Phenomena somewhat exclusive to the south end of Tscha-kole-chy (whidbey island) is what weather folk refer to as "the convergence zone" or the PSCZ.

Phenomena somewhat exclusive to the south end of Tscha-kole-chy (whidbey island) is what weather folk refer to as “the convergence zone” or the PSCZ. Today’s loop has an example of it, albeit weak, but wanted to point it out tonight.

These will often form during the final days of a storm cycle, after the main event is swept east. If you happen to drive up to Anacortes or Oak Harbor, you’ll sometimes find sunny / breezy conditions up there, only to drive back south into heavy rain and clouds.

The zone often drapes across us toward Mukilteo/Lynnwood and then can meander south toward Tacoma, creating a line of precipitation (or snow), depending on the conditions.

This can sometimes create radical differences in snow and rain totals in the area.

#pscz #psczone #wawx