It's going to be a long night for our Cajun Cousins; keep them in your thoughts and prayers. Isaac will take its sweet time meandering along the Louisiana coast tonight, bringing torrential downpours and destructive storm surge across Alabama, Mississippi and southeast Louisiana. It is still packing 80 mph winds close to the core of the storm as it slowly ambles to the northwest at 8 mph. The location of where the storm is making the landfall is key. The places with the highest risk for surge are the north and east of where the center is crossing the coast. Additionally, the slow movement of the storm means that the tropical storm force winds will blow for up to 12 hours or more in some places. The combination of heavy rain and wind will likely topple trees and power lines. Already roads are impassable and tens of thousands are without power as I write this.
Here's the slow track, which may be updated at 10 pm:
One of the reasons for the storm's slow down is a ridge of high pressure that sits across Oklahoma and stretches back into Texas and the Rockies. Isaac's northward motion is blocked by that ridge and some computer models even suggest that the ridge may back up. That scenario would allow the storm to possibly drift toward the Texas border instead of just moving northward through Louisiana.
At the very least, we should see increased wind out of the northeast tomorrow on the order of 20-25 mph especially east of I-45. Those breezy off shore winds prompted the NWS to issue a small craft advisory for Galveston Bay and the offshore waters. Also, depending on where the storm ends up, some of the feeder bands may wrap around into east Texas. That means that places like Beaumont, Liberty and Winnie may see some rain Wednesday. A tropical storm watch is in effect for Orange and Jefferson counties: