167
FXUS65 KREV 100758
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
1258 AM PDT THU JUL 10 2025
KEY MESSAGES
* PROLONGED HEAT WAVE BEGINS FRIDAY WITH HIGHS REACHING 100-107
DEGREES IN WESTERN NEVADA VALLEYS AND 85-93 DEGREES IN THE SIERRA.
* LITTLE OVERNIGHT RELIEF EXPECTED, ESPECIALLY IN URBAN AREAS,
INCREASING HEAT-RELATED ILLNESS RISK.
* SMOKE AND HAZE FROM WILDFIRES IN NORTHERN CA AND SOUTHERN OR MAY
IMPACT AIR QUALITY AND VISIBILITY INTO THE WEEKEND.
DISCUSSION
A ROBUST AND PERSISTENT UPPER-LEVEL RIDGE WILL EXPAND ACROSS THE
GREAT BASIN AND DESERT SOUTHWEST BEGINNING FRIDAY, RESULTING IN
STRONG SUBSIDENCE, CLEAR SKIES, AND A PROLONGED PERIOD OF WELL ABOVE-
NORMAL TEMPERATURES. LOWER VALLEYS OF WESTERN NEVADA - INCLUDING
FALLON, LOVELOCK, AND HAWTHORNE - ARE EXPECTED TO REACH PEAK
AFTERNOON HIGHS OF 105-107 DEGREES, WHILE RENO AND CARSON CITY ARE
FORECAST TO REACH 100-104 DEGREES SUNDAY AND MONDAY. NBM
PROBABILITIES INDICATE A 75% CHANCE OF RENO REACHING OR EXCEEDING
103 DEGREES ON SUNDAY, AND A 45% CHANCE OF HITTING OR SURPASSING 105
DEGREES ON MONDAY, WHICH WOULD TIE OR BREAK THE RESPECTIVE DAILY
RECORDS. IN TANDEM, OVERNIGHT LOWS WILL REMAIN ELEVATED -
PARTICULARLY IN URBANIZED AREAS - HOLDING IN THE UPPER 60S TO LOW
70S, WHICH WILL LIMIT NOCTURNAL RECOVERY AND INCREASE THE RISK FOR
CUMULATIVE HEAT STRESS.
LOWER VALLEYS OF WESTERN NEVADA - INCLUDING FALLON, LOVELOCK,
HAWTHORNE, AND THE RENO-CARSON CORRIDOR - WILL FACE THE MOST
SIGNIFICANT HEAT IMPACTS AS HIGHS CLIMB TO 100-107 DEGREES THROUGH
EARLY NEXT WEEK. PROLONGED EXPOSURE TO THIS LEVEL OF HEAT,
COMPOUNDED BY POOR OVERNIGHT RECOVERY (LOWS IN THE UPPER 60S TO LOW
70S), RAISES THE RISK FOR HEAT-RELATED ILLNESSES - PARTICULARLY FOR
OUTDOOR WORKERS, VULNERABLE POPULATIONS, AND THOSE WITHOUT ADEQUATE
COOLING. HEATRISK INDICATES WIDESPREAD MAJOR CATEGORY IMPACTS ACROSS
THE LOWER VALLEYS, WITH MODERATE RISK EXTENDING INTO FOOTHILL AND
BASIN TERRAIN. MEANWHILE, SIERRA COMMUNITIES WILL REMAIN WARM,
WITH HIGHS IN THE UPPER 80S TO LOW 90S AND MODERATE HEAT RISKS FOR
RECREATIONISTS AND CAMPERS.
WILDFIRE SMOKE FROM ONGOING ACTIVITY IN NORTHERN CALIFORNIA AND
SOUTHERN OREGON MAY ADVECT INTO PORTIONS OF NORTHEAST CALIFORNIA AND
NORTHWEST NEVADA OVER THE COMING DAYS, POTENTIALLY DEGRADING AIR
QUALITY AND REDUCING VISIBILITY. HRRR SMOKE OUTPUT INDICATES
PERIODIC HAZE AND SURFACE SMOKE NEAR THE CA/OR BORDER, MAINLY
DURING OVERNIGHT AND MORNING HOURS. AFTERNOON ZEPHYR WINDS WILL
PERSIST, WITH GUSTS OF 20-25 MPH ALONG THE SIERRA FRONT. A LOW-END
(5-10%) CHANCE OF AFTERNOON CONVECTION MAY RETURN TO THE EASTERN
SIERRA NEXT TUESDAY THROUGH FRIDAY AS MID-LEVEL MOISTURE GRADUALLY
INCREASES.
-JOHNSTON
AVIATION
VFR CONDITIONS WILL PREVAIL, BUT AREAS OF HAZE OR SMOKE MAY AFFECT
FAR NORTHWEST NEVADA AND NORTHEAST CALIFORNIA, ESPECIALLY NEAR THE
CA/OR BORDER.
SOUTHWEST WINDS GUSTING 20-25 KT EACH AFTERNOON MAY CAUSE MECHANICAL
TURBULENCE NEAR RIDGES.
DENSITY ALTITUDE CONDITIONS WILL BECOME INCREASINGLY HAZARDOUS
SUNDAY THROUGH TUESDAY DUE TO ELEVATED TEMPERATURES AND HIGH FIELD
ELEVATIONS. EXPECT REDUCED AIRCRAFT PERFORMANCE DURING PEAK HEAT,
PARTICULARLY FOR HIGH-ELEVATION TAKEOFFS AND LANDINGS.
-JOHNSTON
REV WATCHES/WARNINGS/ADVISORIES
NV...NONE.
CA...NONE.
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