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ATM OCN 100 - Summer 2002 LECTURE 30

ATM OCN 100 - Summer 2002 LECTURE 30. MID-LATITUDE WEATHER SYSTEMS: PART III: ANTICYCLONES A. INTRODUCTION Are high pressure systems important? How do they differ from low pressure systems?. So What About Highs? Anticyclone Weather Features From UIUC WW2010. ANTICYCLONE “HAZARDS”.

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ATM OCN 100 - Summer 2002 LECTURE 30

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  1. ATM OCN 100 - Summer 2002LECTURE 30 MID-LATITUDE WEATHER SYSTEMS:PART III: ANTICYCLONESA. INTRODUCTION • Are high pressure systems important? • How do they differ from low pressure systems?

  2. So What About Highs?Anticyclone Weather FeaturesFrom UIUC WW2010

  3. ANTICYCLONE “HAZARDS” • Heat Waves • Droughts • Air Pollution Episodes • Cold Waves

  4. COLD WAVES • Terminology • COLD WAVE • Rapid fall in temperatures over 24 hours • EXTREME COLD • Temperatures well below normal. • Situation • A cold-core Arctic high moves equatorward. • Consequences • Hypothermia to humans; • Leading edge maybe accompanied by blizzards; • Freeze damage to citrus crops.

  5. DROUGHTS • Terminology • An abnormally long interval with little precipitation causing a serious moisture deficit. • Situation • A warm-core high becomes stagnant over region. • Consequences • Crop and vegetation losses; • Water crises and water restrictions; • Often associated with heat waves.

  6. HEAT WAVES • Terminology • A multi-day interval with excessive heat and unusually high humidity. • Situation • A warm-core high becomes stagnant over region. • Consequences • Heat stress and hyperthermia to humans; • Crop and vegetation losses; • Often associated with droughts.

  7. AIR POLLUTION EPISODES • Terminology • An extended time interval where concentrations of atmospheric contaminants reach dangerous levels. • Situation • A high becomes stagnant over region. • Consequences • Increased smog; • An unhealthy environment for humans; • A reduction in visibility.

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