957
FXUS65 KREV 182141
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
141 PM PST SUN JAN 18 2026
KEY MESSAGES
* LIGHT WINDS AND VALLEY INVERSIONS WILL KEEP HAZY SKIES AND AIR
QUALITY REDUCTIONS THROUGH THE REMAINDER OF THE HOLIDAY WEEKEND
WITH PATCHY FREEZING FOG IN SOME SIERRA VALLEYS.
* DRY WEATHER PREVAILS GOING INTO THIS WEEK WITH ABOVE AVERAGE
DAYTIME TEMPERATURES AND NEAR AVERAGE LOW TEMPERATURES.
* A PATTERN CHANGE IS POSSIBLE FOR THE LATTER HALF OF THE WEEK
ALLOWING GUSTY MOUNTAIN RIDGE WINDS TO RETURN. BUT, CONFIDENCE
IS LOW.
DISCUSSION
* CURRENT RADAR IMAGERY IS PICKING UP SOME LIGHT SIGNATURES THIS
MORNING/EARLY AFTERNOON IN ALPINE, NORTHERN MONO, AND MINERAL
COUNTIES. BUT, LOOKING AT LOCAL CAMERA NETWORKS AND JUDGING BY
THE MORNING SOUNDING, NOT MUCH OF THIS IS HITTING THE GROUND.
THE ONLY WEATHER FEATURE THAT IS PERSISTENT IS LOW STRATUS AND
FREEZING FOG IN MONO LAKE, WHICH WILL CONTINUE ON MONDAY. WE'LL
ALSO KEEP THE MORNING FREEZING FOG IN MARTIS VALLEY AND AROUND
LAKE CROWLEY. THE DRY, BENIGN PATTERN WITH PERSISTENT STRONG
INVERSIONS WILL CONTINUE THROUGH MID-WEEK.
* BY LATE WEDNESDAY NIGHT INTO THURSDAY MORNING AN UPPER LEVEL
TROUGH MOVES INTO THE REGION, BREAKING DOWN THE PERSISTENT RIDGE
THAT HAS BEEN OVER THE AREA FOR THE LAST FEW WEEKS. SOME MODELS
AND ENSEMBLES ARE HINTING AT A CUT OFF LOW MOVING ONSHORE EITHER
IN CENTRAL CA OR SOUTHERN CA BY THURSDAY INTO FRIDAY. DEPENDING
ON LOCATION OF THE CUTOFF LOW (IF IT EVENS FORMS) WE ARE OPEN TO
A POSSIBLE (~10-15%) CHANCE FOR WRAP AROUND PRECIPITATION IN
MONO COUNTY THURSDAY AFTERNOON AND EVENING. CONFIDENCE IN THIS
CUT OFF LOW FEATURE IS LOW AT THE MOMENT. BY FRIDAY NIGHT INTO
NEXT WEEKEND, THE MODEL ENSEMBLES ONCE AGAIN REINTRODUCE A RIDGE
INTO THE WESTERN US. HIGH TEMPERATURES THIS UPCOMING WEEK ARE
5-10 DEGREES ABOVE AVERAGE WITH NEAR AVERAGE LOW TEMPERATURES.
WITH THE PASSAGE OF THE UPPER LEVEL TROUGH, WINDS MAY START TO
PICKUP ON FRIDAY. THIS WILL HOPEFULLY END THE INVERSIONS THAT
ARE KEEPING THE AIR QUALITY GROSS. -MCKELLAR
AVIATION
VFR CONDITIONS AND LIGHT SURFACE WINDS PERSIST FOR AREA TAF SITES
GOING THROUGH THE HOLIDAY WEEKEND. THE ONLY EXCEPTION IS AT KTRK
WHERE PATCHY AND MAINLY SHALLOW FZFG IS EXPECTED THROUGH AROUND
15Z MONDAY. HAZE IN W.NV MAY LEAD TO REDUCED SLANTWISE VISIBILITIES.
AREA CLOUD COVER THIS AFTERNOON WILL DIMINISH TONIGHT. -MCKELLAR
REV WATCHES/WARNINGS/ADVISORIES
NV...NONE.
CA...NONE.
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