Timing for the Seattle metro area is around 5-7 pm. Steep lapse rates and mean
CAPE values exceeding 1,000 J/kg support strong updrafts across
the area with supercells expected. The Storm Prediction Center
has a Slight Risk of severe thunderstorms west of the Cascades.
The main threats include large hail (up to 2" in diameter),
damaging wind (58 mph or greater) and (to a lesser extent) brief
tornadoes.




