A strong marine push combined with thunderstorm outflow produced wind gusts to 54 mph near the Cascade foothills. About 3300 customers lost power from fallen tree limbs on power lines.
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 episode as NWS SEW wrote it up.
A strong marine push combined with thunderstorm outflow produced wind gusts to 54 mph near the Cascade foothills. About 3300 customers lost power from fallen tree limbs on power lines.
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 Jun 4, 2:00 PM PST, 5 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SEATTLE WA 300 PM PDT THU JUN 4 2009 .SYNOPSIS...A MARINE PUSH WILL DEVELOP THIS EVENING AS THERMAL LOW PRESSURE SHIFTS NORTH AND THEN INTO EASTERN WASHINGTON BY FRIDAY. MUCH COOLER MARINE AIR WILL MOVE INTO WESTERN WASHINGTON. AN UPPER LOW IS MOVING INTO CALIFORNIA. WEAK UPPER TROUGHS AND LIGHT ONSHORE FLOW WILL GIVE NORMAL WEATHER FOR THE AREA NEXT WEEK WITH THE BEST CHANCE OF SHOWERS ON TUESDAY. && .SHORT TERM...AT 2PM THE THERMAL TROF EXTENDS FROM NORTH CENTRAL OREGON TO THE NORTH WA COAST. ONSHORE GRADIENTS DVLPG WITH OTH-SEA +5MB ALREADY AND A 25KT SOUTHERLY SURGE IS EXPECTED TO SQUIRT NORTH ALONG THE COAST TONIGHT...WITH SLIES DEVELOPING OVER THE INLAND PTN OF WRN WA BY MIDNIGHT. THERE ISNT A HUGE RESERVOIR OF STRATUS COMING INTO WRN WA TONIGHT...BUT IT IS STILL A STRONG PUSH. FOR THE TEMP FCST FRIDAY I HAVE SOMETHING CLOSE TO WHAT THE UW 4KM WRFGFS SHOWS...60S COAST AND NEAR THE WATER TO 70S IN THE SEATTLE METRO AREA. MID LVL CLOUDS OVER THE SRN HALF OF THE CASCADES AND STREAMING INTO SW WA SHOW THE ELY FLOW...WHICH COULD CARRY A FEW TSTMS INTO WRN WA TNGT. AS OF 2PM THE TSTMS ARE STILL JUST OVER OREGON BUT THERE ARE A FEW SHOWERS ALOFT MOVG OUR WAY. THE THERMAL TROF WILL BE SHIFTING NORTH THRU WRN WA LATE THIS AFTERNOON AND THIS EVE AND THE LEADING EDGE OF THE MARINE PUSH MAY HELP GIVE A LITTLE LIFT AS WELL TO TRIGGER SOMETHING...OR A FEW TSTMS MAY DRIFT OFF THE CASCADES THRU TNGT. MARINE AIR CONTINUES TO PUSH INTO THE AREA THRU FRI NIGHT. 19 .LONG TERM...THE EXTENDED CONTINUES TO LOOK LIKE CLIMO IS A GOOD FCST...PTLY TO MSTLY CLOUDY WITH A CHANCE OF SHOWERS. NOT REAL HIGH POPS ARE JUSTIFIED YET...BUT THE GFS HAS A WEAK UPPER TROF INTO THE REGION TIMED FOR TUESDAY AND SO I INCREASED THE POPS A BIT FOR TUE AND TUE NIGHT. TEMPS AVERAGE...WHICH FOR SEATTLE IS A MAX OF 70F. 19 && .AVIATION...LIGHT SOUTHEASTERLY FLOW ALOFT OVER WESTERN WASHINGTON WILL BECOME MORE NORTHEASTERLY TONIGHT. OFFSHORE AND NORTHERLY SURFACE FLOW WILL BECOME MORE ONSHORE AND SOUTHERLY TONIGHT. A SURGE OF MARINE MOISTURE WILL MOVE NORTH ALONG THE COAST THIS EVENING AND INLAND FROM THE SOUTHWEST TONIGHT. THIS WILL BRING IFR CEILINGS UNDER MARINE STRATUS TO MOST OF THE INTERIOR BY 15Z. THE AIR MASS IS MODERATELY UNSTABLE AND SOME MID AND UPPER LEVEL MOISTURE IS SLOWLY INVADING FROM THE SOUTH. ISOLATED THUNDERSTORMS COULD DEVELOP OVER THE SOUTHERN ZONES THIS EVENING. SHOWERS ARE ALSO POSSIBLE. KSEA...WINDS CURRENTLY OUT OF THE NORTH 8-12 KT WILL SWITCH TO SOUTHERLY AROUND 03Z. THERE COULD BE A FEW HOURS OF 10-15 KT DURING THE HEIGHT OF THE MARINE SURGE...PROBABLY DURING THE PERIOD 09Z-15Z. IFR STRATUS LIKELY AROUND 12Z...EVAPORATING 18Z-20Z. CHB && .MARINE...MODELS HAVE RESOLUTELY KEPT WESTERLY GRADIENTS DOWN THE STRAIT WEAK TONIGHT...WHILE INCREASING THE SW GRADIENTS ALONG THE COAST AND INLAND. ACTUAL GRADIENTS ARE STILL OFFSHORE THOUGH OTH-SEA IS STRONGLY POSITIVE. UPSHOT IS A RETHINK OF EARLIER IDEAS. SMALL CRAFT ADVISORY WESTERLIES IN THE STRAIT ARE UNLIKELY TONIGHT AND HAVE ENDED THAT ADVISORY. ON THE OTHER HAND SMALL CRAFT ADVISORY SOUTHERLIES ARE LIKELY LATER TONIGHT ON THE COAST AND HAVE PUT AN ADVISORY UP THERE. AFTER MIDNIGHT THERE WILL BE A SURGE OF MARINE MOISTURE INTO THE SOUTHWEST INTERIOR THAT SHOULD CARRY ALL THE WAY THROUGH PUGET SOUND BY MORNING AND POSSIBLY INTO THE NORTHWEST INTERIOR DURING THE MORNING. FOR NOW HAVE KEPT WINDS IN THE 10-20 KT RANGE BUT A BRIEF BURST OF STRONGER WINDS IS POSSIBLE. ON FRIDAY THE WESTERLY GRADIENT SHOULD INCREASE DOWN THE STRAIT AND 15-25 KT OR EVEN STRONGER IS LIKELY THERE FRIDAY AFTERNOON AND EVENING. THE PATTERN OF HIGH PRESSURE OVER THE OFFSHORE WATERS AND LOWER PRESSURE EAST OF THE CASCADES WILL CONTINUE OVER THE WEEKEND AND MONDAY...GIVING MODERATE ONSHORE FLOW. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...HEAT ADVISORY CENTRAL PUGET SOUND AREA TIL 9PM. PZ...SMALL CRAFT ADVISORY COASTAL WATERS. WWW.WEATHER.GOV/SEATTLE FOR AN ILLUSTRATED VERSION OF THE FORECAST DISCUSSION PLEASE SEE WWW.WEATHER.GOV/SEATTLE/GAFD/LATESTWEBAFD.HTML (ALL LOWERCASE)
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
702 PM PDT THU JUN 04 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0655 PM TSTM WND GST WINLOCK 46.49N 122.94W
06/04/2009 E50 MPH LEWIS WA PUBLIC
GUSTY SOUTHEAST WINDS SNAPPED BRANCHES AROUND THE WINLOCK
AREA.
&&
DDAMICOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
748 PM PDT THU JUN 04 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0730 PM NON-TSTM WND GST YELM 46.95N 122.60W
06/04/2009 M54 MPH THURSTON WA TRAINED SPOTTER
THUNDERSTORM OUTFLOW WIND GUSTS TO 54 MPH.
&&
DMERCER2 strong wind. Local standard time, as filed.
A strong marine push combined with thunderstorm outflow produced wind gusts to 54 mph near the Cascade foothills, from Yelm to Issaquah. About 1200 customers lost power from fallen tree limbs on power lines.
A strong marine push combined with thunderstorm outflow produced wind gusts which knocked out power to nearly 5000 customers.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2009Every state in 2009This day in weather historyWarnings in Washington, June 2009
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: 183729, 183730.