1 thunderstorm wind, as filed by the National Weather Service.
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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 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 Aug 17, 1:41 AM PST, 2 hours 25 minutes earlier.
AZZ020>028-CAZ030>033-171745- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 241 AM MST FRI AUG 17 2001 .SYNOPSIS... AN UPPER-AIR DISTURBANCE MOVING SOUTH ACROSS SOUTH-CENTRAL ARIZONA TRIGGERED SCATTERED THUNDERSTORMS LAST EVENING AND THIS MORNING. THIS DISTURBANCE WILL CONTINUE SOUTHWARD AS HIGH PRESSURE BUILDS IN FROM THE WEST OVER SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA. THE AIR WILL DRY A LITTLE AS THE HIGH PRESSURE MOVES OVER THE AREA... BUT NOT ENOUGH TO COMPLETELY STOP POSSIBLE AFTERNOON AND NIGHTTIME THUNDERSTORMS...MAINLY OVER THE HIGHER TERRAIN IN SOUTH-CENTRAL ARIZONA...THROUGH SATURDAY. A BETTER CHANCE FOR STORMS WILL EXIST ACROSS SOUTHWEST AND SOUTH-CENTRAL ARIZONA SUNDAY AND MONDAY AS A DISTURBANCE MOVES NORTHWESTWARD ACROSS THE AREA. THE HIGH PRESSURE AREA IS FORECAST TO MOVE SOUTH OF THE REGION EARLY NEXT WEEK... LEADING TO SOMEWHAT DRIER CONDITIONS AND LOWER TEMPERATURES. .DISCUSSION... UPPER-AIR DISTURBANCE CAUSING A RUCKUS AS IT TRIGGERED THUNDERSTORMS ACROSS S-CNTRL AZ LATE LAST EVE AND THIS MORNING UNDER DIFLUENT FLOW PATTERN ASSOCIATED WITH COL AT H3. ALL CAME TOGETHER OVER S-CNTRL AZ AT THE RIGHT TIME. DISTURBANCE APPEARS TO BE CONTINUING SWD...WITH STORMS SOON TO CLEAR THE PHOENIX METRO AREA. HIGH PRESSURE EXPECTED TO BUILD IN FROM THE W...BUT STEERING FLOW TO REMAIN OFF THE HIGHER TERRAIN TO THE N. THEREFORE...WILL STAY WITH MOS GUIDANCE OF 20 PCT POPS FOR TOMORROW NIGHT FOR THE PHOENIX METRO AREA...BUT IN GENERAL WILL STAY PRETTY CLOSE TO THE PREVIOUS FORECAST. GETTING HOTTER AS HIGH BUILDS IN...BUT WILL NOT GO QUITE AS HOT AS PREVIOUS FORECAST ...AS EXPECT SFC RH TO REMAIN PRETTY HIGH...AS NOTHING MUCH TO SCOUR IT OUT. ETA AND AVN MODELS FORECAST SE AZ DEFORMATION ZONE TO MOVE A LITTLE FARTHER N TODAY...TO A POSITION FAVORING MORE AFTERNOON AND EVENING CONVECTION OVER THE ERN MOGOLLON RIM AND WHITE MOUNTAINS. H5 NELY STEERING CURRENTS...AND SOME COOL ADVECTION AT H5 TO REINFORCE CAPE OVER THE DESERTS...SHOULD LEAD TO STORMS MOVING OR PROPAGATING TOWARD THE LOWER DESERTS EARLY THIS EVENING. FOR WHAT IT IS WORTH ...ETA SEEMED TO CAPTURE THE IMPULSE TRIGGERING STORMS THIS MORNING BETTER THAN DID THE AVN. AS FOR THE EXTENDED...WILL LEAVE IT AS IS FOR NOW. WILT
The Yuma radar (KYUX), 27 km away, was scanning. The volume nearest the first event began at 12:24 UTC.
1 thunderstorm wind. Local standard time, as filed.
A large thunderstorm complex which had developed a gust front up to 60 miles long in south central Arizona moved to the southwest into Yuma County Arizona and eastern Imperial County, California. As the gust front moved west across the Colorado River into Winterhaven, about 30 large trees were uprooted.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2001Every state in 2001This day in weather historyWarnings in California, August 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: 5262744.