091
FXUS65 KREV 120945
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
145 AM PST MON JAN 12 2026
KEY MESSAGES
* DRY WEATHER PREVAILS THIS WEEK WITH NEAR AVERAGE DAYTIME
TEMPERATURES WARMING TO ABOVE AVERAGE FROM MIDWEEK ONWARD.
* LIGHT WINDS AND VALLEY INVERSIONS WILL CREATE HAZY SKIES AND
AIR QUALITY REDUCTIONS THIS WEEK.
* SIERRA RIDGES CAN EXPECT PERIODS OF GUSTY EAST WINDS THIS WEEK,
WITH THE BEST CHANCES THROUGH TONIGHT AND AGAIN BY LATE
THURSDAY.
DISCUSSION
OUR DRY WEATHER PATTERN WILL PERSIST FOR THE UPCOMING WEEK WITH
A HIGH PRESSURE RIDGE ANCHORED OVER NORTHERN CA/NV THROUGH
MIDWEEK. THIS RIDGE IS PROJECTED TO RETREAT TO OFF THE PACIFIC NW
COAST BY LATE WEEK BUT THEN RETURN INLAND FOR THE UPCOMING
WEEKEND.
VALLEY INVERSIONS WILL CONTINUE WITH TYPICALLY CHILLY JANUARY
NIGHTS DUE TO THE DRY AIR MASS/MAINLY CLEAR SKIES AND LIGHT
WINDS. HAZY CONDITIONS ESPECIALLY AROUND URBAN AREAS ARE LIKELY
TO BE WITH US FOR A WHILE, MOST NOTABLY IN THE MORNINGS. DAYTIME
TEMPERATURES WILL SLOWLY REBOUND TO NEAR AVERAGE TODAY-TUESDAY,
WITH HIGHS CREEPING ABOVE AVERAGE (MAINLY IN THE LOWER-MID 50S)
FROM MIDWEEK ONWARD. MOST SIERRA COMMUNITIES WILL HAVE DAYTIME
HIGHS SIMILAR TO, OR EVEN A BIT WARMER THAN LOWER ELEVATIONS, AS
THE INVERSIONS AT THESE HIGHER ELEVATIONS HAVE LESS OF A COLD AIR
LAYER TRAPPED NEAR THE SURFACE TO OVERCOME. HOWEVER, ONE EXCEPTION
IS AROUND MONO LAKE, WHERE PERSISTENT FREEZING FOG WILL KEEP
TEMPERATURES MUCH COOLER (REMAINING IN THE 20S) WITH POOR
VISIBILITY AND PATCHY SLICK CONDITIONS ON US-395 NEAR LEE VINING.
ABOVE THE INVERSIONS AT SIERRA RIDGE TOPS, BREEZY TO GUSTY EAST
WINDS ARE ONGOING AND WILL CONTINUE THROUGH MUCH OF THIS WEEK.
THESE GUSTS ARE LIKELY TO RAMP UP TO 40-50 MPH AT TIMES THROUGH
TONIGHT. ANOTHER PERIOD OF ENHANCED RIDGE TOP GUSTS MAY RETURN
LATE THURSDAY-THURSDAY NIGHT, ALTHOUGH CONFIDENCE IS LOWER DUE TO
SOME VARIANCE IN THE EVENTUAL LOCATION OF THE RIDGE CENTER AND THE
WESTWARD EXTENT OF A TROUGH DROPPING INTO THE ROCKIES AND/OR THE
CENTRAL US. MJD
AVIATION
PATCHY FZFG WILL CONTINUE THROUGH THIS MORNING AT KTRK WITH
IFR/LIFR CONDITIONS AT TIMES UNTIL AROUND 17Z. WHILE AN EAST FLOW
FOR LATE TONIGHT/EARLY TUESDAY NORMALLY LIMITS FZFG COVERAGE,
RESIDUAL MOISTURE FROM MELTING/REFREEZING OF EXISTING SNOW COVER
KEEPS SHALLOWER FOG IN PLAY AGAIN AROUND KTRK, MAINLY BETWEEN
10-15Z.
OTHERWISE, VFR CONDITIONS AND LIGHT SURFACE BREEZES PREVAIL TODAY
AND THROUGH MUCH OF THIS WEEK AT THE MAIN TERMINALS, WITH MINOR
SLANTWISE VISIBILITY REDUCTIONS DUE TO HAZE AROUND THE W NV
TERMINALS.
E/NE FL100 WIND GUSTS OF 35-45 KT ALONG THE SIERRA CREST THROUGH
EARLY TUESDAY MORNING COULD PRODUCE AREAS OF TURBULENCE FOR
FLIGHTS CROSSING THE SIERRA. MJD
REV WATCHES/WARNINGS/ADVISORIES
NV...NONE.
CA...NONE.
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