I just started getting my computer programs running and the following earthquake immediately appeared as a match for two of the warning signals. The fact that it was a central U.S. quake also leads me to believe that it might be involved.

2004/08/28 05:06:43 33.22N 86.92W 5.0 2.8 ALABAMA
(NEIS data)

Although it might have had something to do with one or more of the signals I don't think that it could be responsible for most of that warning signal activity. There is probably more to come.