Rain-cooled air produced strong outflow winds in a few locations. No lightning was observed during the event.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS VEF wrote it up.
Rain-cooled air produced strong outflow winds in a few locations. No lightning was observed during the event.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Las Vegas, NV wrote its last area forecast discussion before the first event at Jul 4, 9:05 AM PST, 3 hours 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 1005 AM PDT WED JUL 4 2012 .SYNOPSIS...MONSOON MOISTURE WILL SPREAD OVER THE MOHAVE DESERT AND PORTIONS OF THE SOUTHERN GREAT BASIN TODAY...RESULTING IN SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS. SLIGHTLY DRIER CONDITIONS ARE EXPECTED THURSDAY AND FRIDAY...HOWEVER THERE WILL REMAIN A SLIGHT CHANCE FOR THUNDERSTORMS MAINLY OVER NORTHWEST ARIZONA...NORTHEAST CLARK AND NORTHEAST LINCOLN COUNTIES GOING INTO THE WEEKEND. && .UPDATE...MONSOON MOISTURE BEING PULLED FURTHER WEST AND NORTH OVER INYO COUNTY BY WEAK UPPER TROUGH ALONG THE WEST COAST. COOP AND ALERT STATIONS FROM THE MORONGO VALLEY UP TOWARD BARSTOW REPORTED SEVERAL HUNDREDTHS OF AN INCH OF RAIN EARLIER THIS MORNING. A NEW BAND OF SHOWERS WAS MOVING INTO SOUTHEAST SAN BERNARDINO AND SOUTHERN MOHAVE COUNTY AS OF THIS WRITING. THIS BAND IS ASSOCIATED WITH A H7-H5 SHORTWAVE WHICH WAS ANALYZED OVER SOUTHERN ARIZONA THIS MORNING. THE RIPPLE WILL CONTINUE TO DRIFT NORTH THROUGH THE DAY AND INTO THIS EVENING. A MODIFIED LAS VEGAS SOUNDING AS WELL AS THE NAM BURF SOUNDING PRODUCES LITTLE OR NOT CAPE. DUE TO CONSIDERABLE AMOUNT OF CLOUD COVER AND LACK OF CAPE TO SUPPORT STRONG UPDRAFTS...THINKING THAT ATMOSPHERE WILL REMAIN STRATIFIED AND SUPPORT RAIN SHOWERS WHILE ANY THUNDERSTORMS WILL BE VERY ISOLATED. UPDATED PACKAGE IS OUT WHICH INCREASED CLOUD ESPECIALLY OVER INYO COUNTY AND DID TRIM A FEW MORE DEGREES OFF TODAYS HIGHS. && .AVIATION...FOR MCCARRAN...SOUTHERLY WINDS GENERALLY AROUND 10KTS THROUGH TONIGHT WITH GUSTS AROUND 20KTS ON AVERAGE DURING THE AFTERNOON AND EARLY EVENING. MOSTLY CLOUDY SKIES ARE EXPECTED THROUGH TONIGHT WITH ISOLATED RAIN SHOWERS POSSIBLE THIS AFTERNOON THROUGH TONIGHT. CEILINGS WILL DROP TO AS LOW AS 7KFT AT TIMES. TEMPERATURES ARE FORECAST TO REMAIN BELOW 100F TODAY. FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST CALIFORNIA...WINDS WILL BE MAINLY SOUTHERLY AT 10-15KTS WITH GUSTS 20-25KTS. MOSTLY CLOUDY SKIES AND ISOLATED TO SCATTERED SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS ARE EXPECTED ACROSS MOHAVE...SAN BERNARDINO...CLARK AND LINCOLN COUNTIES THIS AFTERNOON THROUGH TONIGHT. THE BEST CHANCE OF THUNDERSTORMS WILL BE OVER MOHAVE COUNTY. THUNDERSTORMS WILL PRODUCE GUSTY AND ERRATIC WINDS. CEILINGS IN THUNDERSTORMS COULD DROP TO AS LOW AS 7KFT. && .FIRE WEATHER...MONSOON MOISTURE SPREADING NORTH TODAY WITH ISOLATED TO SCATTERED RAIN SHOWERS ALONG WITH A SLIGHT CHANCE OF THUNDERSTORMS EXPECTED OVER MOHAVE...THE EASTERN TWO THIRDS OF SAN BERNARDINO COUNTY...CLARK AND PORTIONS OF LINCOLN COUNTY INTO THIS EVENING. THERE STILL IS SOME CONCERN WITH DRY THUNDERSTORMS WITH RAIN AMOUNTS GENERALLY LESS THAN A TENTH OF AN INCH FROM THE RAIN SHOWERS. MOISTURE STILL APPEARS TO SHIFT EAST ON THURSDAY AND INTO FRIDAY WITH THE MAIN AREA OF CONCERN FOR THUNDERSTORM DEVELOPMENT REMAINING OVER MOHAVE/ERN CLARK AND ERN LINCOLN COUNTIES INTO THE WEEKEND. && .PREV DISCUSSION... 252 AM PDT WED JUL 4 2012 .SHORT TERM...TODAY THROUGH FRIDAY NIGHT...MONSOON MOISTURE CONTINUES TO MOVE INTO THE SOUTHEAST PORTION OF THE CWA THIS MORNING AS YUMA VAD WIND PROFILE SHOWING SOLID SOUTHERLY FLOW THROUGH THE LOWER 6K FEET BEFORE TURNING MORE SOUTHEAST AND DEWPOINTS HAVE INCREASED INTO THE MID 40S AS FAR NORTH AS THE KLAS VALLEY AND WEST TO KDAG. HOWEVER PER THE PREVIOUS DISCUSSION...THERE CONTINUES TO BE CONSIDERABLE UNCERTAINTY ON THE OUTCOME OF THIS MOISTURE PUSH. TAKING A LOOK AT THE MODELS...THE ECMWF CONTINUES TO CONCENTRATE THE MAIN ACTIVITY TODAY AND THURSDAY OVER MOHAVE COUNTY ARIZONA...WHILE THE GFS INDICATING THE BEST DYNAMICS TO BE MAINLY SOUTH OF INTERSTATE 15 TODAY AND THEN DRYING FROM THE WEST AND MORE STABLE ON THURSDAY...WHILE THE NAM IS SHOWING THURSDAY WILL BE THE BEST DAY FOR THUNDERSTORMS...BUT ALSO DRYING FROM THE WEST ON THURSDAY. THE WEAK WAVE WHICH WE HAVE BEEN DISCUSSING THE PAST FEW DAYS WILL BE CROSSING OVER THE CWA TODAY/TONIGHT AND THEN SHIFTING OUT OF THE AREA ON THURSDAY. THIS WOULD TEND TO PROVIDE BETTER LIFT AND TREND TOWARDS THE GFS BEING THE BEST MODEL. HOWEVER A MAJOR PROBLEM IS THAT A LARGE AREA OF DEBRIS CLOUDS HAS MOVED OVER MOST OF SAN BERNARDINO/CLARK/MOHAVE COUNTY OVERNIGHT WHICH WILL HAMPER HEATING DURING AT LEAST THE INITIAL PART OF THE DAY. WITH ALL THIS IN MIND...THE BEST AREA FOR CONVECTION TODAY WILL BE OVER MOHAVE COUNTY AS LESS INITIAL CLOUDINESS EXPECTED/BEST INSTABILITY/HIGHEST THETA-E VALUES AND PWAT VALUES PUSHING TO NEAR 2 INCHES ARE EXPECTED. THUS WILL CONTINUE SCATTERED THUNDERSTORMS IN THIS AREA WITH POPS TRENDING TOWARDS 30-50 PERCENT AND THEN CONTINUE TO LEAN TOWARDS THE GFS WITH ISOLATED TO SCATTERED THUNDERSTORMS MAINLY SOUTH OF INTERSTATE 15. EXPECT THAT AS THE WAVE SHIFTS OVER/BEGINS TO EXIT THE CWA TONIGHT...THAT ISOLATED/SCATTERED CONVECTION WILL CONTINUE THROUGH THE OVERNIGHT HOURS LEADING INTO THURSDAY. SINCE THE NAM/GFS ARE SHOWING DRYING FROM THE WEST ON THURSDAY...WILL PULL BACK ON MENTION OF THUNDERSTORMS FOR THURSDAY TO MAINLY LINCOLN/CLARK/MOHAVE COUNTIES AND ALTHOUGH THE MAIN ACTIVITY WILL ONCE AGAIN BE IN THE AFTERNOON/EVENING...NOT OUT OF THE QUESTION THAT ISOLATED STORMS WILL CONTINUE INTO EARLY FRIDAY MORNING WITH FRIDAY/S ACTIVITY BEING CONFINED TO MAINLY MOHAVE AND THE EASTERN PORTION OF LINCOLN COUNTIES. WITH THE CLOUD COVER OVER THE SOUTHERN THIRD OF THE FORECAST AREA TODAY...EXPECT DAYTIME TEMPERATURES WILL BE BELOW NORMAL WHICH WILL ALSO CONTINUE INTO THURSDAY. BY FRIDAY WITH THE EXPECTANT DRIER CONDITIONS...LOOK FOR TEMPERATURES TO WARM TO NEAR NORMAL. MEANWHILE THE NORTHWEST PORTION OF THE AREA SHOULD CONTINUE TO SEE NEAR TO ABOVE NORMAL READINGS THROUGH THE SHORT TERM. .LONG TERM...SATURDAY THROUGH TUESDAY...MID/UPPER LEVEL HIGH PRESSURE WILL BE CENTERED WAY EAST OF THE AREA SATURDAY...OVER IOWA AND MISSOURI. THIS IS NOT THE FAVORED POSITION FOR BRINGING IN ABUNDANT MONSOON MOISTURE AND THE MODELS ARE KEEPING MOISTURE AND INSTABILITY MAINLY EAST OF THE FORECAST AREA. HOWEVER...THE HIGH DOES STRETCH BACK WEST ACROSS MUCH OF THE SOUTHWEST AND WITH A WEAK SOUTH TO SOUTHEAST FLOW OVER THE AREA...I AM NOT WILLING TO TOTALLY REMOVE MENTION OF THUNDERSTORMS. I LEFT A SLIGHT CHANCE IN FOR EASTERN PORTIONS OF LINCOLN AND MOHAVE COUNTIES. THE HIGH IS THEN FORECAST TO GRADUALLY SHIFT WESTWARD. HOWEVER...THE MODELS STILL KEEP MOISTURE AND INSTABILITY MAINLY EAST OF THE AREA SO I JUST KEPT A SLIGHT CHANCE OF THUNDERSTORMS IN THE SAME AREAS FOR SUNDAY THROUGH TUESDAY. MODEL SOUNDINGS INDICATE A WARM/STABLE LAYER AT 600-500MB WHICH WILL KEEP THINGS CAPPED OVER THE MAJORITY OF THE FORECAST AREA. MODELS ARE HINTING THAT THE HIGH MAY ACTUALLY BECOME CENTERED ROUGHLY OVER NEVADA BY TUESDAY WHICH WOULD LIKELY CAP CONVECTION. WITH HEIGHTS RISING IN RESPONSE TO THE WESTWARD MIGRATION OF THE HIGH...TEMPERATURES WILL WARM TO SEVERAL DEGREES ABOVE NORMAL. && .VEF WATCHES/WARNINGS/ADVISORIES... NV...NONE. AZ...NONE. CA...NONE. && UPDATE...PIERCE PREV DISCUSSION...JENSEN/HARRISON HTTP://WEATHER.GOV/LASVEGAS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAS VEGAS NV 545 AM PDT WED JUL 4 2012 CAZ519>522-NVZ014-050000- EASTERN SIERRA SLOPES-OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY- DEATH VALLEY NATIONAL PARK-ESMERALDA AND CENTRAL NYE COUNTY- 545 AM PDT WED JUL 4 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA AND SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT NO WEATHER HAZARDOUS ARE EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO WEATHER HAZARDOUS ARE EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER, SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. CAZ523>526-050000- WESTERN MOJAVE DESERT-EASTERN MOJAVE DESERT-MORONGO BASIN- CADIZ BASIN- 545 AM PDT WED JUL 4 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY THROUGH THIS EVENING...BEFORE DECREASING OVERNIGHT. LOCAL GUSTY WINDS AND BRIEF HEAVY RAINFALL ESPECIALLY THIS AFTERNOON AND EVENING MAY BE SEEN FROM THESE STORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY DRYING IS EXPECTED ON THURSDAY WITH SHOWERS AND THUNDERSTORMS SHIFTING TO THE EAST OF THE AREA. NO HAZARDOUS WEATHER IS EXPECTED THURSDAY THROUGH TUESDAY. NO WEATHER HAZARDOUS ARE EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER, SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ001>003-036-CAZ527-NVZ015>022-050000- NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS- LAKE MEAD NATIONAL RECREATION AREA-SAN BERNARDINO COUNTY- UPPER COLORADO RIVER VALLEY-LINCOLN COUNTY-NORTHEAST CLARK COUNTY- WESTERN CLARK AND SOUTHERN NYE COUNTY-SHEEP RANGE- SPRING MOUNTAINS-LAS VEGAS VALLEY-SOUTHERN CLARK COUNTY- 545 AM PDT WED JUL 4 2012 /545 AM MST WED JUL 4 2012/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST ARIZONA...CALIFORNIA AND SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED... MAINLY THIS AFTERNOON AND EVENING...BUT ISOLATED STORMS ARE LIKELY THROUGH TONIGHT. THE MAIN CONCERN WITH THESE STORMS WILL BE LOCAL GUSTY WINDS. HOWEVER BRIEF HEAVY RAINFALL MAY CAUSE PONDING OF WATER AND OR FLOWING WATER IN NORMALLY DRY WASHES...ESPECIALLY ACROSS THE SOUTHERN PORTION OF MOHAVE COUNTY THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY ALTHOUGH MONSOON MOISTURE IS EXPECTED TO DECREASE ON THURSDAY... ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED OVER MUCH OF THE AREA. BY FRIDAY AND GOING INTO THE WEEKEND AND THEN INTO TUESDAY...THUNDERSTORMS ARE EXPECTED TO BE CONFINED TO MAINLY MOHAVE COUNTY AND THE EASTERN PORTION OF LINCOLN COUNTY. LOCAL GUSTY WINDS AND BRIEF HEAVY RAINFALL WILL CONTINUE TO BE POSSIBLE FROM THESE STORMS INTO EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER, SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The national radar mosaic for the moment the first event began.
1 high wind, 1 strong wind. Local standard time, as filed.
This gust occurred in the southwest corner of Las Vegas, 2 miles N of Sloan.
Strong outflow winds from rain-cooled air sank or capsized a total of six boats, mainly in the Callville Bay area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2012Every state in 2012This day in weather historyWarnings in Nevada, July 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 382302, 382303.