textproduct: Reno

KEY MESSAGES

* A minor dip in temperatures today will precede a prolonged period of triple-digit heat across western Nevada valleys and eastern California basins through next weekend.

* Smoke and haze from regional wildfires will continue to impact air quality, particularly across northeastern California and northwestern Nevada.

* Dry conditions will persist this week, with low-end precipitation chances starting to pop up this weekend.

DISCUSSION

Early this week, we have a pronounced upper-level ridge anchored over the Desert Southwest with a weak shortwave trough passing to our north across the Pacific Northwest. This pattern will maintain hot and dry conditions across the region. Smoke and haze from ongoing regional wildfires will continue to be a factor, leading to periods of reduced air quality across the region. Visibility may be impacted, especially in northeastern California and northwestern Nevada.

For today, a minor reduction in high temperatures is expected compared to recent days, with western Nevada valleys and eastern California basins generally seeing highs in the upper 90s, though some isolated locations may still reach near 100F. Sierra communities will remain hot, with highs in the upper 80s to low 90s. Overnight lows will provide limited relief, generally ranging from the upper 50s in the Sierra to upper 60s/low 70s in the valleys.

By Tuesday and Wednesday, the heat will rapidly intensify as the upper ridge strengthens and shifts slightly eastward. Western Nevada valleys and eastern California basins will see widespread triple- digit temperatures return, with highs climbing into the 100-105F range. Sierra communities will also experience a warm-up as well, with highs reaching the low to mid 90s. Overnight lows will remain uncomfortably warm, generally in the 60s to low 70s for the valleys, and 50s to low 60s for the Sierra. This prolonged heat has necessitated a Heat Advisory for Wednesday, followed by an Extreme Heat Watch from Thursday morning through Sunday morning for much of western Nevada and eastern California.

High temperatures across lower valleys will remain at or above triple digits through this weekend with highs generally 100-105F. Sierra communities will see highs consistently in the low to mid 90s. Monsoonal moisture is expected to return to parts of the Southwest US this weekend. NBM guidance shows very low PoPs (5-15%) primarily for Mono and Mineral counties this weekend.

-Justin

AVIATION

* VFR conditions with westerly gusts of 15 kts in the Sierra and NW-NE gusts across NE CA and W NV this afternoon. Smoke and haze from nearby fires may bring periods of reduced slantwise visibility to area terminals through Tuesday. HRICH/Justin

REV Watches/Warnings/Advisories

NV...Heat Advisory from 8 AM Wednesday to 8 AM PDT Thursday NVZ001- 003>005.

Extreme Heat Watch from Thursday morning through Sunday morning NVZ001-003>005.

CA...Heat Advisory from 8 AM Wednesday to 8 AM PDT Thursday CAZ070- 071.

Extreme Heat Watch from Thursday morning through Sunday morning CAZ070-071.