meteorology 2

how is the data measured

how often do they gather weather data

taken in degrees and dew point taken in the shade no wind 6feet above grass

usually in millibars pressure is abbreviated 1013.2 on the model becomes 132 998.2 on the model becomes 982can also be in inches of mercury 29.92 is sea level

large chunk of air that acquires characteristics of location temp moisture

warm

cold

dry

moist

boundary between 2 different air masses air masses collide and the weather can change dramatically fronts are always attached to low pressure, never high pressure

types of fronts

pressure rises temp drops winds shift to the north rain cumulonimbus clouds

pressure drops temp increases winds shift to the south rain is produced Stratiform clouds cirrus, altostratus, stratus and nimbostratus

neither cold nor warm air is advancing soaking rains produced nimbostratus clouds

show the pressures across the country by using isobars show the pressure usually in inches or millibars every point along isobars the exact same pressure

the change in pressure between isobar lines common interval is 4 or 5 millibars or .10 inches isobars never cross or touch

clear skies above the high pressure winds move in a clockwise direction cool air is sinking from upper atmosphere pressure values decrease away from pressure center no fronts

an educated prediction of the future weather based on observation climate General trends our weather systems move from west to east move about 1/3 of US in 24 hours

cloudy skies warmer temps lower pressures winds rotate counter-clockwise

clear skies lower temps higher pressure winds rotate clockwise

rain cloudy skies warmer temps lower pressure higher dew points south winds

typical cyclone area of very Low pressure winds rotate in a counter clockwise direction originate off the west coast of Africa as thunderstorms

over warm water - typical 80° high humidity low wind shear rain bands eye wall eye

wind moving in different directions