1 heavy rain, 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, 2:50 AM PST, 10 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RENO NV 350 AM PDT FRI AUG 20 2004 .SHORT TERM... UPPER TROUGH OFF CALIFORNIA COAST SHOWS UP WELL ON WATER VAPOR IMAGERY. SOUTHERLY FLOW EAST OF THE TROUGH IS HELPING TO BRING MOISTURE INTO THE REGION. CONVECTION CONTINUES OVER THE NORTHERN SIERRA AND NORTHWEST NEVADA BUT HAS BEEN WEAKENING LAST COUPLE OF HOURS. THE GFS...ECMWF...CANADIAN AND NOGAPS ALL CONTINUE TO SHOW THE UPPER TROUGH OFF CA COAST REMAINING FAIRLY STATIONARY THROUGH THE WEEKEND. THIS TROUGH SHOULD DEEPEN IN RESPONSE TO A SHORTWAVE MOVING FROM THE GULF OF ALASKA TO BRITISH COLUMBIA BY SATURDAY MORNING. THE COLD AIR ALOFT WILL KEEP LAPSE RATES FAIRLY STEEP OVER THE KREV CWFA. PRECIP WATER VALUES WILL REMAIN BETWEEN 0.5 AND 1.0 INCH THROUGH 00Z SUNDAY. CLOUDS WILL REMAIN OVER THE REGION AND AFTERNOON HEATING WILL CAUSE ENOUGH LOW LEVEL FORCING TO GENERATE SCATTERED TSRA ACROSS ENTIRE CWFA THROUGH SATURDAY. INSTABILITY DECREASES SOME ON SUNDAY WITH MAIN AREA OF TSTMS OVER SOUTHEAST THIRD OF ZONES FROM MONO COUNTY THROUGH EASTERN CHURCHILL AND PERSHING COUNTIES. TEMPS WILL REMAIN NEAR NORMAL THROUGH THE WEEKEND. OHARA .LONG TERM...MONDAY THROUGH THURSDAY... THERE IS STILL MUCH UNCERTAINTY IN THE MEDIUM RANGE AS THE NORTH AMERICAN PATTERN UNDERGOES SOME CHANGES AND MODELS TRY TO TAKE HOLD OF TROPICAL SYSTEMS AND ASSOCIATED INTEGRATION INTO THE NORTHERN PACIFIC WESTERLIES. THE 20/00Z GFS/ECMWF WERE CLOSE AT 120 HOURS BRINGING SHORTWAVE ENERGY ACROSS THE PACIFIC NORTHWEST AND PROGRESSING IT EASTWARD EARLY IN THE PERIOD. THIS WOULD RESULT IN A SLIGHT COOLING MAINLY IN NORTHERN AREAS AND PERHAPS A REMOTE CHANCE OF SHOWERS NEAR THE OREGON BORDER AROUND THE MONDAY NIGHT TIME FRAME AS SHORTWAVE ENERGY PASSES NORTH OF REGION. HEIGHTS ARE FAIRLY HIGH SO CONFIDENCE IS LOW WITH PRECIPITATION CHANCES MONDAY THROUGH TUESDAY. AT 120 HOURS BOTH MODELS SHOW ADDITIONAL ENERGY DROPPING SOUTHWARD TOWARD THE PACIFIC NORTHWEST FROM BRITISH COLUMBIA. IF THIS SOLUTION WERE CORRECT TROUGH WOULD DEEPEN A BIT MORE WITH ANOTHER ROUND OF LOWERING HEIGHTS THURSDAY. A SLOW TREND OF TROUGH DEVELOPMENT ACROSS THE WESTERN U.S. IS PREFERRED AND THIS FORECAST WILL CONTINUE TO SHOW TEMPERATURES NEAR ENSEMBLE MEANS. HOHMANN && .REV WATCHES/WARNINGS/ADVISORIES... .NV...NONE. .CA...NONE. &&
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
A total of 0.80 inches of rainfall (0.69 inches in one hour) was recorded at a RAWS sensor 3 miles WNW of Bridgeport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2004Every state in 2004This day in weather historyWarnings in California, 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: 5432070.