Heavy rain from a thunderstorm caused extensive flooding to parts of the Northern Arizona University Campus.
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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.
Heavy rain from a thunderstorm caused extensive flooding to parts of the Northern Arizona University Campus.
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 13, 10:00 AM MST, 3 hours 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1000 AM MST MON AUG 13 2007 .SYNOPSIS...SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED TO DEVELOP TODAY AND FOR THE NEXT SEVERAL DAYS AS MOISTURE WILL BE IN ABUNDANCE ACROSS NORTHERN ARIZONA. && .DISCUSSION...A MOIST AND VERY UNSTABLE SOUTHEAST FLOW IS IN PLACE TODAY ACROSS NORTHERN ARIZONA. THE BEST LOCATIONS FOR STORMS TODAY WILL BE THE NORTHEAST PLATEAUS/CHUSKA MOUNTAINS...WHITE MOUNTAINS RUNNING NORTHWEST ALONG THE MOGOLLON RIM AND UP INTO THE KAIBAB PLATEAU TODAY. BOTH THE GFS AND THE NAM DEVELOP A MESO-HIGH GENERATED BY TSRA OVER PORTIONS OF WESTERN COCONINO COUNTY AND YAVAPAI COUNTY. THERE IS ALSO 25 TO 35 KNOTS OF FLOW OVER COCONINO AND YAVAPAI COUNTIES AT STORM TOP LEVEL WHICH WILL MOSTLY LIKELY HELP A FEW STORMS THAT TAP INTO GOOD CAPE DISPERSE THE MASS AND HAVE FAIRLY EFFICIENT UPDRAFTS. THE MAIN WEATHER THREAT TODAY WILL BE ISOLATED HAIL FROM THE STRONGER STORMS MAINLY OVER YAVAPAI AND COCONINO COUNTIES. THE OTHER CONCERN WILL BE ISOLATED HEAVY RAIN THREAT ALONG THE PERIPHERY OF THE MESO-HIGH/OUT FLOW BOUNDARY PROPAGATING WEST AND SOUTH INTO PORTIONS OF THE COCONINO PLATEAU AREA WEST OF WILLIAMS AND PORTIONS OF YAVAPAI COUNTY ALONG THE VERDE VALLEY NORTHWARD TOWARD ASH FORK. GRIDS HAVE BEEN UPDATED TO INCREASE PRECIP CHCS...ZONE FORECASTS WILL BE UPDATED SHORTLY. && .AVIATION...FOR THE 18Z PACKAGE...THIS AFTERNOON...EXPECT SCT-BKN CU/TCU WITH BASES NEAR 7-9 KFT AGL...WITH SCT TSRA/-SHRA. STORM MOTION WILL BE FROM SOUTH TO NORTH...WITH WDLY SCT MVFR CONDITIONS UNDER THE HEAVIER STORMS. SKIES WILL CLEAR AGAIN AFTER SUNSET THIS EVENING. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && TC/DL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST MON AUG 13 2007 AZZ004>018-037>040-140700- 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- 930 AM MST MON AUG 13 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY A MOIST AND VERY UNSTABLE ATMOSPHERE WILL BE OVER NORTHERN ARIZONA TODAY WITH THE FLOW ALOFT MOVING ALONG THE HIGH TERRAIN FROM THE WHITE MOUNTAINS...ACROSS THE MOGOLLON RIM...AND UP INTO THE KAIBAB PLATEAU. THIS WILL TEND TO PUSH STORMS TO THE NORTHWEST LATER TODAY. THE MAIN WEATHER THREAT TODAY WILL BE ISOLD HAIL REPORTS FROM THE STRONGER STORMS...POSSIBLE HAIL SIZES MAY RANGE FROM A HALF INCH TO ONE INCH IN DIAMETER...MAINLY FOR PORTIONS OF SOUTHERN COCONINO COUNTY...YAVAPAI COUNTY AND NORTHERN GILA COUNTY. THERE IS ALSO AN ISOLATED HEAVY RAIN THREAT OVER PORTIONS OF WESTERN COCONINO COUNTY SOUTH OF THE COLORADO RIVER...PORTIONS OF YAVAPAI COUNTY AND NORTHERN GILA COUNTY. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A MOIST AND UNSTABLE AIR MASS WILL BRING DAILY SHOWERS AND THUNDERSTORMS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Flagstaff radar (KFSX), 81 km away, was scanning. The volume nearest the first event began at 20:39 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain caused flooding across the southeast parts of the Northern Arizona University. Water entered several buildings and flooded parking lots with close to three feet of water. An electric substation was flooded and caused a power outage.
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: 58342.