Weather Alert in California
Flood Advisory issued July 18 at 2:09PM PDT until July 18 at 5:00PM PDT by NWS Los Angeles/Oxnard CA
AREAS AFFECTED: Los Angeles, CA
DESCRIPTION: * WHAT...Minor debris flows along with rock and mud slides. Minor flooding caused by excessive rainfall is expected. * WHERE...A portion of southwest California, including the following locations, southeastern portions of the Bridge Burn Scar in northeast Los Angeles County. * WHEN...Until 500 PM PDT. * IMPACTS...Minor debris flows consisting of rock, mud, and debris. Minor landslides. Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 204 PM PDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. - Some locations that will experience flooding include... mainly rural areas of Eastern Los Angeles County that include southeastern portions of the Bridge Burn Scar in northeast Los Angeles. - http://www.weather.gov/safety/flood
INSTRUCTION: Be aware of your surroundings and do not drive on flooded roads. Residents living in or immediately downstream of heavy rains should closely monitor the latest information from the National Weather Service. Be prepared to take immediate precautions to protect life and property, and be prepared to quickly move away from the burn area only if it is safe to do so. Minor flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become killers in heavy rains. Campers and hikers should avoid streams or creeks.
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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