Checks for Understanding • Interactive online quiz • http://www.pbs.org/teachers/connect/resources/238/preview/
Cyclone, Hurricane, Typhoon… oh my Same type of storm, just form and occur in different oceans! • Hurricane = Atlantic ocean, Eastern pacific including Hawaiian islands • Typhoon = Western pacific • Cyclone = Southern pacific and Indian ocean • Check for understanding: What do we call our storm?
Hurricane Katrina—New OrleansLet’s see what it looks like! http://www.pbs.org/teachers/connect/resources/238/preview/ ^^Video The Storm that Drowned the City—show first (2 minutes preview whole movie, first 8 minutes on predicting and tracking and formation of storm, 27 minutes starts storm hitting footage, 41 minutes starts damage footage from day after) http://www.pbs.org/teachers/connect/resources/238/preview/ ^^Interactive on hurricane formation and tracking!
What Is a Hurricane? • A Hurricane is a large, swirling, low pressure system that forms over tropical oceans. • Has wind speeds of at least 74 mph • In other countries they are also known as typhoons and cyclones What states they hit: http://www.nhc.noaa.gov/prepare/ http://www.brainpop.com/science/weather/hurricanes/
HURRICANES • The wall that is created from the air rising is called an eye wall. • The eyeis the center of the hurricane. • In the eye there are no winds or precipitation. • Only calm spot in the storm. • When hurricanes move over cool water and land they become weaker in intensity
When do hurricane’s happen? • Critical Thinking: What season do you think is Hurricane season in the US? (hint: think about warm waters or make a life-connection and think about when you have heard about them on the news!) • The Atlantic Ocean, Caribbean Sea and Gulf of Mexico hurricane season runs from June 1 through Nov. 30. • Most hurricanes occur from around the middle of August through the middle of October
Can anything stop these powerful storms? • Critical Thinking: Hurricanes depend on the tropical warm water and the evaporation in order to keep shape… so what do you think could stop them? As hurricanes travel over colder water or over land they lose their evaporation which causes them to weaken.
Check for understanding: Summary Write (in complete sentences) a summary of how a hurricane forms and what is needed in order to form a hurricane.
Just shy of hurricane: • Tropical Depression An organized system of clouds and thunderstorms with a defined surface circulation and maximum sustained winds* of 38 mph (33 kt**) or less • Tropical Storm An organized system of strong thunderstorms with a defined surface circulation and maximum sustained winds of 39-73 mph (34-63 kt)
Hurricane Categories: • Category One Hurricane (Sustained winds 74-95 mph, 64-82 kt, or 119-153 km/hr)-- Very dangerous winds will produce some damage • Category Two Hurricane (Sustained winds 96-110 mph, 83-95 kt, or 154-177 km/hr)--Extremely dangerous winds will cause extensive damage • Category Three Hurricane (Sustained winds 111-130 mph, 96-113 kt, or 178-209 km/hr)-- Devastating damage will occur • Category Four Hurricane (Sustained winds 131-155 mph, 114-135 kt, or 210-249 km/hr)--Catastrophic damage will occur • Category Five Hurricane (Sustained winds greater than 155 mph, greater than 135 kt, or greater than 249 km/hr).-- Catastrophic damage will occur
Hurricane Ike Video • What category do you think Hurricane Ike was? What evidence do you have to support your claim?
Damage Caused by Hurricanes http://www.nhc.noaa.gov/prepare/ • Hurricane winds can knock down trees and telephone poles • However, the most damage during a hurricane comes from flooding due to heavy rain and storm surges • A storm surge is a wall of water that builds up over the ocean and can be up to 20 feet before it crashes onto the shore
Hurricane Katrina Storm Surge • Why was Hurricane Katrina so devastating compared to other hurricanes?
Thunderstorms • Thunderstorms are caused by the vertical movement of warm air • Thunderstorms develop in three stages:
CUMULUS STAGE • Cumulus stage- warm air moves upward which produces moist winds
MATURE STAGE 2. Mature stage- a cumulonimbus cloud releases heavy precipitation (rain, sleet, or snow) • Blustery winds, heavy rainfall, and hail are common
DISSIPATING STAGE • Dissipating stage- air begins to move downward which causes the thunderstorm to end
Thunderstorms In the United States the western half of the country has the least amount of thunderstorm activity because warm, moist tropical air is not common in this area.
THUNDER and LIGHTENING Air builds up + and – electrical charges; current flows between opposite charges and lightening is produced. Rapid heating of air around a lightning bolt creates Thunder
Tornadoes • Violent whirling wind that moves in a narrow path over land usually SW to NE. • Tornados are more likely to occur when air is warmer (typically between April and June) • Tornados normally form with harsh thunderstorms. • Strong upward movement of air cause a vertical cylinder of rotating air, also called a mesocyclone to form.
What do you know about… • Precipitation? • How does it form? • What types are there? • Things other than water falling from the sky? • Evaporation- can anything other than water evaporate? • Jot down your current ideas
Fish Are Falling On My Head! • Have you ever heard of fish falling from the sky? Well, check this out!
It’s raining fish…. • Residents of a small outback Australian town have been left speechless after fish began falling from the sky. Hundreds of spangled perch bombarded the 650 residents of Lajamanu, shocking local Christine Balmer, who was walking home when the strange 'weather' started. She said: 'These fish fell in their hundreds and hundreds all over the place. The locals were running around everywhere picking them up.
‘The fish were all alive when they hit the ground so they would have been alive when they were up there flying around the sky.' When I told my family, who live in another part of Australia, about the fish falling from the sky, they thought I'd lost the plot.' But no, I haven't lost my marbles. All I can say is that I'm thankful that it didn't rain crocodiles!
Each group will read a different article about a similar case and write some notes about what happened, similarities to the other case, and probability that the cases are related. Other Cases 1) Fish Jumps Out of Water and Flies (Japan) http://news.bbc.co.uk/2/hi/science/nature/7410421.stm 2) Fish Falling from Sky (California and India) http://scienceline.org/2006/09/physics-cosier-rainingfish/ 3) Fish Falls from Sky (Shropshire, UK) http://www.bbc.co.uk/shropshire/content/articles/2005/03/22/raining_fish_knighton_feature.shtml 4) Everyday Mysteries: Can it rain frogs, fish and other objects? http://www.loc.gov/rr/scitech/mysteries/rainingfrogs.html
What did you find out? • After your groups has investigated your case, create a report poster to share your findings with the rest of the class.
Friday BELL RINGER • The boundary between two air masses is called a ________. • front • Stormy weather is often associated with ___________ pressure systems. • low • Calm, clear, weather is usually associated with ___________ pressure systems • high