Download presentation
Presentation is loading. Please wait.
1
Severe Weather Thunderstorms, Tornadoes, Hurricanes, etc…
2
Thunderstorms Thunderstorms are most often associated with a Cumulonimbus Cloud This is a cloud that forms when air is forced high into the atmosphere (against its will) Cold fronts often create this condition The process that forms a thunderstorm is very fast
3
Lightning Lightning is believed to be created by friction between the rising and falling air in a cumulonimbus cloud This friction creates a static charge Eventually there is a discharge between positive and negative charges, creating a “spark” a.k.a a lightning bolt
5
What is a blizzard? Blizzards are intense winter storms with winds of 35 m.p.h. or higher with falling and/or blowing snow to reduce visibility below ¼ mile for at least three hours.
6
How does it form? Just like a thunderstorm, a lot of warm moist air rises creating clouds and precipitation. The cold weather causes the precipitation to form as snow instead of rain.
7
Thought to be the 1st photograph of a tornado (1884)
Tornadoes Thought to be the 1st photograph of a tornado (1884)
8
Tornadoes Tornadoes are violent windstorms that form under cumulonimbus clouds Tornadoes form when a storm cloud begins spinning and the air pressure drops dramatically. Tornadoes are similar to vacuum cleaners. They suck up anything in their path
9
Tornado Development Most intense tornadoes are associated with supercells Supercells form when hot air and cold air mix. Hot air quickly rises and causes the cloud to begin spinning
10
Tornado Classification
Fujita Intensity Scale- Wind speed. F0- Moderate; mph F5- Severe; mph Path of Destruction Duration
11
Watches & Warnings Tornado Watch Tornado Warning
Conditions are ideal for a tornado to be created. Tornado Warning An actual tornado has been sighted in the area or is indicated by weather radar.
12
Tornado Frequency in the US
13
Cool Tornado Pictures
21
Hurricanes
22
Hurricane Formation Most hurricanes begin as a storm either above South America or to the West of Africa (Most Common)
23
Continued Growth Hurricanes begin as a storm
The ocean during this time has risen in temperature. This creates more water vapor and more energy As the storm enters the ocean it gains more energy and grows larger and larger
24
Hurricane Growth The storm sucks up water vapor like a vacuum.
As the water condenses it releases more and more energy. The hurricane will eventually get so large that the spin of the earth will cause it to spin.
25
Tropical Depressions, Tropical Storms and Huricanes
Hurricanes start as “Disturbances“ Once they move out into the ocean they become “Tropical Depressions” When they reach a wind speed of 39 mph they become “Tropical Storms” and are given a name When they reach a wind speed of 74 mph it becomes a Hurricane. The hurricane will develop an eye at this time.
26
Hurricane Names Hurricanes are named based on a list created by the national hurricane center. There are a total of 6 lists of names that are used every six years (the 2014 names will be used again in 2020) If a Hurricane creates enough devastation to be remembered it’s name is retired.
27
Hurricane names Answer to a previous question:
There once was a Hurricane Bob. The name was retired.
28
List of names 2016 2017 2018 2019 2020 2021 Alex Bonnie Colin Danielle Earl Fiona Gaston Hermine Ian Julia Karl Lisa Matthew Nicole Otto Paula Richard Shary Tobias Virginie Walter Arlene Bret Cindy Don Emily Franklin Gert Harvey Irma Jose Katia Lee Maria Nate Ophelia Philippe Rina Sean Tammy Vince Whitney Alberto Beryl Chris Debby Ernesto Florence Gordon Helene Isaac Joyce Kirk Leslie Michael Nadine Oscar Patty Rafael Sara Tony Valerie William Andrea Barry Chantal Dorian Erin Fernand Gabrielle Humberto Imelda Jerry Karen Lorenzo Melissa Nestor Olga Pablo Rebekah Sebastien Tanya Van Wendy Arthur Bertha Cristobal Dolly Edouard Fay Gonzalo Hanna Isaias Josephine Kyle Laura Marco Nana Omar Paulette Rene Sally Teddy Vicky Wilfred Ana Bill Claudette Danny Elsa Fred Grace Henri Ida Julian Kate Larry Mindy Nicholas Odette Peter Rose Sam Teresa Victor Wanda
29
Hurricanes, Typhoons and Cyclones
We give different names to Tropical Storms that develop, depending on their location Atlantic: Hurricane Pacific: Typhoon Indian: Cyclone They are all the same exact type of storm.
30
Hurricane Classification The Safir-Simpson Scale
Type KNOTS MPH millibars inches of mercury Feet Meters Damage Depression less than 34 less than 39 ------ Tropical Storm Category 1 greater than 980 greater than 28.94 3 - 5 minimal Category 2 6 - 8 moderate Category 3 9 - 12 extensive Category 4 extreme Category 5 136+ 156+ less than 920 less than 27.17 19+ 5.7+ catastrophic
31
Hurricane Dangers The biggest danger of a hurricane is the Storm Surge and the Eye. The storm pulls on the ocean raising the water level. When the storm hits land the water rushes up and causes flooding. The eye is a peaceful area with little wind and rain. It is dangerous though because if your are is hit by the eye you will be hit twice by the front and back of the storm.
32
A Hurricane’s “Death” As a hurricane makes landfall, the supply of warm, moist air that was fueling it is cut off This may take days and 100’s of miles
Similar presentations
![Tropical Storms[Date] Today I will: - Know the location and features of tropical storms Geography Environmental Hazards.](/33/8187800/big_thumb.jpg "Tropical Storms[Date] Today I will: - Know the location and features of tropical storms Geography Environmental Hazards.>")
