Maritime Polar (mP) Air Atlantic in Summer

In spring and summer, mP air is occasionally observed over the east coast. Marked drops in temperature that frequently bring relief from heat waves usually accompany the influx of this air (fig. 4-1-16). Just as in winter, there is a steep lapse rate in the lower 3,000 feet of this mass.

Stratiform clouds usually mark the inversion. Ceilings are from 500 to 1,500 feet, and the tops of the clouds are usually 1,000 to 2,500 feet. No precipitation occurs from these cloud types and

Figure 4-1-15.Trajectories of mP air over the Pacific in summer.

Figure 4-1-16.Trajectories of mP air over the Atlantic in summer.

visibility is usually good. This air usually does not constitute a severe hazard to flying.

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