Penny-sized hail expected with thunderstorms in North Texas Sunday

A report from the National Weather Service on Sunday at 4:47 a.m. warns of strong thunderstorms until 5:15 a.m. The alert is for Denton, Collin, Tarrant and Dallas counties.

The storms could bring penny-sized hail (0.75 inches) and wind gusts of up to 40 mph.

"At 4:47 a.m., Doppler radar tracked a strong thunderstorm near Irving, moving northeast at 60 mph," states the NWS. "Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible."

Locations impacted by the alert include Dallas, Arlington, Plano, Garland, Irving, Grand Prairie, Mesquite, McKinney, Carrollton, Richardson, Lewisville, Allen, Flower Mound, Rowlett, Euless, Bedford, Grapevine, Wylie, Coppell and The Colony. This includes the following highways: Interstate 35E between mile markers 423 and 448. Interstate 20 between mile markers 448 and 452. Interstate 30 between mile markers 26 and 60. Interstate 45 between mile markers 282 and 284.

The NWS adds, "If outdoors, consider seeking shelter inside a building."

This alert is in effect until 5:15 a.m.

How to react when facing a lightning hazard?

Lightning hits the United States approximately 25 million times annually. The majority of these strikes happen during the summer, causing around 20 fatalities each year, according to the NWS. The likelihood of lightning increases as a thunderstorm gets closer and reaches its highest point when the storm is directly overhead. This risk decreases as the storm moves away.

Here are suggestions for staying safe during a thunderstorm:

• To reduce the chance of being struck by lightning, when venturing outside, have a plan to get to a safer area.

• If the sky turns ominous and thunder can be heard, find a secure place for shelter.

• Once inside, avoid contact with corded phones, electrical equipment, plumbing, and windows and doors.

• Wait for 30 minutes after the last lightning or thunder before going back out.

If finding indoor shelter is not an option:

• Avoid open fields, hill peaks, or ridge tops.

• Keep a distance from tall, solitary trees or other elevated structures. When in a forest, stay in proximity to shorter tree groupings.

• If you are in a group, disperse to prevent the current from passing between group members.

• If you are camping in an open area, set up camp in a valley, ravine, or other low area. Remember, a tent offers no protection from lighting.

• Maintain a safe distance from water, wet items, and metal objects. Water and metal do not attract lightning, yet they conduct electricity efficiently.

What to do in the rain on the road?

• Turn on headlights — Even in daylight, using headlights can help improve visibility and let other drivers know where you are.

• While on the road — Opt for the middle lanes and remain on higher ground. Rainwater tends to gather along the road edges.

• Steer clear of puddles — Driving into puddles or low areas of rainwater can cause vehicles to hydroplane or skid out of control.

• Give ample space to large vehicles — Trucks or buses can create a water spray that diminishes visibility.

• Steer clear of flooded areas — When coming to a flooded road, turn around and head back. Flash flooding currents are strong and can sweep drivers off roadways. Driving through deep water can also affect a vehicle’s mechanical and electrical systems.

What is hydroplaning?

Hydroplaning is when a vehicle starts uncontrollably sliding on wet roads.

This happens when water in front of the tire builds up faster than the vehicle’s weight can push water out of the way. The water pressure then causes the vehicle to rise and slide on a thin layer of water between the tires and the road, making the driver lose control. The three main causes of hydroplaning are:

1. Vehicle speed — When a vehicle’s speed increases, the tire-traction grip and ability to control the vehicle decreases. Drive at a reduced speed during wet weather.

2. Water depth — The deeper the water, the sooner a vehicle loses traction on the road. It doesn’t matter how deep the water is, even a thin layer can lead to hydroplaning.

3. Tire tread depth — Checking your tire tread before hitting the road is important, as low or no tread can lead to sliding.

In the event of your vehicle hydroplaning, here’s what to know:

• Ease off the accelerator — Step off the gas to slow down the vehicle until the tires find traction.

• Turn into the skid — Turning into the skid can help the vehicle’s tires realign to regain control.

• Make sure the tires reconnect with the road — During the skid, wait until the tires reconnect with the road and then gently straighten the wheels to regain control.

• Brake gently as needed — Brake normally if the vehicle has anti-lock brakes and pump brakes gently if in an older vehicle.

Source: The National Weather Service