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 Seattle, WA wrote its last area forecast discussion before the first event at Aug 6, 9:45 AM PST, 1 hour 15 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED DATE NATIONAL WEATHER SERVICE SEATTLE WA 1045 AM PDT FRI AUG 6 2004 .SYNOPSIS...A VIGOROUS PACIFIC FRONT WILL BRING RAIN TO WESTERN WASHINGTON THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS WILL FOLLOW THE FRONT THIS AFTERNOON AND EVENING. HIGH PRESSURE WILL BUILD RAPIDLY OVER THE AREA BEHIND THE FRONT SUNDAY AND MONDAY...BRINGING SUNNY AND MUCH WARMER WEATHER. && .DISCUSSION...UPPER TROUGH AND SURFACE FRONT CURRENTLY MOVING INTO WESTERN WASHINGTON. RAIN OCCURRING MOST AREAS AS A RESULT. RAIN WILL CHANGE TO SCATTERED SHOWERS THIS AFTERNOON AS THE SURFACE FRONT MOVES INLAND. UPPER TROUGH WILL LAG SLIGHTLY BEHIND...MOVING OVERHEAD AROUND 00Z THEN INTO EASTERN WASHINGTON AFTER 06Z. THE PASSAGE OF THE UPPER TROUGH IS COINCIDENT WITH MAXIMUM DAYTIME HEATING. THERE SHOULD BE SOME SUN BREAKS TO BOOT THIS AFTERNOON TO GENERATE CONVECTION. CHANCE OF THUNDERSTORMS SEEM REASONABLE WITH THIS PATTERN. BEST CHANCES APPEAR TO BE CENTRAL AND SOUTH PUGET SOUND AND CENTRAL CASCADES WHERE LAPSE RATES WILL BE STEEPEST AND CAPE HIGHEST. HIGH PRESSURE WILL RAPIDLY BUILD OVER THE AREA WITH H5 HEIGHTS UP TO 580 DAM BY SATURDAY AFTERNOON. LOW LEVEL FLOW WILL STILL BE NORTHWESTERLY WHICH SHOULD PRECLUDE A REAL DRAMATIC WARM UP. BY SUNDAY...H5 HEIGHTS UP TO 588 DAM AND LOW LEVEL FLOW WILL BE MORE NORTHERLY SO MANY AREAS SHOULD WARM INTO THE 80S. MONDAY LOOKS LIKE THE WARMEST DAY WITH THE THERMAL TROUGH ALONG THE COAST. CURRENT FORECAST LOOKS A LITTLE TOO COOL. WILL ADDRESS THAT ON AFTERNOON FORECAST. THE INEVITABLE PUSH AND COOL DOWN WILL BEGIN MONDAY NIGHT AND TUESDAY WITH MORE SEASONABLE TEMPS AND CLOUDS FOR THE REMAINDER OF THE WEEK. CURRENT FORECAST ON TRACK. NO UPDATES PLANNED. SCHNEIDER && .SEW...SMALL CRAFT ADVISORY COAST...WEST ENTRANCE AND CENTRAL STRAIT. .KATX..VCP21/CSR32 OPERATIONAL. &&
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Anywhere from one to two inches of rain fell over most of Snohomish county, the hardest hit areas were from Mountlake Terrace northeast to Lake Stevens. About 1000 homes lost power, and flooding and mudslides damaged a few roads, farmland and homes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2004Every state in 2004This day in weather historyWarnings in Washington, 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: 5419748.