Runoff from heavy rain caused several road closures in Williams.
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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 FGZ wrote it up.
Runoff from heavy rain caused several road closures in Williams.
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 Flagstaff, AZ wrote its last area forecast discussion before the first event at Aug 1, 9:20 AM MST, 5 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 920 AM MST WED AUG 1 2007 .SYNOPSIS...A MOIST AND UNSTABLE AIRMASS WILL REMAIN OVER THE AREA THROUGH AT LEAST SUNDAY. EXPECT AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS...SOME PRODUCING HEAVY RAIN...ACROSS NORTHERN ARIZONA THROUGH THE WEEK AND INTO THE WEEKEND. && .DISCUSSION...DEBRIS CLOUDS WIDESPREAD OVER THE AREA WHICH WILL REDUCE THE COVERAGE OF MORNING DEVELOPMENT ESPECIALLY WEST PORTIONS OF THE FORECAST AREA. MORNING KFGZ SOUNDING HAS SLIGHTLY LESS INSTABILITY ALONG WITH A WEAK CAP AT 400-460 MB. MODELS SUGGEST SLIGHTLY STRONGER STEERING FLOW TODAY FROM 10-15 KT FROM THE SOUTHEAST AND EAST...WHICH WITH LESS CAPE TO WORK WITH MEAN THE STORMS TODAY SHOULD BE SOMEWHAT LESS VIGOROUS. HOWEVER...PW VALUES STILL WELL OVER CLIMO AT AROUND 120%...WHICH MEANS THE STORMS WILL STILL BE HEAVY RAIN PRODUCERS. EXPECT CONVECTION TODAY TO GENERATE MORE RANDOMLY IN THE HOLES IN THE CLOUD COVER...PRIMARILY OVER CENTRAL AND EASTERN PORTIONS FIRST...AND THEN THROUGHOUT THE FORECAST AREA AFTER 11 AM. STORMS WILL GENERALLY MOVE TOWARD THE NORTHWEST TODAY WHICH USUALLY WILL FOCUS ACTIVITY FROM THE WHITES INTO THE LCR AND EASTERN RIM...AND FROM THE WESTERN MOGOLLON RIM ONTO THE COCONINO PLATEAU. ACTIVITY FROM THE CHUSKAS AND BLACK MESA SHOULD SPREAD INTO THE LOWER DESERT REGIONS DURING THE LATER AFTERNOON HOURS AS WELL. FOR THURSDAY AND FRIDAY...PW VALUES REMAIN ABOVE CLIMO AND STEERING FLOW WEAKENS A BIT MORE WITH SLIGHTLY HIGHER INSTABILITY VALUES...THUS THE LIKELIHOOD FOR MORE VIGOROUS THUNDERSTORM ACTIVITY WITH SMALL HAIL AND HEAVIER RAINFALL POTENTIAL WILL EXIST. .PREVIOUS DISCUSSION FROM 323 AM...THIS MORNING WE HAVE SOME ISOLATED STORMS STILL GOING ON OVER THE KAIBAB PLATEAU. ELSEWHERE...THE DEBRIS CLOUDS ARE STARTING TO THIN. FOR TODAY...HIGH PRESSURE WILL REMAIN OVER NORTHWEST COLORADO. THIS PUTS NRN AZ IN EAST TO SOUTHEAST FLOW. WE EXPECT TODAYS CONVECTION TO FIRE SIMILARLY TO YESTERDAYS...STARTING OVER THE HIGHEST TERRAIN AFT 17Z AND WORKING ITS WAY TO THE LOWER ELEVATIONS. WE HAVE RAISED POPS A FEW POINTS PER YESTERDAYS RADAR STORM TOTAL QPF WITH GOOD COVERAGE. TONIGHT THROUGH SUNDAY...PROGS KEEP NRN AZ IN THE MONSOON MOISTURE...WITH NO SIGNIFICANT CHANGE IN THETA E AND INSTABILITY SEEN. SO WILL KEEP THE CHANCE OF AFTERNOON AND EVENING STORMS GOING. MONDAY AND TUESDAY...GFS IS SHOWING A TROF OF LOW PRESSURE MOVING INTO THE WEST COAST. PROGS SHOW SOME DRIER ARE MOVING INTO WESTERN AZ MONDAY AND TO THE NAVAJO COCONINO COUNTY LINE TUESDAY. WE HAVE REDUCED THE CHANCE OF STORMS IN WESTERN AZ FOR EARLY NEXT WEEK. && .AVIATION...FOR THE 18Z PACKAGE...SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE TODAY WITH AREAS OF CEILINGS 4-7 KFT AGL. STORM MOTION WILL BE GENERALLY TO THE WEST NORTHWEST. STORM ACTIVITY SHOULD DECREASE AFTER 03Z. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && STAUDENMAIER/BOHLIN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1000 AM MST WED AUG 1 2007 AZZ004>018-037>040-020700- WESTERN MOGOLLON RIM-GRAND CANYON COUNTRY-YAVAPAI COUNTY MOUNTAINS- YAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONS- MARBLE AND GLEN CANYONS-KAIBAB PLATEAU-COCONINO PLATEAU- NORTHEAST PLATEAU AND MESAS HWY 264 NORTHWARD- NORTHEAST PLATEAU AND MESAS SOUTH OF HWY 264- CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- BLACK MESA AREA-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- EASTERN MOGOLLON RIM-WHITE MOUNTAINS-NORTHERN GILA COUNTY- 1000 AM MST WED AUG 1 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY DEEP MOISTURE AND AN UNSTABLE AIR MASS CONTINUE TO RESIDE OVER NORTHERN ARIZONA TODAY. ABUNDANT CLOUD DEBRIS FROM PREVIOUS THUNDERSTORM ACTIVITY WILL REDUCE MORNING COVERAGE OF THUNDERSTORMS ...BUT THIS CLOUD COVER SHOULD DIMINISH DURING THE LATE MORNING AND EARLY AFTERNOON HOURS ALLOWING FOR SCATTERED TO NUMEROUS THUNDERSTORMS OVER THE NORTHLAND. STORMS SHOULD MOVE MORE QUICKLY TOWARD THE NORTHWEST AND WEST TODAY AT AROUND 10 TO 15 MPH WHICH WILL REDUCE SIGNIFICANT FLASH FLOOD THREAT. HOWEVER...BECAUSE MANY LOCATIONS ALREADY HAVE SATURATED SOILS...THERE WILL STILL BE ISOLATED AREAS WITH FLOODING POTENTIAL THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SCATTERED MAINLY AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED THROUGH THE PERIOD. SOME OF THE STORMS WILL PRODUCE LOCALLY HEAVY RAINFALL AND SMALL HAIL. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. STAUDENMAIER
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Several streets were closed in Williams due to water in streets from heavy rain.
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: 55122.