Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA

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000 FXUS66 KMTR 291144 AFDMTR Area Forecast Discussion National Weather Service San Francisco Bay Area 444 AM PDT Sat Apr 29 2017 .SYNOPSIS...Seasonably warm weekend in store for the Bay Area and Central Coast. Another round of offshore winds Monday and Tuesday will drive temperatures even warmer early next week with daytime highs into the 80s with some lower 90s for the warmest interior valleys. Cooling trend back to normal by Thursday and Friday as the next trough arrives. && .DISCUSSION...as of 3:09 AM PDT Saturday...Skies are clear early this morning with a still strong 6.5 mb northerly gradient down the coast from Arcata to SFO. Gusty northeast winds are still showing up across the area hills with gusts currently in the 25-30 mph range. These offshore winds will ease by mid morning as the radiative inversions mix out. This will set the stage for an ideal Bay Area Saturday with highs well into the 70s and some lower 80s away from the coast. Even the beaches will stay sunny with 70s found just a few miles inland. Given the dry airmass temperatures will cool into the 40s and lower 50s tonight with lighter winds aloft allowing for better radiative cooling. Sunday looks like a near repeat of Saturday with sunny and seasonably warm temperatures in place. A shortwave diving into the Great Basin late Sunday night into Monday morning will increase surface pressure gradients once again. This will initiate another round of offshore winds for the hills early Monday morning and then again Tuesday morning. 850 mb temps around 12 celsius this morning will warm to 15-16 celsius by Monday morning with these offshore winds in place. Thus expect noted warming early next week with 850 mb temps forecast to reach 17-18 celsius by Weds. These type of temps aloft with light offshore flow and a thermal trough along the coast should translate into some of the warmest weather so far this spring with daytime highs well into the 80s and even some lower 90s for the warmest inland valleys. Cooling trend should begin in earnest by Thursday, at least near the coast with widespread inland cooling back to near or even below normal by next Friday as the next (mainly dry) trough arrives along the Northern California coast. In the meantime after a long and wet winter the next week looks to bring some ideal spring time weather to not only the Bay Area but much of the state. && .AVIATION...As of 10:35 PM PDT Friday...For 12z Tafs. VFR. Northerly winds this morning with increasing onshore winds in the afternoon. Winds will generally be weaker today than yesterday, peaking in the upper teens. Mostly clear skies today, with some low stratus clouds possible late tonight. Vicinity of KSFO...VFR. North winds will become westerly by the afternoon/evening, ranging 10-20kt through the afternoon/evening. Some low clouds possible late tonight. SFO Bridge Approach...Similar to KSFO. Monterey Bay Terminals...VFR. Light and variable winds, becoming light to moderate westerly winds on Saturday afternoon. && .MARINE...as of 04:40 AM PDT Saturday...Strong, gusty northwest winds will persist through the weekend as high pressure remains offshore. The strongest gusts may occasionally be gale force, especially later this afternoon and evening. The strong winds will also drive hazardous seas in the form of steep fresh swell with short periods. && .MTR WATCHES/WARNINGS/ADVISORIES... .Tday...SCA...Pigeon Pt to Pt Pinos 0-10 nm SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm SCA...Pt Arena to Pigeon Pt 10-60 nm SCA...Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA...Pt Arena to Pt Reyes 0-10 nm from 9 AM SCA...Pt Reyes to Pigeon Pt 0-10 nm from 3 PM SCA...Mry Bay from 3 PM && $$ PUBLIC FORECAST: RWW AVIATION: DRP MARINE: DRP Visit us at www.weather.gov/sanfrancisco Follow us on Facebook, twitter, and youtube at: www.Facebook.com/nwsbayarea www.twitter.com/nwsbayarea www.youtube.com/nwsbayarea

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