I really enjoy tracking tropical systems as they migrate over water. I like to download a printable map with coordinates so I can plot the system and watch its progression. I found this downloadable and printable map here.
In addition, the generic Excel formula using the Great Circle and latitude/longitude coordinates can also be a useful tool for tracking how far the storm is from a particular part of the U.S. mainland (See post below).
In this case, I'm using Corpus Christi TX as a feature for indicating how far away the storm is from land.
The latest coordinates as of 2pm is 24.6N by 90.7W.
According to the coordinates I've used for Corpus Christi, this puts Don about 470 miles away. Allowing for slight fluctuations in forward speed, this puts landfall between 11:00pm Friday night and 2:00 a.m. Saturday morning. Of course, this is subject to change.
The most important thing about Don at this point is it will be a soaker of a system for parts of 'thirsty' Texas. Not quite drought-busting, but this will help a lot.
MS
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