Exam 19: Weather Patterns and Severe Weather

Divergence aloft helps maintain surface lows.

Which of the following should have the steepest pressure gradient?

An occluded front is depicted on a weather map as a line with semicircles on one side and triangular points on the other side.

Continental polar air masses seldom influence the weather south of the Great Lakes.

Tornadoes most often move TOWARDS what direction?

By international agreement, lesser tropical cyclones are given different names based on the strength of their winds. When a cyclone's strongest winds do not exceed 61 kilometers (38 miles) per hour, it is called a(n) ________.

Discuss the formation and growth of hurricanes. When do they occur, how are they related to low pressure, where do they get their energy, and why do they finally lose strength and dissipate?

Which one of the following statements is NOT true of tornadoes?

In a mature middle-latitude cyclone, the warm front precedes the cold front.

Precipitation associated with a cold front is usually more intense and shorter in duration than precipitation generated by a warm front.

Compare the characteristics (general weather, movement, etc.) of a cold front to a warm front. Also, briefly explain why they exhibit different characteristics.

Usually ________ fronts produce several hours of moderate-to-gentle precipitation over a large region.

This air mass is the source of much of the moisture for precipitation in the central and eastern United States.

The boundary between air masses having different densities is called a(n) ________.

Warm fronts generally have steeper slopes than cold fronts.

Label the air masses on the diagram below.

This air mass may produce an occasional "nor'easter" in the winter.

Which of the following is considered to be a boundary between two different air masses?

A cT air mass is dry and warm.

Tornadoes are cyclonic while hurricanes are anticyclonic.