oud as you can see with plenty of cleanup still ahead in the mid atlantic more thunderstorms eme expected tonight with temperatures in the 90s for at least the next week. >> cowen: and we are not even notweeks into summer, whitt, thanks a lot. >> for more on the storms and summer heat wave we turn now to toeorologist jeff berardelli, jeff as we were looking at this, it seems as though this is gh ted a derecho, something we callr heard of before, not a tornado, not a hurricane, what is it and why does it cause so much damage. h> it is not a common term but just another way of saying just a very intense squall line of fhunderstorms produced by a big thunlex of thunderstorms moving very fast, and in the case of a yerecho, they can produce winds of 80 to 90 miles per hour and that is what we saw yesterday. >> cowen: so if it is not the heat though and it is drought, especially in the midwest, is that all tied to the same system