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Flood watch affecting Los Angeles County until Thursday evening

March 12, 2025

Los Angeles County is included in a flood watch issued by the National Weather Service on Wednesday at 2:53 a.m. The watch is valid from 6 p.m. until Thursday, Mar. 13 at 6 p.m.

According to the NWS Los Angeles/Oxnard CA, “Flash flooding and debris flows caused by excessive rainfall are possible.”

“Potential for heavy rain over the burn scars may trigger hazardous and damaging flooding and debris flows. Flooding may also occur in poor drainage and urban areas,” the NWS said. “You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.”

The full list of affected locations includes:

5 Freeway corridor near Santa Clarita
Catalina/Santa Barbara Islands
Santa Clarita Valley
Santa Barbara County Southwestern Coast
Santa Barbara County Southeastern Coast
Santa Ynez Mountains Western Range
Santa Ynez Mountains Eastern Range
Ventura County Beaches
Ventura County Inland Coast
Lake Casitas
Ojai Valley
Central Ventura County Valleys
Malibu
Los Angeles County Beaches
Palos Verdes Peninsula
Los Angeles County Inland Coast including Downtown Los Angeles
Western Santa Monica Mountains Recreational area
Eastern Santa Monica Mountains Recreational area
Calabasas/Agoura Hills
San Fernando Valley
Southeastern Ventura County Valleys
Santa Susana Mountains
Western San Gabriel Mountains/Highway 14 Corridor
Eastern San Gabriel Mountains
San Gabriel Valley

Deciphering advisories, watches, and warnings: Understanding weather alerts

Flash flood warning: Take action!

A flash flood warning is issued when a flash flood is imminent or occurring. If you are in a flood-prone area, move immediately to high ground. A flash flood is a sudden violent flood that can take from minutes to hours to develop. It is even possible to experience a flash flood in areas not immediately receiving rain.

Flood warning: Take action!

A flood warning is issued when flooding is imminent or occurring.

Flood advisory: Be aware:

A flood advisory is issued when flooding is not expected to be bad enough to issue a warning. However, it may cause significant inconvenience, and if caution is not exercised, it could lead to situations that may threaten life and/or property.

Flood watch: Be prepared:

A flood watch is issued when conditions are favorable for flooding. It doesn’t guarantee that flooding will occur, but it signifies that the possibility exists.

Weathering the storm: Flood safety guidelines from the NWS

Floods can pose a significant threat, especially if you live in a flood-prone area or find yourself camping in a low-lying region. To ensure your safety, the NWS offers essential flood safety guidelines:

Seek higher ground:

If you’re in a flood-prone area, or if you’re camping in a low-lying spot, move to higher ground as a first step.

Adhere to evacuation orders:

When local authorities issue an evacuation order, promptly comply. Before leaving, secure your home by locking it.

Disconnect utilities and appliances:

If time allows, disconnect your utilities and appliances. This reduces the risk of electrical hazards during flooding.

Steer clear of flooded basements and submerged areas:

Avoid basements or rooms submerged in water with electrical outlets or cords. Preventing electrical accidents is crucial.

Swift evacuation for your safety:

If you notice sparks or hear buzzing, crackling, snapping, or popping sounds, evacuate without delay. Do not enter water that may carry an electrical charge.

Refrain from walking in floodwaters:

Never attempt to walk through floodwaters, even if they appear shallow. Just 6 inches of fast-moving water can forcefully sweep you off your feet.

Seek high ground if trapped:

Should you become trapped by moving water, reach the highest point possible and dial 911 to contact emergency services.

When heavy rain occurs, there is a potential for flooding, particularly in areas that are low-lying or prone to floods. It is crucial to never drive through water on the road, even if it appears shallow. According to the NWS, as little as 12 inches of fast-flowing water can carry away most vehicles. Prioritize your safety by staying informed and prepared.

Driving through downpours: Safety guidelines for wet roads

When heavy rain strikes, safety is paramount. Equip yourself with these guidelines from the NWS to navigate wet roads and avoid hazards:

Beware of rapid water flow:

Avoid parking or walking in close proximity to culverts or drainage ditches, as the swiftly moving water during heavy rain can potentially carry you away.

Maintain safe driving distances:

Use the two-second rule to maintain a safe distance from the car in front of you and allow an extra two seconds in heavy rain.

Reduce speed and drive cautiously:

On wet roads, reducing your speed is crucial. Ease off the gas pedal gradually and avoid abrupt braking to prevent skidding.

Choose your lane wisely:

Stay toward the middle lanes – water tends to pool in the outside lanes.

Prioritize visibility:

Enhance your visibility in heavy rain by turning on your headlights. Watch out for vehicles in blind spots, as rain-smeared windows can obscure them.

Watch out for slippery roads:

The initial half-hour of rain is when roads are slickest due to a mixture of rain, grime, and oil. Exercise heightened caution during this period.

Keep a safe distance from large vehicles:

Large trucks and buses can reduce your visibility with tire spray. Avoid tailgating and pass them swiftly and safely.

Mind your windshield wipers:

Heavy rain can overload the wiper blades. When visibility is so limited that the edges of the road or other vehicles cannot be seen at a safe distance, it is time to pull over and wait for the rain to ease up. It is best to stop at rest areas or other protected areas.
If the roadside is your only option, pull off as far as possible, preferably past the end of a guard rail, and wait until the storm passes. Keep your headlights on and turn on emergency flashers to alert other drivers of your position.

By following these safety measures, you can significantly reduce risks and ensure your well-being when heavy rain pours down. Stay informed about weather conditions and heed advice from local authorities to make your journey safe and sound.

Flood watch affecting Los Angeles County until Thursday evening Orange County Register

News Details

Flood watch affecting Los Angeles County until Thursday evening

Deciphering advisories, watches, and warnings: Understanding weather alerts

Weathering the storm: Flood safety guidelines from the NWS

Driving through downpours: Safety guidelines for wet roads

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