657
FXUS65 KVEF 041839
AFDVEF
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
1139 AM PDT FRI JUL 4 2025
KEY MESSAGES
* BREEZY AND DRY CONDITIONS WILL PROMOTE HIGH FIRE SPREAD
POTENTIAL TODAY AND TONIGHT.
* AREAS OF HAZE AND SMOKE FROM DISTANT WILDFIRES WILL SPREAD
ACROSS MUCH OF SOUTHERN NEVADA AND CALIFORNIA TODAY THROUGH THE
WEEKEND.
* POTENTIAL FOR A SIGNIFICANT HEAT WAVE IS INCREASING FROM THE
MIDDLE OF NEXT WEEK INTO NEXT WEEKEND. THIS LOOKS TO BE THE
HOTTEST WEATHER WE HAVE SEEN SINCE LAST SUMMER.
DISCUSSION
WILDFIRE DANGER WILL BE HEIGHTENED TODAY DUE TO THE COMBINATION
OF HOT, DRY AND BREEZY WEATHER, AND JULY 4TH ACTIVITIES. SEE THE
FIRE WEATHER DISCUSSION BELOW FOR MORE DETAILS.
ONGOING WILDFIRES ACROSS SOUTHERN CALIFORNIA, MOST NOTABLY THE
MADRE FIRE BURNING NORTH OF SANTA MARIA, WILL CONTINUE TO GENERATE
SMOKE AND HAZE. AS SOUTHWESTERLY WINDS OVERSPREAD THE REGION
TODAY INTO THE WEEKEND, EXPECT AT LEAST PATCHY SMOKE AND
WIDESPREAD HAZE TO AFFECT MUCH OF ADJACENT SOUTHERN CALIFORNIA AND
SOUTHERN NEVADA. THIS COMBINED WITH JULY 4TH FESTIVITIES MAY
RESULT IN POOR AIR QUALITY TODAY THROUGH THE WEEKEND. FOLLOW THE
GUIDANCE OF LOCAL AIR QUALITY AGENCIES IF YOU HAVE OUTDOOR PLANS
OVER THE HOLIDAY WEEKEND.
AS WE GET INTO NEXT WEEK, ENSEMBLES DEPICT A CUTOFF LOW OFF OF
THE SOUTHERN CALIFORNIA COAST WILL GRADUALLY RETROGRADE, ALLOWING
A POWERFUL UPPER RIDGE OF HIGH PRESSURE TO BUILD IN ACROSS THE
FOUR CORNERS REGION. THIS FEATURE WILL SLOWLY BUILD WESTWARD,
BECOMING POSITIONED OVER SOUTHERN CALIFORNIA, NEVADA AND WESTERN
ARIZONA. LONG-RANGE ENSEMBLES ARE RATHER CONFIDENT ON THIS
DOMINANT RIDGE HAVING A PROLONGED PRESENCE ACROSS THE DESERT
SOUTHWEST. AS SUCH, THE POTENTIAL FOR A SIGNIFICANT MULTI-DAY HEAT
EVENT ARE ON THE RISE. HEAT RISK WILL CLIMB DAILY, WITH
WIDESPREAD MAJOR TO EXTREME HEAT RISK EVIDENT WEDNESDAY AND
THURSDAY OF NEXT WEEK, LIKELY CONTINUING THROUGH THE FOLLOWING
WEEKEND. WE WILL HAVE TO MONITOR TRENDS CLOSELY AS THIS FEATURE
LOOKS TO BRING THE HOTTEST WEATHER WE HAVE SEEN SINCE LAST SUMMER.
FIRE WEATHER
THE COMBINATION OF HOT AND DRY WEATHER WITH
INCREASING SOUTHWESTERLY BREEZES WILL LEAD TO HIGH FIRE SPREAD
POTENTIAL TODAY INTO EARLY TONIGHT. THIS COMBINED WITH DRY
VEGETATION AND JULY 4TH ACTIVITIES WILL LEAD TO AN INCREASED RISK OF
WILDFIRES. RED FLAG WARNINGS REMAIN IN EFFECT FOR MUCH OF SOUTHERN
NEVADA INTO WESTERN ARIZONA BEGINNING LATE THIS MORNING AND LASTING
INTO TONIGHT. HOT AND DRY CONDITIONS WILL PERSIST INTO THE WEEKEND
AND BEYOND, BUT WINDS WILL GENERALLY BE ON A DOWNWARD TREND.
AVIATION...FOR HARRY REID...FOR THE 18Z FORECAST PACKAGE
GUSTY
SOUTH-SOUTHWESTERLY WINDS WILL CONTINUE TO PICK UP THROUGH THE
AFTERNOON, WITH PEAK GUSTS AROUND 25 KTS. GUSTS WILL WANE IN SPEED
AND FREQUENCY AFTER SUNSET, BUT CANNOT RULE OUT OCCASIONAL GUSTS TO
20 KTS BEFORE THEY COMPLETELY FALL OFF. WINDS WILL REMAIN ELEVATED
FROM THE SOUTH OVERNIGHT BEFORE GUSTY SOUTHWEST WINDS 20-25 KTS
RETURN SATURDAY AFTERNOON. SLANTWISE VISIBILITY REDUCTIONS EXPECTED
FROM THE DAGGETT AND BEATTY CORRIDORS DUE TO SMOKE FROM THE MADRE
FIRE IN SOUTHERN CALIFORNIA. FIREWORK-RELATED SURFACE SMOKE EXPECTED
BETWEEN 04 AND 06Z THIS EVENING. TEMPERATURES WILL BRIEFLY REACH 100
DEGREES BETWEEN 22 AND 01Z.
FOR THE REST OF SOUTHERN NEVADA, NORTHWESTERN ARIZONA, AND
SOUTHEASTERN CALIFORNIA...FOR THE 18Z FORECAST PACKAGE...GUSTY
SOUTHWESTERLY WINDS EXPECTED THIS AFTERNOON BETWEEN 20 AND 30 KTS
FOR LAS VEGAS VALLEY TAF SITES AND KBIH... FROM THE SOUTH FOR
COLORADO RIVER VALLEY TAF SITES... FROM THE WEST FOR KDAG. WIND
GUSTS WILL DECREASE IN SPEED AND FREQUENCY OVERNIGHT, BUT SUSTAINED
WINDS WILL REMAIN ELEVATED THROUGH THE NIGHT. EXPECT SIMILAR WINDS
SATURDAY AFTERNOON, BUT TO A LESSER MAGNITUDE. SLANTWISE VISIBILITY
REDUCTIONS EXPECTED FROM THE DAGGETT AND BEATTY CORRIDORS DUE TO
SMOKE FROM THE MADRE FIRE IN SOUTHERN CALIFORNIA. FIREWORK-RELATED
SURFACE SMOKE EXPECTED IN THE LAS VEGAS VALLEY BETWEEN 04 AND 06Z
THIS EVENING.
SPOTTER INFORMATION STATEMENT
SPOTTERS ARE ENCOURAGED TO REPORT
ANY SIGNIFICANT WEATHER OR IMPACTS ACCORDING TO STANDARD OPERATING
PROCEDURES.
DISCUSSION/FIRE WEATHER...AUSTIN
AVIATION...SOULAT
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