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Learning to observe & read the sky

Learning to observe & read the sky. 10/9. Wind – review from 10/8. Wind is produced as a result of an imbalance in air pressure. (Usually in horizontal directions.) The imbalance itself is caused by a temperature difference in adjacent areas.

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Learning to observe & read the sky

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  1. Learning to observe & read the sky 10/9

  2. Wind – review from 10/8 • Wind is produced as a result of an imbalance in air pressure. • (Usually in horizontal directions.) • The imbalance itself is caused by a temperature difference in adjacent areas. • Ultimately, it is thee uneven heating of the Sun that causes temperature differences and the circulation that causes pressure differences.

  3. OBSERVE THE CLOUDS • Type and direction tell a lot about the upcoming weather. • Clouds that are white and high generally indicate good weather. • Clouds that are dark and low indicate storms. • Mammatus clouds • Foretell thunderstorms (severe and non severe) • Cirrus clouds or “mare’s tails high in the sky – long tails indicate bad weather coming within 36 hours.

  4. Mare’s tales

  5. Altocumulus – Mackerel scales

  6. Cumulus towers

  7. Red Sky at night

  8. Red sky in the morning,

  9. Norwood, this a.m.

  10. Gaze at the moon Ring around the moon Meaning: Caused by light shining through cirrostratus clouds Associated with warm fronts and moisture: impending rain

  11. Detect wind direction Toss grass to determine wind direction This is a photo of a strong wind! • Easterly winds can indicate an approaching storm front. • Westerly winds mean good weather • Strong winds indicate high pressure differences which can be a sign of approaching storms

  12. Observe the grass and leaves Dew or no dew leaves Look at the leaves of deciduous trees before a storm. What do they do? • If there is no dew, it is dry…. • If there is dew on the grass …

  13. Make your hypothesis • Summarize your observations, and those of the first period class. • Clouds (a.m.): mare’s tales, cirrus, altostratus • Clouds (noon): • Wind (a.m.): gusty • Wind (noon) • Sky (a.m.) • Barometric pressure (see and copy the table) • Grass, and leaves: a.m. (dew was present), leaves of deciduous trees were “normal.” • Noon: • WHAT IS YOUR FORECAST FOR THE NEXT 24 HOURS??

  14. UPCOMING ASSESSMENT • Quiz/quest next week (clouds, air pressure, convection, conduction, radiation, weather instruments, winds, Coriolis effect.) • Weather forecast (with a partner) to lower grade • Content of forecast: • Weather maps (local and national) • Temperature (daily high and low) • Fronts and air masses • Precipitation • Cloud cover • Wind speed and direction • More to come!!

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