Marine Weather and Tide Forecast for Mono City, CA

DISCUSSION

Several days of triple digit heat begin today and continue into this weekend for lower elevations, while most communities near the Sierra and/or above 6000 feet can expect highs near or above 90 degrees. Little day to day change is expected, although a few sites in west central NV may feel a bit more impact Friday through Saturday when highs near 105 degrees and lows near or above 70 degrees are most likely. These conditions are still within Heat Advisory levels, so be sure to continue all heat safety precautions this week if attending local outdoor events and/or a last hurrah of summer for those gearing up for the new school year. Recent guidance trends are leaning toward keeping similar warmth going through Sunday as well, especially for west central NV.

The prevailing winds each afternoon from today through Saturday become SW-W with typical zephyr-type gusts near 25 mph near and north of I-80. This will have a mixed effect on smoke/haze conditions as we'll see fewer effects from the Pacific NW fires but increasing rounds of smoke from the Gann Fire in central CA.
Farther east across the Basin & Range, less wind will limit dispersion of existing smoke/haze, but also reduce the amount of new smoke reaching this area. Overall, expect the haze to continue across much of the region with varied impacts on air quality through at least Thursday.

While most areas are unlikely to see a break from the dry conditions through the upcoming week, a minor push of increased moisture is projected to spread northward from the southwest US.
The first sign of this moisture return will be afternoon cumulus mainly south of US-50 on Thursday, but warm air aloft and absence of forcing will limit vertical growth. Then for Friday afternoon, a weak upper level disturbance could be sufficient to produce isolated showers/t-storms (10-15% chance) near the eastern Sierra slopes, with a 5-10% chance for a couple of cells popping up in far western NV. The northernmost edge of the moisture then appears to recede a bit after Friday, but daily chances of showers and t-storms (10-20%, except slightly higher on Saturday) are projected for Mono and Mineral counties this weekend into early next week.

The high pressure ridge responsible for this week's heat is still projected to weaken and drift away from western NV next week, resulting in temperatures easing back to near seasonal averages of mid-upper 90s for lower elevations and 80s near the Sierra from Tuesday onward. We could see periods of enhanced afternoon breezes with elevated fire weather concerns during this cooling trend, although confidence remains lower on whether gusts will be of sufficient strength or duration to produce more widespread impacts. MJD

AVIATION

* SW-W wind gusts mainly 20-25 kt prevail at the main terminals each afternoon through at least Friday, generally ramping up between 20-22Z and diminishing by 03-05Z.

* VFR conditions continue this week. However, smoke and haze from area fires will impact slantwise visibility at times around the main terminals, except for thinner haze at KMMH. Prolonged daytime heat will result in density altitude concerns into this weekend. MJD

REV Watches/Warnings/Advisories
NV...Heat Advisory until 8 AM PDT Sunday NVZ001-003>005.

CA...Heat Advisory until 8 AM PDT Sunday CAZ070-071.