9. Wind spirals, known as cyclones and anticyclones are common in the mid-latitudes (30°-60°). Winds are so strongly affected by the CF at these latitudes that a series of cyclones and anticyclones are nearly always found there.

The CF increases with increasing wind speed and latitude. Therefore, mid-latitude winds are strongly affected by the CF. In the NH, air in LP areas (cyclones) spirals CCW and inward to the center near ground level, whereas air in HP areas (anticyclones) spirals CW and outward from the center near ground level (Fig. 1). For the SH, air in low pressure areas spirals CW, but still inward near ground level. Guess which way the air spirals in high pressure areas in the SH! Cyclones and anticyclones are typically 600 miles (1000 km) or more in diameter.
 
 

Figure 1. Cyclonic and anticyclonic winds in the Northern Hemisphere. 
Arrows show the winds blowing in and counterclockwise about a low and out and clockwise about a high.