One way to do this would be to use some sort of an intermediate state to toggle between the condition. See screenshot at the end of the post.
For (1) use a < symbol and a threshold value. Use the OR operator ('||') to check for an interval.
For (2) use a temporal logic such as after: http://www.mathworks.com/help/stateflow/examples/using-absolute-time-temporal-logic.html?searchHighlight=temporal
e.g. screenshot of logic below:
