we get that at our airport too... actually more diverse than a 40degree
swing.. I've seen 180degree differences on a 3700ft runway... wind socks at
both ends pointed at each other, and the mid field wind sock not agreeing
with either..

that means the thermal is in the middle..

BT

"Casey Wilson" wrote in message
...
Another day at Edwards AFB

12 JUL 0928L (1628Z)
Rwy 22: 166/5KTS
166/6MPH
Cross Wind: 7 KTS

Rwy 4: 202/5KTS
202/6MPH

Note the different wind directions at opposite ends of the same runway.