I wouldn't have figured Hanna to be the storm to strengthen overnight while Gustav weakened, but there is a reason that intensity forecasting is extremely difficult. Gustav is struggling right now and does not have a terribly organized presentation on satellite or radar. There are no obvious reasons for why it has continued to weaken, other than some possible organizational malfunctions introduced by passing over Cuba or from the still slightly sheared environment. Its window for significant reintensification will be slowly closing throughout the day. Hopefully, that window closes with no major increase in intensity.