• I will be giving a presentation about climate change and what it means for our local weather at the Santa Maria Public Library, 421 S McClelland St., on Friday, Jan. 24, from 3:30 to 4:30 p.m. with time for questions afterward. All are welcome, including families. This talk is sponsored by the Santa Maria branch of the American Association of University Women (AAUW) and the Santa Maria Public Library. • 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 01/22/20 ======== SEA/SWELL: This morning's 8- to 10-foot northwesterly (295-degree, deep-water) swell (with an 8- to 17-second period) will decrease to 6 to 8 feet (with an 8- to 14-second period) tonight. A 4- to 6-foot northwesterly (300-degree, deep-water) swell is expected along our coastline on Thursday. An 8- to 10-foot west-northwesterly (285-degree, deep-water) sea and swell (with a 5- to 21-second period) will develop along our coastline on Friday and will remain at this height but (with a 15- to 17-second period) on Saturday. A 5- to 7-foot northwesterly (295-degree, deep-water) sea and swell (with a 5- to 21 second period) is forecast along our coastline on Sunday, building to 10 to 12 feet (with a 5- to 17-second period) on Monday. This northwesterly (295-degree, deep-water) sea and swell will decrease to 8 to 10 feet (with a 5- to 15-second period) next Tuesday and Wednesday. A higher-energy west-northwesterly swell is forecast to arrive along our coastline on January 30 into February 2. ATMOSPHERIC CONDITIONS: A weak cold front is falling apart over San Luis Obispo county this morning and is producing gentle to moderate (8 to 18 mph) southerly winds and a few sprinkles or light rain showers. Moderate to fresh (13 to 24 mph) northwesterly winds and partly cloudy skies are forecast this afternoon and tonight. High pressure will build over the California on Thursday through Saturday morning. This condition will produce moderate to fresh (13 to 24 mph with gust to 35 mph) Santa Lucia (northeasterly) winds and mostly sunny skies. High temperatures in the coastal valleys will increase to the low 70s on Thursday, Friday and Saturday. Moderate to fresh (13 to 24 mph) northwesterly (onshore) winds on Saturday afternoon and night will allow the marine layer to develop along beaches and coastal valleys Another weak cold front will bring gentle to moderate (8 to 18 mph) southerly winds, increasing clouds and a few rain showers on Sunday morning. The cold front will be followed by strong to gale-force (25 to 38 mph) northwesterly winds and partly clouds skies on Sunday afternoon through next Wednesday. The long-range models and charts indicate dry weather will continue through the second week of February. WILDFIRE INDEX RATINGS: The PG&E Fire Index Ratings will be at medium (R2) levels along the Coastline, Coastal and Inland Valleys and Far Inland Areas, expect for 575 and 582 which will be at low (R1) levels today. DIABLO CANYON METEOROLOGICAL TOWER TEMPERATURE DATA: Yesterday's Today's Tomorrow's Min Max Min Max Min Max 52.6° 58.5° 51.2° 61.0° 52.0° 67.0° 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 43 62 43 62 41 65 42 66 41 66 43 61 40 61 37 62 37 62 Coastal Valleys Temperatures, San Luis Obispo Tue Wed Thu Fri Sat Sun Mon Tue Wed 45 61 43 66 47 70 47 70 46 70 46 62 44 64 42 65 43 65 WINDS: Moderate to fresh (13 to 24 mph) northwesterly winds are forecast this afternoon. Moderate to fresh (13 to 24 mph) Santa Lucia (northeasterly) winds are forecast on Wednesday night through Saturday morning. Moderate to fresh (13 to 24 mph) northwesterly (onshore) winds are forecast on Saturday afternoon and night. Strong to gale-force (25 to 38 mph) northwesterly winds and are forecast on Sunday afternoon through next Wednesday. DIABLO CANYON METEOROLOGICAL TOWER WIND DATA: Last night's Maximum Winds: Max peak winds: SE 7.0 mph @ 4:15 a.m. Max sustained wind: SE 4.0 mph @ 4:15 a.m. Yesterday's Maximum Winds: Max peak winds: NW 16.0 mph @ 5:30 p.m. Max sustained wind: NW 11.0 mph @ 5:30 p.m. SEAWATER TEMPERATURES: Intake seawater temperatures will range from 54 and 57 degrees through Sunday, decreasing to 52 to 55 degrees next week. OCEAN CURRENTS: A northerly (onshore) flowing current will continue to flow northward through this morning. A southerly (offshore) flowing current is forecast this afternoon through next week. SEAWATER VISIBILITY: Seawater visibility was 2 to 3 feet at the Diablo Canyon Marina. ========================================================================== 24-Hour Ocean Condition Outlook for Wednesday 01/22 to Thursday 01/23 SWELL: DIR. NW HT. 8-10 PER. 8-15 This morning Decreasing to: DIR. NW HT. 7-9 PER. 8-15 This afternoon Decreasing to: DIR. NW HT. 6-8 PER. 8-14 Tonight WINDS: DIR. SE SPEED 10-15 This morning Increasing to: DIR. NW SPEED 15-20 + 25 This afternoon Remaining at: DIR. NE SPEED 15-20 + 25 Tonight ========================================================================== 48-Hour Ocean Condition Outlook for Thursday 01/23 to Friday 01/24 SWELL: DIR. NW HT. 5-7 PER. 8-15 Thursday morning Decreasing to: DIR. NW HT. 4-6 PER. 8-15 Thursday afternoon Remaining at: DIR. NW HT. 4-6 PER. 8-23 Thursday night WINDS: DIR. NE SPEED 15-20 + 35 Thursday morning Decreasing to: DIR. N SPEED 10-15 Thursday afternoon Increasing to: DIR. NE SPEED 15-20 + 25 Thursday night ========================================================================== Extended Ocean Condition Outlook: A higher-energy west-northwesterly swell is forecast to arrive along our coastline on January 30 into February 2. ========================================================================== The 24 - Hour Ocean Data from the Diablo Canyon Waverider Buoy: MONTH DAY TIME SIG.HEIGHT PERIOD SWELL DIRECTION SST 01 16 1833 9.1 13 269 56.3 01 17 0633 7.2 12 271 56.3 01 18 0133 5.3 11 271 55.4 01 19 2003 6.5 14 261 55.0 01 20 0703 6.7 13 269 55.4 01 21 2233 9.0 17 261 56.1 01 22 0133 9.7 17 255 57.2 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 --------------------------------------------------------------------------- 01 16 1833 276 4 2 8 9 106 718 482 1079 1255 01 17 0633 220 11 1 6 11 95 484 822 736 366 01 18 0133 161 11 1 7 9 40 182 681 371 139 01 19 2003 198 15 3 13 263 769 590 440 166 82 01 20 0703 204 13 2 7 37 288 1219 485 408 92 01 21 2233 274 17 26 329 1324 1312 669 449 280 182 01 22 0133 297 17 17 116 1926 926 1065 805 419 141 Daily Swell Inspection Program for today: NAME DAY TIME HEIGHT PERIOD SST (PST) (FEET) (SECONDS) (DEG. F) # 66 Ocean Station Papa 22 0433 9 7 46.0 # 06 SE Papa The buoy at this station has gone adrift. # 05 West Washington State 22 0440 12 11 n/a # 59 California 22 0450 12 13 n/a # 44 Humboldt Bay Waverider 22 0433 9 13 51.8 # 94 Cape Mendocino 22 0432 11 13 52.7 # 29 Point Reyes Waverider 22 0403 14 14 54.5 # 42 San Francisco Sandbar 22 0430 9 14 52.5 # 15 Monterey Waverider Buoy 22 0430 12 14 55.0 # 28 Cape San Martin 22 0450 13 15 55.2 # 76 DCPP Waverider 22 0133 10 17 57.2 # 22 Santa Lucia Escarpment 22 0433 12 15 55.6 # 11 Point Arguello 22 0450 11 16 55.9 # 63 Harvest Buoy 22 0450 10 15 58.1 # 19 San Nicolas Island 22 0433 12 17 56.8 # 20 Scripps 22 0422 3 13 59.7 # 10 Waimea Bay, Hawaii 22 0400 4 10 72.7 # 33 Pearl Harbor Entrance 22 0400 3 9 77.4 # 04 SE Hawaii 22 0450 9 12 77.4 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): 7.17 inches Average season rainfall at DCPP to date: 9.50 inches Ocean Lab Barometer: 1023.5 mb or 30.23 in/Hg -0.5 mb (lowering) Today's Sunrise 7:08 AM Sunset 5:21 PM Tomorrow's Sunrise 7:08 AM Sunset 5:22 PM Tides: Low Tide High Tide AM PM AM PM 22 Wednesday 1:25 2.5 3:06 -1.0 7:40 6.2 9:51 3.9 23 Thursday 2:13 2.5 3:44 -1.0 8:21 6.2 10:28 4.0 24 Friday 2:56 2.5 4:20 -0.9 9:00 6.1 11:03 4.0 25 Saturday 3:36 2.5 4:55 -0.7 9:38 5.9 11:36 4.0 26 Sunday 4:16 2.4 5:27 -0.5 10:14 5.6 ----- --- 27 Monday 4:57 2.4 5:59 -0.1 12:09 4.0 (10:50 5.3) 28 Tuesday 5:42 2.4 6:30 0.3 12:42 4.1 (11:28 4.8) 29 Wednesday 6:34 2.4 7:00 0.7 1:16 4.1 12:09 4.3 30 Thursday 7:37 2.4 7:32 1.2 1:52 4.2 12:58 3.8 ======================================================================== This day in weather history 1986 - A twelve day siege of heavy rain and snow, which produced widespread flooding and mudslides across Northern and Central California, finally came to an end. Bucks Lake, located in the Sierra Nevada Range, received 49.6 inches of rain during the twelve day period. (Storm Data) 2017 - The Diablo Canyon meteorological tower reported sustained southeasterly winds of 40.3 mph with gust to 51.5 mph at 6 a.m. this morning. Strong upper-level winds will strengthen a 970 millibar low pressure system off Northern California. The associated cold front will move through the Central Coast between 10 a.m. and 12 p.m. today. This cold front will tap into a plume of subtropical moisture and will produce moderate gale-force to fresh gale- force (32 to 46 mph) southerly winds along the coastline and heavy rain through 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 or any questions, please send an email to PGEweather@pge.com.