ch_10_11_13

ch_10_11_13 - CHAPTER 10 SEVERE WEATHER Weather Principles...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CHAPTER 10- SEVERE WEATHER Weather Principles Heat capacity- the ability to absorb heats. Sand and rock have small specific heats. Convection- transmission of heat in flowing water (or air). Conduction is the transfer of heat through a mass. Adiabatic process- Temperature changes without loss of heat. E.g. expansion cooling or compressional warming. Earth rotates at 1,037 mph. Hadley cells- Equate\or and descending air around 30 degrees N and S latitudes create semicircular air circulation routes. Jet Streams Polar jet- between the polar air cell (Above the polar easterly winds) and the midlatitude air cell (above the westerly winds), elevated to about 10 to 14 km. During each hemisphere’s winter, the atmospheric temperature contrasts between pole and equator are greatest, and each polar jet races its fastest. Dominant direction of air-body movement is from west to east under the influence of the Earth’s rotation. Air masses that build over the northern Pacific affect the US. Fronts Advance of a cold front- lifts warm air up to higher altitudes forming tall clouds that may produce thunderstorms, bendint he rain falling from a warm air mass. Advance of a warm front- flatter wedge, broad and gentle front, commonly producing widespread clouds. Polar-front jet streams rotate bodies- Northern Hemisphere, bends in the W-to-E flow of the polar jet create areas of diverging air at southward-bending troughs of lower pressure and regions of converging air at northward-extending ridges of higher pressure. Cyclone- rotate horizontally about a vertical core. Anticyclone- clockwise, opposite the Earth’s direction of rotation in the Northern Hemisphere. March 1993, huge storm caused by large trough in the jet stream and three front migrating toward it. Microbursts- composed of a mass of cold air descending violently along with rain and maybe hail. August 1985, Dallas-Fort Worth- killing 133 of 163 passengers on a plane because of microbursts. Thunderstorms in the Conterminous US Florida, most thunderstorms meet because warm waters of the Atlantic Ocean and Gulf of Mexico. Central Texas- Eroded Balcones Escarpment still stands high enough to influence the weather, separating moist formations in the East from dry formations in the West.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 4

ch_10_11_13 - CHAPTER 10 SEVERE WEATHER Weather Principles...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online