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Lighting - Severe Weather

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Emily Deskin

on 21 September 2015

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Transcript of Lighting - Severe Weather

Alexa, Jasmine, Emily, Mia

Where and when can your severe weather occur?
Lightning can occur just about anywhere. Lightning usually occurs near high tops because that is where the lightning is directed to. Since lightning starts to form in clouds, it is directed to high points. Lightning is always being seen in thunder storms. Lightning is caused in thunderstorms because in lightning is followed by thunder. A flash of lightning followed after thunder illustrates the fact that sound travels slower than light. Using this difference, one can estimate how far away the bolt of lightning by timing the interval between the flash and when hearing thunder. Most lightning occurs during 1pm and 6pm local time.
Have you ever listened to a thunderstorm? Seen a flashing light race across the sky? That flashing light, is called lightning. Lightning is when positive charged particles are formed at the top of the cloud, while at the bottom, negative charged particles form. When the positive and negative charges become strong enough it causes lighting, releasing the buildup of the charged particles. This then creates lightning.

Lightning occurs during spring and summer. It occurs during spring and summer due to the cold dry air from the North and the warm moist air from the South meeting. Lightning is most common in Florida due to their climate.

Central Florida also has one of the highest density lightning flashes in the world. It is surpassed mainly by tropical Africa. Kampala and Uganda that hold the record with three times the thunderstorm days of central Florida. WE referred to,

How is lightning measured
They way scientists measure lightning is more advanced. Here's why. Scientists have discovered a mathematical formula to calculate the strength of a lightning strike. Since lightning kills more people than tornadoes or hurricanes, this is going to help prevent more deaths from lightning strikes. Lightning is able to strike from 10 miles away from the center of the storm. Scientists are now using tall buildings to help them measure the strength of lightning. The tower that scientists are using has two waves that propagate in opposite directions. Both of the waves will contribute to the magnetic field measured by the lightning detection network. This new mathematical formula will help to predict the strength of lightning and to provide better protection for buildings and power lines. This new mathematical formula will help keep people safe and lower the number of deaths because of lightning.
Since the 1980s, cloud-to-ground lightning flashes have been detected and mapped in real time across the entire US by several networks.
In 1994, the networks were combined into one national network consisting of antennas that detect the angle from ground strike points to an antenna (direction-finder antenna), that detect the time it took for them to arrive at an antenna (time-of-arrival method), or a combination of both detection methods. The network was operated by Global Atmopsherics, Inc.
What does lightning damage?

Lightning is bad for houses because it causes very dangerous hazards. Three main lightning hazards for houses are fire danger, power surge damage, and shock wave damage.

Fire Danger- The biggest danger lighting poses to for a house is fire. Wood and other flammable materials are easy to catch fire anywhere an exposed lightning channel with ( or passes through) them. It is most common for a fire to start in an attic or the roof of a house. It starts there because this is where the lightning is followed to and is directed to.
Power surge and damage- If lightning decides to strike any of the homes electrical wiring as a secondary path, the explosive surge can damage even non-electric appliances that are connected. Even if the lightning current takes other path ways to the ground, the electrical system has enough surge to cause significant damage to anything connected to it.
Shock wave damage- One other major source of lightning is produced from the explosive shock wave. The shock waves that lightning creates is what produces thunder, and at close range, it is possible that it can destructive. Lightning can very easily fracture things like concrete, brick, cinder block, and stone. Lightning shock waves can blow out plaster walls, shatter glass, create trenches in soil and crack foundations.
Lightning can be as beautiful as a rose, but beware, it has it's thorns.
Lightning can be as beautiful as a rose, but beware, it has it's thorns.

- Keep and eye on the sky. Look for darkening skies, flashes of light or increasing wind. By doing this, this will help prepare and see how much time you have left or how close the storm is,so you can get into your safe zone.
- If you can hear thunder, you are close enough to the storm so now you will need to hide in a safe place till the storm ends. The safest place to hide during an electrical storm is a house or a building. The metal plumbing and wiring in the walls of the house or building forms a protective barrier. Do not wash your hands, take a shower, wash dishes, or do laundry because this will conduct electricity. Stay away from windows or doors. It is highly dangerous.
How to keep safe from lightning
What is the difference between a watch and a warning?
A watch means that the potential exists for the development of severe thunder storms. It depends on the specific type of watch issued.

A warning requires more immediate action and should be taken seriously. A severe thunderstorm warning indicates that severe weather is in your area or is already occuring.
Emily Deskin
one gallon of water per person per day 3 day supply for evacuation 2 week supply for home.

easy to prepare and non rotting food


disaster kit
4 battery powered radio preferably noaa radio
5 extra batteries
6 first aid kit
7 medications
8 multi purpose tool
9 personal hygiene tools
10 Copies of personal documents (medication list and pertinent medical information, proof of address, deed/lease to home, passports, birth certificates, insurance policies)
11 Cell phones with chargers
12 Emergency contact information
13 Extra money
14 Emergence blanker
15 Maps of the area
16 Medical supplies (hearing aids with extra batteries, glasses, contact lenses, and syringes.
17 Baby stuff
18 Things to keep the kids occupied
19 pet supplies
20 Two way radios
21 Extra set of house keys and car keys
22 Manual can opener
23 Whistle
24 N95 or surgical mask
25 Matches
26 Rain gear
27 Towles
28 Work gloves
29 Tool/supplies to prepare/protect your home
30 Extra clothing, sturdy shoes and hat.
31 Plastic sheets
32 Household liquid bleach
33 Blankets or sleeping bags
Full transcript