Pineapple Express Brings Flood Risk to California This Halloween Weekend: What We Know
- National Weather Service — CA Alerts — current flood watches/warnings for your area
- Cal OES Emergency Alerts — state guidance on flood safety and evacuation
A Pineapple Express atmospheric river is bearing down on California right now, and forecasters are calling it a legitimate flood threat for the state and parts of the Southwest. If you're planning to take the kids out tonight, this is the storm to watch.
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The system is already spiking weather searches across the state as Californians try to figure out what Halloween night actually looks like. According to early reports, rain and storms are expected to affect more than 20 states tonight, with millions of trick-or-treaters getting a soggy holiday. California is squarely in the crosshairs of the heaviest activity.
This is a developing story. Conditions and timing may shift as the storm moves in.
What's a Pineapple Express?
The nickname refers to an atmospheric river that pulls a firehose of Pacific moisture from near Hawaii straight into the West Coast. These systems can dump serious rainfall fast, especially over burn scars and steep terrain, which is why flood watches tend to follow them. California has no shortage of vulnerable areas right now.
Halloween Night Outlook
Light to moderate rain looks likely for Halloween night across parts of California, according to early forecast reports. The exact timing matters a lot for trick-or-treating hours, and that's still being nailed down. Check your local National Weather Service office for the freshest updates before heading out. If you're in a low-lying area or near a creek, pay attention to any flood advisories that drop tonight.
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What You Should Do Now
Forecasters are treating this as a flood threat, not just a wet weekend. Have a backup plan for kids' costumes that can handle rain, and if you're in a spot that floods easily, keep tabs on local alerts. Don't drive through flooded roads. The National Weather Service and your county's emergency management office are the best places to track watches and warnings as this develops.
Stay with CALWIRE for updates as the storm moves through.