Marine Weather and Tide Forecast for Portola, CA

DISCUSSION

Current radar imagery shows a line of showers progressing across the northern portion of the central valley of California. Light showers are expected to fall over Lassen county of NE CA and in far northern Washoe county along the OR border. As day turns to night, shower chances across the Tahoe Basin increase, though remain less than 35%. Last night's 12Z sounding out of Reno shows low level dry air, which will inhibit significant rainfall out of the showers today. QPF values top out at a couple hundredths at best; virga will likely be the precipitation type for today.

Along with the light rain, we are expecting gusty winds across the area. As such, Lake Wind Advisories have been hoisted for many lakes, including Donner Lake, Topaz Lake, and Eagle Lake, among others. Please see the product at www.weather.gov/reno for more details. Gusts up to 40 mph are expected areawide, with wind prones gusting upwards of 45 mph and ridges upwards of 50 mph.
These enhanced winds will bring a couple hours of elevated fire weather conditions for the Basin and Range where lower humidity values reside. Additionally, blowing dust downwind of desert playas and sinks may reduce visibilities along I-80 and US-50 east of Fernley and Fallon, respectively.

Showers are expected to continue through the overnight hours into early Tuesday. At that point, a stray shower will be possible over Pershing and Churchill counties. As mentioned previously, chances for accumulating rainfall remain little to none. Wednesday and beyond, we warm up and dry out with earnest. Afternoon highs will reach the low 90s for valleys and upper 80s for Sierra communities, introducing areas of Moderate HeatRisk by Friday at the latest. Have outdoor plans this weekend? Make sure to stay hydrated and plan for activities during the cooler times of the day (before 10am and after 6pm).

-Giralte

AVIATION

VFR conditions for all terminals today. Gusty west/southwest winds up to 35 kts through the afternoon, with brief periods of LLWS between 23Z-06Z. Light showers may impact KTRK/KTVL today, though confidence is low. These showers will bring lower cloud decks, which may introduce mountain obscurations around the Tahoe Basin.

-Giralte

FIRE WEATHER

Two to four hours of elevated to locally critical fire weather conditions are expected this afternoon in areas of dry, finer fuels as west/southwest winds increase. Gusts up to 40 mph will overlap with relative humidities ranging from 10-15% across pockets of Pershing, Churchill, and Lyon counties.

-Giralte

REV Watches/Warnings/Advisories
NV...Lake Wind Advisory until 11 PM PDT this evening NVZ002>004.

CA...Lake Wind Advisory until 11 PM PDT this evening CAZ071-072.