Saturday, May 30, 2009
Clouds on the coast and chaff
Last night a weak disturbance passed by us to the north. As a result the pressure trough over western Washington shifted eastward and the onshore pressure difference increased to near 2 millibars. The result...a weak influx of marine air that brought clouds to the coast, the Strait, and SW Washington. Thus, today will be a few degrees cooler than yesterday, although the clouds will burn back this morning.
A few weeks ago I talked about birds in the weather radar. Yesterday there was something else. Take a look at the weather radar from late yesterday afternoon...looks like showers near the Olympics and over parts of SW Washington. But it was clear. This is good example of chaff from military aircraft. Once in a while the miltary has some kind of exercise off the Oregon coast and release chaff..which blows inland during the next few hours. The radar really picks this up...making it appear that heavy or extensive showers are approaching the region. Why they release this chaff? I can't answer that.
For those of you that are interested, I will be doing 1.5hr show and call in on KCTS9 this Tuesday at 7 PM. They will offering my book and a DVD of the program as part of their pledge drive.
And check out the op-ed section of the Seattle Times tomorrow (Sunday)...there is a piece on the disastrous math decision of Seattle Public Schools. And Issaquah and some other local school district are considering the Discovering Math series. Hope they will think it though first.
Posted by Cliff Mass at 8:58 AM