Marine Weather and Tide Forecast for Rio Vista, CA

DISCUSSION

Today through Tuesday

Current conditions across the area show higher level clouds in the northern portions of the forecast area around Redding with temperatures in the 70s. Winds have started to slowly increase across the Valley, with gusts of 20-25mph being reported near the Delta. We will continue to see the winds increase throughout the day, with gusts of 30-40mph possible within the Valley and Delta.
RH values will drop this afternoon when we get temperatures into the 80s for daytime highs. The low RH values combined with the breezy south to southwesterly winds bring elevated fire weather concerns to the Valley today. The highest chances lie in the northern Sacramento Valley where temperatures are warmer, winds are higher, and RH values are lower. Please do be mindful of any outdoor activities that involve fire/flame; the fuels will only continue to dry as we dive into the dry season.

Temperatures will slowly cool off on Tuesday, with highs in the 70s with filtered sunshine. Latest HIRES and NBM guidance has RH values improving tomorrow along with winds diminishing. This has been the case over the past several runs of the NBM. Thus, we decided to remove the Elevated Fire Weather concerns for Tuesday as forecasted conditions have improved. We will continue to monitor conditions across the area for any fire weather concerns Tuesday.

A low pressure system will track through the region on Tuesday bringing moisture to the higher elevation and potentially down into the foothills. Isolated shower and thunderstorm activity has been picked up in the NBM and HIRES guidance for Tuesday afternoon and evening. The highest chances lie around Shasta County and in the Sierra. Snow levels will be at 7000 feet, but will slowly drop toward 6000-7000 feet late Tuesday and into Wednesday. Areas south of Highway 50 in the Sierra at the higher elevations have the best chances to see snow. Accumulations are expected to be minor.

Wednesday and onward

The low pressure system continues to move through the region Wednesday and Thursday, with winds increasing out of the north.
Wind gusts of 25-35mph are possible on Wednesday, with the highest winds along and west of I-5 in the Sacramento Valley. The trend for the past couple of runs of the NBM have had RH Values increasing and winds being lighter across the region. This has allowed us to drop the Elevated Fire Weather concern headline for Wednesday. However, we will continue to monitor conditions and the latest HIRES guidance to see if any headlines are needed to be re-added for fire weather concerns on Wednesday.

Shower and isolated thunderstorms are possible in the mountains and foothills Wednesday and Thursday. A few of the storms could be on the stronger wide, with small hail and gusty winds possible.
There is a slight chance (less than 20 percent) for an isolated shower within the Valley Wednesday/Thursday. Chances for light snow at the highest elevations south of Highway 50 in the Sierra, with snow levels above 7000 feet Wednesday afternoon. Post Thursday, we will start to see temperatures increase slowly as the low pressure system exists the region.

AVIATION

VFR conditions are expected through the TAF period, with breezy south to southwesterly winds. Gusts of 25-35kts will be possible for the Sacramento sites, RDD, and RBL. Winds will be out of the north to northwest for SCK and MOD today, with a few gusts to 20kts. SCT to BKN clouds move through the region later this evening and overnight. Otherwise, winds go light and variable overnight and into tomorrow morning.

STO WATCHES/WARNINGS/ADVISORIES
None.