1 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 11, 9:45 AM MST, 3 hours 30 minutes earlier.
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
945 AM MST MON AUG 11 2003
.SYNOPSIS...A MOIST AND UNSTABLE AIR MASS WILL REMAIN OVER ARIZONA
THIS WEEK. AFTERNOON AND EVENING SHOWERS WILL DEVELOP EACH
DAY...MAINLY OVER THE HIGHER TERRAIN.
.DISCUSSION...HIGH PRESSURE CONTINUES TO DOMINATE THE WEATHER
PATTERN OVER THE SOUTHWEST. 1200 UTC UA PLOTS SHOW THE HIGH IS NOW
CENTERED OVER ARIZONA WITH NE FLOW OVER THE EASTERN PORTION OF THE
STATE AND A SOUTHERLY FLOW OVER THE WESTERN PORTION. KFGZ SOUNDING
SHOWS LAPSE RATES REMAIN FAIRLY STEEP BELOW 500 MB BUT PW HAS
DECREASED SOME SINCE YESTERDAY. ON THE OTHER HAND...GPSMET IPWV
SHOWS THAT MOISTURE IS INCREASING THIS MORNING. IN FACT...GPSMET
SHOWS A STRONG DIURNAL CYCLE TO THE PW WITH VERY LOW VALUES IN THE
MORNING AND MUCH HIGHER VALUES IN THE EVENING FOR THE PAST FEW DAYS.
THUS...EXPECT THAT MOISTURE WILL INCREASE AGAIN DURING THE DAY
TODAY. BEST CHANCES FOR CONVECTION WILL REMAIN OVER THE HIGHER
TERRAIN OF THE MOGOLLON RIM...WHITE MOUNTAINS...AND KAIBAB PLATEAU.
LESSER CHANCES EXIST FOR THE LOWER ELEVATIONS. WITH WEAK WINDS
ALOFT...DO NOT EXPECT STORMS TO MOVE OFF OF THE HIGHER TERRAIN...SO
OUTFLOW BOUNDARIES WILL BE REQUIRED FOR CONVECTION TO DEVELOP OVER
THE LOWER ELEVATIONS. HAVE UPDATED GRIDS THIS MORNING TO DECREASE
POPS OVER THE LOWER ELEVATIONS. WILL SEND UPDATED ZFP SHORTLY. DB
.FGZ...NONE.
.CODED TEMPERATURES/POPS FOR SELECTED CITIES IN NORTHERN ARIZONA
CITY TEMPERATURES HI/LO PROBABILITY OF PRECIP
TDY TON TUE WED TDY TON TUE WED
FLAGSTAFF 084/051 079/051 078/053 040 030 050 020 050 020
WINSLOW 097/063 092/064 091/063 020 020 020 010 030 010
PRESCOTT 094/064 090/064 088/063 030 020 030 020 040 020
PAGE 102/074 096/071 094/071 030 020 020 010 030 010
WINDOW ROCK 088/054 084/054 081/053 030 030 040 020 040 020
CANYON DE CHELLY 097/065 090/062 087/061 030 020 030 020 030 010
COTTONWOOD 106/071 101/072 099/071 030 020 030 010 030 010
GRAND CANYON 091/051 085/053 083/053 040 020 040 020 040 020
GREER 078/050 074/048 073/050 040 040 050 030 050 020
HEBER 088/053 084/053 083/055 040 030 050 030 050 020
JACOB LAKE 082/053 077/051 076/053 030 020 030 020 040 020
NAVAJO N.M. 089/060 084/059 081/058 030 020 030 020 030 020
PAYSON 093/066 094/065 092/064 030 020 020 020 030 010
SEDONA 102/066 098/070 096/069 030 020 030 020 030 010
SELIGMAN 097/059 093/063 091/062 020 000 030 010 030 010
SHOW LOW 090/056 084/059 083/061 040 040 050 030 050 020
ST. JOHNS 097/067 095/064 093/063 030 020 030 020 030 010
WUPATKI N.M. 100/064 094/065 093/064 020 020 030 010 030 010AZZ004>018-037>040-120200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 700 AM MST MON AUG 11 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY A MOIST AND UNSTABLE AIR MASS REMAINS OVER ARIZONA TODAY. EXPECT AFTERNOON AND EVENING SHOWERS TO DEVELOP AGAIN...MAINLY OVER THE HIGHER TERRAIN. LIGHT WINDS ALOFT WILL RESULT IN SLOW MOVING STORMS SO THAT THERE IS A SLIGHT THREAT OF LOCALIZED FLOODING. SOME STORMS MAY ALSO PRODUCE STRONG AND GUSTY WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. A WARM AND MOIST AIR MASS WILL REMAIN OVER ARIZONA THIS WEEK RESULTING IN A CHANCE OF SHOWERS AND THUNDERSTORMS EACH DAY. .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 national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Flooding caused damage to two houses and one apartment building in Flagstaff. Three to four inches of water entered each building. At least two intersections on Route 66 were covered with three and a half feet of water.
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: 5374179.