To be fair, though, I don't think the SARS Analog archive goes more recently than the mid-late 2000s (IIRC). I would certainly love to see more recent additions to it so that we can perhaps get a better idea of storm environment analogs and go from there.
"COW" is the acronym for "
C-band Doppler
On
Wheels", and are basically (as the name implies) DOW trucks equipped with C-band (~5 cm wavelength) radar antennas.
Here's a paper that goes into more detail on these and other recent enhancements to the DOW fleet: