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.
The following graph (Figure 7u-3) shows the relationship between surface pressure and sustained wind speed for a number of tropical low pressure systems. Figure 7u-3: Relationship between surface pressure and wind speed for a number of tropical lowpressure systems. Tropical low pressure systems are classified as hurricanes when their pressure is 980 millibars or lower, and sustained wind speeds are greater than 118 kilometers per hour. Hurricanes have no fronts associated with them like the mid-latitude cyclones of the polar front.