"Particularly Dangerous Situation" Tornado Watch Issued for Parts of Oklahoma

I'm following some of the storm chasers in the field today in parts of Kansas and Oklahoma, and it's looking like this could be a bad day for storms in that region.  From the Weather Channel:

#Tornado watch just posted for ctrl/ern OK and far north TX until 10p CT. This is deemed a "particularly dangerous situation" by SPC.

From Reed Timmer, who appears on the Storm Chasers TV show on Discovery Channel:

this is going to be a MAJOR tornado outbreak for OK. biggest in a long time. this is a very dangerous situation

Stay tuned. You can see live streaming video from a number of chasers at the TornadoVideos.net site.

UPDATE:  When I first posted this the Oklahoma radar was completely clear.  Now there are supercells with tornadoes popping up all along the dry line east of Oklahoma City.  Oklahoma went from zero to tornado very quickly.