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 Pendleton, OR wrote its last area forecast discussion before the first event at May 19, 1:30 PM PST, 4 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OREGON 230 PM PDT WED MAY 19 2004 .SHORT TERM...THROUGH FRIDAY NIGHT. CONCERN THIS PACKAGE IS WITH THUNDER/RAIN CHANCES THROUGH THURSDAY. LOW PRESSURE OVER SOUTHERN OREGON...MOISTURE...AND AN UNSTABLE AIR MASS WILL PRODUCE THUNDERSTORMS INTO EARLY EVENING WITH THE BETTER CHANCES OVER THE EASTERN SLOPES OF THE WASHINGTON CASCADES AND WALLOWA MTNS. WITH THE LOSS OF DAYTIME HEATING THE TSRA SHUD DIMINISH AFTER SUNSET. HOWEVER...SHRA WILL CONTINUE TONIGHT. MODEL COMPARISON INDICATED A BETTER GFS SOLN WITH PCPN AND WILL LEAN TOWARD THIS SOLN. INSTABILITY RETURNS TOMORROW AND THUNDERSTORMS ARE EXPECTED TO DEVELOP AGAIN ACROSS THE REGION. SOME OF THE STORMS MAY BECOME STRONG TOMORROW PRIMARILY ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES AND PERHAPS INTO THE BASIN. THE TSRA SHUD WEAKEN AGAIN AFTER SUNSET WHILE THEY DRIFT TOWARD THE EAST. A LONG WAVE TROUGH REMAINS OVER THE AREA FOR FRIDAY AND UNSETTLED WEATHER IS EXPECTED TO CONTINUE. SOME DRIER AIR WORKS ITS WAY INTO THE REGION AND RAIN CHANCES SHOULD BE ON THE DECREASE FROM WEST TO EAST. IN ADDITION...PRESSURE GRADIENTS TIGHTEN AND WINDS MAY BECOME BREEZY LATE FRIDAY INTO THE NIGHT ESPECIALLY IN THE GORGE/ELN/DLS AND THE BASIN. HIGH TEMPERATURES OVER THE JOHN DAY/WALLOWA AREA SHUD MAKE A REBOUND TOMORROW AND FOR THE REMAINDER OF THE REGION THEY SHUD BE AT OR SLIGHTLY ABOVE NORMAL THROUGH THE END OF THE WEEK. .LONG TERM...ANOTHER STRONG UPPER LOW PRESSURE SYSTEM WILL DROP DOWN OUT OF WESTERN BRITISH COLUMBIA INTO THE PACIFIC NORTHWEST ON FRIDAY NIGHT AND SATURDAY. THE LONGER RANGE MODELS ARE IN GOOD AGREEMENT NOW WITH THE MOVEMENT AND STRENGTH OF THIS UPPER LOW. IT WILL BRING A FRESH SUPPLY OF COLD AND UNSTABLE AIR ALOFT TO THE REGION TO CAUSE SCATTERED SHOWERS AND THUNDERSTORMS. THIS UNSETTLED WEATHER PATTERN WILL CONTINUE THOUGH NEARLY ALL OF THE EXTENDED PERIOD AS THIS UPPER LOW WILL BE VERY SLOW MOVING. THERE MAY EVEN BE A PERIOD OF STEADY PRECIPITATION AS THE UPPER LOW SLIDES SOUTHEAST AND CAUSES A WRAP AROUND EAST TO NORTHEAST FLOW OF MOISTURE INTO THE FORECAST AREA. TEMPERATURES WILL BE MILD AT FIRST BUT THEN WILL COOL AS THE COLDER AIR ALOFT MOVES INTO THE REGION AND MIXES DOWN TO THE SURFACE. RSC. && .PRELIMINARY POINT TEMPS/POPS... PENDLETON (AIRPORT) 48 76 50 76 / 30 30 30 20 WALLA WALLA 52 77 53 77 / 30 30 30 20 TRI-CITIES 52 82 53 82 / 20 20 20 20 YAKIMA 51 80 51 82 / 30 30 30 20 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...NONE. WA...NONE. &&
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE PENDLETON OR 855 AM PDT WED MAY 19 2004 ORZ041>050-WAZ024>030-201200- BLUE MOUNTAINS OF OREGON OR-CENTRAL OREGON OR- EAST COLUMBIA RIVER GORGE OR-EAST COLUMBIA RIVER GORGE WA- EAST SLOPES SOUTHERN CASCADES WA-FOOTHILLS OF THE BLUE MOUNTAINS WA- FOOTHILLS OF THE BLUE MOUNTAINS OR-GRANDE RONDE VALLEY OR- JOHN DAY VALLEY OR-KITTITAS VALLEY WA-LOWER COLUMBIA BASIN WA- LOWER COLUMBIA BASIN OR-NORTH CENTRAL OREGON OR- NORTHWEST BLUE MOUNTAINS WA-OCHOCO-JOHN DAY HIGHLANDS OR- WALLOWA COUNTY OR-YAKIMA VALLEY WA- 855 AM PDT WED MAY 19 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON. .DAY ONE...TODAY AND TONIGHT A TROUGH OF LOW PRESSURE REMAINS OVER EASTERN OREGON AND WASHINGTON TODAY...WITH PLENTY OF MOISTURE AND INSTABILITY REMAINING OVER THE AREA. SHOWER ACTIVITY WILL INCREASE THROUGHOUT THE DAY...AND THUNDERSTORMS ARE POSSIBLE. WHILE THUNDERSTORMS ARE POSSIBLE ANYWHERE THROUGHOUT THE REGION TODAY...SOME OF THE STORMS MAY BECOME STRONG AND PRODUCE WIND GUSTS TO 50 MPH AND HAIL PRIMARILY NORTH OF THE STATE LINE IN WASHINGTON. MODERATE TO HEAVY RAIN MAY ALSO ACCOMPANY THESE THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY UNSETTLED WEATHER WILL CONTINUE OVER THE REGION...AS THE TROUGH OF LOW PRESSURE REMAINS IN PLACE. ANOTHER SYSTEM WILL MOVE THROUGH THE TROUGH FRIDAY NIGHT THROUGH SATURDAY...BRINGING GUSTY WINDS AND A BETTER CHANCE OF SHOWERS TO THE REGION. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EARLY EVENING PRIMARILY ALONG AND NORTH OF A LINE FROM THE DALLES OREGON TO PENDLETON. WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Pendleton radar (KPDT), 169 km away, was scanning. The volume nearest the first event began at 01:29 UTC.
1 flash flood. Local standard time, as filed.
A weather spotter reported .50 inches of rain in 30 minutes in Yakima from a nearly stationary storm. This resulted in deep water on 56th Avenue and Summitview in Yakima, with cars stalling out and forcing a lane closure. During the storm, 60 Pacific Power customers lost electricity.
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, May 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: 5404096.