Sat 20 Aug 2011

First image is of the winds aloft at 850 mb (approx 5000 ft). Winds over the state were light with some strong winds out of the east down the gorge. Offshore flow was present up and down most of the coast. Off the coast the northerly winds continue.  These winds were up to  20 knots — again i’m not sure if that will impact terrestrial migration.  From the reflectivity it doesn’t look like very much.

Second image is a snapshot of the base velocity showing north to south directionality at a peak of 20 to 25 knots.

Third image is an animated gif with snapshots every half hour of the base reflectivity above radar station RTX.  Animation runs from around 8:00 pm pdst yesterday evening through 5:00 am pdst this morning. (Click on the thumbnails to view the full-sized images and animation.)

Sunset last night was at 8:12 pm pdst.

Density is pretty light.

As a side note; the easterly winds down the gorge are speculated to play a part in moving inland Variegated Meadowhawks  (Sympetrum corruptum) out to the coast where they have been seen to congregate in large numbers and have a southerly directional movement in the fall. You can read more about this here.