[Scan-DC] wind shear sensor site

[bobjeter1]

As i recall it was near Rt 1 South just north of the beltway. There  
was a discount boat supply I used to frequent. nearby was a school  
with a chain link fence around the yard. The sensor was in a small  
area, also enclosed by chain link, in a corner of that yard. I think  
it was visible from the parking lot of the boating store, but maybe  
from a nearby side street.
It was simply a pole mounted anemometer which had a link to DCA tower.  
Wind speed and direction from all sensor sites were compared to on  
field velocity and direction. Software generated an alarm to the tower  
controller if a fast moving front or outflow from a thunderstorm  
caused a large variation between speed and/or velocity. Many other  
phenomona can cause windshear but not be detected by this system.  
Nowadays Doppler RADAR is the most effective means of detecting  
windshear along with pilot reports. 73, Bob K3RSJ