Orographic thunderstorms are caused by air that is forced up by a mountain or hillside. Air mass thunderstorms are the result of localized convection in an unstable air mass. Frontal thunderstorms occur along boundaries of weather fronts (e.g. cold front).
What is a frontal thunderstorm?
Frontal thunderstorms develop at the boundary (front) between two different masses of air, so they are less dependent on the season of the year than are thermal thunderstorms. Frontal thunderstorms occur over larger areas than thermal thunderstorms, but they are less violent. …
What are the two types of air mass thunderstorms?
There are two basic types of thunderstorms airmass thunderstorm and the severe thunderstorm.
What classifies an air mass thunderstorm?
An air mass thunderstorm is in reference to a relatively weak thunderstorm that usually does not last much longer than an hour, moves slowly and does not produce severe weather. … The main threats from an air mass thunderstorm are lightning and brief heavy rain.
What are the two types of thunderstorms fronts?
There are four types of weather fronts that cause thunderstorms: cold front, warm front, stationary front and occluded front.
Why do ordinary thunderstorms only last about an hour?
Ordinary thunderstorms do not last much longer than an hour because the downdrafts begin to cut off the updrafts. … This occurs when fast upper level winds – such as the jet stream – causes the updrafts to be pull away from the downdrafts. This prevents the downdrafts from cutting off the updrafts.
What are the stages of thunderstorms?
Thunderstorms have three stages in their life cycle: The developing stage, the mature stage, and the dissipating stage.
Why are thunderstorms dangerous?
Thunderstorms are dangerous because they include lightning, high winds, and heavy rain that can cause flash floods. Remember, it is a severe thunderstorm that produces a tornado. … Every thunderstorm produces lightning, which usually kills more people each year than tornadoes.
How do thunderstorms affect humans?
The summer thunderstorm is great theater. But even if you stay indoors, thunderstorms are associated with some adverse health effects. … Researchers have documented thunderstorm-related outbreaks of asthma, and there are hints that storms could cause lung and sleep apnea problems.
What is the difference between air-mass and storm?
Storms arise if the air mass and the region it moves over have different characteristics. For example, when a colder air mass moves over warmer ground, the bottom layer of air is heated. That air rises, forming clouds, rain, and sometimes thunderstorms. … Air masses are slowly pushed along by high-level winds.
What are the 4 types of air masses?
There are four categories for air masses: arctic, tropical, polar and equatorial. Arctic air masses form in the Arctic region and are very cold. Tropical air masses form in low-latitude areas and are moderately warm. Polar air masses take shape in high-latitude regions and are cold.
Why are air mass thunderstorms short lived?
Air-mass thunderstorms are localized, relatively short-lived. They can dissipate after a brief, well-defined life cycle. They extinguish themselves because downdrafts cut off the supply of moisture necessary to maintain the storm. For this reason, air-mass thunderstorms seldom, if ever, produce severe weather.