Raymarine SR100 User Manual
Page 28
25 Raymarine Sirius Weather System Installation Guide
Category 5
Winds greater than 155 mph (135 kt or 249 km/hr). Storm surge generally greater than 18 ft above normal. Complete roof fail
ure on many residences and industrial buildings. Some complete building failures with small utility buildings blown over or
away. All shrubs, trees, and signs blown down. Complete destruction of mobile homes. Severe and extensive window and door
damage. Low lying escape routes are cut by rising water 3 5 hours before arrival of the centre of the hurricane. Major damage
to lower floors of all structures located less than 15 ft above sea level and within 500 yards of the shoreline. Massive evacuation
of residential areas on low ground within 5 10 miles (8 16 km) of the shoreline may be required.
Isobar
A line on a weather map linking areas with equal air pressure.
Lightning
Discharge of static electricity in the atmosphere, usually between the ground and a storm cloud.
Low
Also called a 'depression' this region of low pressure can mean wet weather.
Low Pressure
A mass of air that presses down only weakly on the surface of the Earth’s surface as it is warmed and it therefore less dense.
Millibar
A unit used to measure atmospheric pressure.
Occluded Front
An area where warm air is pushed upwards as a cold front overtakes a warm front and pushes underneath it.
Precipitation
Moisture that is released from the atmosphere as rain, drizzle, hail, sleet or snow, as well as dew and fog.
Pressure Centre
A region of high or low pressure.
Term
Definition