Currently Tropical storm Karen is slowly drifting north bound, it weakened a bit overnight due to dry air but looking at the current satellite convection is refiring around the Center which should prevent her from weakening any farther from dry air and give her a chance to strengthen slightly before landfall.
The storm is going to continue to move NW over the next day or so than take a turn north-northeast, likely making landfall over Western coastal sections of Alabama as a strong tropical storm , the main threat with Karen will be heavy rain and flooding, many of these areas had a very wet summer and so with a widespread 6-8 inches of rain expected flooding is pretty much a certainty , the next concern will be a moderate storm surge, the storm’s approach will be slow which will allow the water to pile up especially on the eastern side of the storm , it shouldn’t be enough to cause a whole lot of damage but still enough to cause problems , and of course thirdly is strong winds sustained tropical storm force, the storm is lopsided with most of the activity on the east side so really if your on the west side of the storm during landfall, don’t expect much more than maybe some rain/wind, highest impacts should be east of the track along coastal Alabama and the Florida Panhandle , and perhaps west coast of Florida, impacts will begin tomorrow and peak later tomorrow through early Sunday, so basically if you live in these areas prepare for a strong tropical storm.
You can see here where the watches and warnings are, the hurricane watch most likely wont verify and should be turned into a tropical storm warning once the storm gets closer, it seems very unlikely this will go above tropical storm status but either way will still have significant impact on this part of the Gulf coast although I don’t think coastal Louisiana/ western portions of Coastal Mississippi as much to worry about because as said above most of the activity is east of the storms center right now, there will be some impact and its a good idea to prepare just in case things change though.
Thereafter we see a cold front coming in from the west, this is what will help Karen turn NE tomorrow , this front will pick her up along with all that tropical moisture and spread it up and down the east coast Sunday night through Tuesday with widespread 1.5-3 inch amounts expected, generally speaking its been dry so this is probably a good thing but this amount of rain will fall pretty quickly so flash flooding could be a concern. There’s still details to iron out like where the axis of heaviest rain will be, that will be determined by where the cold front is when this moisture gets entrained , and also Karen’s strength will be a factor, if she gets stronger than anticipated or weaker than anticipated that would alter rainfall amounts.