Halloween night is shaping up to be a soggy, spooky mess for millions across the American West. The National Weather Service (NWS) has issued advisories for parts of California, Idaho, Nevada, Oregon, and Wyoming, where a potent storm system is expected to unleash up to 4 inches of rain — a real trick for anyone planning to take the kids out for candy.
The culprit is a broad upper-level trough that's pulling subtropical moisture into the Southwest. This system will combine with a developing low-pressure wave between Hawaii and Baja California, which is now heading straight for southern California. The result: a one-two punch of rain that could trigger flash flooding in areas already saturated from recent storms.
“The low pressure wave approaching the Pacific coast will deliver a trick for the Southwest by late Halloween night as the second wave of rain reaches southern California,” the NWS said in a statement. “Rainfall will quickly expand north and northeastwards across the Southwest, Great Basin, and Four Corners.”
Forecasters are particularly concerned about upslope terrain, where rainfall amounts of 2 to 4 inches are possible. That, combined with already saturated soils, could lead to numerous instances of flash flooding. The NWS warns that the heaviest rain will likely fall in areas that are already vulnerable, so residents should stay alert and avoid any unnecessary travel during the storm.
By Monday, the system is expected to spin up a lee-side cyclone in the Central High Plains, bringing wet weather to the Heartland to kick off the work week. Isolated heavy rainfall is possible, and portions of the Central Rockies could see heavy snow on the back side of the system. So, while the West gets drenched, the eastern U.S. will continue to enjoy a dry pattern.
For those in the affected areas, it's crucial to have a Halloween safety plan that includes flood precautions. If you're out trick-or-treating, be aware of your surroundings and avoid flooded roads or trails. The NWS also reminds everyone not to drive through standing water — turn around, don't drown.
While the rain is a nuisance for Halloween plans, it's also a stark reminder of the power of nature. For those looking for a little shelter from the storm, maybe Paige Spiranac's Halloween costume will provide a fun distraction. Or, if you're more into sports, you might want to check out how Genie Bouchard's Britney Spears look is breaking the internet.
Stay safe, everyone, and don't let the rain spoil your Halloween spirit. With the right precautions, you can still have a spooktacular night — just make sure you've got your umbrella and waterproof costume ready.
