Why do some clouds produce lightning and not others?
How Powerful is Lightning?
Each spark of lightning can reach over five miles in length, soar to temperatures of
approximately 50,000 degrees Fahrenheit, and contain 100 million electrical volts.
Lightning Is A Random, Chaotic And Dangerous Fact Of Nature
At any given moment, there are 1,800 thunderstorms in progress somewhere on
the earth. This amounts to 16 million storms each year! Scientists that study
lightning have a better understanding today of the process that produces lightning,
but there is still more to learn about the role of solar flares on the upper
atmosphere, the earth's electromagnetic field, and ice in storms. We know the
cloud conditions needed to produce lightning, but cannot forecast the location or
time of the next stroke of lightning. There are lightning detection systems in the
United States and they monitor an average of 25 million flashes of lightning from
the cloud to ground every year!
Lightning has been seen in volcanic eruptions, extremely intense forest fires,
surface nuclear detonations, heavy snowstorms, and in large hurricanes,
however, it is most often seen in thunderstorms. A thunderstorm forms in air that
has three components: moisture, instability and something such as a cold front to
cause the air to rise. Continued rising motions within the storm may build the
cloud to a height of 35,000 to 60,000 feet (6 to 10 miles) above sea level.
Temperatures higher in the atmosphere are colder; ice forms in the higher parts
of the cloud.
Ice In The Cloud Is Critical To The Lightning Process
Ice in a cloud seems to be a key element in the development of lightning. Storms
that fail to produce quantities of ice may also fail to produce lightning. In a storm,
the ice particles vary in size from small ice crystals to larger hailstones, but in the
rising and sinking motions within the storm there are a lot of collisions between
the particles. This causes a separation of electrical charges. Positively charged
ice crystals rise to the top of the thunderstorm, and negatively charged ice
particles and hailstones drop to the middle and lower parts of the storm.
Enormous charge differences (electrical differential) develops.
How Lightning Develops Between The Cloud And The Ground
A moving thunderstorm gathers another pool of positively charged particles along
the ground that travel with the storm. As the differences in charges continue to
increase, positively charged particles rise up taller objects such as trees, houses,
and telephone poles. Have you ever been under a storm and had your hair stand
up? Yes, the particles also can move up you! This is one of nature's warning
signs that says you are in the wrong place, and you may be a lightning target!
The negatively charged area in the storm will send out a charge toward the ground
called a stepped leader. It is invisible to the human eye, and moves in steps in
less than a second toward the ground. When it gets close to the ground, it is
attracted by all these positively charged objects, and a channel develops. You see
the electrical transfer in this channel as lightning. There may be several return
strokes of electricity within the established channel that you will see as flickering
lightning.
Thunder
The lightning channel heats rapidly to 50,000 degrees. The rapid expansion of
heated air causes the thunder. Since light travels faster than sound in the
atmosphere, the sound will be heard after the lightning. If you see lightning and
hear thunder at the same time, that lightning is in your neighborhood!
Negative Lightning And Positive Lightning
Not all lightning forms in the negatively charged area low in the thunderstorm
cloud. Some lightning originates in the cirrus anvil at the top of the thunderstorm.
This area carries a large positive charge. Lightning from this area is called
positive lightning. This type is particularly dangerous for several reasons. It
frequently strikes away from the rain core, either ahead or behind the
thunderstorm. It can strike as far as 5 or 10 miles from the storm, in areas that
most people do not consider to be a lightning risk area. The other problem with
positive lightning is it typically has a longer duration, so fires are more easily
ignited. Positive lightning usually carries a high peak electrical current, which
increases the lightning risk to an individual.
For more on the science of lightning, see the NOAA National Severe Storms
Laboratory
How Powerful is Lightning?
Each spark of lightning can reach over five miles in length, soar to temperatures of
approximately 50,000 degrees Fahrenheit, and contain 100 million electrical volts.
Lightning Is A Random, Chaotic And Dangerous Fact Of Nature
At any given moment, there are 1,800 thunderstorms in progress somewhere on
the earth. This amounts to 16 million storms each year! Scientists that study
lightning have a better understanding today of the process that produces lightning,
but there is still more to learn about the role of solar flares on the upper
atmosphere, the earth's electromagnetic field, and ice in storms. We know the
cloud conditions needed to produce lightning, but cannot forecast the location or
time of the next stroke of lightning. There are lightning detection systems in the
United States and they monitor an average of 25 million flashes of lightning from
the cloud to ground every year!
Lightning has been seen in volcanic eruptions, extremely intense forest fires,
surface nuclear detonations, heavy snowstorms, and in large hurricanes,
however, it is most often seen in thunderstorms. A thunderstorm forms in air that
has three components: moisture, instability and something such as a cold front to
cause the air to rise. Continued rising motions within the storm may build the
cloud to a height of 35,000 to 60,000 feet (6 to 10 miles) above sea level.
Temperatures higher in the atmosphere are colder; ice forms in the higher parts
of the cloud.
Ice In The Cloud Is Critical To The Lightning Process
Ice in a cloud seems to be a key element in the development of lightning. Storms
that fail to produce quantities of ice may also fail to produce lightning. In a storm,
the ice particles vary in size from small ice crystals to larger hailstones, but in the
rising and sinking motions within the storm there are a lot of collisions between
the particles. This causes a separation of electrical charges. Positively charged
ice crystals rise to the top of the thunderstorm, and negatively charged ice
particles and hailstones drop to the middle and lower parts of the storm.
Enormous charge differences (electrical differential) develops.
How Lightning Develops Between The Cloud And The Ground
A moving thunderstorm gathers another pool of positively charged particles along
the ground that travel with the storm. As the differences in charges continue to
increase, positively charged particles rise up taller objects such as trees, houses,
and telephone poles. Have you ever been under a storm and had your hair stand
up? Yes, the particles also can move up you! This is one of nature's warning
signs that says you are in the wrong place, and you may be a lightning target!
The negatively charged area in the storm will send out a charge toward the ground
called a stepped leader. It is invisible to the human eye, and moves in steps in
less than a second toward the ground. When it gets close to the ground, it is
attracted by all these positively charged objects, and a channel develops. You see
the electrical transfer in this channel as lightning. There may be several return
strokes of electricity within the established channel that you will see as flickering
lightning.
Thunder
The lightning channel heats rapidly to 50,000 degrees. The rapid expansion of
heated air causes the thunder. Since light travels faster than sound in the
atmosphere, the sound will be heard after the lightning. If you see lightning and
hear thunder at the same time, that lightning is in your neighborhood!
Negative Lightning And Positive Lightning
Not all lightning forms in the negatively charged area low in the thunderstorm
cloud. Some lightning originates in the cirrus anvil at the top of the thunderstorm.
This area carries a large positive charge. Lightning from this area is called
positive lightning. This type is particularly dangerous for several reasons. It
frequently strikes away from the rain core, either ahead or behind the
thunderstorm. It can strike as far as 5 or 10 miles from the storm, in areas that
most people do not consider to be a lightning risk area. The other problem with
positive lightning is it typically has a longer duration, so fires are more easily
ignited. Positive lightning usually carries a high peak electrical current, which
increases the lightning risk to an individual.
For more on the science of lightning, see the NOAA National Severe Storms
Laboratory
Lightning Safety Awareness Week
June 18-24, 2006
June 18-24, 2006