Andrea 2007 was pretty banal as tropical activity goes. It wasn't particularly organized, it didn't have much of a huff and puff, and it generally wandered around over the ocean aimlessly and harmlessly. It was, however, a particularly photogenic storm. Check out the water vapor imagery below as a dry (the brown area) fat cold front barges its way south, pushes the moist tropical air out of its way, then coils around and envelops little Annie:
|Radar loop from 1145z May 6, 2007 to 0115z May 8, 2007 (Wikipedia)|
|Same loop as above, slowed down and enlarged 2x (Created by me with two lines of imagemagick)|
|Surface Analysis chart for 0000z May 6, 2007|
Most people tend to think of weather as local: if it's raining on their head, it might as well be raining everywhere, so local is about 10 miles. Pilots have a different definition of local, since we can be in another state in an hour, so we look at local as about 100 miles. As this example shows, weather patterns have yet another definition of local, which is about 1000 miles! Believe it or not, the weather in Ohio is heavily influenced by what is going on in the Gulf of Mexico south of Louisiana. The wind currents there can shoot bad weather up our way like a baseball being shot out of a batting cage machine, they can deflect it to the south of us by tugging a front down, they can intensify or interfere with fronts coming east off of the Great Plains, or any number of things. My next post will get into those large-scale patterns with yet another animation.
I'll leave you with another pretty picture of Andrea. This one even has some huge smoke coming from some brush fires in northern Florida to make it even more interesting:
|Subtropical Storm Andrea on May 10, 2007 (Wikipedia)|