Look for damaging winds with thunderstorms in San Francisco and San Mateo counties Thursday
San Francisco and San Mateo counties are the focus of a severe thunderstorm warning released at 2:19 a.m. on Thursday by the National Weather Service. The warning is in effect until 2:45 a.m.
Residents should prepare for wind gusts of up to 70 mph.
“At 2:19 a.m., a severe thunderstorm was located over Daly City, moving northeast at 60 mph,” the NWS San Francisco CA said. “Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings.”
Locations impacted by the warning include San Francisco, Daly City, South San Francisco, San Bruno, Pacifica, Brisbane, Colma and Broadmoor.
The NWS said, “Tornadoes can develop quickly from severe thunderstorms. Seek shelter immediately in an interior room on the lowest floor of a well-built structure.”
Emergency alerts in the San Francisco Bay Area
All enabled mobile phones in the area will receive emergency alerts for “considerable or catastrophic” hazards. To monitor other local risk, residents are advised to sign up for county alert systems and to monitor agencies’ social media. Follow these instructions to enable your phone to receive Wireless Emergency Alerts (WEAs). To receive local alerts in the Bay Area, visit each county’s website:
Lightning on the horizon: Expert safety measures for thunderstorms
Lightning strikes the United States approximately 25 million times each year, mostly during the summer. Lightning claims the lives of about 20 people annually, according to 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
To ensure your safety during a thunderstorm, keep these recommendations in mind:
Lightning safety plan:
- When venturing outdoors, it’s vital to establish a clear plan for seeking shelter in case of lightning.
- 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’re indoors, avoid using corded phones, electrical devices, plumbing fixtures, and stay away from 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 without access to indoor shelter during a thunderstorm, take these steps to maximize your safety:
- Avoid open fields, hilltops, or ridge crests, as they expose you to greater lightning risk.
- Steer clear of tall, isolated trees and other prominent objects. In wooded 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. 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.
Driving through downpours: Safety guidelines for wet roads
Rain can turn roads into hazards. Stay informed and follow these tips from the NWS to ensure safety during heavy rainfall:
Beware of swollen waterways:
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:
Adhere to the two-second rule for maintaining a safe following distance behind the vehicle in front of you. In heavy rain, allow an additional two seconds of distance to compensate for reduced traction and braking effectiveness.
Slow down and stay cautious:
On wet roads, slowing down is paramount. Gradually ease off the accelerator 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:
Turn on your headlights and be careful of other vehicles to the rear and in blind spot areas as they are especially difficult to see through rain-spattered windows.
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:
Large trucks and buses can reduce your visibility with tire spray. Avoid tailgating and pass with caution.
Mind your windshield wipers:
Heavy rain can overload the wiper blades. When visibility is so limited that the edges of the road or other vehicles cannot be seen at a safe distance, it is time to pull over and wait for the rain to ease up. It is best to stop at rest areas or other protected areas.
When stopping by the roadside is your only option, position your vehicle as far off the road as possible, ideally beyond guardrails. Keep your headlights on and activate emergency flashers to alert other drivers of your position.
By following these safety measures, you can significantly reduce risks and ensure your well-being when heavy rain pours down. Stay informed about weather conditions and heed advice from local authorities to make your journey safe and sound.
For more weather alerts in the Bay Area, visit Weather Advisories