934
FXUS65 KVEF 192202
AFDVEF
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
302 PM PDT MON OCT 19 2026
KEY MESSAGES
* AN INCOMING TROUGH BRINGS WIDESPREAD RAIN AND MOUNTAIN SNOW
CHANCES, GUSTY WINDS, AND BELOW NORMAL TEMPERATURES MIDWEEK.
* INCREASING CONFIDENCE FOR A DRY CONDITIONS AND WARMING
TEMPERATURES THIS WEEKEND.
DISCUSSION
THROUGH THE WEEKEND.
AN UPPER LEVEL TROUGH, CURRENTLY CENTERED OFF THE COAST OF OREGON,
WILL BRING SIGNIFICANT CHANCES IN THE WEATHER PATTERN THIS WEEK AS
IT PLUNGES SOUTH AND EAST. PRECIPITATION CHANCES START TO APPEAR
OVER HIGH TERRAIN ON TUESDAY AFTERNOON DUE TO INCREASING MOISTURE
AND DIFLUENCE ALOFT. HOWEVER, MORE WIDESPREAD PRECIPITATION IS
EXPECTED ON WEDNESDAY AND THURSDAY AS THE TROUGH MOVES INTO SOUTHERN
CALIFORNIA. MOISTURE ADVECTION BRINGS PWATS INTO THE 0.5 TO 1.0 INCH
RANGE, WHICH IS 200 TO 300 PERCENT OF NORMAL FOR LATE OCTOBER.
ELEVATED MOISTURE COMBINED WITH INSTABILITY DRIVEN BY STRONG WINDS
ALOFT AND COLD AIR UNDER THE LOW MAY PROMPT PARTICULARLY EFFICIENT
RAIN RATES ON WEDNESDAY AND THURSDAY. FORECAST SOUNDINGS SHOW 500-
1000 J/KG MUCAPE AND 40+ KNOTS OF SHEAR STARTING WEDNESDAY AFTERNOON
IN SOUTHERN NEVADA AND NORTHWESTERN ARIZONA. SNOW LEVELS REMAIN
ABOVE 10,000 FEET ON WEDNESDAY AND FALL TO AROUND 8,500 FEET ON
THURSDAY. ALTHOUGH THE TROUGH MOVES EAST BY FRIDAY, LINGERING
MOISTURE AND INSTABILITY MAY SUPPORT ADDITIONAL SHOWERS OVER HIGH
TERRAIN. FORECAST CONFIDENCE IN TIMING FOR SPECIFIC LOCATIONS SHOULD
INCREASE WITH ADDITIONAL HIGH RESOLUTION GUIDANCE.
ANOTHER NOTABLE IMPACT WILL BE INCREASED WINDS STARTING TUESDAY. 850
MB WIND SPEEDS INCREASE TO 25 TO 30 KNOTS. FOR TUESDAY, THE
STRONGEST SURFACE WINDS WILL BE IN THE OWENS VALLEY AND SOUTHERN
GREAT BASIN. PEAK GUSTS WILL GENERALLY BE IN THE 25 TO 35 MPH RANGE,
WITH A LOW PROBABILITY (10-20%) OF WIND GUSTS REACHING 40 MPH IN THE
AFTERNOON. SOUTHERLY WINDS SPREAD TO MOST OF THE REMAINDER OF THE
FORECAST AREA ON WEDNESDAY AS THE LOW TRACKS SOUTHEAST. LINGERING
SOUTHWESTERLY BREEZES REMAIN ACROSS THE MOJAVE DESERT ON THURSDAY
BEFORE THE SYSTEM MOVES OUT.
A RIDGE SHOULD DEVELOP THIS WEEKEND AS THE TROUGH MOVES OFF INTO THE
FOUR CORNERS. MOISTURE WILL SCOUR OUT AND DRY CONDITIONS ARE
EXPECTED. TEMPERATURES REMAIN SEVERAL DEGREES BELOW NORMAL FOR THIS
TIME OF YEAR, BUT WILL INCREASE A DEGREE OR TWO COMPARED TO
TEMPERATURES MIDWEEK.
AVIATION...FOR HARRY REID...FOR THE 00Z FORECAST PACKAGE
FAIRLY QUIET AND BENIGN CONDITIONS EXPECTED FOR THE NEXT 24-30
HOURS. LIGHT WINDS FAVORING AN E TO NE DIRECTION UNDER 8KT CONTINUE
INTO THE EVENING. AROUND 04Z, LIGHT WINDS SHIFT TO A MORE WSW
DIRECTION AND REMAIN LIGHT AND VARIABLE THROUGHOUT THE NIGHT.
SIMILAR PATTERN EXPECTED TUESDAY WITH LIGHT E-NE WINDS DEVELOPING
AFTER 17-18Z, BECOMING SE DURING THE AFTERNOON AROUND AND UNDER 8
KT. VFR CONDITIONS WILL CONTINUE WITH A FEW PASSING CLOUDS AROUND 10-
12KFT. ISOLATED CONVECTION POSSIBLE IN HIGHER TERRAIN TOMORROW BUT
NO IMPACTS TO KLAS ARE CURRENTLY EXPECTED.
FOR THE REST OF SOUTHERN NEVADA, NORTHWEST ARIZONA AND SOUTHEAST
CALIFORNIA...FOR THE 00Z FORECAST PACKAGE...QUIET AND BENIGN
CONDITIONS TO PERSIST THROUGH THE TAF PERIOD FOR MOST SITES. WINDS
FOLLOW TYPICAL DAILY DIRECTIONAL PATTERNS AND REMAIN AROUND 8KT OR
LESS THE NEXT 24 HOURS. THE ONLY EXCEPTION WILL BE KBIH, WHERE
SOUTHEASTERLY UP-VALLEY WINDS GUSTING TO 15-25KT CONTINUE THIS
EVENING, THEN REDEVELOP AGAIN AFTER 18Z TOMORROW GUSTING UP TO 30
KT. ELEVATED SOUTHERLY WINDS MAY PERSIST A FEW HOURS AFTER SUNSET AT
KBIH BEFORE BECOMING LIGHT AND NORTHERLY AFTER 06Z. VFR CONDITIONS
PREVAIL WITH NO OPERATIONALLY SIGNIFICANT CLOUD COVER. ISOLATED
CONVECTION POSSIBLE IN HIGHER TERRAIN TOMORROW BUT NO IMPACTS TO
TERMINALS ARE CURRENTLY EXPECTED.
SPOTTER INFORMATION STATEMENT
SPOTTERS ARE ENCOURAGED TO REPORT
ANY SIGNIFICANT WEATHER OR IMPACTS ACCORDING TO STANDARD OPERATING
PROCEDURES.
DISCUSSION...MELTZER
AVIATION...MOORE
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