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192 FXUS66 KSTO 210458 AFDSTO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SACRAMENTO CA 955 PM PDT Wed Aug 20 2014 .Synopsis... Near to slightly cooler than normal temperatures expected through the weekend and into early next week. A slight chance of thunderstorms will be possible over the Sierra Nevada to the south of Lake Tahoe into early this evening. && .Discussion... Fog product indicates the low clouds have already spread into the Carquinez Strait area...and with the Ft Ord profiler showing the marine layer up to around 2600 ft...some stratus should advect/form in the Srn Sac Vly by morning...or at least become banked-up against the foothills to the E of SAC. Onshore gradients suggest the Delta Breeze will weaken overnite...but will increase again Thu afternoon with little change in temps/thicknesses. The Breeze may not extend as far N as it did today due to the weaker up-valley flow as the surface pressure pattern indicates the low center will be farther E into Ern NV and slightly weaker. Thus...we have updated this evening to lower the max temps primarily in the valley for Thu...as the Marine/Delta influence is expected to maintain cooler than normal temps over the valley/lower elevations. JHM .Previous Discussion... A trough drops down into the Pacific Northwest and into Northern California on Friday and shifts to the east over the weekend leaving Northern California generally in Northwesterly flow aloft between the ridge over the Eastern Pacific and trough over the Western U.S. Temperatures will be a little cooler on Friday with highs in the low 80s to low 90s in the Valley and 60s and 70s in the mountains. Temperatures may be similar to a few degrees warmer on Saturday. No precipitation is expected Friday into the weekend. && .Extended Discussion (Sunday through Wednesday) Dry northwesterly flow will remain over the area through the extended period as high pressure remains off the coast. Expect benign weather and near normal temperatures to continue through the early portions of next week. Dang && .Aviation... Mainly VFR conditions the next 24 hours across interior Northern California. MVFR/IFR ceilings will continue along the western Delta through Thursday morning, with a slight chance of stratus moving toward Sacramento TAF sites Thu morning. Isolated Thunderstorms possible Sierra crest south of Tahoe this afternoon and evening. South to west winds 10-15 kt except near the delta southwest winds 15-25 knots. Winds will be diminishing this evening and tonight. Dang && .STO Watches/Warnings/Advisories... None. && $$