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SEVERE THUNDERSTORM WATCH: Indicates that conditions are favorable for lightning, damaging winds greater than 58 miles an hour and hail and/or heavy rainfall.
SHELTER PERIOD: The period in which people are forced to evacuate their homes. This time may vary from several hours to a couple of days depending upon the severity of the hurricane.
SHUTTERS: A physical wind barrier that is affixed over the outside of windows and/or doors to protect these vulnerable areas during a tropical storm. These products are classified by the styles of panel, accordion, or rolling and are manufactured from steel, aluminum, plastic or plywood.
SLOSH (SEA, LAKE AND OVERLAND SURGES FROM HURRICANES): A computerized model that is able to estimate the overland tidal surge heights and winds that result from hypothetical hurricanes with selected characteristics in pressure, size, forward speed, track and winds. The resultant tidal surge is then applied to a specific locale's shoreline, incorporating the unique bay and river configurations, water depths, bridges, roads and other physical features. The model estimates open coastline heights as well as surge heights over land, thus predicting the degree of propagation or run-up of the surge into inland areas.
SMALL CRAFT ADVISORY: An advisory issued for marine interests, especially for operators of small boats or other vessels. Conditions include wind speeds between 20 knots (23 mph) and 34 knots (39 mph). Issued up to 12 hours ahead of conditions.
SPECIAL MARINE WARNING: A warning for hazardous weather conditions, usually short and not adequately covered by existing marine warnings. Such conditions include sustained winds or gusts of 35 knots or more for 2 hours or less.
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