Area Forecast Discussion
Issued by NWS Sacramento, CA
Issued by NWS Sacramento, CA
753 FXUS66 KSTO 202027 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1227 PM PST Mon Jan 20 2025 .SYNOPSIS... Gusty winds are expected through this evening before returning to dry weather and cold, foggy mornings over the next several days. && .DISCUSSION... Gusty winds are ongoing across NOrthern California, mainly 20-35 MPH, up to 45 MPH over the higher terrain of the foothills and Sierra. These winds will continue through this afternoon before trending down first in the Valley then elsewhere by early Tuesday AM. After Tuesday, ridging remains the dominant weather feature with troughing much further east, reducing the gradient and relaxing our winds over the next several days. This will keep things relatively quiet outside of cold mornings and patchy fog/frost. Valley lows are expected to be in the 30s through midweek with several sites at or near freezing, from roughly south of Yuba City or I-80 broadly. NBM chances show a 30-50% chance of temperatures below freezing tomorrow morning across parts of the Central Valley , highest along the eastern portions of the Valley and from the Delta to the Greater Sacramento Area. Additionally, models show just a 10-30% chance of dense fog tomorrow so conditions point to a less widespread fog development if anything in comparison to the previous nights. Valley highs will be in the upper 50s to low 60s each day with cooler temps as you increase in elevation. Hope you all had a restful holiday/holiday weekend! && .EXTENDED DISCUSSION (Friday THROUGH Monday)... Inside slider short wave trough predicted to drop into Interior NorCal Friday night into the weekend. Showers will be possible, mainly in the northern and eastern foothills with snow showers in the mountains during this period though amounts will be light. Currently, the NBM only shows a 40-60% chance of 0.25" or greater of precipitation at this time. Slight chance of showers (15-30%) in the Central Valley Saturday south of I-80. Additionally, this will bring breezy to windy conditions with cooler temperatures close to freezing in parts of the Valley. Drier weather returns early next week as the short wave trough pushes south of the CWA and upper ridging from the Pacific builds into NorCal. && .AVIATION... Areas of MVFR/IFR conditions with locally LIFR conditions in BR/FG are expected in Southern Sacramento and Northern San Joaquin Valleys and Delta after 04Z, otherwise VFR over interior NorCal next 24 hrs. In Central Valley, widespread northernly surface winds are forecast to be 15-20 kts with gusts to 25 kts through 04Z Tuesday. Surface winds are forecast to be 15-25 kts with local gusts up to 40 kts over foothills and mountains. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$