161
FXUS65 KREV 022037
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
137 PM PDT SUN AUG 2 2026
KEY MESSAGES
* AFTER A BRIEF DIP IN TEMPERATURES THROUGH MONDAY, TRIPLE DIGIT
HEAT IN WESTERN NV VALLEYS RETURNS FOR THE REST OF THIS WEEK.
* BREEZY WINDS THROUGH THIS EVENING WILL PRODUCE SHORT PERIODS OF
ELEVATED FIRE WEATHER CONCERNS FROM NORTHEAST CA TO PARTS OF
WESTERN NV MAINLY FROM I-80 NORTHWARD.
* CURRENT ACTIVE FIRES PRODUCING AREAS OF HAZE AND SMOKE COULD
REDUCE AIR QUALITY IN PARTS OF WESTERN NV AND NORTHEAST CA LATE
TONIGHT THROUGH AT LEAST TUESDAY.
DISCUSSION
TODAY AND MONDAY BRING A TEMPORARY DIP IN TEMPERATURES FOR LOWER
ELEVATIONS BEHIND A TROUGH PASSAGE ALONG THE NORTHWEST US-CANADA
BORDER. THE OTHER EFFECT OF THIS TROUGH TODAY WILL BE AFTERNOON-
EVENING WIND GUSTS EDGING UP TO 25-30 MPH WITH A FEW GUSTS TO 35
MPH FOR AREAS NEAR AND NORTH OF I-80. THIS WOULD LEAD TO ELEVATED
FIRE WEATHER CONCERNS AS AFTERNOON HUMIDITY BOTTOMS OUT IN THE
SINGLE DIGITS FOR WESTERN NV AND PARTS OF EASTERN LASSEN COUNTY
AND 10-15% FOR AREAS NORTH OF SUSANVILLE-GERLACH TO THE OR BORDER.
WHILE HIGHS MONDAY DROP CLOSER TO EARLY AUGUST AVERAGES IN THE
MID-UPPER 90S FOR MOST VALLEY AREAS (BUT REMAIN NEAR 90 FOR SIERRA
COMMUNITIES), ONE TRADE-OFF RESULTING FROM A NORTHERLY LOW-MID
LEVEL FLOW WILL BE INCREASED AREAS OF HAZE AND SMOKE CARRIED IN
FROM LARGE ACTIVE FIRES ACROSS OREGON. AT A MINIMUM, EXPECT HAZY
SKIES TO ADVANCE INTO MORE AREAS OF WESTERN NV AND NORTHEAST CA
FROM LATE TONIGHT THROUGH TUESDAY. WHILE THE AMOUNT OF SMOKE
SETTLING TO THE SURFACE IMPACTING AIR QUALITY IS LESS OF A
CERTAINTY, IT WOULD BE A GOOD IDEA TO CLOSE WINDOWS LATER THIS
EVENING AND CHECK AIRNOW.GOV FOR THE LATEST AIR QUALITY
INFORMATION DURING THE NEXT FEW DAYS.
FROM TUESDAY THROUGH NEXT WEEKEND, TRIPLE DIGIT HEAT RETURNS TO
MOST WESTERN NV VALLEYS WITH PROLONGED PEAK HEAT (TEMPERATURES
SIMILAR TO YESTERDAY) FROM WEDNESDAY-SATURDAY AS HIGH PRESSURE
EXPANDS NORTHWARD FROM THE SOUTHWEST US. OVERNIGHT LOWS ARE ALSO
POISED TO TREND UPWARD LATER IN THE WEEK WITH HEATRISK RISING TO
THE MAJOR CATEGORY IN MORE AREAS, SO HAVING A PLAN TO STAY SAFE
(ESPECIALLY FOR THOSE MORE SENSITIVE TO HEAT) DURING THIS LONGER
HEAT PERIOD BECOMES MORE IMPORTANT.
THE CONTINUED DRY AIR MASS WITH WARM AIR ALOFT CONTINUES TO KEEP
CONDITIONS UNFAVORABLE FOR RAIN OR T-STORMS, ALTHOUGH LATER THIS
WEEK AFTERNOON CUMULUS BUILDUPS ARE PROJECTED TO RETURN FOR AREAS
SOUTH OF US-50. FOR NEXT WEEKEND, PM SHOWER/THUNDER CHANCES EDGE
UPWARD TO NEAR 10-15% FOR SOUTHERN PORTIONS OF MONO AND MINERAL
COUNTIES.
LONGER RANGE OUTLOOKS STILL ATTEMPT TO SPREAD THE OUTER FRINGES
OF A MONSOONAL MOISTURE PUSH INTO PARTS OF THE EASTERN SIERRA AND
WESTERN NV, BUT ALSO HINT AT ADDITIONAL LOW PRESSURE/TROUGH
ACTIVITY AFFECTING THE PACIFIC NW. THIS WOULD GENERALLY FAVOR
SHOWER AND T-STORM POTENTIAL FOR MONO-MINERAL-CHURCHILL COUNTIES
WITH DECREASING CHANCES FOR AREAS FARTHER NORTH AND WEST, WHERE
WINDS MAY INCREASE. IN ADDITION, THIS PATTERN WOULD DISPLACE THE
HIGH PRESSURE RIDGE AWAY FROM CA/NV, WITH THE MAJORITY OF EXTENDED
RANGE GUIDANCE BACKING OFF FROM TRIPLE DIGIT HEAT DURING THE WEEK
OF AUGUST 10. MJD
AVIATION
WIDESPREAD VFR CONDITIONS PREVAIL TODAY WITH W/SW OF 20-25 KTS IN
THE AFTERNOON. A WEAK FRONTAL PASSAGE WILL DELIVER SMOKE FROM OR
WILDFIRES TO AREAS NEAR AND NORTH OF RENO/TAHOE MONDAY MORNING,
WHICH MAY RESULT IN REDUCTIONS TO SLANTWISE VISIBILITIES TO KRNO-
KCXP-KMEV MONDAY INTO TUESDAY.
-SALAS
REV WATCHES/WARNINGS/ADVISORIES
NV...NONE.
CA...NONE.
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