Thunderstorms caused local damage and power outages.
Every event with a place to put it. 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 episode as NWS SEW wrote it up.
Thunderstorms caused local damage and power outages.
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 May 13, 8:05 AM PST, 3 hours 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SEATTLE WA 905 AM PDT MON MAY 13 2013 .SYNOPSIS...A COOL UPPER LEVEL TROUGH WILL MOVE THROUGH WESTERN WASHINGTON THIS AFTERNOON AND EVENING. THE TROUGH WILL BRING INCREASING SHOWERS AND ISOLATED THUNDERSTORMS AS WELL AS BREEZY CONDITIONS. AFTER A BRIEF BREAK ON TUESDAY UNSETTLED WEATHER WILL RESUME AND THEN PERSIST INTO THE WEEKEND. && .SHORT TERM...AN UPPER TROUGH WILL MOVE THROUGH WESTERN WA THIS AFTERNOON AND EVENING. THE AIR WILL DESTABILIZE TODAY AS THE PUDDLE OF COLD AIR ALOFT SHIFTS FROM OUT AROUND 130W THIS MORNING TO WESTERN WA LATER THIS AFTERNOON. ISOLATED THUNDERSTORMS ARE IN THE FORECAST AND THIS LOOKS GOOD AS THERE WAS A LIGHTNING STRIKE OFFSHORE IN THE PAST HOUR AND THE AIR SHOULD CERTAINLY BE EVEN MORE UNSTABLE OVER LAND THIS AFTERNOON THAN OUT OVER THE WATER. SHOWERS WILL DECREASE OVERNIGHT AND TUESDAY SHOULD BE DRY OVER MOST OF WESTERN WA...WITH A CHANCE OF SHOWERS MAINLY FOR THE COAST AND MOUNTAINS. THE NEXT WEATHER SYSTEM WILL MOVE INTO THE AREA ON WEDNESDAY...FOR ANOTHER CHANCE OF SHOWERS BUT THIS SYSTEM LOOKS CONSIDERABLY WEAKER THAN THE SYSTEM MOVING INTO WESTERN WA THIS AFTERNOON. .LONG TERM...EXTENDED MODELS IN GOOD AGREEMENT ON THE GENERAL PATTERN FOR THE EXTENDED PERIOD WITH WEAK ZONAL FLOW ALOFT AND THE JET TO THE SOUTH OF WESTERN WASHINGTON. WEAK SYSTEMS EMBEDDED IN THE FLOW TRYING TO SPLIT AS THEY MOVE INTO THE AREA. MODELS NOT REAL CONSISTENT ON TIMING THESE SYSTEMS THROUGH FRIDAY SO WILL STAY WITH THE CHANCE POPS SCENARIO. BOTH THE GFS AND THE ECMWF KEEP THE SYSTEM OVER THE WEEKEND A LITTLE MORE INTACT SO HAVE LIKELY POPS ALONG THE COAST BUT WILL CONTINUE WITH THE IDEA OF JUST CHANCE POPS INLAND. FELTON && .AVIATION...AN UPPER TROUGH WILL MOVE ACROSS WESTERN WASHINGTON LATE THIS AFTERNOON AND THIS EVENING. STRONG SOUTHWEST FLOW ALOFT AHEAD OF THIS TROUGH WILL BECOME WESTERLY THIS EVENING. THE AIR MASS IS MOIST AND WILL BECOME UNSTABLE AS THE TROUGH MOVES THROUGH DURING THE LATE AFTERNOON AND EVENING HOURS. AT THE SURFACE MODERATE TO STRONG SOUTHWEST FLOW WILL DEVELOP AFTER THE TROUGH PASSES. CEILINGS RANGE FROM IFR TO VFR BUT THEY SHOULD SETTLE INTO THE MVFR CATEGORY WITHIN A FEW HOURS. LIGHT RAIN AT TIMES WILL BECOME MORE SHOWERY WITH A CHANCE OF THUNDERSTORMS DURING THE 21Z-03Z PERIOD. SHOULD BE A FAIR AMOUNT OF CLEARING TONIGHT WITH VFR CONDITIONS TUESDAY. KSEA...DISCUSSION ABOVE APPLIES. CURRENT IFR CEILING AT KSEA SHOULD NOT LAST LONG AND SHOULD SETTLE AROUND 2K FT. GUSTY SOUTHWEST WINDS WILL OCCUR 18Z-06Z TOPPING OUT AROUND 15G25KT. WINDS AND SHOWERS WILL DIMINISH AFTER 06Z. CHB && .MARINE...A SURFACE TROUGH WILL MOVE THROUGH THE WATERS 18Z-00Z. SOUTHERLY WINDS IN THE SMALL CRAFT ADVISORY RANGE ARE ALREADY OCCURRING ALONG THE COAST AND WILL DEVELOP BY 21Z OVER THE INLAND WATERS. SMALL CRAFT ADVISORIES ARE IN EFFECT FOR ALL WATERS. ISOLATED THUNDERSTORMS ARE FORECAST THIS AFTERNOON AND EVENING. OUTFLOW FROM THUNDERSTORMS MAY RESULT IN GUSTY CONDITIONS. WINDS WILL SUBSIDE LATE TONIGHT THROUGH TUESDAY AS HIGH PRESSURE BUILDS OVER THE AREA. A WEAKER FRONTAL SYSTEM WILL MOVE INTO THE COASTAL WATERS TUESDAY NIGHT GIVING POSSIBLE SMALL CRAFT ADVISORY CONDITIONS ON THE COAST. THE FRONT WILL WEAKEN AS IT MOVES INLAND ON WEDNESDAY. LIGHT TO MODERATE ONSHORE FLOW THURSDAY AND FRIDAY. CHB && .SEW WATCHES/WARNINGS/ADVISORIES... WA...NONE. PZ...SMALL CRAFT ADVISORY ALL WATERS. && YOU CAN SEE AN ILLUSTRATED VERSION OF THE FORECAST DISCUSSION AT WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTML
The Seattle radar (KATX), 106 km away, was scanning. The volume nearest the first event began at 20:00 UTC.
3 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds knocked down trees which caused local power outages and damage. In Edgewood a tree fell on a home.
A tree and power lines fell across cars in a parking lot at Green River Community College in Auburn. Classes were canceled for the rest of the day due to a power outage.
In Silverdale, a tree crashed onto a home injuring the occupant. There were power outages on other parts of the Kitsap peninsula.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2013Every state in 2013This day in weather historyWarnings in Washington, May 2013
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: 453765, 453772, 453787.