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A back-building thunderstorm, commonly referred to as a training thunderstorm, is a thunderstorm in which new development takes place on the upwind side (usually the west or southwest side in the Northern Hemisphere), such that the storm seems to remain stationary or propagate in a backward direction. Though the storm often appears stationary ...
A dangerous rotating column of air in contact with both the surface of the earth and the base of a cumulonimbus cloud (thundercloud) or a cumulus cloud, in rare cases. Tornadoes come in many sizes but typically form a visible condensation funnel whose narrowest end reaches the earth and surrounded by a cloud of debris and dust .
The NWS has the option of adding enhanced wording to severe thunderstorm warnings and update statements issued as a Severe Weather Statement (SVS)—"particularly dangerous situation" (PDS), "severe thunderstorm emergency", or, as used by some Central and Southern Region offices as indicative PDS wording, "this is a very dangerous storm"—when ...
They feature warning alarms that can be set to sound loudly when any National Weather Service tornado or severe thunderstorm watch or warning is issued.-Your smartphone can alert you. Most newer ...
Severe thunderstorms, many packing high winds, will target more than 80 million people in the eastern United States into Monday night, AccuWeather meteorologists warn. The storms will pose a ...
A dangerous weekend unfolded across the lower Mississippi and Tennessee valleys when severe thunderstorms and torrential downpours blasted the region Saturday, endangering lives and property. More ...
This explains why updrafts underneath the base of a cumulonimbus are often laminar. This phenomenon is well known by glider pilots. [16] (see below). The phenomenon is enhanced under the weak echo region of a supercell thunderstorm that is extremely dangerous. At approximately 4 kilometres (13,000 ft) these smooth updrafts become suddenly very ...
Winter Tornadoes Are Dangerous. As we've discussed before, several factors make winter severe weather outbreaks dangerous.. Storms move rapidly: Severe thunderstorms can often move at speeds above ...