Marine Weather and Tide Forecast for August, CA

DISCUSSION

Today through Saturday
Current GOES-West visible satellite imagery illustrates widespread cloud cover across much of interior northern California on this late Spring Friday morning as the system that has impacted the area over the past few days begins to taper off and exit the region. Some lingering showers will be possible over the mountains today but drier conditions are forecast elsewhere. High temperatures will still be below normal today, in the 70s in the Valley, 60s to 70s in the foothills, and 40s to 60s in the mountains.
Temperatures will gradually warm over the weekend and into next week. Saturday's forecast highs will trend around 5 to 10 degrees warmer than today, in the 80s in the Valley, 70s in the foothills and 50s to 60s in the mountains. Another wave will bring a slight chance for showers and thunderstorms on Saturday, to the mountainous areas north of Interstate 80, including portions of the Coast Range, Shasta County and southern Cascades. Dry conditions are expected elsewhere.

Sunday and onward
Locally breezy northerly flow will develop behind this wave on Sunday, bringing gusts of 15 to 20 mph in the Valley and Delta.
This will bring along some drying with lower humidity and warmer temperatures. As we head into the first week of June, weak ridging will bring a gradual warming trend to the area. Areas of Moderate HeatRisk return to the Valley next week. The Delta vicinity will see some late day and overnight relief/cooling as an increased onshore flow gradient will bring periods of breezy west to southwest flow, keeping those areas mainly in Minor HeatRisk.
Drier conditions and lower daytime humidity are also forecast, down to the mid teens to mid 20s in the Valley especially early to mid week. Towards the end of the week, ensembles are showing an upper level trough dropping down and moving across the Pacific Northwest into next weekend. While there is still some uncertainty with this, it does look like a cooling trend is then favored for the latter half of next week into the following weekend. Be sure to stay up to date with the latest forecasts at weather.gov!

AVIATION
Mostly VFR conditions over the next 24 hours except lingering low ceilings and isolated mountain showers will bring local MVFR and IFR conditions. Sustained surface winds generally less than 12 kts in the Valley, except the Delta with southwest gusts to 20-25 kts. 10-15% chance for isolated thunderstorms over the southern Cascades and Shasta County mountains after 18Z Saturday.

STO WATCHES/WARNINGS/ADVISORIES
None.