Exam 7: Atmospheric Disturbances

On a NEXRAD computer screen, indications of strong winds flowing towards the radar adjacent to strong winds flowing away from the radar is evidence of a(n) ________ within a thunderstorm and would cause the radar operator to issue a tornado warning.

Which of the following is most closely associated with midlatitude cyclones?

Temperature is usually the key difference between air masses separated by a front.

A typhoon is simply a regional name for a hurricane.

The average directional movement of hurricanes is ________.

A(n) ________ is a high-pressure disturbance of the average flow of the surface westerlies and is so large that it takes more than a day to pass over a location.

Before occlusion, there are two fronts in a midlatitude cyclone.

Extratropical cyclones and anticyclones function as migratory perturbations in the ________.

The cumulus stage is the first stage in the formation of a thunderstorm.

Most tornadoes are classified as ________ on the Enhanced Fujita Scale.

The key to the production of lightning seems to be the build-up of negatively charged ________ at the bottoms of thunderstorm clouds.

The most active phase of a thunderstorm is called the ________ phase.

________ is another name for a hurricane.

Which stage of a thunderstorm is associated with the coexistence of updrafts and downdrafts?

What process seems to weaken hurricanes?

Typical winter cold waves in the eastern United States result from the southward movement of Canadian continental polar air masses.

Which of the following is associated with an increase in pressure after its passage?

A densely-spaced, automated weather observation network such as Oklahoma's Mesonetwork can pick out a weather phenomenon such as a(n) ________ much better than observing networks with less densely-spaced surface observations.

Ninety percent of all reported tornadoes take place in the U.S.

Stable anticyclones act as a ________ to moving cyclones.