928
FXUS65 KVEF 130445
AFDVEF
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
944 PM PDT WED AUG 12 2026
KEY MESSAGES
* THIS AFTERNOON OFFERS WIDESPREAD CHANCES FOR STORMS WITH AN
INCREASED RISK FOR FLOODING IN MOHAVE COUNTY AZ, WITH A FLASH
FLOOD WATCH ISSUED FROM NOON THROUGH MIDNIGHT.
* DAILY AFTERNOON TO EVENING ISOLATED THUNDERSTORM CHANCES WILL
CONTINUE THROUGH THE LATE WEEK, WITH THE GREATEST CHANCES OVER
HIGHER TERRAIN AND SOME STORMS SPREADING INTO ADJACENT VALLEYS.
DISCUSSION
THROUGH TUESDAY.
TODAY IS SHAPING UP TO BE ONE OF THE MOST ACTIVE MONSOON DAYS OF
THE SEASON THUS FAR. LATEST SPC MESOANALYSIS SHOWS THE 1" PWAT
CONTOUR EXTENDING ALL THE WAY UP INTO THE SOUTHERN GREAT BASIN.
WITH MOSTLY SUNNY SKIES WEST OF THE COLORADO RIVER AND A SUBTLE
TROUGH APPROACHING OFF THE PACIFIC, ALL THE INGREDIENTS ARE THERE
FOR SCATTERED STORMS ACROSS THE AREA. MAIN CONCERNS WILL BE FLASH
FLOODING AND GUSTY OUTFLOW WINDS. MORNING CONVECTION IN CENTRAL
MOHAVE COUNTY PRODUCED IMPRESSIVE RAIN RATES/TOTALS, BUT WILL
LIKELY LIMIT (OR AT LEAST DELAY) ADDITIONAL ACTIVITY IN THIS AREA
AS THE ATMOSPHERE HAS BEEN WORKED OVER. THIS COULD SET UP AN
INSTABILITY GRADIENT FOR AFTERNOON STORMS TO RUN ALONG, PUSHING
THEM DOWN THE LOWER COLORADO RIVER VALLEY. SPC HAS HIGHLIGHTED
THIS AREA WITH A MARGINAL RISK OF SEVERE WINDS. ACTIVITY MAY
LINGER IN THE SOUTHERN GREAT BASIN AND LOWER COLORADO RIVER VALLEY
THIS EVENING, BUT THINGS SHOULD LARGELY BE ON THE DOWNTREND
AROUND SUNSET.
TOMORROW, THE TROUGH MOVES A BIT CLOSER AND FLOW ALOFT
STRENGTHENS. THIS WILL SPEED UP STORM MOVEMENT, REDUCING THE
RISK OF FLASH FLOODING OUTSIDE OF TRAINING STORMS. HOWEVER, THIS
STRONGER FLOW ALOFT WILL ALSO PRODUCE AN UPTICK IN VERTICAL WIND
SHEAR, POTENTIALLY ALLOWING FOR MORE ORGANIZED CONVECTION. THIS
SIGNAL IS MOST CLEAR IN THE SOUTHERN GREAT BASIN WHERE THE LATEST
HREF INDICATES 70-90% PROBABILITIES OF 30+ KNOT THUNDERSTORM WINDS
AND A 10-20% CHANCE OF 50+ KNOTS. WOULDN'T RULE OUT THE POTENTIAL
FOR HAIL AS WELL THANKS TO MODESTLY ROTATING UPDRAFTS DEPICTED IN
SOME CAMS. STORM COVERAGE ACROSS THE MOJAVE DESERT SHOULD BE MORE
ISOLATED IN NATURE ON THURSDAY. ON FRIDAY, THE SOUTHWESTERLY FLOW
PUSHES MOISTURE MAINLY INTO SOUTHEASTERN NV AND NORTHWESTERN AZ,
WHERE ISOLATED TO SCATTERED CONVECTION IS YET AGAIN POSSIBLE IN
THE AFTERNOON HOURS. DRIER CONDITIONS WITH JUST ISOLATED ACTIVITY
POSSIBLE OVER THE WEEKEND.
AVIATION...FOR HARRY REID
FOR THE 06Z FORECAST
PACKAGE...ANY ISOLATED SHOWERS OR THUNDERSTORMS WILL MOVE AWAY AND
END IN THE NEXT 1 TO 2 HOURS. WINDS HAVE BECOME WEST DUE TO ONGOING
CONVECTION WHICH SHOULD LAST A FEW MORE HOURS. BY 09Z, LIGHT WINDS
ARE EXPECTED FOR THE OVERNIGHT PERIOD AS DRY WEATHER DEVELOPS
OVERNIGHT THROUGH THURSDAY MORNING. CONVECTION IS EXPECTED TO
DEVELOP AGAIN THURSDAY AFTERNOON WITH MORE COVERAGE THAN PREVIOUS
DAYS. 40%-50% CHANCE OF THUNDERSTORMS AFTER 20Z AT THE TERMINALS
WHICH COULD RESULT IN HEAVY RAIN, VISIBILITY UNDER 5SM, SUDDEN GUSTY
WINDS, AND CIGS BELOW 8000FT. OUTSIDE OF CONVECTION, SOUTH TO
SOUTHEAST WINDS WILL INCREASE TO 10-15KT WITH OCCASIONAL GUSTS OVER
TO 20KT ARE EXPECTED. LOW CONFIDENCE IN THE WIND FORECAST THURSDAY
EVENING AFTER THUNDERSTORMS WANE AS WIND DIRECTION MAY DEPEND ON
AFTERNOON CONVECTION. LIGHT WINDS WILL EVENTUALLY SET UP THURSDAY
NIGHT. VFR CONDITIONS WITH SCT-BKN CLOUDS OVER 10KFT ARE EXPECTED
THROUGH THE PERIOD.
FOR THE REST OF SOUTHERN NEVADA, NORTHWEST ARIZONA AND SOUTHEAST
CALIFORNIA...FOR THE 06Z FORECAST PACKAGE...SHOWERS AND
THUNDERSTORMS WILL PERSIST A FEW MORE HOURS IN THE SOUTHERN GREAT
BASIN AND WESTERN ARIZONA TONIGHT BEFORE DIMINISHING AFTER 09Z. ANY
LINGERING STORMS COULD PRODUCE BRIEF HEAVY RAIN, LIGHTNING, AND
SUDDEN GUSTY WINDS OVER 30 KT. AFTER CONVECTION ENDS, TYPICAL
OVERNIGHT WIND PATTERNS ARE EXPECTED THE REST OF THE NIGHT.
CONVECTION WILL DEVELOP AGAIN THURSDAY AFTERNOON ACROSS INYO
SOUTHERN INTO SOUTHERN NEVADA, WITH LESSER CHANCES FURTHER SOUTH.
ANY STORMS COULD PRODUCE LIGHTNING, HEAVY RAIN, SUDDEN GUSTY WINDS,
AND CIGS BELOW 8000FT. OUTSIDE OF CONVECTIVE INFLUENCES, SOUTH TO
SOUTHWEST WINDS 10-15KT WITH GUSTS TO AROUND 20KT WILL DEVELOP
THURSDAY AFTERNOON. WIND AND CONVECTION WILL DIMINISH AFTER SUNSET
THURSDAY.
SPOTTER INFORMATION STATEMENT
SPOTTERS ARE ENCOURAGED TO REPORT
ANY SIGNIFICANT WEATHER OR IMPACTS ACCORDING TO STANDARD OPERATING
PROCEDURES.
DISCUSSION...WOODS
AVIATION...NICKERSON
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