 10-15 This morning Increasing to: DIR. NW SPEED 20-25 + 30 This afternoon Decreasing to: DIR. NW SPEED 15-20 Tonight ========================================================================== 48-Hour Ocean Condition Outlook for Saturday 08/18 to Sunday 08/19 SWELL: DIR. NW HT. 3-5 PER. 7-12 Saturday morning Remaining at: DIR. NW HT. 3-5 PER. 8-11 Saturday afternoon Remaining at: DIR. NW HT. 3-5 PER. 8-11 Saturday night (Combined with: DIR. S HT. 2-3 PER. 15-17 All day Saturday) WINDS: DIR. SE SPEED 5-10 Saturday morning Increasing to: DIR. NW SPEED 15-20 + 25 Saturday afternoon Decreasing to: DIR. NW SPEED 5-10 Saturday night =========================================================================== Extended Ocean Condition Outlook: Fresh to strong (19 to 31 mph) afternoon northwesterly winds are forecast on Monday into next Friday. =========================================================================== The 24 - Hour Ocean Data from the Diablo Canyon Waverider Buoy: MONTH DAY TIME SIG.HEIGHT PERIOD SWELL DIRECTION SST 08 10 0930 3.3 14 215 57.0 08 11 0400 2.8 15 217 57.2 08 12 0900 3.8 11 226 58.6 08 13 2100 4.6 9 288 62.1 08 14 0500 3.8 15 229 61.2 08 15 0430 3.0 14 219 62.6 08 16 0430 2.8 20 215 59.9 08 17 1030 3.7 17 206 61.7 DCPP Ocean Lab Waverider Buoy Energy Spectral Analysis: mo. day time sig.ht. sig.per. energy (cm.sq.) (cm) (sec) 22+ 20 17 15 13 11 9 7 -------------------------------------------------------------------------- 08 10 0930 100 4 0 2 23 66 65 70 83 221 08 11 0400 85 4 0 2 12 52 46 69 60 130 08 12 0730 121 4 2 13 124 120 22 42 151 253 08 13 2100 141 9 1 6 55 119 60 63 410 248 08 14 0500 117 4 1 6 14 132 54 52 147 284 08 15 0430 91 4 1 8 9 73 97 37 31 201 08 16 0430 84 4 10 38 7 24 54 34 30 202 08 17 1030 113 4 1 39 83 36 49 104 59 352 Daily Swell Inspection Program for today: NAME DAY TIME HEIGHT PERIOD SST (PST) (FEET) (SECONDS) (DEG. F) # 06 SE Papa No Recent Report # 66 Ocean Station Papa 17 0403 6 6 55.8 # 36 South Nomad 17 0450 5 8 61.5 # 05 West Washington State 17 0450 4 19 n/a # 02 West Oregon 17 0425 6 17 63.9 # 59 California 17 0450 7 17 65.5 # 44 Humboldt Bay Waverider 17 0403 6 8 54.3 # 29 Point Reyes Waverider 17 0403 8 18 55.6 # 42 San Francisco Sandbar 17 0425 4 18 59.5 # 15 Monterey Waverider Buoy 17 0433 4 17 58.3 # 28 Cape San Martin 17 0430 6 17 59.0 # 76 DCPP Waverider 17 0430 4 17 61.7 # 22 Santa Lucia Escarpment 17 0415 6 17 61.7 # 11 Point Arguello 17 0420 5 17 63.5 # 63 Harvest Buoy 17 0425 6 17 63.0 # 19 San Nicolas Island 17 0400 7 17 71.2 # 20 Scripps 17 0450 2 17 75.9 # 33 Pearl Harbor Entrance 17 0400 2 15 80.8 # 04 SE Hawaii 17 0400 5 8 80.6 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): 0.03 inches Average season rainfall at DCPP to date: 0.00 inches Ocean Lab Barometer: 30.08 in or 1018.7 mb +0.4 mb (Rising) Today's Sunrise 6:24 AM Sunset 7:50 PM Tomorrow's Sunrise 6:25 AM Sunset 7:49 PM Tides: Low Tide High Tide AM PM AM PM 17 Friday 9:19 1.8 11:06 1.3 3:39 3.9 4:01 5.2 18 Saturday 10:19 2.3 ----- --- 5:17 3.6 4:59 5.2 19 Sunday 11:28 2.6 (12:23 1.0) 6:54 3.6 5:57 5.2 20 Monday 1:25 0.7 12:35 2.8 8:07 3.7 6:51 5.3 21 Tuesday 2:15 0.4 1:31 2.8 8:58 3.9 7:38 5.5 ======================================================================== This day in weather history 1915 - A hurricane hit Galveston, TX, with wind gusts to 120 mph and a twelve foot storm surge. The storm claimed 275 lives, including forty-two on Galveston Island, with most deaths due to drowning. Of 250 homes built outside the seawall (which was constructed after the catastrophic hurricane of 1900), just ten percent were left standing. 1969 - Camille, the second worst hurricane in U.S. history, smashed into the Mississippi coast. Winds gusted to 172 mph at Main Pass Block LA, and to 190 mph near Bay Saint Louis MS. The hurricane claimed 256 lives, and caused 1.3 billion dollars damage. Several ocean going ships were carried over seven miles inland by the hurricane. The hurricane produced winds to 200 mph, and a storm surge of 24.6 feet. Complete destruction occurred in some coastal areas near the eye of the hurricane. 2007 - Mostly clear and windy weather, except for areas of smoke from the 6-week-old Zaca Fire in Santa Barbara County, has developed along our coastline this morning. Smoke from the Zaca fire covers much of Santa Barbara, Ventura and Kern County this morning. ======================================================================== 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