Marine Weather and Tide Forecast for American Canyon, CA

DISCUSSION

Pockets of high clouds stream across the Valley today but generally quiet weather conditions expected to continue. Temps will be fairly similar to Friday albeit a few degrees warmer through the Delta and greater Sacramento Area. Afternoon highs briefly cool Sunday before a warming trend ensues and we see Moderate HeatRisk develop across the Valley and foothills by midweek next week. Tuesday and Wednesday will be the hottest stretch with mid 90s to triple-digit highs expected, hottest over the northern Sacramento Valley. Daily onshore winds and active Delta breeze will help to give some relief with gusts up to 15-25 mph each day. Be sure to practice heat safety!

Our biggest area of concern will be monitoring the push of monsoonal moisture moving into our area Sunday into next week.
With it bring chances for showers and a mix of wet/dry thunderstorms across our area each day, with Monday - Tuesday as our widest impact days. There remains uncertainty regarding how low in elevation thunderstorms will occur with limiting factors of lack of available energy in the morning hours and antecedent cloud cover. We will continue to monitor precipitation developments and if nocturnal thunderstorms are expected into the Valley or near the Coastal Range for Tuesday AM.

Sierra thunderstorm chances start on Sunday, south of I-80, near 10-20%, then increase to 15-30% Monday-Tuesday along the crest with lingering chances [5-10%] on Thursday mainly south of Hwy 50. Main impacts with any developed storm will be lightning and new fire starts, gusty outflow winds, and brief rain showers. Overall, we are expected daily elevated fire weather conditions Sunday into Thursday with highest impacts Monday-Tuesday. Be sure to check back in with the forecast and have multiple ways to receive information, especially those with mountain travel and recreation plans.

AVIATION

General VFR conditions prevail across interior NorCal next 24 hours. Surface wind gusts from south to southwest around 10 to 20 kts in the Sacramento Valley, Delta and Sierra Crest, with northwesterly surface wind gusts around 10 to 20 kts in northern San Joaquin Valley through 06Z Sunday and again after 18Z Sunday.
Increasing mid to high level clouds will bring periods of BKN to OVC conditions around 10-25 kft along with virga and isolated shower potential Sunday. 10-20% chance of thunderstorms over the Sierra south of I-80 on Sunday after 18Z bringing local MVFR/IFR conditions with continued threat into next week.

STO WATCHES/WARNINGS/ADVISORIES
None.