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 Las Vegas, NV wrote its last area forecast discussion before the first event at Aug 2, 2:00 PM PST, 2 hours earlier.
MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 300 PM PDT SAT AUG 2 2003 .SYNOPSIS...DRIER AIR WILL SPREAD ACROSS THE AREA SUNDAY THROUGH TUESDAY AS AN AREA OF LOW PRESSURE MOVES INTO THE PACIFIC NORTHWEST. ANY THUNDERSTORMS ON SUNDAY WILL BE CONFINED TO CENTRAL NEVADA WITH NO STORMS EXPECTED ACROSS THE SOUTHERN GREAT BASIN AND MOJAVE DESERT MONDAY AND TUESDAY. TEMPERATURES WILL WARM TO NEAR NORMAL MONDAY AND TUESDAY WITH BREEZY CONDITIONS EXPECTED ACROSS CENTRAL NEVADA TUESDAY. .SHORT TERM...ISOLATED SHOWERS/THUNDERSTORMS HAVE DEVELOPED ACROSS SOUTHERN CLARK COUNTY FROM SEARCHLIGHT NORTH TO NELSON. STORMS SLOWLY DRIFTING NORTHEAST TOWARD HOOVER DAM AND WILLOW BEACH. SATELLITE SHOWS REMAINDER OF DEVELOPMENT ACROSS THE MOUNTAINS CAPPED. PLOT OF SURFACE DEWPOINTS SHOWS DRIER AIR HAS BEGUN TO MIX TO THE SURFACE AS READINGS NOW BEGINNING TO FALL INTO THE LOWER 50S AND THIS SHOULD HELP SUPPRESS ANY FURTHER DEVELOPMENT LATER THIS AFTERNOON AND EVENING. FURTHER NORTHWEST STARTING TO SEE MORE DEVELOPMENT OVER THE SOUTHERN SIERRA NORTH TO NEAR ESMERALDA COUNTY. MODELS PROGGED BEST DYNAMICS ACROSS THIS AREA FROM NOW UNTIL 10 PM THIS EVENING SO WILL HOLD ONTO HIGHER POPS UP THERE. FOR SUNDAY-TUESDAY...ETA/GFS IN AGREEMENT SWINGING UPPER TROUGH INTO THE PACIFIC NORTHWEST COAST AND SUPPRESSING SUBTROPICAL RIDGE FURTHER EAST. DRY SOUTHWEST FLOW WILL CONTINUE THROUGH THE PERIOD WITH PRECIPITABLE WATER VALUES THAT WERE GREATER THAN 1.00 INCH TODAY FALLING TO LESS THEN 0.50 INCH TUESDAY. ALSO...SURFACE DEWPOINTS PROGGED FALL BACK INTO THE MID 40S. STILL BELIEVE THERE WILL BE ENOUGH RESIDUAL MOISTURE AND INSTABILITY OVER THE MOUNTAINS OF NORTHERN NYE AND LINCOLN COUNTIES TOMORROW FOR A CHANCE OF SHOWERS AND THUNDERSTORMS. HAVE REMOVED POPS ELSEWHERE. FOR MONDAY AND TUESDAY HAVE REMOVED POPS ALL ZONES. WITH THE APPROACH OF THE TROUGH WILL BE INCLUDING SOME BREEZY WORDING ACROSS THE NORTHERN ZONES TUESDAY. TEMPERATURES WARMING BACK TO NORMAL. .LONG TERM...UPPER TROUGH SHOULD STAY OVER THE PACNW THROUGH THE PERIOD. UPPER HIGH PROGGED TO REMAIN OVER NM/CO UNTIL IT BEGINS TO SHIFT WESTWARD AT THE END OF THE WEEK. DRIER SOUTHWESTERLY FLOW SHOULD DOMINATE WED AND THURS THEN TURN A LITTLE MORE SOUTHERLY OVER MOHAVE COUNTY FRI AND SAT AS THE HIGH EXPANDS AND MOVES CLOSER. LATEST GFS BRINGS SMALL AMOUNT OF MID LEVEL MOISTURE INTO MOHAVE COUNTY ON THURS...EURO IS STILL VERY DRY. HAVE INCREASED CLOUD COVER IN GRIDS BUT WILL WAIT ANOTHER RUN BEFORE ADDING POPS. ALSO MENTIONED BREEZY WORDING OVER THE NORTHERN ZONES WEDS AND THURS AS THE TROUGH APPROACHES THE COAST. WITH THE DRIER AIR AND HIGHER HEIGHTS TEMPERATURES SHOULD STAY CLOSE TO NORMAL. .LAS...NONE. PIERCE/OROW
AZZ001>003-036-CAZ026>029-NVZ013>022-021400- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAS VEGAS NV 500 AM PDT SAT AUG 2 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST CALIFORNIA/SOUTHERN NEVADA/NORTHWEST ARIZONA .DAY ONE...TODAY. A MOIST AND UNSTABLE AIRMASS REMAINS IN PLACE LEADING TO ISOLATED TO SCATTERED THUNDERSTORM ACTIVITY THIS AFTERNOON. SOME OF THE STRONGER STORMS THAT DEVELOP WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL IN A SHORT PERIOD OF TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. THUNDERSTORM ACTIVITY IS STILL EXPECTED SUNDAY BUT WILL DECREASE IN COVERAGE AS A DRIER AIRMASS MOVES INTO THE AREA. LITTLE TO NO THUNDERSTORM ACTIVITY EXPECTED MONDAY THROUGH MID WEEK.
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Flash flooding from a stationary thunderstorm caused Highway 168 near Westgard Pass to become impassable. Four vehicles were stuck in mud and debris for a short period of time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2003Every state in 2003This day in weather historyWarnings in California, 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: 5378064.