What causes severe weather?

WHAT IS SEVERE WEATHER?

Lightning

▪ Lightning kills 2,000 people each year

▪ Oak trees are struck more than any other tree because they contain more water.

▪ Is lightning helpful?

Lightning & Thunderstorms

▪ Thunderstorms have three main things to them

▪ Wind- a updraft is created and takes warm moist air.

▪ Water- for the rain drops

▪ Heat- heat helps with the positive and negative charges that helps makes lightning

▪ Some times there is even hail in storms

Lightning is a part of thunderstorm. Lightning has both positive and negative charges.

Blizzards

▪ Snow storms

▪ Nor'easter

▪ Safety

Hurricanes

▪ Atlantic hurricane season last from June 1st to November 30th . The end date was October 31st.

▪ Hurricanes were first given names in the 19th century by Clement Wragge, an Australian weatherman.

▪ 2005 there were so many hurricanes that the NHC started to use the Greek alphabet.

What do hurricanes have to do with aftica?

WHAT ARE THE STAGES OF A HURRICANE?

Tropical disturbance

Tropical depression Sandy

HURRICANE SANDY

The Saffir-Simpson scale

Tornados

▪ Tornadoes don’t last more than ten minutes.

▪ Texas is the number one state for killer and the most tornadoes.

▪ Where is tornado ally?

The Fujita Scale and how to find a possible tornado

Tetsuya Theodore Fujita in 1971 created the Fujita scale to rank tornadoes. This helps meteorologists tell the public in how severe the tornado will be.

How is a tornado formed?

▪ Step one: Air is rolled between two different winds.

▪ Step two: This rolled air turns up so it is standing.

▪ Step three: after the air stands up when it touches the ground it becomes a tornado.

Watches, warnings and emergencies

Hurricane

▪ Tropical storm and Hurricane watch- issued 48 hours prior to storm like conditions to take effect.

▪ Tropical Storm and Hurricane Warnning- issued 36 hours till storm hits the area in question.

Tornadoes

▪ Tornado watch- means that there maybe tornadoes in the area

▪ Tornado warning- a tornado has been sighted. Take shelter

▪ Tornado emergency- a large violent tornado is coming get inside.

ACTIVITY

How to make Tornadoes

Things we need…..

•Duct tape

•Water

•2 Two liter bottles each