303
FXUS65 KREV 202043
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
1243 PM PST TUE JAN 20 2026
KEY MESSAGES
* LIGHT WINDS AND VALLEY INVERSIONS THROUGH THURSDAY MORNING WILL
MAINTAIN HAZY SKIES AND AIR QUALITY REDUCTIONS FOR ALL VALLEY
AREAS WITH PATCHY FREEZING FOG IN SOME SIERRA VALLEYS.
* A PASSING WAVE THURSDAY MAY BRING GUSTY MOUNTAIN RIDGE WINDS AND
LOW CHANCES FOR SHOWERS TO THE SIERRA AND PORTIONS OF WESTERN
NEVADA LATE WEEK.
DISCUSSION
MAIN STORY THIS WEEK CONTINUES TO BE HIGH PRESSURE WITH LIGHT WINDS,
DRY CONDITIONS, AND STABLE AIR WHICH IS CONTRIBUTING TO STRONG
VALLEY INVERSIONS. WITH THE STRONG INVERSIONS IN PLACE, WE CAN PLAN
ON HAZY SKIES AND REDUCTIONS IN AIR QUALITY THROUGH AT LEAST
THURSDAY MORNING. PORTIONS OF MONO COUNTY, PARTICULARLY LEE VINING
AND MONO LAKE, WILL CONTINUE TO DEAL WITH THE VERY PERSISTENT
FREEZING FOG CONDITIONS. WE RECOMMEND KEEPING AN EYE ON AIRNOW.GOV
UNTIL THE INVERSIONS AND STAGNANT AIR BREAK UP.
ALTHOUGH THERE IS A SHRED OF LIGHT AT THE END OF THE STAGNANT
WEATHER TUNNEL, THERE ARE STILL SOME DISCREPANCIES IN THE SOLUTIONS.
WE ARE KEEPING AN EYE ON A CUT-OFF LOW PROJECTED TO DRAG SOUTHWARD
ALONG THE WEST COAST WITH THE POTENTIAL FOR INCREASED RIDGE WINDS
AND SHOWER CHANCES. THERE IS A 20-30% CHANCE OF SOME SNOW SHOWERS
EARLY THURSDAY INTO FRIDAY FOR AREAS TAHOE SOUTHWARD INTO THE
EASTERN SIERRA. THE AMOUNTS WILL DEPEND ON HOW THE CUT-OFF LOW
TRACKS DOWN CA, BUT FOR NOW IT LOOKS LIKE THERE COULD BE VERY LIGHT
ACCUMULATIONS IN THE HIGHER ELEVATIONS (AN INCH OR LESS). GUSTY
RIDGE WINDS WILL TRANSITION FROM WEST TO EAST FRIDAY INTO SATURDAY
WITH GUSTS 20 TO 30 MPH AT TIMES. OTHERWISE, THERE ISN'T MUCH IN THE
WAY OF MEANINGFUL PRECIPITATION THROUGH THE END OF THE WEEK.
-EDAN
AVIATION
VFR CONDITIONS AND LIGHT SURFACE WINDS PERSIST FOR SIERRA AND
WESTERN NEVADA TAF SITES THROUGH EARLY THURSDAY. THE ONLY EXCEPTION
IS AT KTRK WHERE PATCHY AND MAINLY SHALLOW FZFG IS EXPECTED TO RENEW
TONIGHT INTO TOMORROW MORNING (UNTIL ABOUT 15-16Z). STRONG SURFACE
INVERSIONS AND LIGHT WINDS WILL ALLOW FOR HAZE IN W.NV TO REDUCED
SLANTWISE VISIBILITIES THROUGH EARLY THURSDAY MORNING.
-EDAN
REV WATCHES/WARNINGS/ADVISORIES
NV...NONE.
CA...NONE.
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