1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 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 15, 2:30 PM MST, 3 hours 40 minutes earlier.
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST FRI AUG 15 2003
.SYNOPSIS...A WEATHER DISTURBANCE WILL CONTINUE TO BRING WIDESPREAD
SHOWER AND THUNDERSTORM ACTIVITY TO THE REGION THROUGH SATURDAY. THE
WEATHER SYSTEM WILL WEAKEN BY SUNDAY BUT ENOUGH MOISTURE WILL REMAIN
FOR A CHANCE OF SHOWERS AND THUNDERSTORMS INTO NEXT WEEK.
.DISCUSSION...UPPER TROUGH WAS CENTERED OVER THE ARIZONA/NEW MEXICO
BORDER THIS AFTERNOON. THE TROUGH WILL MOVE SLOWLY TO THE NORTHWEST
OVERNIGHT KEEPING MUCH OF NORTHERN ARIZONA UNDER A NORTHEAST FLOW.
OVER NORTHEAST ARIZONA SOME DRY AIR HAS ADVECTED IN FROM COLORADO
AND NEW MEXICO AND SEEMS TO BEE PUTTING A LIMIT ON STORM ACTIVITY
FROM THE MOGOLLON RIM NORTHWARD. ALONG...SOUTH AND WEST OF THE
MOGOLLON RIM DEEPER MOISTURE STILL REMAINS AND STORMS THAT FORM ON
THE RIM STILL MAY MOVE SOUTHWEST INTO THIS DEEPER MOISTURE. AS A
RESULT...A FLASH FLOOD WATCH IS IN EFFECT UNTIL MIDNIGHT TONIGHT FOR
PORTIONS OF YAVAPAI...GILA AND COCONINO COUNTIES. FOR SATURDAY AND
SUNDAY THE UPPER LOW PARKS RIGHT OVER ARIZONA WITH A
DEEP...MOIST...COOL AIR MASS. EXPECT ROUNDS OF ISOLATED TO SCATTERED
THUNDERSTORMS EACH DAY WITH A MORE NORMAL DIURNAL TREND IN
PRECIPITATION.
IN THE EXTENDED...NOT CLEAR WHAT THE FLOW PATTERN WILL BE FOR MONDAY
AND INTO THE MIDDLE OF NEXT WEAK. FAIRLY CERTAIN ARIZONA WILL AVOID
A SIGNIFICANT DRY PUNCH FROM THE EASTERN PACIFIC. THE GFS IS SHOWING
VERY LITTLE DRYING THROUGH THE MIDDLE OF NEXT WEEK AND THINK THIS IS
REASONABLE. WILL GO WITH A STANDARD MONSOON FORECAST FOR THE
EXTENDED WITH A CHANCE OF SHOWERS AND THUNDERSTORMS EACH DAY.
.FGZ...FLASH FLOOD WATCH UNTIL MIDNIGHT FOR ZONES
004>009-012-015-016-018-037-038
.CODED TEMPERATURES/POPS FOR SELECTED CITIES IN NORTHERN ARIZONA
CITY TEMPERATURES LO/HI PROBABILITY OF PRECIP
TON SAT SUN MON TON SAT SUN MON
FLAGSTAFF 048/072 048/075 048/077 060 050 030 040 040 040
WINSLOW 058/085 059/087 058/089 050 040 020 030 020 030
PRESCOTT 058/080 058/086 059/087 060 050 020 040 020 040
PAGE 069/088 065/087 065/090 050 040 020 040 020 040
WINDOW ROCK 049/077 047/077 049/081 050 050 030 040 040 040
CANYON DE CHELLY 057/083 055/083 057/087 040 040 020 040 030 040
COTTONWOOD 066/091 066/097 067/098 050 050 020 040 020 040
GRAND CANYON 048/073 048/076 048/078 060 050 020 040 030 040
GREER 045/067 045/070 045/072 060 060 040 050 050 050
HEBER 050/077 050/080 050/082 060 050 030 040 040 040
JACOB LAKE 048/070 048/073 048/075 060 050 030 040 040 040
NAVAJO N.M. 054/077 052/077 054/081 050 040 030 040 040 040
PAYSON 059/084 059/090 060/091 050 040 030 040 020 040
SEDONA 064/088 064/094 065/095 060 050 020 040 020 040
SELIGMAN 057/083 057/089 058/090 050 040 020 040 030 040
SHOW LOW 056/077 056/080 056/082 060 050 030 040 040 040
ST. JOHNS 053/080 054/082 053/084 050 040 020 040 030 040
WUPATKI N.M. 059/087 060/089 059/091 050 040 020 030 020 030AZZ004>018-037>040-160200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 700 AM MST FRI AUG 15 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY ...FLASH FLOOD WATCH UNTIL MIDNIGHT FRIDAY FOR YAVAPAI...NORTHWEST GILA AND WESTERN COCONINO COUNTY... DEEP MOISTURE IS LOCATED ALONG...SOUTH AND WEST OF THE MOGOLLON RIM. LATER THIS AFTERNOON THUNDERSTORMS ARE EXPECTED TO FORM ALONG THE MOGOLLON RIM AND MOVE TO THE SOUTHWEST INTO THE DEEPER MOISTURE. THE RESULT WILL BE SCATTERED HEAVY RAIN PRODUCING THUNDERSTORMS...ESPECIALLY OVER YAVAPAI COUNTY. LOCALLY UP TO TWO INCHES OF RAINFALL CAN BE EXPECTED IN THE AREAS UNDER THE FLASH FLOOD WATCH...MAINLY LATE THIS AFTERNOON AND THIS EVENING. ELSEWHERE ACROSS NORTHERN ARIZONA...ONLY ISOLATED TO SCATTERED THUNDERSTORM. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. DEFINITION OF HAZARDOUS WEATHER...A WEATHER EVENT POSING A THREAT TO LIFE AND PROPERTY.
The Flagstaff radar (KFSX), 150 km away, was scanning. The volume nearest the first event began at 01:11 UTC.
1 flash flood. Local standard time, as filed.
A "massive" flash flood swept through Antelope Canyon near Page. Four feet of sand was removed from this slot canyon with even higher water levels. State Route 98 was flooded near mile post 307 and from mile post 300 to mile post 302.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2003Every state in 2003This day in weather historyWarnings in Arizona, August 2003
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: 5374249.