• This week's San Luis Obispo Tribune's Weather Watch Column "What does a dry October and November mean for SLO County?" https://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 • 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 Monday 11/18/19 ======== SEA/SWELL: Today's 4- to 6-foot northwesterly (300-degree, deep water) swell (with a 7- to 12-second period) is forecast along our coastline through tonight. Strong to gale-force (25 to 38 mph) northwesterly winds will generate a 7 to 9 foot northwesterly (310-degree, deep water) sea and swell (with a 5- to 14-second period) on Tuesday, peaking Wednesday at 9 to 11 feet (with 7- to 12-second period). A 7- to 9-foot northwesterly (300-degree, deep water) swell (with an 8- to 17-second period) is forecast along our coastline on Thursday, decreasing to 6 to 8 feet (with a 16- to 20-second period) on Friday. A 7- to 9-foot northwesterly (300-degree, deep water) swell (with an 8- to 17-second period) is forecast along our coastline on Friday into Sunday. Strong to gale-force (25 to 38 mph) northwesterly winds will generate a 10 to 12 foot northwesterly (310-degree, deep water) sea and swell (with a 5- to 12-second period) next Monday and Tuesday. A prolonged period of higher northwesterly to west- northwesterly swell is expected to continue along our coastline through Thanksgiving Day. ATMOSPHERIC CONDITIONS: This morning's moderate to fresh (13 to 24 mph) Santa Lucia winds are producing clear skies throughout the Central coast. Today's high temperatures will range between the high 70s and mid-80s throughout the Central Coast. The winds will decrease and shift out of the northwest (onshore) by this afternoon. This condition will allow the marine layer with areas of fog and mist to develop in the coastal regions. Strong to gale-force (25 to 38 mph) northwesterly winds will develop along the coastline on Tuesday, decreasing Wednesday. A low-pressure system is forecast to produce increasing clouds and a few light rain showers on Wednesday into Thursday. Along the Central Coast, rainfall amounts are expected to be less than two-tenths of an inch. The majority of the rain is forecast to remain in Southern California and the Sierra Nevada. Partly cloudy skies and cool temperatures are forecast on Friday, followed by Santa Lucia winds and warmer temperatures next weekend. WILDFIRE INDEX RATINGS: The PG&E Fire Index Ratings will be at high (R3) to very high (R4) levels along the Coastline, Coastal and Inland Valleys and the Far Inland areas today. The PG&E Fire Index Ratings will be at high (R3) levels along the Coastline, Coastal and Inland Valleys and the Far Inland areas on Tuesday. The PG&E Fire Index Ratings will be at medium (R2) levels along the Coastline and Coastal Valleys and high (R3) levels in the Inland Valleys and the Far Inland areas on Wednesday. DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA: Yesterday's Today's Tomorrow's Min Max Min Max Min Max 60.5° 74.4° 58.9° 70.0° 55.0° 59.0° PG&E Weather Office in San Francisco predicted temperatures for San Luis Obispo County Inland Temperatures, Paso Robles Actual Predicted Sun Mon Tue Wed Thu Fri Sat Sun Mon 38 84 38 87 39 73 37 65 35 65 35 69 33 70 32 72 32 71 Coastal Valleys Temperatures, San Luis Obispo Sun Mon Tue Wed Thu Fri Sat Sun Mon 49 91 44 82 48 67 44 61 44 63 42 66 43 70 43 72 42 68 WINDS: This morning's moderate to fresh (13 to 24 mph) Santa Lucia winds will decrease later this morning and shift out of the northwest (onshore) this afternoon into Tuesday morning. Strong to gale-force (25 to 38 mph) northwesterly winds will develop along the coastline on Tuesday afternoon, decreasing on Wednesday. Gentle to moderate (8 to 18 mph) southerly winds are forecast on Thursday into Friday. DIABLO CANYON METEOROLOGICAL TOWER WIND DATA: Last night's Maximum Winds: Max peak winds: NE 18.0 mph @ 5:30 a.m. Max sustained wind: NE 11.0 mph @ 5:30 a.m. Yesterday's Maximum Winds: Max peak winds: NE 23.0 mph @ 4:15 p.m. Max sustained wind: NE 18.0 mph @ 4:15 p.m. SEAWATER TEMPERATURES: Intake seawater temperatures will range from 57 to 61 degrees through today, decreasing to 54 to 56 degrees Tuesday into Wednesday. OCEAN CURRENTS: A southerly (offshore) flowing current is forecast today through Wednesday. SEAWATER VISIBILITY: Seawater visibility was 7 to 9 feet at the Diablo Canyon Marina. ========================================================================== 24-Hour Ocean Condition Outlook for Monday 11/18 to Tuesday 11/19 SWELL: DIR. NW HT. 4-6 PER. 7-12 This morning Remaining at: DIR. NW HT. 4-6 PER. 7-12 This afternoon Remaining at: DIR. NW HT. 4-6 PER. 7-12 Tonight WINDS: DIR. NE SPEED 10-15 + 20 This morning Decreasing to: DIR. NW SPEED 10-15 This afternoon Decreasing to: DIR. NW SPEED 5-10 Tonight ========================================================================== 48-Hour Ocean Condition Outlook for Tuesday 11/19 to Wednesday 11/20 SEA/SWELL: DIR. NW HT. 5-7 PER. 7-12 Tuesday morning Increasing to: DIR. NW HT. 7-9 PER. 5-14 Tuesday afternoon Remaining at: DIR. NW HT. 7-9 PER. 5-14 Tuesday night WINDS: DIR. NW SPEED 10-15 Tuesday morning Increasing to: DIR. NW SPEED 25-30 + 40 Tuesday afternoon Decreasing to: DIR. NW SPEED 15-20 + 25 Tuesday night ========================================================================== Extended Ocean Condition Outlook: Strong to gale-force (25 to 38 mph) northwesterly winds will generate a 10 to 12 foot northwesterly (310-degree, deep water) sea and swell (with a 5- to 12-second period) next Monday and Tuesday. ========================================================================== The 24 - Hour Ocean Data from the Diablo Canyon Waverider Buoy: MONTH DAY TIME SIG.HEIGHT PERIOD SWELL DIRECTION SST 11 12 0433 3.7 13 258 59.9 11 13 1633 4.6 12 267 63.0 11 14 0503 4.2 11 276 59.0 11 15 1533 7.1 15 252 60.4 11 16 2333 7.4 14 265 57.2 11 17 0303 7.3 14 269 57.9 11 18 0703 4.8 11 288 58.6 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 --------------------------------------------------------------------------- 11 12 0433 114 13 1 8 24 88 186 143 60 144 11 13 1633 141 13 1 4 7 155 512 388 73 76 11 14 0503 129 11 1 1 13 53 292 495 136 39 11 15 1533 215 15 18 223 894 967 119 75 105 387 11 16 2333 224 15 5 28 118 835 664 438 306 352 11 17 0303 222 15 4 20 107 910 640 328 344 327 11 18 0703 145 7 1 5 13 42 106 286 279 256 Daily Swell Inspection Program for today: NAME DAY TIME HEIGHT PERIOD SST (PST) (FEET) (SECONDS) (DEG. F) # 66 Ocean Station Papa 18 0703 7 10 50.7 # 05 West Washington State 18 0740 10 12 n/a # 06 SE Papa 18 0750 10 11 64.2 # 59 California 18 0700 8 12 62.6 # 44 Humboldt Bay Waverider 18 0700 7 11 53.1 # 29 Point Reyes Waverider 18 0733 7 11 56.8 # 42 San Francisco Sandbar No data this morning # 15 Monterey Waverider Buoy 18 0703 6 8 57.6 # 28 Cape San Martin The buoy went adrift 04/04/19 # 76 DCPP Waverider 18 0703 5 11 58.6 # 22 Santa Lucia Escarpment 18 0703 5 13 59.2 # 11 Point Arguello 18 0750 6 11 60.3 # 63 Harvest Buoy 18 0750 5 13 60.1 # 19 San Nicolas Island 18 0733 6 12 61.9 # 20 Scripps 18 0722 2 10 62.9 # 33 Pearl Harbor Entrance 18 0700 2 13 81.1 # 04 SE Hawaii 18 0750 8 9 81.5 Precipitation at the Diablo Canyon Ocean Lab: Saturday 1500 through Sunday 1500 0.00 inches Sunday 1500 through Monday 1500 0.00 inches Precipitation this rain season (July 1 - June 30): 0.03 inches Average season rainfall at DCPP to date: 1.75 inches Ocean Lab Barometer: 29.94 in/Hg or 1013.7 -0.8 mb (lowering) Today's Sunrise 6:41 AM Sunset 4:56 PM Tomorrow's Sunrise 6:42 AM Sunset 4:55 PM Tides: Low Tide High Tide AM PM AM PM 18 Monday 7:35 3.3 9:06 -0.2 3:39 3.9 1:17 4.9 19 Tuesday 9:21 3.1 10:06 0.0 4:35 4.2 2:41 4.6 20 Wednesday 10:49 2.5 11:01 0.1 5:19 4.5 4:09 4.4 21 Thursday 11:57 1.8 11:50 0.3 5:56 5.0 5:29 4.3 ======================================================================== This day in weather history 1955 - An early season cold snap finally came to an end. Helena, MT, experienced 138 consecutive hours of subzero temperatures, including a reading of 29 below zero, which surpassed by seven degrees their previous record for the month of November. Missoula MT broke their November record by 12 degrees with a reading of 23 below zero, and Salt Lake City UT smashed their previous November record of zero with a reading of 14 below. Heavy snow in the Great Basin closed Donner Pass CA, and total crop damage from the cold wave amounted to eleven million dollars. (David Ludlum) 1987 - It was a windy day across parts of the nation. Gale force winds whipped the Great Lakes Region. Winds gusting to 80 mph in western New York State damaged buildings and flipped over flatbed trailers at Churchville. In Montana, high winds in the Upper Yellowstone Valley gusted to 64 mph at Livingston. Strong Santa Ana winds buffeted the mountains and valleys of southern California. (Storm Data) ======================================================================== 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