A dissipating shower produced isolated high winds due to very dry subcloud air.
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The episode as NWS VEF wrote it up.
A dissipating shower produced isolated high winds due to very dry subcloud air.
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 12, 2:00 PM MST, 55 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTION NATIONAL WEATHER SERVICE LAS VEGAS NV 200 PM PDT SUN JUL 12 2009 CORRECTION TO LONG TERM WORDING .SYNOPSIS...AN AREA OF LOW PRESSURE OVER OREGON WILL CONTINUE TO PUSH INLAND ON MONDAY...ALLOWING A RIDGE OF HIGH PRESSURE TO EXPAND WESTWARD INTO THE DESERT SOUTHWEST BY MID WEEK. THE DEVELOPING RIDGE WILL PROVIDE DRY CONDITIONS AND A CONTINUATION OF THE ABOVE NORMAL TEMPERATURES ACROSS THE AREA. && .SHORT TERM...ISOLATED SHOWERS HAVE DEVELOPED ACROSS THE NORTHEASTERN PORTION OF MOHAVE COUNTY THIS AFTERNOON. THUNDERSTORM ACTIVITY HAS REMAINED TO THE EAST OF THE CWFA...IN SOUTHEAST UTAH AND NORTH CENTRAL ARIZONA WHERE INSTABILITY IS GREATER. WITH ADDITIONAL DAYTIME HEATING...STILL ANTICIPATE A FEW LIGHTNING STRIKES OVER THE PLATEAU OF NORTHWEST ARIZONA BEFORE THE AFTERNOON IS THROUGH. DUE TO THE DRY LOW LEVELS AND THE EFFECTS FROM EVAPORATIVE COOLING...ANY SHOWER AND PARTICULARLY ANY THUNDERSTORM CAN PRODUCE BRIEF WIND GUSTS OF 40 TO 50 MPH. THE TWO MAIN WEATHER FEATURES CONTINUE TO BE THE UPPER LOW...MOVING ASHORE ALONG THE OREGON COAST AND AN AREA OF HIGH PRESSURE CENTERED OVER THE PANHANDLE OF TEXAS. THE LOW IS RESPONSIBLE FOR ENHANCING WINDS OVER THE SOUTHERN GREAT BASIN AND WIND GUSTS OF 30 TO 40 MPH ARE EXPECTED TO PERSIST OVER ESMERALDA...AND CENTRAL AND SOUTHERN NYE COUNTIES FOR THE REMAINDER OF THE AFTERNOON AND MUCH OF THE EVENING. ONCE THE LOW EJECTS TO THE NORTHEAST LATER MONDAY...THE RIDGE OF HIGH PRESSURE WILL THEN BE ABLE TO GRADUALLY BUILD TO THE WEST. THE ONLY OTHER ITEM OF NOTE IS THE REMNANT LOW FROM FORMER TROPICAL STORM BLANCA. VERY LITTLE REMAINS OF THE SYSTEM...BUT IT MAY PROVIDE JUST ENOUGH MOISTURE AND INSTABILITY TO PRODUCE AN ISOLATED THUNDERSTORM OVER THE SIERRA ON TUESDAY AFTERNOON. TEMPERATURES WILL CONTINUE TO AVERAGE A FEW DEGREES ABOVE NORMAL THROUGH TUESDAY. .LONG TERM...LOOKING CLOSELY AT THE 500 MB VORTICITY FROM THE ECMWF/GFS THERE STILL APPEARS TO BE SOME SORT OF LOBE OF VORTICITY ASSOCIATED WITH THE REMNANTS OF BLANCA ON THURSDAY AFTERNOON BUT BY THEN IT GETS PUSHED NORTHWARD ACROSS CALIFORNIA. A LARGE UPPER RIDGE PRESENTLY OVER TEXAS SHIFTS WEST AND IS FORECAST TO BECOME CENTERED NEAR THE FOUR CORNERS REGION BY THURSDAY AFTERNOON. AS A RESULT HIGH TEMPERATURES ARE EXPECTED TO BE ABOUT 5 DEGREES ABOVE NORMAL ACROSS THE AREA. AS THE PREVIOUS SHIFT POINTED OUT THE ECMWF IS STRONGER WITH THE RIDGE AND BASED ON THE PROGGED 598/599 DM HIGH IT CENTERS NEAR ELY BY THURSDAY AFTERNOON INTO FRIDAY AFTERNOON...MAKING OUR CHANCES FOR REACHING EXCESSIVE HEAT CRITERIA INCREASE. FOR NOW HAVE CONTINUED WITH THE INHERITED NUMBERS DURING THAT TIME FRAME WHICH KEEPS HIGH TEMPERATURES AT 111 IN LAS VEGAS FOR THURSDAY AND FRIDAY. MEANWHILE TO THE SOUTH THERE ARE SIGNS THAT A PUSH OF MOISTURE WILL OCCUR INTO SOUTHERN ARIZONA IN THE THURSDAY TO FRIDAY TIME FRAME IN ASSOCIATION WITH AN EASTERLY WAVE. THERE APPEARS TO BE DECENT CONSENSUS FROM THE ECMWF AND GFS THAT SOME OF THIS MID LEVEL MOISTURE MAY PUSH INTO THE MOJAVE DESERT BY NEXT WEEKEND BUT THIS WILL DEPEND UPON HOW MUCH OF A SOUTHERLY COMPONENT THE FLOW ALOFT HAS. FOR NOW HAVE IN CHANCE TO SLIGHT CHANCE POPS IN THE FRIDAY TO SATURDAY TIME FRAME. TEMPERATURES WILL GRADUALLY LOWER A FEW DEGREES NEXT WEEKEND AS HEIGHTS LOWER ACROSS THE REGION IN RESPONSE TO THE RIDGE WEAKENING SLIGHTLY DUE TO A SYSTEM MOVING TOWARD THE PAC NW. && .AVIATION...FOR MCCARRAN...GUSTY SOUTH WINDS TO AROUND 20 KTS SHOULD LAST THROUGH 03Z MONDAY...THEN LET UP OVERNIGHT AND BECOME SUSTAINED AT 6-8 KTS. WINDS WILL INCREASE OUT OF THE SOUTH AROUND 20Z MONDAY ONCE AGAIN WITH GUSTS OF 15-20 KTS. FEW-SCT CLOUDS AOA 14K FEET THROUGH MONDAY EVENING. FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST CALIFORNIA...GUSTY SOUTH WINDS OF 15-25 KTS SHOULD WIND DOWN BETWEEN 03Z AND 07Z TONIGHT. WINDS WILL FOLLOW DIURNAL TRENDS AT TIMES TONIGHT AS THE SURFACE PRESSURE GRADIENT WEAKENS. ONCE AGAIN WINDS ARE EXPECTED TO INCREASE OUT OF THE SOUTH ACROSS THE AREA BETWEEN 18Z AND 20Z AND GUST TO 15-20 KTS. FEW-SCT CLOUDS AT TIMES AOA 14K FEET THROUGH MONDAY AFTERNOON. && .FIRE WEATHER...AN AREA OF LOW PRESSURE WILL CONTINUE TO MOVE ACROSS OREGON THIS EVENING. GUSTY SOUTHWEST WINDS WILL PERSIST INTO THE EARLY EVENING. THE STRONGEST WINDS ARE EXPECTED ACROSS ESMERALDA AND CENTRAL NYE COUNTIES...ESPECIALLY IN THE HIGHER ELEVATIONS. SUSTAINED WINDS OF 20 MPH WITH GUSTS GREATER THAN 35 MPH AND RELATIVE HUMIDITY VALUES LESS THAN 15 PERCENT WILL OCCUR. A RED FLAG WARNING REMAINS IN EFFECT FOR NEVADA FIRE ZONES 460 AND 462 UNTIL 9 PM THIS EVENING. && .VEF WATCHES/WARNINGS/ADVISORIES... NV...RED FLAG WARNING IN EFFECT THROUGH 9 PM PDT THIS EVENING FOR NVZ460-462. AZ...NONE. CA...NONE. && CZYZYK/STACHELSKI HTTP://WEATHER.GOV/LASVEGAS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAS VEGAS NV 649 AM PDT SUN JUL 12 2009 AZZ001>003-036-CAZ519>527-NVZ015-016-018>022-130700- NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS- LAKE MEAD NATIONAL RECREATION AREA-EASTERN SIERRA SLOPES- OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY- DEATH VALLEY NATIONAL PARK-WESTERN MOJAVE DESERT- EASTERN MOJAVE DESERT-MORONGO BASIN-CADIZ BASIN- SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-LINCOLN COUNTY- NORTHEAST CLARK COUNTY-SHEEP RANGE-SPRING MOUNTAINS- LAS VEGAS VALLEY-SOUTHERN CLARK COUNTY- 649 AM PDT SUN JUL 12 2009 /649 AM MST SUN JUL 12 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST ARIZONA...CALIFORNIA AND SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT THERE IS NO HAZARDOUS WEATHER EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A STRONG AREA OF HIGH PRESSURE WILL BE ACROSS ARIZONA AND THE MOJAVE DESERT LATE THIS WEEK. ON THURSDAY AND FRIDAY...HIGH TEMPERATURES WILL BE THE HOTTEST FELT SO FAR THIS SUMMER. AN EXCESSIVE HEAT WARNING MAY BE NEEDED AS THE HIGH TEMPERATURE IN LAS VEGAS FLIRTS WITH THE CRITERIA OF 112 DEGREES. .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. NVZ014-017-130700- ESMERALDA AND CENTRAL NYE COUNTY- WESTERN CLARK AND SOUTHERN NYE COUNTY- 649 AM PDT SUN JUL 12 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT INCREASING WINDS AND FALLING RELATIVE HUMIDITY THIS AFTERNOON WILL LEAD TO POTENTIALLY DANGEROUS FIRE BEHAVIOR. WIND GUSTS AT OR GREATER THAN 35 MPH AND RELATIVE VALUES LESS THAN 15 PERCENT WILL OCCUR IN PORTIONS OF ESMERALDA AND NYE COUNTIES BETWEEN 1 AND 9 PM THIS EVENING. A RED FLAG WARNING HAS BEEN ISSUED. THE WIND WILL DECREASE AND HUMIDITY VALUES WILL BEGIN TO RECOVER BY LATE EVENING. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A STRONG AREA OF HIGH PRESSURE WILL BE ACROSS ARIZONA AND THE MOJAVE DESERT LATE THIS WEEK. ON THURSDAY AND FRIDAY...HIGH TEMPERATURES WILL BE THE HOTTEST FELT SO FAR THIS SUMMER. AN EXCESSIVE HEAT WARNING MAY BE NEEDED AS THE HIGH TEMPERATURE IN LAS VEGAS FLIRTS WITH THE CRITERIA OF 112 DEGREES. .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. Local standard time, as filed.
A dissipating shower produced this wind gust, which blew down some tree branches at Pipe Spring National Monument.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2009Every state in 2009This day in weather historyWarnings in Arizona, July 2009
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: 175834.