Isaac will unwind across the Ohio Valley this weekend. In the meantime, heavy rains will move up from Arkansas into southern Missouri where 1-5 inches of rain will fall. In some places, the rain will come to quick and hard causing flash flooding.
Over the weekend, Isaac will unwind across the Ohio Valley and become just a blob of tropical moisture that will produce scattered showers and thunderstorms, some which can cause locally heavy rains.
Leslie is the next storm to watch, but it has several hurdles to overcome for the storm to come back to the East coast. There are at least two troughs that can easily pick up Leslie and take it out to sea. If the sotorm is able to stay clear of both of the troughs, the storm can make it well to the west and get picked up by the bigger trough coming into the East next week. I am not sure right now, but given the current position and speed, I think the storm will miss the connection with the first trough and may get picked up by the second trough, but again, I can see how it misses that one two.
Track of tropical system critical for development, but South Florida could be threatened first.
A new tropical system may be a threat to southern Florida late in the weekend and early next week.
The tropics will produce a storm that could impact the United States coast.
A cold front will be led by severe storms all the way to the Northeast this weekend. Tropics could produce a big storm.
A cold front coming east will produce several days of several weather. Tropics could get active next week as a big high comes down.
A cold front that will bring a change to nicer weather will also produce severe storms in the Plains first Thursday and Friday then eventually in the East this weekend.