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 8, 2:30 PM MST, 3 hours 31 minutes earlier.
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST FRI AUG 8 2003
.SYNOPSIS...MONSOON MOISTURE WILL REMAIN OVER NORTHERN ARIZONA
INTO NEXT WEEK. SHOWERS AND THUNDERSTORMS WILL DEVELOP EACH DAY.
.DISCUSSION...CONVECTION HAS FIRED UP OVER THE RIM AND WHITES.
STORMS SHOULD INCREASE ACROSS THE LCR DURING THE AFTERNOON. EXPECT
THE STORMS TO BE HEAVY RAIN PRODUCERS. INSTABILITY LINGERS
OVERNIGHT IN THE LCR AND NOCTURNAL ACTIVITY EXPECTED. WESTERN CWA
STABILIZES AND STORMS THERE SHOULD DIMINISH BY MIDNIGHT.
THE CENTER OF THE MID LEVEL RIDGE LOCATED EAST OF THE STATE MIGRATES
TO NEAR THE 4-CORNERS AREA THIS WEEKEND. MOISTURE ALREADY OVER THE
CWA TO REMAIN TRAPPED. SEE NO GOOD LIFTING MECHANISMS...I.E. STRONG
VORT MAXES OR S/WVS...BUT HEATING AND CONVERGENCE OVER THE HIGHER
TERRAIN ENOUGH TO CONTINUE FCST OF LOW GRADE MONSOON ACTIVITY. PW
PROGGED TO INCREASE ON MONDAY AS E-SE FLOW INTO AZ STRENGTHENS.
EXPECT THE MOST ACTIVE REGION THE NEXT FEW DAYS TO BE OVER THE RIM
...WHITES AND LCR AS THIS REGION IS THE MOST MOIST AND UNSTABLE.
EXTENDED...MEDIUM RANGE MODELS CONTINUE TO DELAY ONSET OF DRYING
OVER THE STATE AS EPAC TROF MOVES ONSHORE. CWA MAY SEE DOWNSWING IN
CONVECTIVE ACTIVITY...ESPECIALLY WESTERN SECTIONS. FOR NOW WILL
CONTINUE LOW GRADE MONSOON WITH MENTION OF SLIGHT CHANCE POPS. DF
.FGZ...NONE.
.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 052/080 053/080 053/080 020 040 020 040 020 040
WINSLOW 062/092 064/092 065/092 020 030 020 040 020 030
PRESCOTT 065/092 064/090 064/090 010 010 010 020 010 020
PAGE 071/093 072/094 072/094 010 010 010 030 010 020
WINDOW ROCK 055/085 054/085 054/085 030 050 030 030 020 040
CANYON DE CHELLY 063/091 062/091 062/091 030 040 030 030 020 030
COTTONWOOD 074/104 073/102 073/102 020 010 010 020 010 020
GRAND CANYON 052/081 053/081 053/081 020 030 010 030 010 030
GREER 049/075 050/075 050/075 040 060 040 050 020 050
HEBER 054/085 055/085 055/085 030 050 030 040 020 050
JACOB LAKE 056/081 056/081 056/081 020 030 010 030 010 030
NAVAJO N.M. 059/088 059/086 059/087 020 030 020 030 020 040
PAYSON 066/096 065/094 065/094 020 020 020 030 020 020
SEDONA 071/100 070/098 070/098 020 020 020 030 020 020
SELIGMAN 062/096 062/093 062/093 010 010 010 020 010 010
SHOW LOW 059/084 060/084 060/085 030 050 030 040 020 050
ST. JOHNS 057/087 059/087 060/087 030 050 030 040 020 040
WUPATKI N.M. 063/094 065/094 066/094 020 030 020 040 020 030AZZ004>018-037>040-090200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 920 AM MST FRI AUG 8 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY MOISTURE REMAINS PLENTIFUL OVER THE STATE. WIDESPREAD SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS THE REGION TODAY. THE STORMS WILL DEVELOP BY EARLY AFTERNOON OVER MOGOLLON RIM AND WHITE MOUNTAINS. A WESTERLY FLOW ALOFT WILL PUSH THESE STORMS INTO THE LITTLE COLORADO RIVER VALLEY DURING THE AFTERNOON. THE MORE NUMEROUS AND STRONGER STORMS ARE EXPECTED IN THESE AREAS. SOME STORMS ARE LIKELY TO PRODUCE HEAVY DOWNPOURS AND DEADLY LIGHTNING. THE MAIN THREAT TODAY IS AGAIN LOCALIZED HEAVY DOWNPOURS AND THE POTENTIAL FOR SMALL STREAM FLOODING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. MOISTURE IS EXPECTED TO REMAIN OVER THE STATE THROUGH THE PERIOD. AFTERNOON AND EVENING THUNDERSTORMS WILL DEVELOP 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 flash flood. Local standard time, as filed.
A five foot wall of water came down Havasu Creek near the town of Supai. Hikers were able to escape to higher ground and the Supai Trail was closed for four hours.
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: 5374178.