Downdrafts begin to form here to counter the updrafts.occurs when the updraft, which provides the required moisture for cloud development, begins to weaken and collapse. Tornado Alley in the US has the highest frequency (Great Plains centered to TX, OK, and KS).is based on when the ingredients for severe weather come together in a particular place, with tornado season moving north and south during the year with the polar jet.is a type of weak whirlwind that forms underneath cumulus clouds over a large body of water, often associated with sea breeze showers and not nearly as strong as a tornado.is a huge electrical discharge that results from the rising and sinking air motions that occur in mature thunderstorms. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Cold, dry weather makes glacial sediments flaky/ready to go airborne. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Thunderstorms that penetrate the cap tend to be explosive. New cells continually form along a more "restrained" gust front, which lifts warm, moist air flowing into the storm. But, with Doppler radar's ability to detect wind velocities, it became clear that more storms than originally thought have rotating updrafts. T/F: a partly-sea-ice-covered Arctic Ocean absorbs more light than a totally-ice-covered Arctic Ocean. Sediments fell back to earth downwind. What is oceanic crust made out of?If limestone is subjected to pressure and heat over time, what do you getDid there used to be volcanoes in what is now the Atlanta area?How do we know there used to be volcanoes in what is now the Atlanta area?What is a good bit of the Geography/Geology Building, e.g. It is computed by comparing the parcel and environmental temperatures at 500 mb. A type of severe weather that is commonly associated with different weather systems like mid-latitude cyclones and hurricanesFor a thunderstorm to develop the atmosphere needs to be completelyOrdinary cell (air mass) , multicell (severe), supercell thunderstormsUsually a short-lived thunderstorm that usually occurs in the summerAir mass thunderstorms usually develop in the _______ because of the unequal heating of the ground surfaceOnce precipitation forms it kills the _______ and the storm dissipatesin south eastern US and the lee ward side of the rocky mountainsAir mass thunderstorms occur often on the lee ward side of the rocky's becauseof contrasting air masses--cT comes as a mT during the summerAir mass thunderstorms occur often in the SE US becauseof the high humidity and has mechanisms that lift air like the sea breeze.up and down drafts can coexist and the storms last longer.small cold front that forms when the down drafts spread on the surfacecloud that forms in association with a gust front and has air spinning around--potential tornadoFor a supercell thunderstorm to form there needs to beWarm and moist air concentrates at the earth's surface so there isno mixing between the surface layer of air and the air above.elongated bands of thunder storms that usually form along the dry linecommonly forms in the summer around Oklahoma, Texas etc.The dry line forms when you have a cT come in contact with an mT and the ____ rises over the ____ creating bad weathervery strong down drafts similar to wind speeds of tornadosThe difference between down drafts and tornados is thatdown drafts are straight down while tornados have rotational winds.Sheet lightning is the most common while close to the ground is theCumulonimbus clouds tend to be _____ at the top and ____ at the bottom.
By 3 p.m. or so, the sun is low enough in the sky for outgoing heat to be greater than incoming.T/F: August football practices should always be held in the morning to avoid the heat of the afternoon. Supercells are much more common in some parts of the United States than others (supercells are more common in the Great Plains than they are in Northeast, for example).The key to the formation of supercells (assuming, of course, that air parcels get a bit of an upward nudge and they can become positively buoyant), is strong vertical wind shear. The corresponding cumulus towers associated with new updrafts are separate from their neighbors, and along the gust front, the newest cumulus tower forms the farthest from the oldest cell (which is likely in the dissipating stage of its life cycle). The impacts can be quite dramatic, and they don't always involve lightning and thunder. Check it out!The real atmosphere sometimes doesn't look as nice and tidy as the idealized schematics I showed in the video, but the bottom line is that, in contrast to single-cell convection, the gust front associated with a multicell thunderstorm repeatedly initiates new cells (often on the storm's southwestern flank). Also the ground below becomes ____.Why is cloud to ground less common than sheet lightning?because of the distribution of charges within a cloudAt a certain point the negative charge tends to move down in steps and forms aWhen positive charges moving up and collide with the charges going down they form aa very small area of low pressure that is characterized by very strong rational winds.After the rotating column of air has turned vertical due to updrafts the column is now aextension of the cumulonimbus cloud that extends towards the earths surfaceWhen calculating the wind speed of the tornado on the _________, you add the spinning to the direction of movement.When calculating the wind speed of a tornado on the _________, you subtract the speed that is due to the movement front the speed that is due to the spinningwind shear, warm moist air, and an unstable or conditionally stable atmosphere
The changes in wind direction and / or speed with increasing height do two main things that increase a supercell's longevity.
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