There is a little bit of upwelling and mixing in the Gulf from Cindy, but it is confined largely to the north of the Yucutan. Most of the waters north of there to the Louisiana coast are same of the warmest in the basin -- and are especially deep with that warmth -- meaning that when coupled with the relatively fast motion of the storm through to landfall, there is little signature of the storm there.

With Dennis projected to emerge north of Cuba, it is not likely to feel any of the ocean temperature impacts from Cindy. Note that Arlene was too long ago -- a month now -- for its effects to still be around. A tropical storm will only typically impact ocean temperatures for 5 or so days; stronger hurricanes can have longer-lasting impacts, but not a tropical storm.