Yosemite, Mariposa Madera Foothills and Mariposa-Madera Lower Sierra are under a weather alert for strong thunderstorms by the National Weather Service on Friday at 12:24 p.m. The alert is in effect until 1 p.m.
Be ready for pea-sized hail (0.25 inches) and wind gusts of up to 40 mph.
“At 12:24 p.m., Doppler radar tracked a strong thunderstorm 7 miles northwest of Bootjack, or 19 miles west of Yosemite South Entrance, moving north at 20 mph,” the NWS Hanford CA said. “Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible.”
The alert is for Bootjack, Mariposa and Hodgdon Meadow Campground.
The NWS said, “If outdoors, consider seeking shelter inside a building. Conditions are favorable for the development of weak, brief funnel clouds. This type of funnel cloud is harmless, but on rare occasions they can briefly touch down, producing wind gusts over 50 mph. If a funnel cloud is spotted move indoors and report your sighting to the National Weather Service. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service.”
When lightning looms: Expert safety tips for thunderstorms
Each year, lightning strikes the United States approximately 25 million times, mostly during the summer. It claims the lives of about 20 people annually, according to the NWS. The threat of lightning becomes more pronounced as thunderstorms draw nearer, peaking when the storm is directly overhead and gradually waning as it moves away.
To ensure your safety during a thunderstorm, keep these recommendations in mind:
Lightning safety plan:
- When venturing outdoors, it’s crucial to have a lightning safety plan in place.
- Monitor the sky for threatening signs and listen for the sound of thunder. If thunder is audible, it’s an indication that lightning is nearby.
- Seek a safe place to shelter, preferably indoors.
Indoors safety measures:
- Once you’re indoors, avoid using corded phones, electrical devices, plumbing fixtures, and stay away from windows and doors.
- Lightning can follow conductive pathways, and these precautions reduce the risk of electrical surges.
Wait for the all-clear:
- After the last lightning strike or thunderclap, wait at least 30 minutes before resuming outdoor activities.
- It’s important to remember that lightning can strike even when a storm seems to have passed, so exercise caution.
When indoor shelter isn’t available:
If you find yourself outdoors with no access to indoor shelter during a thunderstorm, take these steps to maximize your safety:
- Avoid open fields, hilltops, or ridge crests, which expose you to greater lightning risk.
- Steer clear of tall, isolated trees and other prominent objects. In forested areas, stay close to lower stands of trees.
- If you’re in a group, ensure that individuals are spaced out to prevent lightning current from transferring between people.
- Camping in an open setting during a thunderstorm is strongly discouraged. If no alternative exists, set up camp in a valley, ravine, or other low-lying areas. Remember that a tent offers no protection against lightning.
- Do not approach water bodies, wet objects, or metal items. Although water and metal do not attract lightning, they conduct electricity effectively and can pose significant risks.
In summary, when facing the threat of lightning, preparedness and vigilance are your best allies. By following these guidelines, you can significantly reduce the likelihood of lightning-related incidents and prioritize your safety.
Mastering wet roads: Safety tips for heavy rainfall
When heavy rain pours, the risk of flooding and treacherous roads rises. Here’s your guide from the NWS to staying safe during downpours:
Beware of rapid water flow:
In heavy rain, refrain from parking or walking near culverts or drainage ditches, where swift-moving water can pose a grave danger.
Maintain safe driving distances:
The two-second rule for following distance is your ally in heavy rain. Extend it to four seconds to ensure safe spacing in adverse conditions.
Slow down and stay cautious:
On wet roads, reducing your speed is crucial. Ease off the accelerator gradually and avoid abrupt braking to prevent skidding.
Choose your lane wisely:
Stick to the middle lanes on multi-lane roads to minimize the risk of hydroplaning, as water tends to accumulate in outer lanes.
Visibility matters:
Enhance your visibility in heavy rain by turning on your headlights. Watch out for vehicles in blind spots, as rain-smeared windows can obscure them.
Watch out for slippery roads:
Be extra careful during the first half hour after rain begins. Grime and oil on the road surface mix with water to make the road slippery.
Keep a safe distance from large vehicles:
Don’t follow large trucks or buses too closely. The spray created by their large tires reduces your vision. Take care when passing them as well; if you must pass, do so with caution.
Mind your windshield wipers:
Overloaded wiper blades can hinder visibility. If rain severely limits your sight, pull over and wait for conditions to improve. Seek refuge at rest areas or protected spots.
If the roadside is your only option, pull off as far as possible, preferably past the end of a guard rail, and wait until the storm passes. Keep your headlights on and turn on emergency flashers to alert other drivers of your position.
In the face of heavy rain, these precautions can make a significant difference in ensuring your safety on the road. Remember to stay informed about weather conditions and heed guidance from local authorities for a secure journey.
For more local weather alerts, visit our Weather Advisory page