After the tornado in Maryland last night and reading half dozen news articles, not one has mentioned an F-rating. I read the winds were up to 140mph, how high is that on the Fujita scale?
140 mph winds would place it more or less in the F2 category of the Fujita scale. However, the Fujita scale measures more the damage done bythe tornado than wind speed. See this site for a discussion of the Fujita scale and a comparison of wind speed and Fujita rating: