1 funnel cloud, 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 Las Vegas, NV wrote its last area forecast discussion before the first event at Sep 11, 1:12 PM PST, 18 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 212 PM PDT SAT SEP 11 2004 .SYNOPSIS...AN AREA OF LOW PRESSURE IS FORECAST TO MOVE INTO THE INTERMOUNTAIN WEST SUNDAY BRINGING A DRIER SOUTHWEST FLOW TO THE AREA. TEMPERATURES WILL REMAIN 2-3 DEGREES ABOVE NORMAL THROUGH TUESDAY. && .SHORT TERM...SCATTERED THUNDERSTORMS HAVE FORMED OVER THE FORECAST AREA WHERE MODERATE INSTABIILITY COMBINED WITH DIFFERENTIAL HEATING AND NUMEROUS REMNANT BOUNDARIES HAVE ALLOWED LFC TO BE REACHED OVER SEVERAL LOCAL AREAS. CONVECTION CONTINUES TO BE SUPPORTED BY LARGE SCALE LIFT ASSOCIATED WITH SUBTROPICAL JETSTREAK AS WELL. SLOW MOVEMENT AND TRAINING OF CELLS CONTINUES TO SUGGEST POTENTIAL FOR FLASH FLOODING IN SOME LOCATIONS AS STORMS BECOME MORE WIDESPREAD. MODELS HAVE BEEN CONSISTENT IN PROJECTING PACIFIC TROUGH TO MOVE ONSHORE TOMORROW AND FORCE THE DEEP MOISTURE TO RECEDE. THAT SHOULD OFFICIALLY MARK THE END TO OUR MONSOON SEASON FOR THIS YEAR. && .LONG TERM...AGREEMENT BETWEEN MODELS IS FAIR IN THE EXTENDED WEDNESDAY TO SATURDAY TIME FRAME WITH DIFFERENCES CENTERED AROUND DEPTH AND TIMING OF LATE WEEK TROUGHING OVER THE WEST. MOISTURE SHOULD BE LONG GONE FROM THIS WEEKENDS LAST MONSOON HURRAH. WESTERLY TO SLIGHT SOUTHWESTERLY FLOW...DEPENDING ON THE MODEL OF CHOICE...WILL CONTINUE TO KEEP MOISTURE OUT AND CLOUD COVER LOW. MINOR MODIFICATIONS TO TEMPERATURES WAS ABOUT THE ONLY THING MODIFIED IN THE EXTENDED. && .AVIATION...TAF ADEQUATELY COVERS ALL SIGNIFICANT WEATHER EXPECTED AT KLAS. && .VEF WATCHES/WARNINGS/ADVISORIES... .NV...FLOOD WATCH FOR FLASH FLOODING THIS AFTERNOON AND EVENING FOR NV ZONES 18/19-20/22 .AZ...NONE. .CA...FLOOD WATCH FOR FLASH FLOODING THIS AFTERNOON AND EVENING FOR CA ZONE 28. && RUNK/JACQUES
The Las Vegas radar (KESX), 102 km away, was scanning. The volume nearest the first event began at 21:30 UTC.
1 funnel cloud. Local standard time, as filed.
There were 15 different reports of funnel clouds southwest of Colorado City.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2004Every state in 2004This day in weather historyWarnings in Arizona, September 2004
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: 5422433.