Terrorism in the Megaton Range?

If the forest fires in California were set by terrorists, that would be terrorism in the megaton range. If 600,000 acreas were scorched and the fuel load is 20 tons/acre and the energy release from wood is 4 kCal/gram (typical of carbohydrates) and the energy in a megaton is 10¹² kCal, then the total energy release is 48 megatons so far.

On the other hand, by 911 standards the effects of this are lame. We can barely tell the difference between this and a typical California fire season.