textproduct: Reno

KEY MESSAGES

* A prolonged period of triple-digit heat across western NV and eastern CA valleys will bring us into the weekend.

* Smoke and haze from regional wildfires could bring periods of reduced air quality at times through this week, although should be lighter the next couple days.

* Dry conditions persist in most areas, but low-end isolated afternoon shower and thunder chances may return Friday through early next week for parts of the eastern Sierra and western NV.

DISCUSSION

These afternoons will be hot, so make sure to limit strenuous activities to the early morning or late evening hours, limiting exposure time during the hottest hours of the day. If your plans bring you out into the 100+ degree heat, make sure to take frequent breaks in shade and/or air conditioning and keep hydrated. The much advertised heating trend is here to stay with us through early next week, and for locations across western Nevada, widespread Moderate to Major HeatRisk along with isolated pockets of Extreme HeatRisk emerge for Friday morning through Monday morning. This has prompted the issuance of an Extreme Heat Warning over the weekend for the Basin and Range of western Nevada. Elsewhere, Heat Advisories stand through Monday morning to accommodate for the hot daytime readings and lack of appreciable overnight cooling during this prolonged period.

Winds will reside in the typical summertime zephyr regime of behaviors, with westerly afternoon gusts of up to 25 mph are possible each day. The smoke we have recently seen on the horizon has been shown by guidance to become lighter over the next couple days, but smoke forecasting can be tricky because it is not only dependent on winds, but also fire behaviors. Given the wind direction of mostly W-SW, the location and recent fire behavior of the Gann Fire, we cannot rule out periods of hazy skies until the fire is under containment.

We will also start to see the influence from a reestablished monsoonal moisture tap starting today with cumulus buildups and even a 5% chance for showers in southern Mono and Mineral counties. Similar chances are slated for the same areas for Friday. Chances increase to 20-30% for Saturday over the same area. Then, Sunday chances nudge even higher to 30-35% for that favored Mono/Mineral area. We cannot rule out a shower creeping north of US-50 for Saturday onward. These shower chances will stick around into at least mid week next week. HRICH

AVIATION

* W-SW gusts of 20-25 kts today between 21z-03z will be the main concern under VFR conditions. Other concerns will be limited slantwise visibility due to regional smoke from area fires, as well as density altitude concerns due to hot daytime temperatures. HRICH

REV Watches/Warnings/Advisories

NV...Heat Advisory until 8 AM PDT Monday NVZ001-003-005.

Heat Advisory until 8 AM PDT Friday NVZ004.

Extreme Heat Warning from 8 AM Friday to 8 AM PDT Monday NVZ004.

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