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SPIRAL RAINBANDS: Bands of thunderstorms that spiral inward towards the center, where they wrap themselves around the eye.
SQUALL: A sudden increase of wind speed by at least 18 miles per hour (16 knots) and rising to 25 miles per hour (22 knots) or more and lasting for at least one minute.
STANDARD SURFACE PRESSURE: The measurement of one atmosphere of pressure under standard conditions. It is equivalent to 1,013.25 millibars, 29.92 inches of mercury, 760 millimeters of mercury, 14.7 pounds per square inch, or 1.033 grams per square centimeter.
STATE OF EMERGENCY: A declaration made by the Chief Elected Official of a State, County or City government which entails a heightened level of activation and mobilization of staff to protect property and lives.
STATIONARY FRONT: The boundary between two air masses, neither of which is replacing the other.
STATUTE MILE: Commonly known as a ground mile.
STORM: An individual low-pressure disturbance, complete with winds, clouds, and precipitation. Examples include thunderstorms, tornadoes, or even tropical cyclones. The name is associated with destructive or unpleasant weather
STORM SURGE: An abnormal rise in sea level accompanying a hurricane or other intense storm, and whose height is the difference between the observed level of the sea surface and the level that would have occurred in the absence of the cyclone. Storm surge is usually estimated by subtracting the normal or astronomic high tide from the observed storm tide. Note: waves on top of the storm surge will create an even greater high-water mark.
STORM TIDE: The actual level of seawater resulting from the astronomic tide combined with the storm surge. If the storm comes ashore during astronomical low tide, the surge will be decreased by the amount of the low tide. If the storm makes landfall during astronomical high tide, the surge will be that much higher.
STORM TRACKS: The path or tracks generally followed by a cyclonic disturbance.
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