508
FXUS65 KREV 051919
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
1219 PM PDT WED AUG 5 2026
KEY MESSAGES
* A PROLONGED PERIOD OF TRIPLE-DIGIT HEAT ACROSS WESTERN NV AND
EASTERN CA VALLEYS WILL CONTINUE INTO THIS WEEKEND.
* SMOKE AND HAZE FROM REGIONAL WILDFIRES COULD BRING PERIODS OF
REDUCED AIR QUALITY AT TIMES THROUGH THIS WEEK.
* 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
SEVERAL DAYS OF TRIPLE DIGIT HEAT BEGIN TODAY AND CONTINUE INTO
THIS WEEKEND FOR LOWER ELEVATIONS, WHILE MOST COMMUNITIES NEAR
THE SIERRA AND/OR ABOVE 6000 FEET CAN EXPECT HIGHS NEAR OR ABOVE
90 DEGREES. LITTLE DAY TO DAY CHANGE IS EXPECTED, ALTHOUGH A FEW
SITES IN WEST CENTRAL NV MAY FEEL A BIT MORE IMPACT FRIDAY THROUGH
SATURDAY WHEN HIGHS NEAR 105 DEGREES AND LOWS NEAR OR ABOVE 70
DEGREES ARE MOST LIKELY. THESE CONDITIONS ARE STILL WITHIN HEAT
ADVISORY LEVELS, SO BE SURE TO CONTINUE ALL HEAT SAFETY
PRECAUTIONS THIS WEEK IF ATTENDING LOCAL OUTDOOR EVENTS AND/OR A
LAST HURRAH OF SUMMER FOR THOSE GEARING UP FOR THE NEW SCHOOL
YEAR. RECENT GUIDANCE TRENDS ARE LEANING TOWARD KEEPING SIMILAR
WARMTH GOING THROUGH SUNDAY AS WELL, ESPECIALLY FOR WEST CENTRAL
NV.
THE PREVAILING WINDS EACH AFTERNOON FROM TODAY THROUGH SATURDAY
BECOME SW-W WITH TYPICAL ZEPHYR-TYPE GUSTS NEAR 25 MPH NEAR AND
NORTH OF I-80. THIS WILL HAVE A MIXED EFFECT ON SMOKE/HAZE
CONDITIONS AS WE'LL SEE FEWER EFFECTS FROM THE PACIFIC NW FIRES
BUT INCREASING ROUNDS OF SMOKE FROM THE GANN FIRE IN CENTRAL CA.
FARTHER EAST ACROSS THE BASIN & RANGE, LESS WIND WILL LIMIT
DISPERSION OF EXISTING SMOKE/HAZE, BUT ALSO REDUCE THE AMOUNT OF
NEW SMOKE REACHING THIS AREA. OVERALL, EXPECT THE HAZE TO CONTINUE
ACROSS MUCH OF THE REGION WITH VARIED IMPACTS ON AIR QUALITY
THROUGH AT LEAST THURSDAY.
WHILE MOST AREAS ARE UNLIKELY TO SEE A BREAK FROM THE DRY
CONDITIONS THROUGH THE UPCOMING WEEK, A MINOR PUSH OF INCREASED
MOISTURE IS PROJECTED TO SPREAD NORTHWARD FROM THE SOUTHWEST US.
THE FIRST SIGN OF THIS MOISTURE RETURN WILL BE AFTERNOON CUMULUS
MAINLY SOUTH OF US-50 ON THURSDAY, BUT WARM AIR ALOFT AND ABSENCE
OF FORCING WILL LIMIT VERTICAL GROWTH. THEN FOR FRIDAY AFTERNOON,
A WEAK UPPER LEVEL DISTURBANCE COULD BE SUFFICIENT TO PRODUCE
ISOLATED SHOWERS/T-STORMS (10-15% CHANCE) NEAR THE EASTERN SIERRA
SLOPES, WITH A 5-10% CHANCE FOR A COUPLE OF CELLS POPPING UP IN
FAR WESTERN NV. THE NORTHERNMOST EDGE OF THE MOISTURE THEN APPEARS
TO RECEDE A BIT AFTER FRIDAY, BUT DAILY CHANCES OF SHOWERS AND
T-STORMS (10-20%, EXCEPT SLIGHTLY HIGHER ON SATURDAY) ARE
PROJECTED FOR MONO AND MINERAL COUNTIES THIS WEEKEND INTO EARLY
NEXT WEEK.
THE HIGH PRESSURE RIDGE RESPONSIBLE FOR THIS WEEK'S HEAT IS STILL
PROJECTED TO WEAKEN AND DRIFT AWAY FROM WESTERN NV NEXT WEEK,
RESULTING IN TEMPERATURES EASING BACK TO NEAR SEASONAL AVERAGES OF
MID-UPPER 90S FOR LOWER ELEVATIONS AND 80S NEAR THE SIERRA FROM
TUESDAY ONWARD. WE COULD SEE PERIODS OF ENHANCED AFTERNOON BREEZES
WITH ELEVATED FIRE WEATHER CONCERNS DURING THIS COOLING TREND,
ALTHOUGH CONFIDENCE REMAINS LOWER ON WHETHER GUSTS WILL BE OF
SUFFICIENT STRENGTH OR DURATION TO PRODUCE MORE WIDESPREAD
IMPACTS. MJD
AVIATION
* SW-W WIND GUSTS MAINLY 20-25 KT PREVAIL AT THE MAIN TERMINALS
EACH AFTERNOON THROUGH AT LEAST FRIDAY, GENERALLY RAMPING UP
BETWEEN 20-22Z AND DIMINISHING BY 03-05Z.
* VFR CONDITIONS CONTINUE THIS WEEK. HOWEVER, SMOKE AND HAZE FROM
AREA FIRES WILL IMPACT SLANTWISE VISIBILITY AT TIMES AROUND THE
MAIN TERMINALS, EXCEPT FOR THINNER HAZE AT KMMH. PROLONGED
DAYTIME HEAT WILL RESULT IN DENSITY ALTITUDE CONCERNS INTO THIS
WEEKEND. MJD
REV WATCHES/WARNINGS/ADVISORIES
NV...HEAT ADVISORY UNTIL 8 AM PDT SUNDAY NVZ001-003>005.
CA...HEAT ADVISORY UNTIL 8 AM PDT SUNDAY CAZ070-071.
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