Thunderstorms light up the skies over parts of Puget Sound... again

SEATTLE -- Well, here we go again.

The greater Seattle area averages roughly five thunderstorms a year, but we're going to try and collect them all within a week as another round of showers and thunderstorms began pushing in Thursday evening and continued on Friday.

One potent cell pushed through the Olympia and Shelton areas late Thursday, with frequent lightning , heavy rain and reports of some hail.

More storms developed overnight and by Friday morning much of the Puget Sound region and Cascade foothills had seen some rain, thunder and lightning.

View the animated Western Washington radar loop for current conditions >>

Any storms Friday could bring frequent lightning, heavy rain, moderately large hail (by our standards) and gusty winds. Storms can form suddenly so don't get caught off guard if you're out overnight.

The storms are courtesy of a potent upper level low pressure center -- the same one that went through last weekend is coming back around for a second shot at the Northwest. Only this time, it picked up some tropical moisture from the remnants of Hurricane Fabio so it's got some decent energy.

The weather will calm as the day progresses and the low pressure center moves off to the east.