231
FXUS65 KREV 101858
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
1158 AM PDT Sun Aug 10 2025

.KEY MESSAGES...

* Heat Advisory in effect Monday-Wednesday for western Nevada
  valleys and portions of northeast California, with highs 95-105
  degrees and Moderate to locally Major HeatRisk.

* Light haze into Monday morning for Mono County, with any
  localized smoke most likely near Mammoth Lakes if fire activity
  increases.

* Isolated thunderstorms possible midweek, followed by increasing
  winds Wednesday-Thursday that may bring localized elevated fire
  weather concerns and cooler temperatures late week.

&&

.DISCUSSION...

Heat through Wednesday AM:

* A strengthening subtropical ridge shifts inland to start the week,
  driving a significant warm-up and prompting a Heat Advisory Monday
  through Wednesday for western Nevada valleys and parts of
  northeast California. Highs will peak between 98-105 degrees in
  western Nevada, with the hottest day for most areas on Tuesday.
  Sierra valleys will reach the mid to upper 80s, with some lower
  90s possible for warmer locations like Bridgeport and Mammoth
  Lakes. Overnight lows in western Nevada will remain in the upper
  60s to low 70s, limiting relief and increasing heat stress for
  sensitive groups, outdoor workers, and those without adequate
  cooling.

Showers/Thunderstorms and Increasing Winds Mid to Late Week:

* As the ridge axis slides east Tuesday into Wednesday, modest
  moisture will lift north along the Sierra crest, bringing a chance
  for isolated, high-based thunderstorms mainly for Mono and Alpine
  counties and possibly into far western Nevada Wednesday. These
  storms could produce gusty, erratic outflow winds, brief
  downpours, and occasional lightning. By Wednesday afternoon, a
  Pacific Northwest trough will tighten the pressure gradient, with
  a 60-75% probability of wind gusts over 35 mph in lower western
  Nevada and a 40-50% probability in Sierra valleys. Ridge gusts may
  exceed 40 mph. Minimum RH will fall into the single digits to low
  teens for lower valleys, supporting localized elevated fire
  weather concerns in far northern Washoe, northern Pershing, and
  parts of Lassen County. Temperatures will cool 5-10 degrees by
  Thursday-Friday, returning closer to seasonal normals.

-Johnston

&&

.AVIATION...

* VFR conditions will prevail through the next 24 hours. Light haze
  is possible late tonight into Monday morning for KMMH, KMEV, and
  KBAN, with some slant-range visibility reductions in the morning
  hours before improving by late morning with mixing. Surface winds
  will remain SW-W 5-10 kts today with afternoon gusts 15-20 kts,
  increasing slightly Monday afternoon from the W-NW at 15-20 kts.
  Hot temperatures through midweek will create elevated density
  altitude concerns at all regional airports, especially in the
  Sierra and higher-elevation terminals.

* Looking beyond 24 hours, isolated high-based thunderstorms are
  possible Tuesday and Wednesday afternoon mainly along the Sierra
  crest, with outflow gusts exceeding 35 kts possible near any
  cells. By Wednesday, a stronger westerly gradient will bring more
  widespread surface gusts of 25-35 kts across lower western Nevada
  terminals. This will result in periods of turbulence and possible
  LLWS.

-Johnston

&&

.REV Watches/Warnings/Advisories...
NV...Heat Advisory from 11 AM Monday to 9 AM PDT Wednesday NVZ001-
     003>005.

CA...Heat Advisory from 11 AM Monday to 9 AM PDT Wednesday CAZ070-071.

&&

$$