ATM 10 Lecture Notes - Lecture 16: Vapor Pressure, Lightning, Sahara
Document Summary
Lecture 16: december 1, 2014: weather at fronts, blizzards: weather at fronts. Fronts are drawn on a surface weather map that is where the front intersects the ground. Steep front slope; advancing cold air forcing warm, moist air upwards. Thunderstorm are likely if warm air conditionally unstable: weather near warm fronts. Slope of warm front is much less vertical than cold front: gentle slope; advancing warm air riding up and over cold air. If warm air conditionally unstable, convection may be embedded in broad cloud band (heavier showers) Temperature profile shown as inversion at front: weather near occluded fronts, mix of cold and warm front weather. Neither an object nor the air has temperature twc. Blizzards: meteorological conditions, criteria for a blizzard warning, wind has to be greater than 30 kts, visibility less than mile, duration at least 3 hours, need an intense frontal cyclone, need high surface winds.