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Mon, July 22

Late start predicted for 2019 Arizona monsoon season

The three most important factors to avoid hydroplaning are tire tread depth, speed and the amount of water on the road. Driving at slower speeds can greatly improve your chances of making it through a storm safely. VVN file photo

The three most important factors to avoid hydroplaning are tire tread depth, speed and the amount of water on the road. Driving at slower speeds can greatly improve your chances of making it through a storm safely. VVN file photo

The towering, often terrifying thunderstorms that signal the start of Arizona’s monsoon season typically begin in mid-June and last through the end of September, but meteorologists say we’ll likely see a delayed start this year. The meteorology department at Embry-Riddle Aeronautical University in Prescott has predicted a much later start to the summer rainy season.

Monsoons in northern Arizona, for example, usually show up around the Fourth of July, but that could be delayed a couple of weeks, Embry-Riddle meteorologists said.

The word monsoon means a “seasonal reversal of wind.” For most of the year, winds in Arizona blow from the west, bringing mostly dry air, but during the summer, meteorologists say, the winds come from the south, bringing warmer and more humid air over the state.

But according to Embry-Riddle meteorologists, cooler waters in the Sea of Cortez – also called the Gulf of California – will likely delay the start of the 2019 monsoon.

With a delayed start comes more time to prepare for these storms, which can produce dangerous lightning, destructive winds and torrents of rain in mere minutes. Here are a few tips from utility companies, city officials and law enforcement officials for having a safe monsoon season.

Steer clear of downed power lines

Downed power lines can be hazardous to drivers and pedestrians.

“With the monsoons coming up, we get these big microbursts and it has the potential to knock our poles over,” said Scott Kahrs, Arizona Public Service lineman troubleshooter. “The most important thing is to stay away. Call 911, call us, and we’ll make sure the area is safe.”

Kahrs and APS demonstrated how dangerous touching downed power lines can be to people by sending electricity through a hotdog“We use 7,000 volts to energize the hot dog, but that’s less than one amp,” Kahrs said. “What you’d be exposed to with a real power line would be hundreds, maybe even thousands of times stronger than that.”

Avoid hydroplaning

As rainwater pools on roads, hydroplaning can become an issue.

Sgt. Tommy Thompson, Phoenix Police Department spokesman, said hydroplaning occurs when tire surfaces lose contact with the pavement, skimming over a film of water.

“It can happen with a water depth of less than a tenth of an inch of rain,” Thompson said. “It can also happen with speeds of about 35 miles per hour or higher.”

The first 10 minutes of rain can be the most dangerous, Thompson said. Dust, oil and other fluids that leak from cars daily rise to the road’s surface when the rain starts.

“Essentially, in the first 10 minutes you could be driving on an oil slick,” Thompson said.

The three most important factors to avoid hydroplaning are tread depth, speed and the amount of water on the road. Thompson said driving at slower speeds and avoiding driving on tires with low tread can greatly improve your chances of making it through the storm safely.

The best choice, however, is to avoid driving altogether during a monsoon storm.

“If you don’t have to drive in it, don’t,” Thompson said.

Flooding

Flash flooding can be a serious hazard to public safety. A flash flood in mid-July 2017 took the lives of nine people in north Phoenix.

According to the National Weather Service, it only takes on1 to 2 feet of water to float a vehicle, even an SUV.

The Phoenix Street Transportation Department has a mobile command center – filled with computers, chain saws, vacuums and other emergency equipment – to quickly clear areas hit by storms.

Street maintenance supervisor Carlos Diaz said the most important thing for people to know is that streets with “street flooded” signs should be avoided until the area is clear.

“There’s potential that there could be a hole in the street (hidden by standing water). If you see the area, just turn around and avoid it,” Diaz said.

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