Marine Weather and Tide Forecast for Port Costa, CA

DISCUSSION
While the hottest temperatures of the week have passed, we're still expecting hot and well above normal temperatures to continue today, along with widespread Moderate HeatRisk and limited areas of Major HeatRisk. Valley temperatures in the majority of the Sacramento Valley will be in the high 90s to low 100s, highest in the northern Sacramento Valley. An Extreme Heat Warning remains in effect for the northern Sacramento Valley, adjacent terrain, and Butte County through 11pm this evening. The Sacramento area and Delta will remain cooler than the rest of the Valley, though still are expecting highs up to the low 90s today.

On Wednesday, a gradual cooling trend begins as upper level ridging begins to break down. Near to below normal high temperatures are expected through the weekend. While we're not expecting widespread precipitation with this pattern change, there is an increasing chance (15-25%) for isolated showers and thunderstorms along the Sierra crest on Thursday and into Friday.

Over the weekend, near to below normal temperatures are expected following the passage of an upper level trough. Warmer temperatures return early next week.

AVIATION
VFR conditions with clear skies over the next 24 hours. In the vicinity Delta, Westerly gusts up to 25-30 kts are possible through 18Z Wednesday. In the southern Sacramento Valley, west to southwest gusts 15 to 20 kts are possible between 00Z-06Z Wednesday. Sustained winds 12 kts or less elsewhere.

STO WATCHES/WARNINGS/ADVISORIES
Extreme Heat Warning until 11 PM PDT this evening for Butte County Below 1000 ft-N. Sac Valley in Tehama County-Shasta County Foothills 1000-3000 ft-Shasta Lake Area & 1-5 1000-3000 ft-Shasta Metro-Sierra (Tehama-Plumas) 1000-3000 ft-Tehama Co Coast Range Above 3000 ft-W Tehama Co Foothills 1000-3000 ft-W.
Shasta County 1000-3000 ft-W. Shasta County Above 3000 ft.