Fri 09 Sept 2011

First image is of the winds aloft at 850 mb (approx 5000 ft). Winds over the state were light except along the coast where the peak was around 20 knots.  Winds had a NNE tendency and should aid any southbound 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 7:37 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 national migration pattern has changed significantly as the last depression dissipates.  Notice how the north east is now lit up.  After a week of SE winds the light variable winds currently over the area allowed bottled up migrants to head south.  The Central and Mississippi flyways are full as well as wind conditions still favor southbound flight. As always check out for a detailed account of the migration scene back east.