• This week's San Luis Obispo Tribune's Weather Watch Column “SLO County saw below-average rainfall this season. What will the 2020 rain year bring?” 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 Friday 07/10/20 ========== SEA/SWELL: Today's 4- to 6-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 9-second period) will remain at this level through Saturday. A 5- to 7-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 8-second period) is forecast along our coastline on Sunday through Monday. A 3- to 5-foot northwesterly (295-degree, deep-water) swell (with an 8- to 11-second period) is forecast along our coastline on Tuesday, decreasing to 2 to 4 feet on Wednesday through next Friday. Arriving from the south: Southernly swell from Tropical Storm Cristina, which is expected to become a hurricane today about 600 miles southwest of Baja California, will arrive at the Diablo Canyon Waverider Buoy from an incoming direction of 160 degrees on Sunday. This direction is too far south-southeast to impact most of the Central Coast due to shadowing of Point Conception but will produce moderate surf in Southern California. ATMOSPHERIC CONDITIONS: The coastal stratus will clear this afternoon from most of beaches as fresh to strong (19 to 31 mph) northwesterly winds develop along the coastline. The marine layer will redevelop along the coastline and move inland tonight into Saturday morning with areas of fog and mist. Combined with the marine layer, will be variable high-level clouds that will move over the Central Coast from the southwest throughout the day. High pressure will build in from the desert Southwest today through Sunday. This condition will produce hot inland temperatures with Paso Robles reaching to triple-digit levels. In fact, Paso Robles will hit 102 degrees today, 104° on Saturday and 107° by Sunday. The coastal valleys will reach the mid to high-80s, while the beaches will remain in the 60s over this timeframe. A cooling trend will start Monday as the dome of high pressure responsible for the hot inland temperatures retreats back to the Four Corners area. A trough of low-pressure is expected to develop along the California Coast Wednesday into next Friday. This condition is expected to produce gentle to moderate (8 to 18 mph) southerly winds, seasonal temperatures, and marine low clouds along the coast. It may also bring subtropical moisture from former tropical cyclone Cristina over the Central Coast for increasing high-level clouds and relative humidity levels. 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 the Coastline and high (R3) levels in the Coastal Valleys and very high (R4) levels in the Inland Valleys and Far Inland Areas today. The PG&E Fire Index Ratings will be at high (R3) levels along the Coastline and very high (R4) levels in the Coastal and Inland Valleys and Far Inland Areas on Saturday. The PG&E Fire Index Ratings will be at high (R3) levels along the Coastline and very high (R4) levels in the Coastal and Inland Valleys and extremely high (R5) levels in the Far Inland Areas on Sunday. DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA: Yesterday's Today's Tomorrow's Min Max Min Max Min Max 50.8° 57.9° 51.6° 58.0° 54.0° 60.0° 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 50 97 54 102 53 104 54 107 57 95 52 86 50 86 51 85 52 87 Coastal Valleys Temperatures, San Luis Obispo Thu Fri Sat Sun Mon Tue Wed Thu Fri 52 76 52 82 54 83 54 87 57 78 54 75 54 74 55 75 55 77 WINDS: Fresh to strong (19 to 31 mph) northwesterly winds are forecast during the afternoon today into Monday, decreasing on Tuesday. Gentle to moderate (8 to 18 mph) southerly winds are expected on Wednesday through next Friday. DIABLO CANYON METEOROLOGICAL TOWER WIND DATA: Today's Maximum Winds: Max peak winds: SE 11.0 mph @ 4:00 a.m. Max sustained wind: SE 7.0 mph @ 4:00 a.m. Yesterday's Maximum Winds: Max peak winds: NW 26.0 mph @ 5:45 p.m. Max sustained wind: NW 19.0 mph @ 5:45 p.m. SEAWATER TEMPERATURES: Seawater temperatures will range between 52 and 55 degrees through Monday, increasing on Tuesday through next Friday. OCEAN CURRENTS: A southerly (offshore) flowing current is forecast through Monday, becoming a northerly (onshore) flowing current on Tuesday through next Friday. SEAWATER VISIBILITY: Seawater visibility was 10 to 12 feet at the Diablo Canyon Marina. ========================================================================== 24-Hour Ocean Condition Outlook for Friday 07/10 to Saturday 07/11 SEA/SWELL: DIR. NW HT. 4-6 PER. 5-9 This morning Remaining at: DIR. NW HT. 4-6 PER. 5-9 This afternoon Remaining at: DIR. NW HT. 4-6 PER. 5-9 Tonight WINDS: DIR. SE SPEED 5-10 This morning Increasing to: DIR. NW SPEED 20-25 + 35 This afternoon Decreasing to: DIR. NW SPEED 10-15 Tonight ========================================================================== 48-Hour Ocean Condition Outlook for Saturday 07/11 to Sunday 07/12 SEA/SWELL: DIR. NW HT. 4-6 PER. 5-9 Saturday morning Remaining at: DIR. NW HT. 4-6 PER. 5-9 Saturday afternoon Remaining at: DIR. NW HT. 4-6 PER. 5-9 Saturday night WINDS: DIR. SE SPEED 5-10 Saturday morning Increasing to: DIR. NW SPEED 20-25 + 30 Saturday afternoon Decreasing to: DIR. NW SPEED 5-10 Saturday night ========================================================================== Extended Ocean Condition Outlook: Gentle to moderate (8 to 18 mph) southerly winds are expected on Wednesday through next Friday. ========================================================================== The 24 - Hour Ocean Data from the Diablo Canyon Waverider Buoy: MONTH DAY TIME SIG.HEIGHT PERIOD SWELL DIRECTION SST 07 05 2330 7.7 9 288 54.1 07 06 1400 7.2 9 288 56.3 07 07 0130 6.7 8 296 53.0 07 08 0700 6.2 8 290 52.0 07 09 1330 4.5 9 293 55.8 07 10 0400 4.5 9 295 54.5 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 ------------------------------------------------------------------------- 07 05 2330 234 9 2 11 100 210 56 168 1236 601 07 06 1400 219 9 1 4 29 81 61 152 1040 774 07 07 0130 203 7 1 3 7 38 47 111 899 582 07 08 1330 153 9 1 1 4 14 19 134 493 471 07 10 0400 136 7 0 1 1 10 36 27 371 285 Daily Swell Inspection Program for today: NAME DAY TIME HEIGHT PERIOD SST (PST) (FEET) (SECONDS) (DEG. F) # 66 Ocean Station Papa No wave reports today. # 06 SE Papa The buoy at this station has gone adrift. # 05 West Washington State No wave reports today. # 59 California No wave reports today. # 44 Humboldt Bay Waverider 10 0408 2 6 53.1 # 94 Cape Mendocino 10 0432 3 14 53.8 # 29 Point Reyes Waverider 10 0403 6 7 50.0 # 42 San Francisco Sandbar 10 0430 4 7 56.1 # 15 Monterey Waverider Buoy 10 0430 8 8 54.3 # 28 Cape San Martin No wave reports today. # 76 DCPP Waverider 10 0430 5 9 54.5 # 22 Santa Lucia Escarpment 10 0400 7 9 57.9 # 11 Point Arguello No wave reports today. # 63 Harvest Buoy 10 0400 5 8 57.6 # 19 San Nicolas Island 10 0433 5 8 61.2 # 20 Scripps 10 0422 2 9 74.9 # 10 Waimea Bay, Hawaii 10 0400 4 8 79.7 # 33 Pearl Harbor Entrance 10 0400 4 14 80.6 # 04 SE Hawaii No wave reports today. 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): 0.00 inches Average season rainfall at DCPP to date: 0.00 inches Ocean Lab Barometer: 1015.0 or 29.98 in/Hg +2.0 mb (rising) Today's Sunrise 5:57 AM Sunset 8:19 PM Tomorrow's Sunrise 5:58 AM Sunset 8:19 PM Tides: Low Tide High Tide AM PM AM PM 10 Friday 8:45 0.3 9:14 2.7 1:32 4.6 3:51 4.2 11 Saturday 9:24 0.8 10:35 2.5 2:27 4.1 4:33 4.4 12 Sunday 10:04 1.3 11:54 2.1 3:36 3.6 5:12 4.6 13 Monday 10:46 1.7 ----- --- 5:04 3.2 5:49 4.8 14 Tuesday 12:58 1.6 (11:30 2.1) 6:39 3.1 6:25 5.1 15 Wednesday 1:49 1.1 12:17 2.4 8:00 3.2 7:01 5.3 16 Thursday 2:31 0.6 1:03 2.6 9:02 3.3 7:37 5.6 17 Friday 3:10 0.1 1:49 2.7 9:50 3.5 8:14 5.9 18 Saturday 3:47 -0.3 2:32 2.7 10:30 3.7 8:53 6.2 19 Sunday 4:23 -0.7 3:16 2.7 11:08 3.8 9:32 6.4 20 Monday 5:01 -0.9 4:00 2.6 11:44 3.9 10:14 6.4 21 Tuesday 5:39 -1.0 4:48 2.6 (12:22 4.1) 10:57 6.4 22 Wednesday 6:18 -1.0 5:40 2.5 (1:01 4.2) 11:43 6.1 23 Thursday 6:58 -0.8 6:39 2.4 ----- --- 1:42 4.4 24 Friday 7:39 -0.4 7:47 2.3 12:33 5.7 2:25 4.6 25 Saturday 8:21 0.1 9:05 2.0 1:30 5.1 3:10 4.9 26 Sunday 9:06 0.7 10:31 1.6 2:39 4.4 3:58 5.2 27 Monday 9:56 1.3 11:54 1.1 4:06 3.8 4:49 5.5 ======================================================================== This day in weather history 1913 - The mercury hit 134 degrees at Greenland Ranch in Death Valley, CA, the hottest reading of record for the North American continent. Sandstorm conditions accompanied the heat. The high the previous day was 129 degrees, following a morning low of 93 degrees. (David Ludlum) 2017 - Extensive monsoon moisture streaming from the southwest has mixed out the marine layer. Nonetheless, the marine influence will remain persistent today and will produce cooler temperatures throughout the Central Coast. ======================================================================== 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