We're considering moving to the Las Vegas area from Oregon. We didn't mind the recent heat wave up here, but the wildfires are just too scary. Of course, everywhere has their disasters, but can you tell us what's the worst natural thing that could happen to us there if we moved.
Generally speaking, the worst natural acute event that happens here is flash flooding. At the same time, the worst natural chronic event is drought. Both involve water, of course, but the former is dangerous in the moment, while the latter threatens the long-term prospects of the city. Drought and the lack of water are an issue for another day. Today, we're considering short-term emergencies.
Even though the average rainfall in Las Vegas is 4.5 inches, the summer monsoon season can often account for a quarter of that in a single storm. Vegas is at the tail end of weather systems that blow in from the south/Gulf of California and the southeast/Gulf of Mexico. And because of the hard-packed desert soil, plus all the pavement in the city, the ground can’t absorb anywhere near that much heavy rainfall, so streets can get flooded very quickly.
It’s not like the flooding you see where rivers overflow and inundate entire towns and cities (which has happened in Reno over the years), but streets with depressions or troughs can accumulate three feet of runoff in places. The flood-control system throughout the valley has come a long way in the past 25 years, but flash floods can still be very dangerous when they hit.
And not just from the water. Due to how dry it is in southern Nevada the rest of the year, the roads absorb a lot of oil and other fluids. When the monsoon rains arrive, the oils separate out, making the roads extremely slick and causing the driving conditions to be a lot more treacherous than from wet roads alone.
Winds can also get fairly extreme in southern Nevada. Ferocious wind storms can achieve speeds of 80 miles per hour and more (hurricane-force winds start at 74 mph), delaying flights in and out, blowing over tractor-trailers, uprooting trees that block streets and knock down power lines, reducing visibility to nearly zero, causing widespread power outages, and destroying casino signs.
But unlike Phoenix, where intense dust storms known as “haboobs” blanket the city, can be 6,000 feet high and 100 miles long, and blot out the sun, Las Vegas is protected from those by the surrounding mountains.
Las Vegas also sits atop a number fault lines. Earthquakes, which we've covered in previous QoDs, can and do happen, but they’re mild and infrequent.
It snows in the valley on occasion; when it does, driving is fraught with danger, especially since most people aren't accustomed to it. But the snow doesn’t remain on the ground for long.
Tornadoes are rare, but do occur. The last one was on August 6, 2014; the one before that was on April 21, 2001. But they’re short-lived and register the lowest rating on the Enhanced Fujita scale.
Otherwise, temperatures can be extreme. The record high temperature of 117 degrees has been achieved five times; it’s hit 116 on 19 different days and 115 degrees 41 times.
The record coldest temperature is 8 degrees, registered on January 13, 1963. With the record high of 117, that’s a temperature swing of 109 degrees.
Granted, it's not as bad as Minnesota, for example, where swings of 120 degrees aren't uncommon, or Fairbanks, Alaska, where the record high was 99 degrees (2019) and the record low was -66 (1934). That's a swing of 165 degrees! Still, for Las Vegas, which many visitors tend to think never gets cold, 109 degrees of variance is fairly substantial.
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Jackie
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vegasdawn
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Donzack
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steve crouse
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jpfromla
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Rick Sanchez
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Kevin Lewis
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[email protected]
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David
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rokgpsman
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Sam Glantzow
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Doc H
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Jackie
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Doc H
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Jetpilotrick
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Ray
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Roy Furukawa
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Doc H
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Dave_Miller_DJTB
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