learning to observe & read the sky
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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. - PowerPoint PPT PresentationTRANSCRIPT
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Learning to observe & read the sky
10/9
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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.
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OBSERVE THE CLOUDS
1. Type and direction tell a lot about the upcoming weather.
2. Clouds that are white and high generally indicate good weather.
3. Clouds that are dark and low indicate storms.4. Mammatus clouds
1. Foretell thunderstorms (severe and non severe)
5. Cirrus clouds or “mare’s tails high in the sky – long tails indicate bad weather coming within 36 hours.
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Mare’s tales
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Altocumulus – Mackerel scales
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Cumulus towers
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Red Sky at night
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Red sky in the morning,
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Norwood, this a.m.
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Gaze at the moon
Ring around the moon Meaning:• Caused by light shining
through cirrostratus clouds• Associated with warm
fronts and moisture: impending rain
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Detect wind direction
Toss grass to determine wind direction
• 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
This is a photo of a strong wind!
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Observe the grass and leaves
Dew or no dew• If there is no dew, it is dry….• If there is dew on the grass
…
leaves• Look at the leaves of
deciduous trees before a storm.
• What do they do?
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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??
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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!!