Bermuda high

The American Meteorology Association defines a "Bermuda high" as

The semipermanent subtropical high of the North Atlantic Ocean, so named especially when it is located in the western part of the ocean. This same high, when displaced toward the eastern part of the Atlantic, is known as the Azores high. On mean charts of sea level pressure, this high is a principal center of action. Warm and humid conditions prevail over the eastern United States, particularly in summer, when the Bermuda high is well developed and extends westward.

Normally the high pressure area is located close to the Azore Islands during the winter and spring, but it shifts to an ocean area close to the Island of Bermuda during the Summer. Since late last week the Eastern United States has been experiencing an exceptional heat wave. In East Tennessee for the last week we have experienced temperatures more typical of June than early spring. Yesterday we hit a record temperature of 86. I look at the weather forecast yesterday, and noted an area of high presure off the Atlantic coast. "Bermuda high," I thought.

The Atlantic high determins the track of hurricanes, The further west the high, the further west the track of hurricanes.Bermuda high explains our heat wave, but what explains the early arrival of the Bermuda high?