241
FXUS65 KREV 290823
AFDREV
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
1223 AM PST MON DEC 29 2025
KEY MESSAGES
* COLD OVERNIGHT LOWS WITH DRY WEATHER CONTINUES WITH POTENTIAL
FOR FREEZING FOG IN THE SIERRA AGAIN TONIGHT.
* QUIET WEATHER WITH MORNING INVERSIONS LEADING TO AIR STAGNATION
IS EXPECTED THIS WEEK OVER WESTERN NV VALLEYS.
* ANOTHER SERIES OF WINTER STORMS ARRIVES AS EARLY AS NEW YEARS
DAY, CONTINUING THROUGH WEEKEND.
DISCUSSION
THIS MORNING WILL BE THE COLDEST MORNING OF THE WEEK WITH MANY
LOWS IN THE SINGLE DIGITS ACROSS THE SIERRA AND UPPER TEENS FOR
VALLEY LOCATIONS. LIGHT WINDS WILL ALLOW VALLEY INVERSIONS TO SET
UP EACH MORNING THROUGH AT LEAST WEDNESDAY. ADDITIONALLY, FREEZING
FOG WILL LIKELY SET UP EACH NIGHT FOR FOG-PRONE SIERRA LOCATIONS,
CONTINUING THROUGH DAYBREAK.
TODAY WILL INITIATE A WARMING TREND, THOUGH, WITH AFTERNOON HIGH
TEMPERATURES BACK TO NEAR NORMAL BY WEDNESDAY (UPPER 40S FOR MUCH
OF THE AREA). RIDGE WINDS MAY REMAIN GUSTY THIS WEEK, BUT ONLY
RECEIVE AN UPTICK AFTER THE CALENDAR TURNS TO 2026. TWO INCOMING
STORM SYSTEMS ARE ON THE HORIZON THIS WEEK, WITH THE FIRST
BRINGING IMPACTS AS EARLY AS THE AFTERNOON OF NEW YEARS DAY.
THIS FIRST LOW PRESSURE SYSTEM IS CURRENTLY SPINNING OFF THE
COAST OF BAJA CALIFORNIA AND, DEPENDING ON THE TRAJECTORY, COULD
BRING RAIN SHOWERS INTO PARTS OF W NV OVERNIGHT WEDNESDAY THROUGH
THURSDAY. BECAUSE THIS SYSTEM IS OF A SOUTHERN ORIGIN, SNOW LEVELS
WILL BE MUCH HIGHER, ABOVE 9 KFT AT THE STORM'S ONSET LATE
WEDNESDAY NIGHT. THEY'RE FORECASTED TO DROP STEADILY TO AROUND 8
KFT BY THURSDAY NIGHT. HOWEVER, DUE TO THE NATURE OF THIS SMALL-
SCALE FEATURE, IT'S A BIT HARDER TO IRON OUT THE DETAILS ON
SNOWFALL AND LIQUID TOTALS AT THIS POINT IN TIME. WITH HIGH SNOW
LEVELS, THERE MAY BE RENEWED HYDROLOGY CONCERNS, ESPECIALLY ALONG
THE SUSAN RIVER, AS THERE'S BEEN RECENT FLOODING AND SOILS ARE
SATURATED.
THE SECOND SYSTEM COMES IN ON THE HEELS OF THAT BAJA LOW, BRINGING
INCREASED WINDS FRIDAY AND THROUGH THE WEEKEND. THIS SECOND SYSTEM
IS ALSO COLDER, WITH SNOW LEVELS BETWEEN 5-6 KFT. THERE'S STILL
PLENTY OF MODEL UNCERTAINTY ON THE PLACEMENT AND TIMING OF THIS
SYSTEM SO STAY TUNED FOR MORE DETAILS AS WE GET CLOSER.
-GIRALTE
AVIATION
VFR CONDITIONS PREVAIL FOR MUCH OF THE REGION THROUGH WEDNESDAY
WITH LIGHT WINDS. THE ONLY EXCEPTION WILL BE FZFG FOR SIERRA
VALLEYS, LIKELY UNTIL 18Z THIS MORNING, ESPECIALLY FOR KTRK. FZFG
IS EXPECTED TO RENEW AGAIN TONIGHT, AROUND OR AFTER 06Z.
ADDITIONALLY, MORNING VALLEY INVERSIONS MAY PRODUCE SLANTWISE
VISIBILITY CONCERNS, PRIMARILY FOR SIERRA FRONT TERMINALS.
-GIRALTE
REV WATCHES/WARNINGS/ADVISORIES
NV...NONE.
CA...NONE.
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