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MADISON’S CURRENT WEATHER

Get the latest weather update for Madison, Wisconsin at 10:00 AM CDT on 6 Aug 2002. Temperature: 67°F (19°C), Dew Point: 53°F (11°C), Relative Humidity: 61%, Wind: E16 MPH.

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MADISON’S CURRENT WEATHER

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  1. MADISON’S CURRENT WEATHER Madison Weather at 1000 AM CDT 6 AUG 2002 Updated twice an hour at :05 and :25 Sky/Weather: MOSUNNY Temperature: 67 F (19 C) Dew Point: 53 F (11 C) Relative Humidity: 61% Wind: E16 MPH Barometer: 30.34R (1027.4 mb)

  2. Last 24 hrs in Madison FOG

  3. TD BERTHA CURRENT VISIBLE

  4. TD BERTHA CURRENT IR

  5. Current Surface Weather Map with Isobars (“iso” = equal & “bar” = weight), Fronts and Radar

  6. Current Surface Winds with Streamlines & Isotachs (“iso” = equal & “tach” = speed) H L L L L H L H L L H H L H L L L L H H H H

  7. Current Temperatures (°F) & Isotherms(“iso” = equal +”therm” = temperature)

  8. Current Dewpoints (oF)

  9. Current 34,000 ft. Winds & Jet Streamwith Streamlines & Isotachs (“iso” = equal & “tach” = speed) Trough Trough Ridge

  10. Tomorrow AM Forecast Map

  11. Announcements • Homework #5 is Wednesdayhttp://www.aos.wisc.edu/~hopkins/aos100/homework • 3rd Hour Exam is scheduled for Thurs. See Review Sheet that has been posted at: http://www.aos.wisc.edu/~hopkins/aos100/exams • If you have ??, please see me.

  12. Weather along Storm Tracks(A) Warm Side vs. (B) Cold sidesee Fig. 11.15 of Moran & Morgan (1997)

  13. ATM OCN 100 – Summer 2002LECTURE 24 (con’t.) PLANETARY-SCALE CIRCULATION of EARTH'S ATMOSPHERE • Introduction • Global Scale Prevailing Surface Winds • Average Sea-Level Pressure Patterns • Theoretical Aspects • Variations in Planetary-Scale Circulation

  14. E. VARIATIONS IN PLANETARY-SCALE CIRCULATION(con’t.) • El Niño - Southern Oscillation [ENSO Events] • La Niña

  15. Onset of Last Major El Niño

  16. WHAT’S INVOLVED • Long-term “Normal” Conditions • Atmospheric Component: • Semi-permanent Pressure Patterns; • Wind Circulation Regime; • Precipitation Patterns. • Oceanic Component: • Large-Scale Ocean Circulation; • Upwelling; • Sea-surface temperature patterns; • Thermocline.

  17. Average Air Pressure & Atmospheric Circulation

  18. OCEAN CURRENTS

  19. UPWELLINGSee Figure 10.23 Moran & Morgan (1997)

  20. El Niño Teleconnections See Fig. 10.24 Moran & Morgan (1997)

  21. OTHER TERMS • Southern Oscillation [SO] • Variations in sea-level pressure over Pacific basin. • El Niño - Southern Oscillation [ENSO Events] • La Niña • Anomalous cooling of SST inEastern Pacific Ocean every few years.

  22. A Recent La Niña From NOAA

  23. La Niña Teleconnections

  24. Recent Sea Surface Temperature (SST) Anomaliesin Celsius degrees[=Current - Average SST values]NOAA-NESDIS

  25. ATM OCN 100 - Summer 2002 LECTURE 26MID-LATITUDE WEATHER SYSTEMS:PART I: SETTING, AIR MASSES & FRONTS A. INTRODUCTION -- SCOPE of MIDLATITUDES • Geographic Extent • Human Aspect • Meteorological Significance of Midlatitudes

  26. B. AIR MASSES • Definition • Body of air with uniform horizontal temperature & moisture characteristics: • at any level; • over large area. • Historical Perspective • Present use from 1920’s

  27. B. AIR MASSES (con’t.) • Air Mass Considerations • Used to describe weather regimes • Air Mass Characteristics • Dimensions – 1000’s of kilometers. • Life History – days to a week. • Requirements For Air Mass Generation • Large, uniform source region • Relative long residence time

  28. B. AIR MASSES (con’t.) • Traditional Air Mass Classification Scheme & Analysis • Temperature • Humidity • Primary Air Mass Types

  29. PRIMARY AIR MASS TYPES

  30. Principal North American Air Masses & Source RegionsSee Figure11.1, Moran & Morgan (1997)

  31. B. AIR MASSES (con’t.) • Air Mass Modification • Lake Effect Snow -- An Example

  32. Lake Effect Snow

  33. “Lake-Effect” Snow

  34. C. FRONTSorFRONTAL ZONES • Introduction • Historical concept from Norwegian School • Principal Global Frontal Zones

  35. Air Masses, Fronts & the Planetary Scale Circulation RegimeSee Figure 10.4, Moran & Morgan (1997) Polar Air Polar Front Equatorial Front Tropical Air Polar Front

  36. C. FRONTSorFRONTAL ZONES (con’t.) • Introduction • Historical concept from Norwegian School • Principal Global Frontal Zones • The polar front • Equatorial front (or ITCZ) • Types of Synoptic Scale Fronts • Cold Fronts • Warm Fronts • Stationary Fronts • Occluded Fronts

  37. Frontal Symbols: Warm Front

  38. Frontal Symbols: Cold Front

  39. Frontal Symbols: Stationary Front

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