STRONG THUNDERSTORM - A thunderstorm with winds gusting at or over 38 MPH but not as high as 58 MPH. If a thunderstorm has hail less than 3/4", it must also be classified as a strong thunderstorm.
The central dense overcast is the concentrated area of strong thunderstorm activity near the center of a tropical cyclone;[10] in weaker tropical cyclones, the CDO may cover the center completely.
Very Unstable - heavy to strong thunderstorm potential
Light Icing: The rate of ice accumulation that may create a problem if the flight is prolonged in this environment (over one hour).
Very Unstable, Heavy/strong thunderstorm potential
-3 to -5
Unstable, Thunderstorms probable
0 to -2
Marginally Unstable, Thunderstorms possible
It is a stability index used to determine thunderstorm potential.
SEVERE THUNDERSTORM: A strong thunderstorm with wind gusts in excess of 58 mph (50 knots) and/or hail with a diameter of 3/4" or more. A thunderstorm with winds greater than 39 mph and/or hail greater than " inch is defined as approaching severe.
For example, if the rising parcel has an temperature of -5°C when it reaches 500 millibars, but the actual temperature at 500 millibars is -11°C, then the lifted index is -6 Kelvin (or K) indicating the potential for strong thunderstorms.
Squall Line - A line of thunderstorms sometimes several hundred miles long that can produce strong thunderstorms and sometimes severe weather.
Stable Air - Air that is colder than its surroundings and is resistant to upward movement.
Dryline-A region where there is a strong gradient in dew point temperatures. It is often found in a region where strong thunderstorms develop.
Frequency- Number of cycles or sound waves per second ...
In this example (b), shades of yellow and orange represent infrared energy emissions consistent with strong thunderstorms.
It usually spreads in all directions, but due to the upper level wind flow most of the anvil spreads in the direction of the upper level winds. Anvils occur with severe and strong thunderstorms as the air rising in the updraft reaches the ...
Often times these clouds escape from the main air flow aloft and may linger over areas of the landscape already saturated by the earlier passage of strong thunderstorms. They typically only effect small areas ranging up to less than 100 square miles.
 See also: Cloud, Thunderstorms, Temperature, Thunderstorm, Thunder
  
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