Thunderstorms, Hurricanes and Tornadoes Thunderstorm Facts Right now

Thunderstorms, Hurricanes and Tornadoes Thunderstorm Facts  Right now

Thunderstorms, Hurricanes and Tornadoes Thunderstorm Facts Right now there are about 2,000 thunderstorms occurring worldwide

There are about 45,000 thunderstorms per day!! U.S. gets 100,000 per year! Severe Thunderstorms

Torrential Downpours Strong winds at greater than 58 mph Hail inch diameter (or larger) Frequent lightning

Severe Thunderstorm Watch Issued by National Weather Service This means that conditions are favorable for a thunderstorm Length is multiple hours.

Severe Thunderstorm Warning Issued By Local Weather Service Means a severe storm has been spotted by doppler radar

Usually only an hour Lightning Types of Lightning

Cloud-to-ground (CG) Intra-cloud (IC) Ribbon lightning Sheet lightning

Heat lightning Ball lightning Cloud-to-ground (CG) Lightning

Intra-cloud (IC) Lightning Ribbon Lightning Sheet Lightning

Heat Lightning Ball Lightning

Lightning Safety Stay indoors, away from doors and windows. Do not take baths or showers. Do not use phones with cords.

Cars are pretty safe Thunder

How Far Away Was That Lightning? When you see the flash, start counting seconds. When you hear the thunder, stop counting. Every 5 seconds is equal to 1 mile.

Tornadoes F-Scale

F0 Light damage F1 Moderate damage F2 Considerable damage F3 Severe damage

F4 Devastating damage F5 Incredible damage (Auntie Em!) Tornado Watch Conditions are favorable for a tornado to

form Tornado Warning A tornado has formed.

Tornado Safety

Get indoors and stay there Stay away from doors and windows Get to lowest level possible Dont get near things that can fall on you

When to expect Hurricane season is June through November Peak is in September Formation of Hurricanes

Tropical Depression Tropical Storm Hurricane Tropical Depression

Cluster of organized thunderstorms Not very compact Sustained winds of at least 30 mph Given a number

Tropical Storm

Winds above 39 mph Given a name More organized If hits land, most damage caused is by

rainfall. Hurricane

Winds over 74 mph Well defined center of circulation Eye Wall

Damage from includes: Wind Storm surge Rain

Pressure in hurricane A way to tell strength of hurricane is by its pressure Measured in millibars (mb) Higher pressures are weak, lower are

stronger Naming System

A list of names from A-W (excluding Q) Alternate from male to female

6 lists, repeated in cycle Big name storms replaced Saffir-Simpson Scale Designed by Herbert Saffir and Bob

Simpson Divides hurricanes into categories based on maximum sustained winds. Category 1

Winds- 74-95 mph

Storm Surge- 4-5 ft. Pressure- 986mb Damage- mobile homes, trees, minor costal flooding

Category 2

Winds- 96-110 mph Storm surge- 6-8 ft. Pressure- 965- 979 mb Damage- Some roof and window. Damage

to piers on coast. Small crafts. vegetation Category 3

Winds- 111-130 mph Storm surge- 9-12 ft.

Pressure- 945-964 mb Damage- structure damage to homes and buildings. Mobile homes destroying. Major coastal flooding with a potential for inland flooding.

Category 4

Winds 131-155 mph Storm surge- 13-18 ft. Pressure- 920-944 mb Damage- Complete roof damage. Major

erosion to beaches. Further inland flooding. Category 5

Winds- Greater than 156 mph Storm surge- over 19 ft.

Pressure- less than 920 mb Damage- Roofs torn off, buildings collapse, major inland flooding. Hurricane Watch

A hurricane poses a possible threat within the next 36 hours Hurricane Warning Hurricane conditions expected within 24

hours Most Damaging Storms

1) Katrina (2005)- 75 billion

2)Andrew (1992) 34 billion 3)Charley (2004)- 14 billion 4) Ivan (2004)- 13 billion 5) Wilma (2005)- 12 billion ..9) Agnes 1972 8.6 billion

Hurricane Safety Best plan is to evacuate Towns have voluntary evacuation during a watch, and some switch to mandatory during a

warning. Plan early in advance IF you choose to stay

Board all windows Prepare Flashlights, avoid candles Stay tuned to radio Stay indoors

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