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 Reno, NV wrote its last area forecast discussion before the first event at Jul 23, 1:10 PM PST, 1 hour 50 minutes earlier.
WESTERN NEVADA AND EASTERN CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RENO NV 210 PM PDT WED JUL 23 2003 CONVECTION HAS BEEN DEVELOPING OVER MUCH OF THE CWA THIS AFTERNOON IN A MOIST AND UNSTABLE AIRMASS. THUNDERSTORMS HAVE BEGUN TO PRODUCE HEAVY RAIN AND HAIL IN EASTERN CA. THIS AREA IS IN A FLASH FLOOD WATCH UNTIL 9 PM ALONG WITH ADJACENT PORTIONS OF WESTERN NV. A WEAK SHORT WAVE IS ROTATING AROUND THE UPPER HIGH OVER THE GREAT BASIN AND IS PROVIDING DYNAMICS FOR THE CONVECTION...WHICH SHOULD CONTINUE FOR THE NEXT SEVERAL HOURS. A SOUTHWEST FLOW DEVELOPS OVER NORTHEAST CA AND NORTHWEST NV THURSDAY BUT IS NOT STRONG ENOUGH TO REMOVE ALL THE MOISTURE THAT IS IN PLACE. HAVE RETAINED A SLIGHT CHANCE ALL ZONES FOR THE AFTERNOON. A WEAK UPPER LOW OFF THE CA COAST ON FRIDAY TURNS THE FLOW MORE SOUTHERLY AGAIN AND A SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS HAS BEEN ADDED FOR ALL ZONES. ON SATURDAY THE INSTABILITY MOVES SLIGHTLY EAST WITH SOME CONVECTION MENTIONED IN PERSHING...CHURCHILL AND MINERAL COUNTIES. TEMPERATURES WHICH REMAIN VERY HOT TODAY COOL GRADUALLY OVER THE NEXT COUPLE DAYS. TEMPERATURES SHOULD BE IN THE MID 90S WESTERN NV VALLEYS BY SATURDAY BUT THIS IS STILL AT OR A LITTLE ABOVE NORMAL. RC IN THE EXTENDED...SUNDAY THROUGH WEDNESDAY...THE LATEST GFS MODEL HAD LIMITED MOISTURE AND SLIGHTLY STABLE CONDITIONS ON SUNDAY. WORDING OF THUNDER WILL BE REMOVED WITH ONLY 10 PERCENT CHANCES IN THE EASTERN ZONES. ELSEWHERE DRY CONDITIONS SHOULD PREVAIL. FOR MONDAY THROUGH WEDNESDAY THE 12Z GFS CONTINUES TO MAINTAIN GENERAL CONSISTENCY FROM ITS PREVIOUS RUN...SUGGESTING A WETTER PATTERN AS IT BUILDS THE UPPER HIGH BACK TO EASTERN NEVADA AND THEN PIVOTS IT NORTHEAST IN RESPONSE TO TROUGH DEVELOPING OFF THE PACIFIC NORTHWEST COAST. THIS WOULD PROVIDE A MORE SOUTHERLY OR EVEN SOUTHEAST FLOW THROUGH MUCH OF NEXT WEEK AND MIGHT EVEN DRAW UP SOME SUBSTANTIAL MOISTURE FROM EASTERLY WAVE WORKING ACROSS NORTHERN MEXICO FOR 1-2 DAYS BEYOND THE CURRENT EXTENDED PERIOD. THE NOGAPS AND ECMWF SHOW SOME RESEMBLANCE OF THIS PATTERN ALTHOUGH ARE NOT QUITE AS AGGRESSIVE. MEANWHILE THE CANADIAN BUILDS THE HIGH RIGHT OVER NEVADA AND PARKS IT THERE. THE GFS SOLUTION WILL REMAIN THE PREFERRED GUIDANCE FOR THIS FORECAST AS OVERALL CONSISTENCY WAS MAINTAINED WITH THE LATEST RUN. SOME MINOR ADJUSTMENTS TO PRECIP CHANCES WERE TO EXPAND THE SLIGHT CHANCE ON MONDAY NORTHWARD TO NEAR HIGHWAY 50...AND INCREASE POPS TO CHANCE CATEGORY ON TUESDAY IN THE SOUTHERN ZONES. TEMPERATURES SHOULD REMAIN A FEW DEGREES ABOVE CLIMATOLOGICAL NORMALS BUT FEWER 100 DEGREE VALUES ARE EXPECTED. MJD .REV...FLASH FLOOD WATCH UNTIL 900 PM PDT NVZ002-003-005 AND CAZ070>073.
CAZ070>073-NVZ001>005-241400- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RENO NV 650 AM PDT WED JUL 23 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN NEVADA...THE EASTERN SIERRA AND NORTHEASTERN CALIFORNIA. .DAY ONE...TODAY FLASH FLOOD WATCH TODAY...SEE THE LATEST FLASH FLOOD WATCH BULLETIN FROM KREV/ WGUS65 KREV FFAREV/ FOR DETAILS. SCATTERED THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL ARE EXPECTED OVER THE AREA TODAY. THUNDERSTORMS INCLUDE THE THREAT OF DANGEROUS LIGHTNING...GUSTY SURFACE WINDS AND BLOWING DUST. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE THREAT OF AFTERNOON AND EVENING THUNDERSTORMS WILL SLOWLY DECREASE BEGINNING THURSDAY. HOWEVER...THE POSSIBILITY OF ISOLATED THUNDERSTORM ACTIVITY WILL RETURN SUNDAY THROUGH TUESDAY IN THE SOUTH AND EAST. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS AND EMERGENCY MANAGERS ARE URGED TO MONITOR FORECASTS AND RELATED MESSAGES AND BE PREPARED FOR POSSIBLE ACTIVATION TODAY. IN ADDITION...WEATHER SPOTTERS ARE ASKED TO REPORT SIGNIFICANT WEATHER CONDITIONS TO THEIR LOCAL NATIONAL WEATHER SERVICE OFFICE.
The Reno radar (KRGX), 103 km away, was scanning. The volume nearest the first event began at 23:00 UTC.
1 flash flood. Local standard time, as filed.
Heavy thunderstorm rains cause mud and debris to flow across Eastlake Boulevard in Washoe Valley.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2003Every state in 2003This day in weather historyWarnings in Nevada, July 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: 5379622.