Selasa, 14 September 2010

The Birds Are Back

The Birds Are Back - Hi, friend Climate and Weather Information, in this article entitled The Birds Are Back, we have prepared this article well and concise to be easy to understand for you to read and can be taken inside information. hopefully the contents of the post that we write this you can understand and useful. okay, happy reading.

I have mentioned before that birds can be viewed on weather radar, and we have a great example tonight.

It seems like the big migrations tend to occur at night (less chance of being caught by predators?). Here is the radar image that shows the amount scattered by targets in the atmosphere (we call this reflectivity) at 5 PM. Not much there, just ground clutter and some weak returns from a few birds, planes, density discontinuities in the atmosphere.

But here is at 8 PM....the sky is filled with echos..the birds!

And which way are the birds going? We can tell, because we have Doppler Radars, which reveal the velocity towards or away from the radar. Cold colors (e.g., green) indicate a velocity towards the radar, warm colors (e.g, yellow) motion away. Clearly, the birds are generally heading to the south or southeast, just what one would expect.

This is is good time for the birds to get going---it is about to get wet here again, as a frontal system makes landfall later tomorrow.

Thank You and Good article The Birds Are Back this time, hopefully can benefit for you all. see you in other article postings.

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