San Francisco Bay Shoreline and San Francisco Peninsula Coast are under an updated weather alert for strong thunderstorms by the National Weather Service on Monday at 10:58 a.m. The alert is in effect until 11:15 a.m.
The storms could bring pea-sized hail (0.25 inches) and wind gusts of up to 40 mph.
“At 10:58 a.m., Doppler radar tracked a strong thunderstorm near Millbrae, moving northeast at 25 mph,” according to the NWS San Francisco CA. “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 San Mateo, Pacifica, Burlingame, Millbrae, Half Moon Bay, Hillsborough, El Granada and Montara.
According to the NWS, “Monitor the weather situation closely and be alert for threatening weather conditions. Storms will be capable of producing large quantities of accumulating hail. This may result in slick and hazardous driving conditions. Slow down and use caution if driving.”
Preparing for approaching lightning: Expert safety advice
Lightning strikes the United States approximately 25 million times each year, with the bulk of these electrical discharges occurring during the summer months. Tragically, lightning claims the lives of about 20 individuals annually, as reported by the NWS. The risk of lightning-related incidents escalates as thunderstorms draw near, reaching its peak when the storm directly looms overhead. However, it gradually recedes as the tempest moves away.
To protect yourself during a thunderstorm, take these recommendations into consideration:
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 shelter promptly in a safe location, preferably indoors.
Indoors safety measures:
- Once you’ve found shelter indoors, abstain from using corded phones, electrical appliances, or plumbing fixtures, and refrain from approaching windows and doors.
- These precautions help reduce the risk of electrical surges, as lightning can follow conductive pathways.
Wait for the all-clear:
- After the last lightning strike or thunderclap, wait at least 30 minutes before resuming outdoor activities.
- Lightning can strike even when a storm has seemingly 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 with a group, ensure individuals are spread 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. While water and metal don’t attract lightning, they conduct electricity effectively and can pose significant risks.
In summary, when facing the threat of lightning, vigilance and preparedness are your best allies. By following these guidelines, you can significantly reduce the chances of lightning-related accidents and prioritize your safety.
Driving through downpours: Safety guidelines for wet roads
Heavy rainfall may lead to flooding if prolonged or if there is excessive runoff. Excessive runoff can be a result of saturated ground and/or rainfall intensity. Follow these recommendations from the NWS to stay safe in heavy rain:
Beware of rapid water flow:
During heavy rain, avoid parking or walking near culverts or drainage ditches, where swift-moving water can pose a serious risk.
Maintain safe driving distances:
Use the two-second rule to maintain a safe distance from the car in front of you and allow an extra two seconds in heavy rain.
Slow down and stay cautious:
On wet roads, reducing your speed is crucial. Ease off the gas pedal gradually and avoid abrupt braking to prevent skidding.
Choose your lane wisely:
Stay toward the middle lanes – water tends to pool in the outside lanes.
Visibility matters:
Enhance your visibility in heavy rain by activating your headlights. Be particularly vigilant 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 quickly and safely.
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.