Thunderstorms last night, even more for tonight.
From the National Weather Service:
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
213 PM PDT TUE AUG 12 2014
...SCATTERED TO ABUNDANT LIGHTING THIS EVENING INTO TONIGHT FOR
MUCH OF WESTERN WASHINGTON...
.UPPER LEVEL LOW PRESSURE OVER THE NORTHERN CALIFORNIA COAST WILL
MERGE WITH ANOTHER LOW COMING DOWN FROM THE GULF OF ALASKA...
RESULTING IN SUFFICIENT MOISTURE AND INSTABILITY TO CONTINUE THE
THREAT FOR THUNDERSTORMS OVER MUCH OF WESTERN WASHINGTON THIS
EVENING AND TONIGHT. AS THE ATMOSPHERE BEGINS TO STABILIZE
OVERNIGHT...THE THUNDER THREAT WILL TRANSITION OVER TO SHOWERS.
Cliff Mass has more on his blog: Serious Rain
Here is a real-time display of lightning stikes in the USA. The data is provided by Blitzortung, a European lightning network. I emailed them a few months ago about joining the network. They were out of office for July and most of August -- looking forward to adding this to my weather station (also looking at building a small seismograph).