HurricanesHurricanes

What Is A Hurricane?What Is A Hurricane?•Hurricanes are Hurricanes are

intense intense tropical tropical cyclones with a cyclones with a maximum maximum sustained sustained speed of at speed of at least 65 knots least 65 knots (74mph).(74mph).

By Any Other NameBy Any Other Name

•Hurricanes form in the Hurricanes form in the warm waters of the world.warm waters of the world.

•In the Eastern Pacific they In the Eastern Pacific they are called are called typhoons.typhoons.

•In the Indian Ocean In the Indian Ocean they’re called they’re called cyclones.cyclones.

By Any Other NameBy Any Other Name

•They usually form from some They usually form from some old low pressure system or old low pressure system or tropical wave.tropical wave.

•If the wave develops If the wave develops circulation and reaches winds circulation and reaches winds of 35knots( 39mph ) they are of 35knots( 39mph ) they are tropical storms and named.tropical storms and named.

Physical Make-upPhysical Make-up

•Hurricanes Hurricanes have a have a diameter of diameter of less than 100 less than 100 miles to over miles to over 500 miles.500 miles.

Physical Make-upPhysical Make-up•They have a They have a

more or less more or less circular “eye” circular “eye” which may be which may be well defined in well defined in stronger stronger storms.storms.

Hurricane PowerHurricane Power

•Hurricanes Hurricanes are ranked are ranked on a 1-5 on a 1-5 scale called scale called the Saffir-the Saffir-Simpson Simpson Scale.Scale.

Hurricane PowerHurricane Power•A 1 would be a A 1 would be a

minimal minimal hurricane with hurricane with winds 74-95 mph.winds 74-95 mph.

•A 5 is A 5 is catastrophic with catastrophic with winds 155 mph+winds 155 mph+

Danger from Danger from HurricanesHurricanes

•In the US, In the US, most people most people that die from that die from hurricanes are hurricanes are killed by fresh killed by fresh water water flooding. flooding.

Danger from Danger from HurricanesHurricanes

•Worldwide, Worldwide, most die most die from the from the storm surge.storm surge.

•Why would Why would that occur?that occur?

Storm SurgeStorm Surge•To Answer that question To Answer that question let’s take a look at storm let’s take a look at storm

surge.surge.

Think You Know Why?Think You Know Why?In the US our In the US our warning warning system is so system is so good that good that people along people along the coast the coast know when know when the storm is the storm is coming.coming.

Think You Know Why?Think You Know Why?

In many In many parts of the parts of the world world people may people may not know to not know to leave.leave.

Think Back!Think Back!

•Fresh water Fresh water flooding was flooding was the number the number one cause of one cause of death in the death in the United States.United States.

•Do you Do you remember remember from the from the graph the graph the number two number two cause of cause of death by death by hurricane in hurricane in the U.S.?the U.S.?

THE WIND!THE WIND!

•Take a look Take a look at this piece at this piece of wood that of wood that was driven was driven into the into the palm tree.palm tree.

THE WIND!THE WIND!

•Flying Flying objects in objects in the wind the wind can be very can be very dangerous. dangerous.

Here Are A Few Hurricane Here Are A Few Hurricane Questions!Questions!

•When is the When is the official official starting date starting date for the for the Atlantic Atlantic Hurricane Hurricane season?season?

Here Are A Few Hurricane Here Are A Few Hurricane Questions!Questions!

•What is the What is the last day of last day of the the hurricane hurricane season?season?

THE ANSWER!THE ANSWER!

•The Atlantic The Atlantic Season begins Season begins June 1June 1stst and ends and ends on November on November 3030thth..

•BUT! Atlantic BUT! Atlantic hurricanes have hurricanes have occurred in every occurred in every month but one!month but one!

During Which Month Do We During Which Month Do We Have The Largest Number Of Have The Largest Number Of

Hurricanes?Hurricanes?•On the average, On the average,

there are 10 there are 10 named storms a named storms a year. Historically, year. Historically, September September is the is the month with the month with the most named most named storms. storms.

Hurricanes That Have Hurricanes That Have Impacted Our Area.Impacted Our Area.

The Great Atlantic Hurricane of The Great Atlantic Hurricane of 19441944

•This storm had This storm had reported reported sustained winds sustained winds of 134mph at of 134mph at the mouth of the mouth of the Chesapeake the Chesapeake BayBay

Hurricane Hazel in 1954Hurricane Hazel in 1954

•Hurricane Hazel Hurricane Hazel caused a great caused a great deal of damage deal of damage to the Tidewater to the Tidewater area with area with sustained winds sustained winds in excess of in excess of 100mph.100mph.

Hurricane Camille in 1969Hurricane Camille in 1969•One of the Few One of the Few

Category 5 Category 5 storms to hit storms to hit the US.the US.

•113 died in 113 died in Virginia due to Virginia due to the heavy rains the heavy rains and flash and flash floods.floods.

•Richmond was Richmond was flooded!flooded!

Hurricane Floyd in 1999Hurricane Floyd in 1999•Hurricane Hurricane

Floyd caused a Floyd caused a great deal of great deal of flooding and flooding and power outages power outages from fallen from fallen trees.trees.

•Notice the rain Notice the rain bands.bands.

Bonus Question!Bonus Question!

•What Two Things Will Kill Or What Two Things Will Kill Or Weaken A Hurricane?Weaken A Hurricane?

•Think About The Things That Think About The Things That Are Needed For A Hurricane Are Needed For A Hurricane To Form.To Form.

The Answer!The Answer!

•Cold Water AND Cold Water AND Land!Land!

Now A Quick Review!Now A Quick Review!

•A hurricane must have a A hurricane must have a sustained wind of at least ___ sustained wind of at least ___ mph.mph.

•7474

#2#2

•Hurricanes are called _______ Hurricanes are called _______ in the Eastern Pacific.in the Eastern Pacific.

•TyphoonsTyphoons

#3#3

•What is the name of the What is the name of the hurricane intensity scale?hurricane intensity scale?

•Saffer-SimpsonSaffer-Simpson

#4#4

•What aspect about hurricanes What aspect about hurricanes kills the most people in the kills the most people in the

U.S.?U.S.?

•Freshwater FloodingFreshwater Flooding

#5#5

•When does the Atlantic When does the Atlantic Hurricane season officially Hurricane season officially begin?begin?

•June 1stJune 1st

The Last Question!The Last Question!

•What Category 5 hurricane What Category 5 hurricane killed over 100 people in killed over 100 people in

Virginia?Virginia?

•CamilleCamille