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DO NOW

DO NOW. Turn in GHG lab Get out weather intro – don’t turn it in yet Complete the table for the two weather station symbols below. . 22. 085. 90. 632. 8 5. Weather Station Symbols. Define: Temperature – Weather Symbol – Dew Point Temperature – Cloud Cover –

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DO NOW

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  1. DO NOW Turn in GHG lab Get out weather intro – don’t turn it in yet Complete the table for the two weather station symbols below. 22 085 90 632 85

  2. Weather Station Symbols Define: Temperature – Weather Symbol – Dew Point Temperature – Cloud Cover – Sea Level Pressure – Wind Barb –

  3. Weather Stations Symbols

  4. Weather Station Symbols

  5. Sea Level Pressure < 500 Initial 10 is missing. Place it on left, then divide by 10. 027 becomes 1002.7 mb. PRACTICE! 335 763 445 987 > 500 Initial 9 is missing. Place it on left, then divide by 10. 827 becomes 982.7 mb.

  6. Wind Barbs Wind barbs point in the direction ________which the wind is blowing. In the case of the diagram to the right, winds are from which direction? FROM

  7. Wind Barbs

  8. PRACTICE!

  9. Create a Station Symbol Practice Temperature 15 °F Condition: Heavy Snow Dew Point Temperature 15 °F Wind Speed: 35 mph Wind Direction: NE Pressure: 1006.5 Cloud Cover % 75

  10. Pressure Systems Anticyclones Cyclones Low Pressure Systems Caused by rising air Air moves toward the center LOW PRESSURE SUCKS! Characteristic Air Flow INWARD COUNTERCLOCKWISE • High Pressure System • Caused by sinking air • Air spreads out Characteristic Air Flow • OUTWARD • COUNTERCLOCKWISE

  11. Pressure Systems Anticyclones Cyclones

  12. Isobars • A line connecting areas of equal pressure • Show areas of high or low pressure EXAMPLE

  13. Isobars

  14. Isotherms • A line connecting areas of equal temperature EXAMPLE

  15. Isotherms

  16. Fronts • Transition zone between air masses of different densities • Warm air is lighter than cool • Moist is lighter than dry • Creates clouds and rain

  17. Fronts • Passage of 1 air mass & entrance of the next usually results in rain (or at least clouds) • Followed by a change in temperature. Get their name by type of air coming in. For Example: In warm air, rains, gets colder = cold front

  18. Stationary Front • Two air masses meet – neither one advances • Hard to predict • Unstable

  19. Cold Front • Leading edge of cold air mass • Denser than warm air • Sudden short period of heavy rain • Sometimes thunderstorms

  20. Cold Front

  21. Warm Front • Leading edge of warm air mass • Move slower than cold fronts • Warm air deflected upward • Hot air raises then falls, causing gentle rain

  22. Warm Front

  23. Animations*

  24. Occluded Front • Combo! (warm and cold fronts combined) • Cold front catches warm front • Often near center of low pressure system

  25. Air Masses

  26. Regional Air Masses

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