Weds 12 Oct 2011

First image is of the winds aloft at 850 mb (approx 5000 ft). West winds at about 20 knots prevalent over most of the northern part of the state.

Second image is of the surface winds and pressure. The low pressure system off the coast of BC that has developed is just hanging out in the Gulf of Alaska.  It seems to have slid a bit further north and weakened a bit which is giving us lighter surface winds and less cloud cover and precipitation.  This will probably give migration ready birds an opportunity to fly lower and in between the showers.

Third image is of the winds aloft at 925 mb (approx 2500 ft). Just thrown in today to show the options the birds have to avoid strong winds.

Fourth image is the animated gif with snapshots every half hour of the base reflectivity above radar station RTX.  The radar is in precipitation mode all night but you can see the birds flying in between the clouds and occasional rain.  Note that they are only seen fairly close to the radar which means they are flying at a lower altitude than usual.  Probably to get out of the stronger winds aloft.

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 6:32 pm pdst.

Good birding!

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