Active hazardous weather continues for the center of the nation with more severe thunderstorms and heavy rainfall today. Heat will linger across the southern Plains, then expand westward early in the week. The combination of heat and dry conditions will fuel fire weather concerns for the Four Corners region and across interior Alaska. Read More >
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492 FXUS66 KMTR 211220 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 520 AM PDT Sun Jun 21 2026 ...New AVIATION... .KEY MESSAGES... Updated at 1230 AM PDT Sun Jun 21 2026 - Hazardous beach conditions with increased risk of sneaker waves and strong rip currents continue through the extended forecast - Temperatures will increase through the middle of the week - Moderate HeatRisk concerns return midweek across the interior && .SHORT TERM... Issued at 1230 AM PDT Sun Jun 21 2026 (Today and tonight) Satellite imagery reveals stratus gradually expanding back across the area early this morning, although it is less extensive than the previous couple of nights at this time. Expect stratus to fill in along the coast and inland valleys by sunrise, then retreat back to the coast by late morning. The marine layer will compress further today as upper troughing along the coast weakens. This should keep more clouds along the coast this afternoon compared to the clearing experienced Saturday. Expect warmer temperatures in most areas this afternoon, especially across the interior which will warm as much as 5-10 degrees from Saturday. Highs will increase a few degrees along SF Bay shoreline, with little change right along the coast. This will place highs in the upper 50s to around 70 near the coast, with mid 70s to 80s in the interior, and the warmest spots reaching 90 degrees. Expect typical onshore breezes this afternoon and evening, with gusts 15-30 mph, strongest in gaps/passes. The marine layer will be around 1000-1500 feet deep tonight. This will allow low clouds to move back into inland valleys. The more compressed marine layer may allow patchy fog to develop along the coast and in wind-sheltered valleys. We continue to highlight a long-period southerly swell will bring a risk for sneaker waves and strong rip currents, with a Beach Hazards Statement out through Wednesday. If heading to the coast, stay back from the beach, and away from jetties, piers, beachside rocks, and other infrastructure near the water. Never turn your back to the ocean! For more information, see the BEACHES section. && .LONG TERM... Issued at 1230 AM PDT Sun Jun 21 2026 (Monday through Saturday) A building upper level ridge will keep the marine layer compressed and continue a warming trend through the middle of the week. Highs will warm a few degrees each day, reaching their peak on Wednesday. However, highs Tuesday and Thursday will also be quite warm and within a couple degrees of Wednesday`s readings. Marine influence should limit warming along the coast and bays with highs in the 60s and 70s, but this will still be several degrees warmer than today. Across the interior, highs will reach the 80s and 90s. Hot temperatures, especially inland, will be accompanied by pockets of Moderate HeatRisk with increased heat impacts. The trend still holds from the previous discussion that coverage of Moderate HeatRisk looks too limited for a Heat Advisory. However, hot temperatures may produce a risk for heat-related illnesses amongst sensitive populations, including children, the elderly, pregnant women, people with chronic illnesses, and people who work or live outdoors without access to adequate cooling or hydration. Latest ensemble guidance continues the trend of keeping moisture/instability rotating around the ridge to our east. This means thunderstorms next week are highly unlikely, but any potential will continue to be monitored. Late this week, temperatures trend cooler as an upper trough moves into the Pacific Northwest. It will remain dry in our area, but winds may become breezy as this system moves by to the north. && .AVIATION... (12Z TAFS) Issued at 448 AM PDT Sun Jun 21 2026 Cigs have lowered this morning near 700-1400ft with some areas seeing cigs below 500ft and vis reductions 4-6sm. Inland sites clearing later this morning near 17-19z with moderate to high confidence. Intermittent clearing closer to the coast, but some sites like KHAF and KMRY may not clear at all. Lower cigs returning after 02z Monday with less inland extent than this morning. Vicinity of SFO...MVFR locally IFR conditions until ~ 18Z this morning, improving to VFR thereafter. Stratus MVFR locally IFR returning after 04z Mon with moderate confidence on timing and cig heights. West wind 15 to 25 knots by 21z Sunday afternoon, easing to near 10 knots mid Sunday evening. SFO Bridge Approach...Similar to SFO. Better chance of intermittent BKN cigs occurring through the afternoon hours. Vicinity of SJC and OAK...VFR conditions occurring by 17-18z this morning. NW/W winds increasing after 21z 15-25 kts. Low clouds near 800-1200ft returning to OAK near 04z-05z Monday with moderate confidence. Lower confidence on cigs returning to SJC Monday morning. Monterey Bay Terminals...Stratus /MVFR/ continuing through the morning hours. Low to moderate confidence in any afternoon clearing near the immediate coast (MRY). Moderate to high confidence in MVFR cigs pushing inland after 02z Mon, becoming locally IFR after 05z Mon. Onshore winds 5 to 15 knots. && .MARINE... (Tonight through next Friday) Issued at 843 PM PDT Sat Jun 20 2026 Fresh to strong winds in the northern outer waters now through early Monday morning, leading to hazardous conditions for small craft. Otherwise, across the inner and outer waters winds will remain light to moderate. Long period southwest swell continues through the forecast period. && .BEACHES... Issued at 308 AM PDT Sat Jun 20 2026 Long period southerly swell at around 15 to 17 seconds will persist for the remainder of the weekend, and increase to 17 to 19 seconds by the middle of the upcoming work week as energetic storms in the Southern Hemisphere continue to affect the California coast, especially for south and southwest facing beaches. Hazardous beach conditions are advertised, specifically for moderate to steeply sloped beaches along the Pacific Coast of the North Bay, San Mateo, Santa Cruz counties. A Beach Hazards Statement for Pacific Coast beaches continues through Wednesday afternoon. Be sure to check beach conditions before you head out. Sneaker waves will run up the beach much farther than other waves, potentially catching beachgoers by surprise and resulting in people being swept into the water. Rip currents are strong enough to pull the strongest swimmers away from shore. Swim near a lifeguard if possible. Stay back from the beach, and away from jetties, piers, beachside rocks, and other infrastructure near the water. Never turn your back to the ocean! && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Beach Hazards Statement through Wednesday afternoon for CAZ006- 505-509-529-530. PZ...Small Craft Advisory until 3 AM PDT Monday for Pt Arena to Pt Reyes 10-60 NM. && $$ SHORT TERM...Tangen LONG TERM....Tangen AVIATION...APR MARINE...Malarkey Visit us at www.weather.gov/sanfrancisco Follow us on Facebook, X, and YouTube at: www.facebook.com/nwsbayarea x.com/nwsbayarea www.youtube.com/nwsbayarea |
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