Marine Weather and Tide Forecast for Penn Valley, CA

DISCUSSION

Today through Friday
Latest satellite imagery from GOES-West shows sunny skies across much of interior northern California with just a few high clouds passing over the northern areas and some cumulus over the mountains. Temperatures are currently trending around 3 to 6 degrees warmer than this time 24 hours ago. Upper level ridging over the Pacific Northwest is bringing continued warming and drying conditions to the region, along with light winds. Forecast highs will warm to the 70s to 80s for the Valley and foothills, and upper 50s to 70s in the mountains. Relative humidity will trend slightly lower today and Friday. A few stray showers or an isolated thunderstorm will be possible in the mountains south of US Highway 50 this afternoon, and again over the Sierra and Coast Range on Friday afternoon (up to 10 to 15 percent).

Saturday through Wednesday
Confidence continues to increase in a pattern change to unsettled weather over the weekend into early next week. Renewed precipitation chances are favored over this timeframe, in showers, high elevation mountain snow showers and thunderstorms. The latest forecast has the storm total precipitation trending slightly higher, with snow amounts trending slightly lower. Only minor snow accumulations are forecast at the highest peaks (up to 1 to 2 inches) with snow levels above the passes. The National Blend of Models (NBM) currently advertises a 10 to 20 percent chance of thunderstorms on Saturday and Monday, with a 20 to 40 percent chance on Sunday with best chances over higher terrain.
Model soundings are indicating Sunday afternoon and evening as the best potential for strong to severe thunderstorms. We will continue to evaluate the conditions as we get closer. Individuals should check back frequently for forecast updates at weather.gov.
Cooler temperatures and periodically breezy onshore winds can also be anticipated with this storm system. Precipitation tapers off on Tuesday with a few lingering showers over the mountains, with drier weather returning by Wednesday.

AVIATION
VFR conditions at TAF sites next 24 hours. Light surface winds generally 10 kts or less except in the Delta with west-southwest winds 10 to 15 kts. Isolated light showers may develop over the Sierra south of Highway 50 from 18Z-03Z Thursday, and again on Friday after 18Z in the Sierra and Coast Range.

STO WATCHES/WARNINGS/ADVISORIES
None.