A thunderstorm with some rotation near Sierra Vista produced a funnel cloud.
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The episode as NWS TWC wrote it up.
A thunderstorm with some rotation near Sierra Vista produced a funnel cloud.
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 Tucson, AZ wrote its last area forecast discussion before the first event at Aug 3, 12:02 PM MST, 1 hour 43 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE TUCSON AZ 1202 PM MST FRI AUG 3 2007 .SYNOPSIS...UPPER LEVEL HIGH PRESSURE OVER NORTHERN NEW MEXICO WILL STEER A DISTURBANCE WEST FROM THE SOUTHERN PLAINS INTO MEXICO AND SOUTHERN ARIZONA BY THIS WEEKEND. WITH EXCESSIVE MONSOON MOISTURE REMAINING IN PLACE...THIS DISTURBANCE IS LIKELY TO ENHANCE THUNDERSTORM DEVELOPMENT AND MAY RESULT IN LOCALLY HEAVY RAIN. A LOW PRESSURE TROUGH DEEPENING ALONG THE WEST COAST IS THEN EXPECTED TO MOVE INLAND EARLY NEXT WEEK. AS IT DOES SO...SOUTHWEST FLOW AHEAD OF IT WILL PUSH MUCH OF THE DEEPER MOISTURE OUT OF THE REGION AND RESULT IN A DECREASE IN THUNDERSTORMS. && .UPDATE...HAVE UPDATED ZONES/GRIDS FOR ONGOING TRENDS. VERY WARM TEMPS ALOFT AND PLENTY OF SUNSHINE HAVE SENT TEMPS ZOOMING FROM KTUS WEST. TSTMS ARE DEVELOPING ON THE MOUNTAINS...BUT AS SOON AS THEY TRY TO PUSH IN THE VALLEYS THEY FALL APART. SO EXPECTING A LATER START TO THE ACTIVITY OVER THE CENTRAL/W DESERTS AND NOT AS MUCH AREAL COVERAGE. ONE CONCERN THAT MAY FACTOR INTO THE EVENING FORECAST...IS THAT WE ARE GOING TO END UP QUITE A BIT WARMER THAN PREVIOUSLY PLANNED. IT REMAINS TO BE SEEN IF THIS WILL RESULT IN SUFFICIENT VALLEY/DESERT CAPE THIS EVENING AS THE NE FLOW INCREASES A BIT OR NOT. IF IT LOOKS LIKE THAT MAY HAPPEN...RAIN PRODUCTION WILL BE VERY EFFICIENT WITH SUCH A HIGH FREEZING LEVEL...WITH RATES EASILY UP TO 2 INCHES PER HOUR. && .AVIATION...THE STRONGEST THUNDERSTORMS TODAY WILL BE IN NORTHERN SONORA MEXICO WITH SCATTERED ORGANIZED ACTIVITY EXTENDING INTO SOUTHERN ARIZONA. DUE TO THE SATURATED AIRMASS...ALL THUNDERSTORMS WILL HAVE HIGH RAINFALL RATES WHICH IN TURN WILL DROP CEILINGS AND VISIBILITIES TO THE UPPER RANGE OF IFR CONDITIONS WHEN OVER AN AIRPORT. THESE CONDITIONS SUPPORTING THUNDERSTORM DEVELOPMENT ARE EXPECTED TO EXTEND THROUGH THE EVENING HOURS AND INTO SATURDAY. AVIATION DISCUSSION NOT UPDATED FOR TAF AND TWEB AMENDMENTS. && .PREV DISCUSSION...TOUGH FORECAST CALL OVER THE NEXT 12-18HRS AS WARM CORE LOW MOVES TOWARD SE AZ/N SONORA. OUR MID LEVELS THIS MORNING ARE ABOUT AS WARM ALOFT AS WE GET AROUND HERE WITH 12Z 500MB TEMPS AT -3C AND OUR FREEZING LEVEL AT A WHOPPING 17KFT. SUCH WARM TEMPS ALOFT WOULD NORMALLY MEAN A CONVECTIVE SHUTDOWN. BUT NOT TODAY. MODIFYING FOR EXPECTED HIGH TEMPS AND A BOUNDARY LAYER MIXING RATIO OF 16 G/KG STILL GIVES US ABOUT 1500J/KG OF MLCAPE TO WORK WITH. THE LOW CENTER JUST SE OF KELP THIS MORNING HAS SEVERAL VORT SPOKES ROTATING AROUND IT...WITH ONE EXTENDING FROM KFLG INTO W PIMA COUNTY...AND ANOTHER ALREADY FIRING WARM-TOPPED CONVECTION OVER E COCHISE COUNTY. CURRENT MOVEMENT WILL TAKE IT ACROSS THE SE 1/2 OF THAT COUNTY THIS MORNING...SO HAVE UPDATED JUST THAT SEGMENT OF THE CWA. WITH SUCH A HIGH FREEZING LEVEL...RAINFALL WILL BE VERY EFFICIENT SO WILL MONITOR THIS CLUSTER CLOSELY FOR FLASH FLOOD POTENTIAL. PARADISE COOP /NE SIDE OF THE CHIRICAHUAS/ CAME IN WITH 1.26 INCHES OF RAIN THIS MORNING...BUT SOME OF THAT MAY HAVE FALLEN THU EVENING. THE REST OF TODAY AND ESPECIALLY TONIGHT IS A DIFFICULT CALL...WITH SEVERAL POTENTIAL SCENARIOS. THE MODELS ARE LITTERED WITH REAL AND SPURIOUS CONVECTIVE VORTICES...AND ARE OCCASIONALLY CONFUSING THEM WITH THE PARENT LOW CENTER. SO I DO NOT TRUST ANY ONE SOLUTION AT THE MOMENT. HOWEVER THEY ALL INCREASE OUR FLOW FROM THE NE AND INDUCE ABOUT 20KTS OF MID LEVEL SHEAR BY 00Z. THAT WOULD BE MORE THAN ENOUGH TO ORGANIZE TSTMS AND LEAD TO A SIGNIFICANT FLASH FLOOD THREAT WITH ANY VORT SPOKE THAT ROTATES INTO OUR CWA. ALSO...CURRENT MOVEMENT OF THE CENTER WOULD PUT IT INTO FAR SE AZ BY MORNING WHICH WOULD TEND TO SUPPORT RATHER WIDESPREAD WARM-TOPPED CONVECTION OVERNIGHT. ON THE OTHER HAND...MID LEVEL TEMPS ARE FORECAST TO WARM EVEN MORE THROUGH TONIGHT WHICH WOULD MAKE MAINTAINING CONVECTION OUTSIDE OF ANY STRONG FORCING MECHANISMS VERY DIFFICULT. AS IS TYPICAL FOR WARM CORE SYSTEMS LIKE THIS...TSTMS CONCENTRATED NEAR THE CORE LAST NIGHT...BUT THEY CONCENTRATED S OF THE CENTER. IF THAT HAPPENS AGAIN TONIGHT...THE CWA WILL BE MERELY GRAZED BY THE STRONGEST TSTMS AS NE FLOW TAKES ANYTHING THAT DEVELOPS NEAR THE FRONTERA SW AWAY FROM US. FINALLY...THE INCOMING W COAST TROUGH WILL BRING A 70KT UPPER JET INTO N NV AND EVENTUALLY INCREASE UPPER LEVEL DIVERGENCE OVER OUR CWA. BUT THAT MAY NOT HAPPEN UNTIL SAT AFTERNOON/EVENING AT THE EARLIEST. INCLINATION FOR NOW IS TO LET THE REST OF THE FORECAST RIDE AS-IS AND CONTINUE TO MONITOR CLOSELY. LATEST MEDIUM RANGE MODELS CONTINUE TO SUPPORT A TEMPORARY BUT SIGNIFICANT DRYING TREND IN THE TUE-THU PERIOD. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...PYTLAK AVIATION...SAMPSON WEATHER.GOV/TUCSON
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 640 AM MST FRI AUG 3 2007 AZZ019-030-035-041400- NORTHERN GREENLEE COUNTY-UPPER GILA RIVER VALLEY-COCHISE COUNTY- 640 AM MST FRI AUG 3 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST ARIZONA. .DAY ONE...TODAY AND TONIGHT. THE AIRMASS OVER SOUTHEAST ARIZONA CONTINUES TO BE MOIST AND UNSTABLE. THIS MORNINGS SOUNDING INDICATES THAT STEERING FLOW WILL BE RATHER WEAK. SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL DEVELOP TODAY AND WILL MAINLY DRIFT TO THE SOUTH. AS A RESULT...THE MAIN CONCERN WITH THE STORMS THAT DEVELOP WILL BE FLOODING PROBLEMS. ANY RAINFALL THAT OCCURS WILL AFFECT ALREADY SATURATED SOILS...AND RISES IN STREAMS AND WASHES WILL LIKELY INCREASE DEPENDING ON THE EXACT LOCATION IN WHICH THE STORMS DEVELOP. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. EXPECT A SLIGHT INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY ON SATURDAY AS AN UPPER LEVEL DISTURBANCE MOVES WESTWARD ACROSS MEXICO WITH THE NORTHERN FRINGES OF THE SYSTEM IMPACTING SOUTHERN ARIZONA. THIS SYSTEM WILL LIKELY ENHANCE THE SHOWERS AND STORMS THAT DEVELOP WITH FLOODING ONCE AGAIN BEING THE PRIMARY CONCERN. HOWEVER...AS WITH ANY THUNDERSTORM THIS TIME OF YEAR...STRONG GUSTY WINDS AND DANGEROUS LIGHTNING WILL ALSO OCCUR. A PACIFIC TROUGH WILL APPROACH THE REGION EARLY NEXT WEEK...AND AS A RESULT IT WILL PUSH MOISTURE TO THE EAST WHICH WILL DECREASE OUR RAIN CHANCES THROUGH THE WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ029-031>034-041400- SOUTHEAST PINAL COUNTY-WESTERN PIMA COUNTY-TOHONO OODHAM NATION- TUCSON METRO/MARANA/GREEN VALLEY-SANTA CRUZ COUNTY- 640 AM MST FRI AUG 3 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARIZONA AND SOUTHEAST ARIZONA. .DAY ONE...TODAY AND TONIGHT. THE AIRMASS OVER SOUTHEAST ARIZONA CONTINUES TO BE MOIST AND UNSTABLE. THIS MORNINGS SOUNDING INDICATES THAT STEERING FLOW WILL BE RATHER WEAK. ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP TODAY AND WILL MAINLY DRIFT TO THE SOUTH. AS A RESULT...THE MAIN CONCERN WITH THE STORMS THAT DEVELOP WILL BE FLOODING PROBLEMS. ANY RAINFALL THAT OCCURS WILL AFFECT ALREADY SATURATED SOILS...AND RISES IN STREAMS AND WASHES WILL LIKELY INCREASE DEPENDING ON THE EXACT LOCATION IN WHICH THE STORMS DEVELOP. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. EXPECT A SLIGHT INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY ON SATURDAY AS AN UPPER LEVEL DISTURBANCE MOVES WESTWARD ACROSS MEXICO WITH THE NORTHERN FRINGES OF THE SYSTEM IMPACTING SOUTHERN ARIZONA. THIS SYSTEM WILL LIKELY ENHANCE THE SHOWERS AND STORMS THAT DEVELOP WITH FLOODING ONCE AGAIN BEING THE PRIMARY CONCERN. HOWEVER...AS WITH ANY THUNDERSTORM THIS TIME OF YEAR...STRONG GUSTY WINDS AND DANGEROUS LIGHTNING WILL ALSO OCCUR. A PACIFIC TROUGH WILL APPROACH THE REGION EARLY NEXT WEEK...AND AS A RESULT IT WILL PUSH MOISTURE TO THE EAST WHICH WILL DECREASE OUR RAIN CHANCES THROUGH THE WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Tucson radar (KEMX), 47 km away, was scanning. The volume nearest the first event began at 20:45 UTC.
1 funnel cloud. Local standard time, as filed.
Numerous reports of a funnel cloud occurred near the Huachuca Mountains just west of Sierra Vista.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2007Every state in 2007This day in weather historyWarnings in Arizona, August 2007
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: 51107.