| A | B |
|---|
| barometer | measures air pressure |
| psychrometer | measures relative humidity |
| thermometer | measures temperature |
| temperature scales | Celsius & Fahrenheit |
| absolute zero | where all kinetic motion ceases |
| low pressure | cloudy, miserable weather |
| high pressure | fair weather |
| cumulus clouds | puffy, piled up |
| cirrus clouds | high, feathery |
| nimbus clouds | dark, rainy |
| cirrostratus | rain w/in 12 - 48 hrs. |
| cumulonimbus | thunderstorms & possible tornadoes |
| stratus clouds | layers of clouds |
| warm front | gentle slope & slow, steady rain |
| cold front | severe slope & severe storms |
| F-0 tornado | winds up to 72 mph |
| hurricane | winds 74 mph or higher |
| storm surge | wall of water pushed by hurricane |
| hurricane watch | hurricane 24 - 36 hours away |
| hurricane warning | hurricane within 24 hours |
| warm air | not dense, holds lots of water vapor |
| cold air | dense, doesn't hold lots of water vapor |
| evaporation | liquid water turning to vapor |
| condensation | water vapor turning to liquid |
| precipitation | liquid or frozen water falling from sky |
| dust & smoke particles | what water condenses on in the sky |
| reflection of light | what causes clouds to be seen |
| ocean | heat up slowly; lose heat slowly |
| soil | heats up quickly; loses heat quickly |
| tropical oceans | what gives energy to hurricanes |
| Doppler radar | speed & direction of water droplets |
| sleet | caused by cold air at ground level |
| hail | caused by warm air at ground level |
| temperature | determines type of precipitation |
| counter-clockwise | direction of hurricanes in N. hemisphere |
| clockwise | direction of hurricanes (typhoons) in S. hemisphere |
| unequal heating of air masses | cause of differences in air pressure |
| rotation of the earth | cause of major wind patterns |
| front | boundary between 2 air masses |
| stationary front | air is not moving |
| occluded front | 2 cold air masses & 1 warm air mass |
| moist air mass | usually developes over water |
| spring | when tornadoes are most likely to occur |
| late summer, early fall | when hurricanes are most likely to occur |
| west to east | direction of weather movement in US |
| blue skies, cooler temperatures, dry air | high pressure systems |
| cloudy skies, warmer temperatures, moist air | low pressure systems |
| lightning | caused by unequal charges in the air & sky |
| blizzard | high winds, lots of snow, freezing remperatures |
| F-5 tornado | causes incredible damage |
