<<033109.txt>> At Pacific Gas and Electric company, we are committed to being an environmental leader and demonstrating this through our actions. We pledge to think creatively, work cooperatively and be results-oriented in our environmental stewardship efforts. http://www.pge.com/myhome/environment/ ============ PG&E DCPP Weather Forecast for Tuesday 03/31/09 =========== SEA/SWELL: This morning's 4 to 6 foot northwesterly (310-degree deep water) swell (with an 8-17 second period) will continue at this height and period through this afternoon, becoming a 5 to 7 foot northwesterly sea/swell (with a 5-11 second period) by tonight. Relentlessly strong to gale force (25-38 mph) northwesterly winds will generate an 8 to 10 foot northwesterly (320-degree deep water) sea/swell (with a 7-17 second period) on Wednesday and remaining at this height but with a shorter period through Thursday. This northwesterly sea/swell will further build to 9 to 11 feet (with a 7-12 second period) on Friday, becoming a 7 to 9 foot northwesterly swell (with an 8-11 second period) on Saturday. A 3 to 4 foot west-northwesterly (280-degree deep water) swell (with an 8-12 second period) will develop along our coastline on Sunday. Combined with Sunday's west-northwesterly swell will be 2 to 3 foot southwesterly (230-degree shallow water) seas on Sunday. Another round of 9 to 11 foot northwesterly (290-degree deep water) sea/swell (with a 5-17 second period) is forecast along our coastline on Monday through next Tuesday. Arriving from the southern hemisphere: A 1 foot southern hemisphere (190-degree deep) swell (with an 18-20 second period) will arrive on Saturday, increasing to 1 to 2 feet (with a 16-18 second period) on Sunday. ATMOSPHERIC CONDITION: Mostly clear weather with plenty of sunshine will continue through this afternoon. Today's high temperatures will reach into the low to mid 70s in our coastal valleys and inland areas. Along the coast, temperatures will range between the low 60s to the mid 60s. A series of short-wave troughs will continue to slide southeastward into the Great Basin as the strong eastern Pacific high remains nearly stationary, centered about 1,000 miles off the California coastline. This condition will produce strong to gale force (25-38 mph) northwesterly winds, cooler temperatures and areas of coastal low clouds as well as fog late tonight through Friday. These short-wave troughs could also produce a minor dusting of snow in the Central Sierra on Thursday night into early Friday. The winds will decrease and the temperatures will increase on Saturday producing spectacular early spring weather. The eastern Pacific high is forecast to move about 600 miles further westward over the weekend, allowing the jet stream to shift southward towards our area. This condition should allow a low pressure system to approach our area late Sunday night into Monday. This system should produce some April rain showers across our area and some Sierra snowfall, but rainfall amounts are expected to be light. This system will be followed by unsettled weather towards the end of next week. DIABLO CANYON AIR TEMPERATURES: Diablo Canyon Meteorological Tower Air Temperature Data Yesterday's Today's Tomorrow's Min Max Min Max Min Max n/a n/a 51.8° 62.0° 51.0° 57.0° PG&E San Francisco Met Office predicted temps: Inland Temperatures, Paso Robles Tue Wed Thu Fri Sat Sun Mon Tue 34 76 40 74 41 69 40 66 36 70 40 65 40 64 37 69 Inland Temperatures, San Luis Obispo Tue Wed Thu Fri Sat Sun Mon Tue 41 70 46 71 46 64 44 63 41 68 44 63 42 60 44 67 WINDS: Light to gentle variable winds are forecast to continue through this morning, increasing out of the northwest this afternoon. Strong to gale force (25-38 mph) northwesterly winds will develop tonight and will continue at this level through Friday. The northwesterly winds will decrease on Saturday. Increasing southerly winds are forecast on Sunday and Monday, followed by increasing northwesterly winds next Tuesday. Today's winds: Max peak winds: SE 14.6 mph at 9:30 a.m. Max sustained wind: SE 11.4 mph at 9:30 a.m. Yesterday's Winds: Max peak winds: n/a Max sustained wind: n/a SEAWATER TEMPERATURES: The Diablo Canyon waverider buoy is reporting a temperature of 52.2 degrees, while the AWAC current meter is reporting a temperature of 50.5 degrees this morning. Intake seawater temperatures will range between 49° and 51° through today, decreasing to 48° to 50° on Wednesday through Friday. OCEAN CURRENTS: The Diablo Canyon AWAC current meter and CODAR stations are reporting a southerly (offshore) flowing current today. This southerly (offshore) flowing current is expected to continue to flow southward through Friday. SEAWATER VISIBILITY: Seawater visibility was 15 to 17 feet at the Diablo Canyon Intake. ========================================================================== 24-Hour Ocean Condition Outlook for Tuesday 03/31 to Wednesday 04/01 Sea/Swell: DIR. NW HT. 4-6 PER. 7-11 This morning Remaining at: DIR. NW HT. 4-6 PER. 7-11 This afternoon Increasing to: DIR. NW HT. 5-7 PER. 7-11 Tonight WINDS: DIR. VAR. SPEED 5-10 This morning Increasing to: DIR. NW SPEED 15-20 This afternoon Increasing to: DIR. NW SPEED 20-25 + 30 late afternoon Remaining at: DIR. NW SPEED 20-25 + 30 Tonight =========================================================================== 48-Hour Ocean Condition Outlook for Wednesday 04/01 to Thursday 04/02 Sea/Swell: DIR. NW HT. 8-10 PER. 7-18 Wednesday morning Remaining at: DIR. NW HT. 8-10 PER. 7-17 Wednesday afternoon Remaining at: DIR. NW HT. 8-10 PER. 7-16 Wednesday night WINDS: DIR. NW SPEED 15-20 + 30 Wednesday morning Increasing to: DIR. NW SPEED 25-30 + 40 Wednesday afternoon Decreasing to: DIR. NW SPEED 20-25 + 35 Wednesday night ========================================================================== Extended Ocean Condition Outlook: Spring rain showers are forecast on Sunday night into Monday. ========================================================================== The 24 - Hour Ocean Data From The Diablo Canyon Wave rider Buoy MONTH DAY TIME SIG.HEIGHT PERIOD SWELL DIRECTION SST (PST) (FEET) (SECONDS) (TRUE) (DEG. F) 03 28 1012 6.0 11 291 52.0 03 29 2112 10.4 13 275 52.7 03 30 0212 10.5 11 279 50.9 03 30 0512 8.6 12 277 53.4 03 31 0342 5.0 11 278 52.2 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 --------------------------------------------------------------------- 03 29 1012 263 9 3 3 20 228 350 394 1515 788 03 29 2112 317 11 4 7 24 204 1541 1689 1326 736 03 30 0212 319 11 5 6 22 131 1268 2274 1159 510 03 30 0512 263 11 2 5 14 145 795 1388 875 431 03 31 0342 153 11 1 5 2 21 79 461 392 230 Daily Swell Inspection Program NAME DAY TIME HEIGHT PERIOD SST (PST) (FEET) (SECONDS) (DEG. F) # 06 SE PAPA 600NM West Eureka 31 0350 5 5 54.0 # 59 California Buoy (Now Adrift) (No Recent Reports) # 01 Point Reyes Waverider 31 0321 8 8 49.5 # 42 Monterey Waverider Buoy 31 0306 6 11 50.5 # 28 Cape San Martin, Ca 31 0350 8 10 53.6 # 50 DCPP Waverider Buoy, Ca 31 0342 5 11 52.2 # 71 Harvest Platform, Ca 31 0330 8 12 52.7 * NOTE: Height (significant swell height) is the average height of the waves in the top third of the wave record. Maximum wave heights may be up to TWICE the height in the data shown in the above table. Precipitation at the Diablo Canyon Ocean Lab Sunday 1500 through Monday 1500 0.00 inches Monday 1500 through Tuesday 1500 0.00 inches Precipitation this rain season (July 1 - June 30): 8.29 inches Average season rainfall at DCPP to date: 22.00 inches Ocean Lab Barometer: 30.07 in/Hg or 1018.4 mb -0.5 mb (Falling) Sunrise and Sunset: Today's Sunrise 6:51 AM Sunset 7:24 PM Tomorrow's Sunrise 6:49 AM Sunset 7:25 PM Tides: Low Tide High Tide AM PM AM PM 31 Tuesday 8:54 -0.3 7:23 2.7 1:07 5.5 7:23 2.7 1 Wednesday 10:10 -0.3 8:51 2.9 2:05 5.3 5:46 3.2 2 Thursday 11:25 -0.4 10:50 2.9 3:22 5.0 6:52 3.5 3 Friday ----- --- 12:29 -0.5 4:49 4.9 7:34 3.8 4 Saturday 12:24 2.4 1:22 -0.5 6:11 4.9 8:08 4.2 5 Sunday 1:31 1.8 2:07 -0.4 7:20 4.9 8:40 4.6 6 Monday 2:27 1.1 2:46 -0.2 8:20 4.8 9:10 5.0 7 Tuesday 3:15 0.5 3:21 0.2 9:14 4.7 9:39 5.3 ========================================================================= This day in weather history 1954 - The temperature at Rio Grande City, TX, hit 108 degrees, which for thirty years was a U.S. record for the month of March. 1990 - The month of March went out just as it came in, like a lamb. Marquette MI, which started the month with a record high of 52 degrees, equaled their record for the date with a reading of 62 degrees. (The National Weather Summary) ========================================================================= 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. 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