LANDSLIDE ADVISORY – a general statement about the potential of landslide activity in a given region relative to developing rainfall predictions. An advisory may include general statements about rainfall conditions that can lead to debris-flow activity, and list precautions to be taken in the event of heavy rainfall.
LANDSLIDE WATCH – means that landslide-activity will be possible, but is not imminent. People in, or planning to travel through, a watch area should check preparedness and stay informed about developing weather patterns.
LANDSLIDE WARNING – indicates that landslide activity is presently occurring and extreme caution should be taken.
FLOOD WATCH – means that an overflow of water from a river is possible for your area.
FLASH FLOOD WATCH – means that flash flooding is possible in or close to the watch area. Flash Flood Watches can be put into effect for as long as 12 hours, while heavy rains move into and across the area.
FLOOD WARNING – means flooding conditions are actually occurring in the warning area.
FLASH FLOOD WARNING – means that flash flooding is actually occurring in the warning area. A warning can also be issued as a result of torrential rains, a dam failure or snow thaw.
URBAN and SMALL STREAM ADVISORY– means flooding of small streams, streets and low-lying areas, such as railroad underpasses and urban storm drains is occurring.
DEBRIS – The scattered remains of something broken or destroyed; rubble or wreckage.
DEBRIS FLOW – A churning, water-saturated mass of rock, soil and organic matter that rushes down mountain slopes, typically originating as a landslide.
GRAVITY – The natural force of attraction exerted by a celestial body, such as Earth, upon objects at or near its surface, tending to draw them toward the center of the body.
FRICTION – Force that resists the relative motion or tendency to such motion of two bodies in contact.
TRIGGER – An event that initiates a landslide.
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