880
FXUS65 KREV 260808
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
108 AM PDT SAT SEP 26 2026
KEY MESSAGES
* A SYSTEM WILL BRING COOLER TEMPERATURES WITH HIGHS DROPPING
BETWEEN 5 TO 10 DEGREES BELOW AVERAGE BY SUNDAY AND MONDAY.
* 20-50% CHANCE FOR RAIN AND LIGHT HIGH ELEVATION SNOW SHOWERS
(>9,000') ACROSS THE EASTERN SIERRA AND WESTERN NEVADA SUNDAY
NIGHT INTO MONDAY AFTERNOON.
* RIDGE RETURNS TO THE AREA TUESDAY, LEADING TO A WARMING AND
DRYING TREND THROUGH NEXT WEEKEND.
DISCUSSION
THE SYSTEM THAT PRODUCED STRONG WINDS ACROSS THE REGION ON FRIDAY
HAS MOVED INTO THE NORTHERN ROCKIES. WE ARE UNDER A NEAR-ZONAL
FLOW ALOFT TODAY WITH CALM CONDITIONS AND NORMAL TEMPERATURES FOR
THE LAST WEEK OF SEPTEMBER. WINDS WILL REMAIN A BIT BREEZY THIS
AFTERNOON, WITH GUSTS BETWEEN 20-25 MPH FOR MOST LOCATIONS AND
40-45 MPH FOR THE SIERRA RIDGES.
BY SUNDAY AND MONDAY, ANOTHER LOW PRESSURE SYSTEM WILL MOVE INTO
THE REGION. THE FIRST IMPACT FROM THIS SYSTEM WILL BE A 20-50%
CHANCE FOR PRECIPITATION FOR MUCH OF WESTERN NV STARTING LATE
SUNDAY INTO LATE MONDAY. PRECIPITATION AMOUNTS IN WESTERN NV ARE
LIGHT, WITH A 15-30% CHANCE FOR AT LEAST 0.10" OF RAIN.
THE EASTERN SIERRA WILL ALSO HAVE A 20-50% CHANCE FOR
PRECIPITATION DURING THIS TIMEFRAME, MOSTLY IMPACTING THE TAHOE
BASIN SOUTHWARD INTO MONO COUNTY. SNOW LEVELS WITH THIS SYSTEM
WILL DROP TO BETWEEN 8,500-9,000 FEET, WHERE THERE STILL IS A LOW
10-20% CHANCE FOR AT LEAST 1" OF SNOW ABOVE 9,500 FEET IN MONO
COUNTY. OVERALL PRECIPITATION AMOUNTS ARE ALSO LIGHT, WITH A
30-50% CHANCE FOR AT LEAST 0.10" OF LIQUID.
TEMPERATURES FOR SUNDAY AND MONDAY WILL BE ON THE COOL SIDE, WITH
HIGHS AROUND 5-10 DEGREES BELOW AVERAGE BY MONDAY WITH HIGHS IN
THE LOW 70S ACROSS WESTERN NV WITH MID-60S FOR SIERRA VALLEYS.
ALSO, SIERRA VALLEYS ON MONDAY AND TUESDAY MORNING HAVE LIKELY
CHANCES FOR BELOW FREEZING TEMPERATURES.
LONG TERM ENSEMBLES SHOW HIGH PRESSURE RETURNING TO THE REGION
TUESDAY ONWARD. THIS WILL LEAD TO A WARMING TREND, WITH ABOVE
NORMAL TEMPERATURES BY WEDNESDAY INTO NEXT WEEKEND. WE LOOK DRY
DURING THIS TIMEFRAME. -MCKELLAR
AVIATION
SURFACE WINDS FROM THE SW AROUND 10-15KTS WITH GUSTS OF 20-25KTS
ARE EXPECTED AT ALL AREA TERMINALS THIS AFTERNOON AND EVENING.
FL100 WINDS REMAIN ELEVATED AROUND 30-35KTS FROM THE SW THROUGH
THE MORNING, RESULTING IN INCREASED MOUNTAIN WAVE TURBULENCE AND
LLWS. OTHERWISE, VFR CONDITIONS PREVAIL. -MCKELLAR
REV WATCHES/WARNINGS/ADVISORIES
NV...NONE.
CA...NONE.
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