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 Phoenix, AZ wrote its last area forecast discussion before the first event at Jul 17, 3:35 PM MST, 55 minutes earlier.
AZZ020>028-CAZ030>033-180545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 335 PM MST TUE JUL 17 2001 .SYNOPSIS... ARIZONA REMAINS BETWEEN LOW PRESSURE ALONG THE WEST COAST AND A HIGH PRESSURE SYSTEM OVER THE GREAT PLAINS. A LOW PRESSURE SYSTEM FROM NORTHWEST MEXICO MOVING NORTH MEANS SCATTERED SHOWERS AND THUNDERSTORMS IN SOUTH-CENTRAL ARIZONA TONIGHT...WITH SOME CLOUDS SPREADING OVER SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA. DRIER AIR FROM THE SOUTHWEST IS EXPECTED TO DECREASE THE CHANCE OF SHOWERS AND THUNDERSTORMS OVER SOUTH-CENTRAL ARIZONA BY FRIDAY AND SATURDAY. .DISCUSSION... AN INCREASE IN SHOWERS AND THUNDERSTORMS WAS TAKING PLACE IN SOUTH-CENTRAL ARIZONA EARLIER THAN EXPECTED THIS AFTERNOON. A HAZARDOUS WEATHER OUTLOOK WAS ISSUED EARLIER THIS AFTERNOON TO COVER THE POSSIBILITY OF STRONG THUNDERSTORMS LATE THIS AFTERNOON AND TONIGHT. A WEAK LOW PRESSURE SYSTEM IN NORTHWEST MEXICO MOVING NORTH IS RESPONSIBLE FOR THIS INCREASE IN SHOWERS AND THUNDERSTORMS. HAVE WORDED THE FORECAST WITH MAINLY EVENING SHOWERS AND THUNDERSTORMS IN SOUTH-CENTRAL ARIZONA...BUT THERE IS STILL A POSSIBILITY OF SHOWERS AND THUNDERSTORMS AT LEAST OVERNIGHT AND WEDNESDAY AS THE LOW PRESSURE SYSTEM CONTINUES APPROACHING FROM THE SOUTH. DRIER AIR FROM THE SOUTHWEST IS EXPECTED TO DECREASE THE CHANCE OF SHOWERS AND THUNDERSTORMS OVER SOUTH-CENTRAL ARIZONA BY FRIDAY AND SATURDAY. BEYOND THAT...THERE COULD BE AN INCREASE IN MOISTURE AGAIN. HOWEVER ...WITH SO MUCH UNCERTAINTY IN TIMING OF DRY AIR VERSES MORE HUMID AIR...HAVE CONTINUED SAME IDEA AS PREVIOUS FORECASTER FOR THE EXTENDED FORECAST...THAT IS A BROAD BRUSH OF MOSTLY CLEAR SKIES FOR SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA...AND PARTLY CLOUDY SKIES FOR SOUTH-CENTRAL ARIZONA WITH A CHANCE OF AFTERNOON AND EARLY EVENING SHOWERS AND THUNDERSTORMS OVER THE HIGHER TERRAIN. ELLIS
AZZ022>024-027-028-180700-
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
137 PM MST TUE JUL 17 2001
...ISOLATED STRONG THUNDERSTORMS ARE POSSIBLE OVER SOUTH-CENTRAL
ARIZONA LATE THIS AFTERNOON THROUGH TONIGHT...
COUNTIES IN THE RISK AREA INCLUDE:
IN ARIZONA...MARICOPA...NORTHWEST PINAL...AND SOUTHERN GILA.
THE PRIMARY HAZARDOUS WEATHER RISKS INCLUDE:
LOW VISIBILITIES DUE TO BLOWING DUST...GUSTY WINDS UP< TO 50 MPH
...BRIEF HEAVY RAIN...AND DANGEROUS CLOUD TO GROUND LIGHTNING.
STORM SPOTTER ACTIVATION MAY BE NECESSARY LATE THIS AFTERNOON
THROUGH TONIGHT.
CRAIG ELLISThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
The area near Hayden and McDowell received the most rain, as one spotter reported over an inch in only 15 minutes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2001Every state in 2001This day in weather historyWarnings in Arizona, July 2001
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: 5257921.