666
FXUS65 KREV 031900
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
1200 PM PDT MON AUG 3 2026
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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page