Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.
-
Upload
lionel-skinner -
Category
Documents
-
view
233 -
download
0
Transcript of Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.
![Page 1: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/1.jpg)
Weather Patterns & Severe StormsCh. 20 sec. 3 only
200
![Page 2: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/2.jpg)
• What is a tornado?– violently rotating column of air• usually touches the ground
• What do tornadoes look like?–often vortex or funnel-shaped
cloud (w/ flying debris)– can also be:• rope shaped• wedge shaped–w/ more than one vortex
Tornadoes
![Page 3: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/3.jpg)
• How do tornadoes form?– rotating updraft forms
(mesocyclone)– air pressure at center = very low• air sucked in expands & cools–water vapor condenses & wall cloud
may become visible @ base of storm
• If air is drier or pressure is higher, cloud may contain dust & debris– creates loud roaring sound
TornadoesBrain Pop: Tornadoes
![Page 4: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/4.jpg)
• When & where do tornadoes form?–anywhere & at any time of year•MOSTLY in “Tornado Alley” (Texas northward
to South Dakota) in spring & early summer
Tornadoes
![Page 5: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/5.jpg)
• How is the intensity of a tornado measured?– Fujita scale• F0 (weakest) to F5 (most violent)
• What are the effects of tornadoes?
Tornadoes
![Page 6: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/6.jpg)
Tornadoes• Predicting formation & path is difficult.–Why?• b/c destructive & often unpredictable–can damage instruments–can put people in danger
–Improvements have been made.• conventional radar map precipitation• Doppler radar identify which way winds are
moving within storm–can identify a rotating mesocyclone & give people
~20 min advance warning
![Page 7: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/7.jpg)
Tornadoes• What is the difference between a tornado
watch & warning?–watch tornado MAY form–warning tornado spotted
![Page 8: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/8.jpg)
• What is the difference between a hurricane, typhoon, & cyclone?–location•Atlantic–hurricane
•Pacific–typhoon
• Indian–cyclone
Hurricanes
![Page 9: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/9.jpg)
Hurricanes• What is a hurricane?– a large rotating storm of tropical origin that has
sustained winds of at least 119 km/hr (74 mph)
![Page 10: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/10.jpg)
Hurricanes• How do hurricanes form?– in tropics a mild atmospheric disturbance causes
humid air to rise• more water condenses & releases heat– continues as long as humid air is available & rising
» to become a hurricane, it must begin to rotate (counterclockwise in the N. Hemi. due to Coriolis Effect)
Animated Guide: HurricaneBrain Pop: Hurricanes
![Page 11: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/11.jpg)
Hurricanes• What are the 3 main parts of a hurricane?–eye• lowest pressure– calm
–eye wall• outer edge of eye• strongest wind• strongest rain
– rain bands• clouds that spin out• make storm bigger
![Page 12: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/12.jpg)
Hurricanes• What is the
pressure like at the center of a hurricane?– very low
• Hurricane Sandy– lowest pressure
for any storm to hit north of North Carolina• 940 millibars or
27.76 inches
![Page 13: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/13.jpg)
• What determines the path of a hurricane?– global wind patterns• In Atlantic (N. Hemi.) generally move west or northwest.
– Then, often curve north (and may eventually head east).
– actual paths can vary considerably… • shown by “cone of uncertainty”
Hurricanes
![Page 14: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/14.jpg)
• What are some of the effects of hurricanes?–wind damage– inland flooding– storm surge• large wave of
water from strong winds of eye wall– blow water
into a dome
–waves• coastal erosion
Hurricanes
![Page 15: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/15.jpg)
• When is hurricane season in the U. S.?– June 1 – November 30
• Difference between hurricane watch & warning?–watch expected to arrive w/in 24-36 hours–warning expected to w/in 24 hours or less
Hurricanes
![Page 16: Weather Patterns & Severe Storms Ch. 20 sec. 3 only 200.](https://reader036.fdocuments.us/reader036/viewer/2022081419/56649f265503460f94c3d6f0/html5/thumbnails/16.jpg)
• How do scientists classify tropical storms/hurricanes?–by wind speed• tropical depression up to 61 km/hr• tropical storm 61
– 119 km/hr• hurricane 119+
km/hr– Saffir-Simpson scale
to rate strength
Hurricanes