The National Weather Service has issued a Flash Flood Watch for many parts of Southern California Thursday November 29 2018.
A Flash Flood Watch is in place for Orange County Inland Areas, Riverside County Mountains, San Bernardino County Mountains and Santa Ana Mountains and Foothills.
UPDATE at 9:45am Thursday November 29 2018
A Pacific storm will bring periods of moderate to locally heavy rainfall to Southern California Thursday November 29 2018.
The rain will become locally heavy in the morning and continue into early afternoon with isolated thunderstorms possible beginning late this morning.
The heaviest rainfall is expected with the cold frontal passage late this morning.
Hourly rainfall rates in stronger showers and isolated thunderstorms could approach one
half to one inch in an hour.
This could lead to mud slides and debris flows at recent burn scars. The time window of greatest concern is from mid morning through early afternoon and again for the evening hours as another round of more widespread showers and isolated thunderstorms is expected, decreasing late Thursday night.
There is the potential of flash flooding and debris flows at recent burn scar locations.
This includes the Holy Fire, Cranston Fire, Canyon 1 and 2 Fires, and the Valley Fire burn
NWS in Los Angeles on Recent Fires and Mudflow at 7:20am November 29 2018
Heavy rainfall could cause debris flows in recent burn areas according to rainfall thresholds provided by the USGS. Debris flows are extremely dangerous and happen suddenly often with
little time to act. It may even not be raining at your location to be impacted by a debris flow. You should monitor the latest forecasts. Heed any advice given from local authorities.
A Flash Flood Watch means that conditions may develop that lead to flash flooding.
Flash Flooding is a very dangerous situation.
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Build an emergency kit and make a family communications plan.
Elevate the furnace, water heater and electric panel in your home if you live in an area that has a high flood risk.
Consider installing “check valves” to prevent flood water from backing up into the drains of your home.
If feasible, construct barriers to stop floodwater from entering the building and seal walls in basements with waterproofing compounds.
Flood Safety Tips
Be aware that flash flooding can occur.
If there is any possibility of a flash flood, move immediately to higher ground.
Do not wait for instructions to move.
Flood Evacuation Tips
Turn off utilities at the main switches or valves if instructed to do so.
Disconnect electrical appliances.
Do not touch electrical equipment if you are wet or standing in water.
Secure your home.
If you have time, bring in outdoor furniture.
Move essential items to an upper floor.
Be aware of stream, drainage channels, canyons and other areas known to flood suddenly.
Flash floods can occur in these areas with or without typical warnings such as rain clouds or heavy rain.
Do not walk through moving water.
Six inches of moving water can make you fall.
If you have to walk in water, walk where the water is not moving.
Use a stick to check the firmness of the ground in front of you.
Do not drive into flooded areas.
If floodwaters rise around your car, abandon the car and move to higher ground if you can do so safely.
You and the vehicle can be swept away quickly.
Do not camp or park your vehicle along streams, rivers or creeks, particularly during threatening conditions.
For more information please visit The National Weather Service