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 Aug 20, 1:35 PM PST, 2 hours 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RENO NV 235 PM PDT FRI AUG 20 2004 .SHORT TERM... UPPER LOW OFF CENTRAL CA COAST AND WEAK VORTICITY CENTER OVER NORTHCENTRAL NV IS DEPICTED WELL ON WATER VAPOR IMAGERY THIS AFTERNOON. THE OFFSHORE LOW IS MOVING SLOWLY SOUTH-SOUTHWEST WHILE THE VORT MAX IS MOVING SOUTHEAST. THE MAIN DEFORMATION AXIS BETWEEN THESE FEATURES WAS EAST-WEST THROUGH THE LAKE TAHOE AREA. THUNDERSTORMS HAVE DEVELOPED SOUTH OF THE DEFORMATION ALONG A SURFACE THERMAL TROUGH CURRENTLY OVER THE SIERRA. OTHER THUNDERSTORMS WERE FORMING OVER NORTHERN WASHOE AND NORTHERN LASSEN COUNTIES WHERE SOME DYNAMICS WERE BEING GENERATED BY THE NEARBY VORTICITY MAX. CUMULUS CLOUDS WERE FORMING OVER OTHER PORTIONS OF THE CWA BUT HAVE NOT PRODUCED LIGHTNING YET. CHANGES ARE EXPECTED IN THE LARGE SCALE PATTERN OVER THE NEXT FEW DAYS AS A SERIES OF SHORT WAVES CARVE OUT A TROUGH OVER THE PACIFIC NORTHWEST. ONE SHORT WAVE PUSHES A COLD FRONT INTO NORTHWEST NV SUNDAY EVENING WITH GUSTY WINDS PRECEDING THE FRONT IN THE AFTERNOON. A SECOND SHORT WAVE DEEPENS THE TROUGH MONDAY AND MONDAY NIGHT WITH BREEZY AND COOLER CONDITIONS EXPECTED ACROSS THE SIERRA AND WESTERN NV. TEMPERATURES WILL COOL TO READINGS SLIGHTLY BELOW NORMAL BY MONDAY AND COULD SEVERAL DEGREES LOWER IF THE TROUGH DROPS FARTHER SOUTH THAN CURRENTLY FORECAST. RC .LONG TERM...TUESDAY THROUGH FRIDAY... NOT MUCH CHANGE TO CURRENT EXTENDED FORECAST. TROUGH STILL PROGGED TO MOVE INTO PACNW WITH THE UKMO SLOWER AND DEEPER WITH THIS FEATURE TUE AND WED. COLD FRONT PUSHES THROUGH NORTHERN NV TUESDAY AND SAGS SOUTH TO CENTRAL UT AND SOUTHERN NV WEDNESDAY. THIS WILL CREATE BREEZY TO WINDY CONDITIONS TUESDAY AND ESPECIALLY WED WITH TIGHT GRADIENT ACROSS AREA. A FEW SHOWERS MAY BRUSH THE OREGON/NEVADA BORDER. BY THUR FRONT SINKS FURTHER SOUTH AND WEAKENS WITH SOME MODERATION IN TEMPERATURES BY FRIDAY. EXPECT TEMPERATURES TO DROP 10 TO 15 DEGREES TUESDAY ACROSS REGION...ESPECIALLY LASSEN AND NORTHERN WASHOE...FROM THIS WEEKENDS HIGHS WITH SOME MODERATION FRIDAY. JAH && .REV WATCHES/WARNINGS/ADVISORIES... .NV...NONE. .CA...NONE. &&
The Reno radar (KRGX), 162 km away, was scanning. The volume nearest the first event began at 00:01 UTC.
1 flash flood. Local standard time, as filed.
As a result of heavy rainfall, rocks (some 8 to 12 inches in diameter) were washed onto U.S. Hwy. 95 near Schurz.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2004Every state in 2004This day in weather historyWarnings in Nevada, August 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: 5431429.