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Sept 17 PowerPoint Presentation

Sept 17

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Sept 17

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  1. Sept 17 • Today • Date of Midterm #1: Wed. Oct 1st • also Term Paper Topics due • Weather Review – • Weather Maps and Isopleths • Next Week – Sept 22 & 24 • Humidity, Condensation, Fog, Clouds, Precip (Chp 4 & 5)

  2. Weather Review

  3. Weather Review

  4. Weather Review

  5. Weather Review

  6. Weather Review • Computer Models (aka “progs”) • Simulation of the atmosphere • Begin with initial conditions • Temperature • Moisture • Pressure • Wind • Apply atmospheric physics, thermodynamics, chemistry • Press “PLAY” • Simulates conditions into the future

  7. Weather Review

  8. Weather Symbols and Maps

  9. Station model 021 80 -23 63

  10. Weather Symbols

  11. Sky Symbols

  12. Wind Symbols

  13. Pressure Tendency

  14. Station model 80 021 -23 63

  15. Station model 80 021 -23 63 Temperature Surface: ºF Upper air: ºC

  16. Station model 021 80 -23 63 Dew point temperature Surface: ºF Upper air: ºC

  17. Station model 021 80 -23 63 Totalsky cover ** Depicted by shading in circle

  18. Station model 021 80 -23 63 Current weather conditions ** If blank, “no weather”

  19. Station model 80 021 -23 63 Wind direction – of wind toward center

  20. Station model 80 021 -23 63 Wind speed Long barb = 10 knots Short barb = 5 knots Flag = 50 knots ** Notice range of wind speeds (i.e., 28-32 knots)

  21. Station model 021 80 -23 63 Sea level pressure **If first number is 5 or greater, then place 9 in front --Otherwise, place 10 in front **Place decimal point between last two numbers

  22. Station model 021 80 -23 63 Change in surface pressure during last 3 hours ** In tenths of mb ** Line describes how pressure changes over time from left to right

  23. Example 1 • Temperature: 76 ºF • Dew point: 65 ºF • Sky cover: Completely overcast • Current weather: Light rain • Wind direction and speed: Southwest at 15 knots • Sea level pressure: 995.3 mb • Pressure tendency: Increase of 1.6 mb; rising steadily 76 953 +16 65

  24. Example 2 • Temperature: 10ºF • Dew point: 8ºF • Sky cover: 7/10 or 8/10 • Current weather: Snow shower • Wind direction and speed: North at 3-7 knots • Sea level pressure: 1010.5 mb • Pressure tendency: Decrease of 0.4 mb; falling, then steady

  25. High & Low Pressure Systems • Air pressure Patterns are main organizing feature • Circulation in Northern Hemisphere • Clockwise around Highs (H) • CCW around Lows (L) • Clouds & Precip around Lows • Temperature patterns result from latitude, wind flow and cloud cover

  26. Plotting Fronts • Boundary between Different Air Masses • Types of Fronts

  27. Weather Maps

  28. ISOPLETHS

  29. Contour Maps

  30. Contour Maps

  31. Contour Maps

  32. Weather Maps

  33. Weather Maps

  34. Weather Maps

  35. Weather Maps

  36. ISOTACHS

  37. ISOHYET

  38. ISOPLETHS • Connects all points that have the same value • Iso = equal (Greek) • Also called “Isolines” • Types • Isobar = pressure • Isallobar = pressure change per time • Isotherm = temperature • Isohyet = rainfall • Isonif = snowfall • isotach = wind speed