Summer dewpoints can reach the low 80s. Dewpoints above 50 mean that there is enough moisture in the atmosphere to generate thunderstorms. The higher the dewpoint, the easier storms form and the more potent they can become. Intense storms can form at dewpoints of 55 if the right conditions are in place including high convergence values. Current Map US Moisture Convergence Contour plot of the convergence of surface winds weighted by the moisture in the atmosphere represented by the surface specific humidity.
Positive areas represent where winds are converging and thus forcing upward motion.
Negative areas often reflect the presence of sinking motion.