1 lightning, 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 Sep 1, 1:45 PM PST, 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SEATTLE WA 245 PM PDT WED SEP 1 2004 .SYNOPSIS...COOL UNSTABLE AIR ASSOCIATED WITH AN UPPER LEVEL TROUGH OVER THE AREA WILL REMAIN IN PLACE THIS EVENING KEEPING SHOWERS AND ISOLATED THUNDERSTORMS IN THE FORECAST. SMALL HAIL IS ALSO POSSIBLE WITH THE THUNDERSTORMS. ANOTHER WEAK UPPER LEVEL DISTURBANCE WILL MOVE THROUGH THE AREA ON THURSDAY KEEPING A CHANCE OF A SHOWER IN THE FORECAST. HIGH PRESSURE WILL BUILD OVER WESTERN WASHINGTON ON FRIDAY FOR A DRYING AND WARMING TREND INTO THIS WEEKEND. && .DISCUSSION...SATELLITE IMAGERY SHOWS NUMEROUS SHOWERS OVER WESTERN WASHINGTON AT 21Z. SOME ECHOES ON THE WSR-88D OVER 60 DBZ ESPECIALLY OVER SNOHOMISH COUNTY. WILL ADD THE POSSIBILITY OF HAIL TO THE EVENING FORECAST. WITH THE RAINFALL RATES OFF THE RADAR RUNNING NEAR AN INCH AN HOUR IN SOME SPOTS A URBAN AND SMALL STREAM FLOOD ADVISORY HAS BEEN ISSUED FOR SKAGIT...SNOHOMISH...KING AND PIERCE COUNTIES THIS AFTERNOON INTO THE EARLY EVENING HOURS. ACARS SOUNDINGS REPORT 500 MB TEMPERATURES OF -22C OVER KSEA THIS AFTERNOON...JUST AS THE MODELS PREDICTED. THIS IS THE CORE OF THE COOL AIR POOL THAT WAS TRAILING THIS MORNINGS FRONT. AIR MASS WILL REMAIN UNSTABLE THIS EVENING AS THIS AIR MASS MOVES THROUGH WESTERN WASHINGTON. STABILITY OF THE AIR MASS WILL INCREASE LATER THIS EVENING WITH THE COMBINATION OF THE SUN GOING DOWN AND THE COOL AIR POOL MOVING OFF TO THE EAST. UPPER LEVEL RIDGE STARTING TO BUILD OFFSHORE TONIGHT AND INTO NORTHERN BRITISH COLUMBIA ON THURSDAY. UPPER LEVEL TROUGH SLOW TO MOVE EAST WITH ANOTHER SHORTWAVE ROTATING AROUND THE BACK SIDE OF THE TROUGH. AMS STILL SOMEWHAT UNSTABLE TOMORROW AND EVEN WITH THE NORTHERLY FLOW ALOFT WITH THE SHORTWAVE MOVING INTO THE AREA WILL HAVE TO INCLUDE A CHANCE OF SHOWERS IN THE FORECAST. BEST CHANCES WILL BE OVER THE CASCADES. UPPER LEVEL RIDGE FINALLY KICKS THE TROUGH FAR ENOUGH EAST THURSDAY NIGHT TO DRY THE FORECAST OUT. SURFACE GRADIENTS REMAIN ONSHORE FRIDAY KEEPING DAYTIME HIGHS NEAR NORMAL. FIRST IN A SERIES OF SHORTWAVES RIDING BY TO THE NORTH ON SATURDAY FLATTENING THE RIDGE OUT SOME BUT WITH THE JET AIMED AT CENTRAL BRITISH COLUMBIA DO NOT EXPECT ANY PRECIPITATION TO GET THIS FAR SOUTH. .EXTENDED...UPPER LEVEL RIDGE ON THE EXTENDED MODEL RUNS NOW SHOWING LESS AMPLITUDE THEN PREVIOUS RUNS. ZONAL FLOW ALOFT ACROSS THE EASTERN PACIFIC WITH A SERIES OF SHORTWAVES MOVING INTO CENTRAL BRITISH COLUMBIA DURING THE PERIOD. WHILE THE RUN TO RUN CONSISTENCY IS NOT REAL GOOD THE ENSEMBLES FROM WITHIN THE GFS RUN SHOWING GOOD CONSISTENCY. OTHER EXTENDED MODELS ARE PRETTY CLOSE TO THE GFS SOLUTION WITH SHORTWAVES MOVING BY TO THE NORTH. WILL STAY WITH THE DRY FORECAST FOR NOW AND JUST KNOCK A COUPLE OF DEGREES OF THE MAX TEMPS FOR THE PERIOD. FELTON .SEW...SMALL CRAFT ADVISORY CENTRAL AND EASTERN STRAIT THROUGH TONIGHT. .KATX..VCP12/CSR21 OPERATIONAL. &&
The Seattle radar (KATX), 60 km away, was scanning. The volume nearest the first event began at 21:58 UTC.
1 lightning. Local standard time, as filed.
A lightning strike destroyed a tree and fried the electrical system in the nearby home.
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, September 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: 5423692.