Fluorosis is a cosmetic condition that affects the teeth. Itâs caused by overexposure to fluoride during the first eight years of life. This is the time when most permanent teeth are being formed. After the teeth come in, the teeth of those affected by fluorosis may appear mildly discolored.
The eye that shows up in mature hurricanes represents the center of the storm. Counterintuitively to some, the eye represents an area of the hurricane where there is little to no precipitation, the sun or stars can be visible for a time, and the winds are light.Also within the eye is the lowest barometric pressure associated with the hurricane.The eye of a hurricane can range in size from about 5 miles (8 km) up to as wide as 120 miles (200 km) in diameter; however, a typical size is usually about 20-40 miles (30-60 km).he eye that shows up in mature hurricanes represents the center of the storm. Counterintuitively to some, the eye represents an area of the hurricane where there is little to no precipitation, the sun or stars can be visible for a time, and the winds are light.
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.