NAME: ________________________

Question Limit

of 26 available terms

5 Matching Questions

1. lightening
2. locations where thunderstorms occur
3. spites
4. thunder
5. Derechos
1. a -tropical areas along the ITCZ
-in the US from primarily east of the Rocky Mts w/ Florida being the stage w/ the highest incidence of t storms (#of days per year)
-great plains w/ greatest #per year
2. b -strong linear or "straight-line" winds produced by a t storm
-winds in excess of 58 mph and they reach speeds of
3. c -The sound emitted by rapidly expanding gases along a channel of lightning discharge
- the lightning flash causes the surrounding air T&deg to rise by 8000&deg; to 33,000&deg;C
- air heated quickly, expands explosively and you hear the sound waves = thunder
-thunder travels at a speed of about 1082 feet/sec(the speed of sound), SO it takes about 5 seconds for it to travel 1 mile
4. d -large (up to 57 mi above the cloud top) but short lived electric bursts that rise from cloud tops as lightening occurs below
5. e Flash of light generated by the flow of electrons between oppositely charged parts of a cloud or between the cloud and the ground.

5 Multiple Choice Questions

1. -result of ionization in the air causing tall objects to glow as they emit sparks
2. -charges are separated w/in the cloud as the t storm develops
-positive charges near the top, negative at the base
-lightening is the clouds way of trying to equalize this change diff or imbalance
-after a charge difference builds to millions or hundreds of millions, a lightning stroke occurs to discharge the negative base of the cloud
-may do this by: w/in cloud base lightening, cloud to cloud lightening, cloud to ground lightening)
3. *-pressure at the center of vortex often 90 - 100 mb below the surrounding air == strong pressure gradient (estimated)
- high winds, upwards of 480 kph (300 mph) (estimated)
-travel horizontally at speeds of 45 kph, with avg. distances traveled of 26 km(~ 16 mi)
- average diameters of 150 - 600 meters (490 - 1700 feet)
- form in association with thunderstorms & likely to occur in the area of the T-storm adjacent to area of large hail
4. -raindrops start to fall initiating downdrafts
-process of entrainment, the influx of cool, dry surrounding air helping to fuel the downdrafts
-heavy rains, lightning, thunder, & often hail
5. -can occur in many parts of the world, but dominate in N. America & especially the U.S.
-in U.S. we avg. 750 - 800/yr
-highest concentration in an area stretching from central Texas to Nebraska ("Tornado Alley")
-often associated with hurricanes

5 True/False Questions

1. tornadoes-The sound emitted by rapidly expanding gases along a channel of lightning discharge
- the lightning flash causes the surrounding air T&deg to rise by 8000&deg; to 33,000&deg;C
- air heated quickly, expands explosively and you hear the sound waves = thunder
-thunder travels at a speed of about 1082 feet/sec(the speed of sound), SO it takes about 5 seconds for it to travel 1 mile

2. Cumulus stage-raindrops start to fall initiating downdrafts
-process of entrainment, the influx of cool, dry surrounding air helping to fuel the downdrafts
-heavy rains, lightning, thunder, & often hail

3. The Lightning Stroke(cloud to ground)
- first an invisible step leader of electrons is formed from the cloud base to the ground
- then this path is illuminated as the electrons move back cloud-ward in the return stroke
-the first stroke is often followed by 3 or 4 more strokes within .2 seconds making up the single flash you see

4. mircoburstsmall(less than 2 mi in diameter),severe downbursts are also a potential prob of T storms. Their wind shear is capable of causing air crashes

5. seasonal tornado occurrences-can occur in many parts of the world, but dominate in N. America & especially the U.S.
-in U.S. we avg. 750 - 800/yr
-highest concentration in an area stretching from central Texas to Nebraska ("Tornado Alley")
-often associated with hurricanes