Thunderstorms with heavy rain Cataract and Supai Canyons causing flash flooding.
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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.
Thunderstorms with heavy rain Cataract and Supai Canyons causing flash flooding.
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 Sep 9, 9:40 AM MST, 5 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 940 AM MST MON SEP 9 2013 .SYNOPSIS...A WET AND STORMY PATTERN WILL AFFECT NORTHERN ARIZONA THROUGH WEDNESDAY. A SLOW DRYING AND WARMING TREND WILL BEGIN THURSDAY ACROSS WESTERN ARIZONA AND MOVE EASTWARD THROUGH THE WEEKEND. && .DISCUSSION...WATER VAPOR SATELLITE IMAGERY THIS MORNING SHOWS AN UPPER LEVEL LOW STRADDLING THE CALIFORNIA ARIZONA BORDER. MODELS ARE CONSISTENT IN SHOWING THIS LOW SLOWLY MOVING NORTHWARD INTO UTAH BY WEDNESDAY AFTERNOON. THIS MEANS WE WILL CONTINUE TO SEE WIDESPREAD RAINFALL THROUGH AT LEAST TUESDAY WITH DEEP MOISTURE AND WEAK TO MODERATE UPPER LEVEL FORCING. WHILE THERE IS DECENT WIND SHEAR ALOFT FOR SOME ORGANIZED CONVECTION...THE THERMAL PROFILE ON THE MODEL SOUNDINGS ARE MOIST ADIABATIC INDICATING LOWER LEVELS OF INSTABILITY. FOR TODAY WE EXPECT TO SEE WIDESPREAD RAIN SHOWERS WITH EMBEDDED THUNDERSTORMS LASTING THROUGH THE OVERNIGHT HOURS. THE MAIN THREATS FOR THE NEXT TWO DAYS WILL BE FROM LIGHTNING AND LOCALIZED FLASH FLOODING. THE WEATHER SERVICE DOPPLER RADAR IS SHOWING WIDESPREAD RAINFALL THIS MORNING FROM YAVAPAI EASTWARD TO NAVAJO COUNTY. EXPECT THESE SHOWERS HEAVY AT TIMES TO SPREAD OUT COVERING ALL AREAS OF NORTHERN ARIZONA BY THIS AFTERNOON. MORNING GRIDS LOOK GOOD. NO UPDATES. && .PREVIOUS DISCUSSION...FOR TODAY THROUGH TUESDAY...DEEP SOUTHERLY FLOW ALOFT WILL CONTINUE OVER NORTHERN ARIZONA AND WIDESPREAD PRECIPITATION IS LIKELY. THIS FLOW WILL KEEP THE MONSOON PLUME ACROSS THE AREA...WITH THE HIGHEST MOISTURE VALUES ACROSS APACHE AND NAVAJO COUNTIES. THE UPPER LOW THAT IS CURRENTLY OVER WESTERN AZ SHOULD REMAIN THERE THROUGH TUESDAY AS WELL. THE GFS DOES SHOW INCREASING WIND SHEAR TONIGHT AS A JET MAX MOVES NORTHWARD ACROSS OUR STATE AND THIS MAY AID STORM DEVELOPMENT. PRECIP CHANCES TONIGHT ARE 50% PLUS ACROSS THE NORTHLAND. AT THIS TIME FEEL THAT PRECIPITATION TYPES THROUGH THIS AFTERNOON WILL BE STEADY STRATIFORM WITH EMBEDDED TSTORMS ACROSS NAVAJO AND APACHE COUNTIES AND MORE CONVECTIVE ACROSS WESTERN AZ. AS FAR AS A FLASH FLOOD WATCH GOES...MY CONFIDENCE THAT WIDESPREAD AND SIGNIFICANT FLOODING IS NOT HIGH ENOUGH TO ISSUE A WATCH. STARTING WEDNESDAY...PROGS ARE SLOWLY MOVING THE UPPER LOW CENTER INTO SRN UTAH WITH MOISTURE DECREASING ALOFT ACROSS WESTERN AZ. DRIER MORE STABLE AIR IS SHOWN ACROSS YAVAPAI AND COCONINO COUNTIES THURSDAY AND THIS AIRMASS SPREADS EASTWARD THROUGH SATURDAY. HAVE AGAIN MASSAGE POP FORECASTS WITH THE HIGHEST CHANCES IN THE EAST THROUGH THURSDAY. CANT RULE OUT A STRAY STORM OR TWO FOR FRIDAY THROUGH SUNDAY (ESPECIALLY EAST) AND LEFT A SLIGHT CHANCE OF STORMS IN FOR NOW. && .AVIATION....FOR THE 18Z PACKAGE...WIDESPREAD SHRA WITH EMBEDDED +TSRA WILL AFFECT NORTHERN AZ THROUGH THIS AFTERNOON. SHRA/TSRA COVERAGE WILL INITIALLY FAVOR A CORRIDOR OF NORTH-CENTRAL AZ...BUT COVERAGE SHOULD INCREASE AREA-WIDE THIS AFTERNOON INTO THIS EVENING. MOST AREAS WILL SEE MVFR CIGS WITH PERIODIC IFR CONDITIONS IN HEAVIER SHOWERS. MORE SCATTERED COVERAGE WILL BECOME LIKELY AFT 06Z TUES. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC.....BOHLIN/DL AVIATION...MCS FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 400 AM MST MON SEP 9 2013 AZZ004>018-037>040-100700- KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRY- COCONINO PLATEAU-YAVAPAI COUNTY MOUNTAINS- NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEY- CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- WESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINS- NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINS- OAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREA- NORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264- 400 AM MST MON SEP 9 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO... NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY AND TONIGHT NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY AND TONIGHT ACROSS NORTHERN ARIZONA. SOME STORMS MAY PRODUCE HEAVY RAINFALL AND LOCAL FLASH FLOODING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SATURDAY DEEP MOISTURE WILL PERSIST ACROSS THE REGION THROUGH TUESDAY...WITH SHOWERS AND THUNDERSTORMS LIKELY. SOME STORM MAY PRODUCE HEAVY RAIN AND LOCAL FLASH FLOODING. WEDNESDAY SHOULD START GRADUAL DECREASE IN MOISTURE AND PRECIPITATION COVERAGE ACROSS WESTERN ARIZONA AND THIS WILL SPREAD EASTWARD THROUGH THE END OF THE WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Cedar City radar (KICX), 160 km away, was scanning. The volume nearest the first event began at 21:48 UTC.
1 flash flood. Local standard time, as filed.
A three foot rise on Havasu Creek was reported at 253 PM. Later, at just after 400 PM, Supai Police reported that trails had been flooded and washed out. One bridge was flooded and parts of the Village of Supai were flooded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2013Every state in 2013This day in weather historyWarnings in Arizona, September 2013
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: 479265.