Northern Hemisphere winds move clockwise around highs. They are marked on maps by lines with semicircular flags extending into the cooler air. These are indicated on maps by lines with triangular flags extending into the warmer air. These are shown on maps by lines with both triangular and semicircular flags. Warm and cold fronts develop.
Cold front begins to overtake warm front, developing an occluded front as warm air is pushed aloft.
Cyclone dissipates after all warm air is pushed aloft and fronts disappear. There are about 2000 thunderstorms in progress at any given time. These often precede tornado development. USA Today 's How Weather Works page.