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Microbursts, Chinook Winds, Cloud Formation. Vapor and Energy in the Atmosphere. Context. Structure of the atmosphere Issues: ozone, global warming, acid rain Basic weather concepts Temperature, humidity, dew point, cloud formation, fronts, pressure, highs and lows Storms

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microbursts chinook winds cloud formation

Microbursts, Chinook Winds, Cloud Formation

Vapor and Energy

in the Atmosphere

context
Context
  • Structure of the atmosphere
  • Issues: ozone, global warming, acid rain
  • Basic weather concepts
    • Temperature, humidity, dew point, cloud formation, fronts, pressure, highs and lows
  • Storms
    • Thunderstorms, mid-latitude cyclones, hurricanes
  • climate

About 10 weeks

purpose
Purpose
  • Cloud formation demos
  • Cloud formation activity
  • Energy demo
  • Lab activity that will help your students better understand . . .
    • Microbursts
    • Chinook Winds
    • Hurricanes
cloud demos 3
Cloud Demos (3)
  • Watch a video of the “ultimate” cloud demo
  • Click here

NEXT: The student activity

do not try this at home
Do NOT try this at home

DEMO how alcohol vapors burn.

student activity what s the recipe for a cloud
Student ActivityWhat’s the recipe for a cloud?
  • Click here to watch a video of the student activity.

NEXT: Energy Demo

slide8

Take a look at the handout.

Water Vapor

Water molecules

releaseheat.

Water molecules

absorbheat.

B

D

A

Liquid Water

F

Surrounding air

gets warmer.

Surrounding air

gets colder.

C

E

Frozen Water

(Ice)

slide11

0 C

*

- 4 C

ICE

SLUSH

slide12
Chinooks are common in rain shadows

There’s more to it

than just compression.

examples of the chinook effect
Examples of The Chinook Effect
  • In January of 1916, Browning had a temperature swing of 100 F
  • At Havre a temperature increase of 43 F in 15 minutes has been recorded.
  • At Loma on January 15, 1972 temp. increased from -56 F to 49 F
not just a montana phenomenon
Not just a Montanaphenomenon
  • Rapid City 1943
  • 7:30 am temp was -4 F
  • In 2 minutes it rose 49 degrees
  • 9:00 am temp was 54 F
  • By 9:30 am temp was -4 F again
slide21

Chinook does not mean “Snow Eater”

. . . But they do “eat” snow

next microbursts question 6
Next: MicroburstsQuestion #6

Small intense downburst

downbursts discovered by ted fujita
1920-1998

Saw destruction at Hiroshima and Nagasaki

Moved to USA in 1953

Tornado outbreak of April 1974

Eastern Airlines flight #66 in 1975

Downbursts: Discovered by Ted Fujita
slide24
Dr. Greg Forbes

Fujita’s most famous student

slide25

“Tornado Outbreak”

April 3-4, 1974

  • 148 twisters
  • 16 hours
  • 330 deaths
  • Six F-5s
  • Several ???
downed trees provide evidence
Downed trees provide evidence.

Photo courtesy of T. Fujita

Shows damage from 1977 downburst in

Northern Wisconsin

slide27

Photo courtesy of T. Fujita

Swath was 166 miles long, 17 miles wide

9 warm water is the fuel
#9. Warm Water is the “fuel”
  • Vapor from warm water enters storm
  • Humid air rises -> cools by expansion
  • Vapor changes to liquid cloud droplet
  • Heat energy released
  • Makes air lighter -> helps it rise
  • Pressure becomes lower
  • Wind speed toward storm center increases
slide38

Questions 10-15

Water Vapor

Water molecules

releaseheat.

Water molecules

absorbheat.

B

D

A

Liquid Water

F

Surrounding air

gets warmer.

Surrounding air

gets colder.

C

E

Frozen Water

(Ice)

resources
Resources
  • This presentation is available on www.TeacherTube.com
  • rbenson@helena.k12.mt.us
  • Rodney’s Homepage for Earth Science Teachers
    • www.formontana.net/home.html

If time allows . . . Chinook Arch