Can wind shear conditions be identified visually?
Can you see wind shear?  Nope, but you can sometimes see indications of it.  According to Airbus, windshear is usually associated with the following weather situations (photos found on Google images by me and are clickable to take you to the source):


Jet streams

Mountain waves

Frontal surfaces


Thunderstorms and convective clouds (and I added virga here too)

 

Microbursts.




Avoid these at all cost!  Actually, that's the easy part.  The windshear without the visible signs is more the issue, and csatlos's answer does a good job of telling you what to look for during flight (especially takeoff and landing when you are low and slow).