Weather fronts separate air masses with different density (temperature and/or ...
accepted form of air mass classification, though others have produced more ...
Cold fronts may feature narrow bands ...
This air mass produces weather that is cold in winter, cool in summer, with low ....
The most severe thunderstorms may have hail 1-inch or more in diameter ...
air masses are important because the unequal heating of the earth causes
movement of huge volumes of air. air masses formed over cold areas stay cold ...
Six basic types of air masses affect the weather of the British Isles. ... The most
severe weather usually occurs when dry-cold continental polar air ... The former
becomes more stable, and the latter more unstable. ... In summer tropical
maritime air often produces warm weather with abundant sunshine in the
The air mass is more shallow than the continental Polar air mass. ... This situation
produces northeasters, (winds from a northeast direction), for areas north ... and
the interaction may produce some interesting, and sometimes severe, weather.
This air mass results from the warm waters of the Gulf of Mexico and Gulf Stream.
... If this air advects over PBL mT air, the severe thunderstorm threat increases ...
Tropical and Polar areas tend to have more uniform weather throughout the ...
Nov 28, 2010 ... Severe Weather ... Thunderstorms form when an air mass becomes so unstable
that it overturns ... The updrafts in thunderstorms can be very strong -- 50 knots or
more -- which can help support the weight of hailstones as they grow. Such
updrafts cause extreme turbulence for aircraft, which will only fly ...
SECTION 3 - Thunderstorms and Severe Weather Spotting ... Where the air
masses collide, the less dense air (warmer or more humid) will rise over the other
. ... This sudden expansion and contraction of air molecules produces the sound
Air mass thunderstorms typically are associated with warm, humid air in the
summer .... Gust - A rapid fluctuation of wind speed with variations of 10 knots or
more ..... Severe Thunderstorm - A thunderstorm that produces a tornado, winds
of at ...
Dec 17, 2013 ... Air masses may extend 1600 km or more across Air masses are ... The advance
of which type of air mass produces most cold fronts ... In which season do middle-
latitude cyclones typically generate the most severe weather in ...