Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/19

Click to flip

19 Cards in this Set

  • Front
  • Back
WHAT IS A POLAR FRONT THEORY?
-exlains the life cycle of cyclones
WHAT TWO THINGS ARE NEEDED TO INITIATE THE DEVELOPMENT OF A MID-LATITUDE CYCLONE?
1. stationary front
2. curvature in jet stream
WHAT ARE THE SIX STAGES OF THE POLAR FRONT THEORY?
1. Polar front
2. Frontal wave
3. Open wave
4. wave cyclone
5. occlusion
6. dissipation
WHAT IS THE SECOND STAGE OF THE POLAR FRONT THEORY AND WHAT IS IT CHARACTERIZED BY?
~the second stage of the polar front theory is the frontal wave stage.
~It is characterized by a wavelike kink along the front.
~It is in this stage the warm and cold fronts develop.
WHAT IS THE THIRD STAGE OF THE POLAR FRONT THEORY AND WHAT IS IT CHARACTERIZED BY?
~The third stage of the polar front theory is the open wave stage.
~It marks the development of a warm sector and deepeining low pressure (central pressure drops further).
~Precipitation begins to form along the cold front and ahead of the warm front due to overrunning.
WHAT IS THE FOURTH STAGE OF THE POLAR FRONT THEORY AND WHAT IS IT CHARACERIZED BY?
~the fourth stage is the wave cyclone stage and is characterized by:
-increase in strength (central pressure dropping)
-diminishing warm sector
-widespread precipitation
-development of a comma-shaped cloud structure as seen from satellite imagery
WHAT IS THE FIFTH STAGE OF THE POLAR FRONT THEORY AND WHAT IS IT CHARAVTERIZED BY?
The fifth stage of the polar front theory is the Ooccluson stage.
It is characterized by:
-the storm is most intense as the cold front overtakes the warm front
-clouds and precipitation cover a large area of the mid-latitude cyclone
WHAT IS THE FINAL STAGE OF THE POLAR FRONT THEORY AND WHAT IS IT CHARACTERIZED BY?
The last stage of the polar front theory is called the dissipation stage. It represents the death of the cyclone as the storm collapses into a stationary front.
WHAT IS A THUNDERSTORM?
A storm containing lightning and thunder.
DESCRIBE THE STAGES OF DEVELOPMENT OF AN ORDINARY (AIRMASS) THUNERSTORM
1. cumulus stage:
A parcel of warm, humid air rises, it cools and condenses into a single cumulus cloud or cluster of clouds. There is no lighting or thunder during this stage.
2. MATURE STAGE: The thunderstorm is most intense. Lightning and thunder are present during this stage. Heavy rain falls from the cloud.
3. DISSIPATING STAGE:
Occurs when the updrafts weaken as the gust front moves away from the strom and no longer enhances updrafts.
WHAT THREE CONDITIONS ARE NECESSARY FOR THE DEVELOPMETN OF THUNDERSTORMS?
1. Moisture
2. lifting mechanism
-fronts
-mountains
3. instability
HOW DO SEVERE THUNDERSTORMS DIFFER FROM NON-SEVERE THUNDERSTORMS?
-severe thunderstorms produces hail at least three-quarters of an inch in diameter
-surface wind gusts of 50 knots or greater
-produces a tornado
-usually form in areas with a strong vertical wind shear
WHERE DOES THE HIGHEST FREQUENCY OF THUNDERSTORMS OCCUR IN THE US? WHY THERE?
Thunderstorms are most frequent in Florida. This is because areas with it near the gulf and it has warmth and moisture.
WHY ARE THUNDERSTORMS NOT VERY COMMON ALONG THE WESTERN COAST OF THE US?
In these areas there isn't the moisture necessary to trigger a thunderstorm.
WHAT IS THE PRIMARY SOURCE OF ENERGY FOR THUNDERSTORMS?
Moist air
HOW LONG DO THUNDERSTORMS TYPICALLY LAST?
an hour
WHERE DO THUNDERSTORMS DEVELOP RELATIVE TO THE CENTER OF A CYCLONE (LOW PRESSURE SYSTEM) AND FRONTS?
-south of the low
WHAT IS "WIND SHEAR?"
-rapid changes in wind speed or wind direction
ACCORDING TO THE NATIONAL WEATHER SERVICE, WHAT DEFINES A THUNDERSTORM AS BEING SEVERE?
A thunderstorm is severe if it produces hail at least 3/4 inch in diameter, winds of 58 mph of stronger, or a tornado.