Just as an aside, Margie, the 85GHz channel on the satellite products available on the NRL's site isn't directly a measure of deep convection. That channel, through various physical processes, is sensitive to ice content at upper levels. Higher ice content leads to lower brightness temperatures (what those images are displaying); note that a brightness temperature isn't an actual temperature, but instead deals with some of the radiative properties of an object.

Generally yes, deep convection will have relatively high ice content...but you'll see moderate to deep convection occasionally appear that does not have very high ice content. In the case of an extratropical cyclone trying to become a tropical cyclone, it's probably better to use the microwave imagery to try to discern developing banding or even eyewall structures and infrared imagery to actually sense the organization of the convection. A lot of this harkens back to these systems primarily being found in the midlatitudes and not the tropics and the properties of convection normally seen here.

In soon-to-be Delta's case, infrared imagery has hinted at a developing eyewall all afternoon, much as was seen with Vince immediately prior to classification, and the microwave image you referenced seems to confirm that with hints of a banding-style eye forming. It's getting close to classification and I would not be surprised to see it classified at 10p ET.