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ATM OCN 100 - Summer 2001 LECTURE 1B. OBSERVATIONS of EARTH'S ATMOSPHERE (con’t.) A. Introduction Practical Questions B. The Planet Earth & Earth Systems C. Survey of Planet Earth’s Atmosphere D. Weather & Climate Elements E. Probing the Atmosphere. MADISON’S CURRENT WEATHER.
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ATM OCN 100 - Summer 2001LECTURE 1B OBSERVATIONS of EARTH'S ATMOSPHERE (con’t.) • A. IntroductionPractical Questions • B. The Planet Earth & Earth Systems • C. Survey of Planet Earth’s Atmosphere • D. Weather & Climate Elements • E. Probing the Atmosphere
MADISON’S CURRENT WEATHER Madison Weather at 1000 AM CDT WED JUN 19 2002 Updated twice an hour at :05 and :25 Sky/Weather: LGT RAIN Temperature: 67 F (19 C) Dew Point: 60 F (15 C) Relative Humidity: 78% Wind: S10 MPH Barometer: 30.14R (1020.6 mb)
F. THE SURFACE WEATHER MAP (con’t.) • Interpretation of modern surface weather mapswhere...
ON THE SURFACE WEATHER MAP • Pressure systems • Isobars (“iso” + “bar”) • Highs & Lows • Winds • Circulation around Highs & Lows • The “Hand-twist Model”
Flow around Low Pressure Fig. 9.18 Moran & Morgan (1997)
ON THE SURFACE WEATHER MAP • Pressure systems • Winds • Clouds • Mainly around lows • Temperature Patterns • Isotherms (“iso” + “therms”) • Fronts • Cold fronts, warm fronts & stationary fronts
Current Surface Weather Map with Isobars (“iso” = equal & “bar” = weight), Fronts and Radar Isobars
Current Temperatures (°F) & Isotherms(“iso” = equal +”therm” = temperature)
Rule of Thumb!Weather Systems move: • From West to East in midlatitudes • From East to West in tropics