A Hebert box (pronounced AY-bear) is one of two regions of the Atlantic Ocean that are useful as predictors of hurricanes that will strike South Florida. They are named for former National Hurricane Center forecaster Paul Hebert, who observed in the late 70s that most strong hurricanes which had struck South Florida since 1900 had also passed through one of these two small 335-mile-by-335-mile square geographic regions.

http://upload.wikimedia.org/wikipedia/commons/a/a7/Hebert_boxes.jpg

Hebert Box #1 is defined as the area between 15-20 degrees North (15-20N) and 60-65 degrees West (60-65W). This box is for only August and September major hurricanes which have hit southeast Florida after passing through the box.

http://villagespires.com/assets/images/hebert%20box%201.gif

Hebert Box #2 is defined as the area between 15-20 degrees North (15-20N) and 80-85 degrees West (80-85W). This box is for only late September and October major hurricanes which have hit south Florida after forming in the western Caribbean Sea and passing through the box.

http://villagespires.com/assets/images/hebert%20box%202.gif

Hebert himself said that a Hurricane does not have to pass through these boxes to hit, but if they do "you better pay attention". The 1935 Labor day Hurricane that devastated the Florida Keys developed west of this box and Hurricane Andrew passed NE of this box, so there are exceptions to the rule.
Source(s):
http://villagespires.com/hebert_boxes.html
http://en.wikipedia.org/wiki/Hebert_box

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