Sat 10 Sept 2011

First image is of the winds aloft at 850 mb (approx 5000 ft). Winds over the state were light, 5 to 10 knots.  Winds had a ENE tendency and shouldn’t prove to be too much of a barrier to southbound migrants.  Way up north winds have turned a bit more favorable for Pacific Flyway migrants.

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

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 7:35 pm pdst.

Density was decent and showed reflectivity readings up into the 20 dBz range.  Plenty of new birds should be in the area today.  The heaviest concentrations continue to be east of Portland along the Cascades.

The east winds could set up the right conditions for dragonfly “migration” along the coast.  Specifically the Variegated Meadowhawk (Sympetrum corruptum) “migration”.