1 Do not apply the ice directly to the knee; instead, cover your knee with a cotton towel. 2  Place ice in a plastic zip-close bag, and then place the bag on the towel. 3  Wear cushioned, flat shoes that support your feet and donât exacerbate your pain. 4  Avoid sleeping on your side.
A simple and general rule-of-thumb for estimating a storm's low pressure contribution to the surge is as follows: 1 cm of rise above predicted tidal values for each 1 hPa below the standard atmospheric pressure of 1013 hPa. For example, Hurricane Juan had a central pressure of 974 hPa when it made landfall just west of Halifax Harbour. The pressure effect alone would result in a surge of approximately 39 cm, however, the surge measured in Halifax Harbour was about 150 cm. Clearly, a more important mechanism was at work. The wind is the key.
pressure at any given height is called an air mass. A single air mass may spread over millions of square kilometers and be up to 10 kilometers deep. Types of Air Masses Scientists classify air masses according to two characteristics: temperature and humidity. Four major types of air masses influence the weather in North America: maritime tropical, continental tropical, maritime polar, and continental polar. The characteristics of an air mass depend on the temperatures and moisture content of the region over which the air mass forms. Remember that temperature affects air pressure. Cold, dense air has