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Marble-Sized Hail Pummels San Diego Mountains & Deserts
Severe Thunderstorm Alert: San Diego Mountains & Deserts – What You Need to Know
Alert Issued: Thursday, August 6, 2026 at 10:36 PM
Expires: 11:15 PM (same day)
Areas Affected: San Diego County Mountains & Deserts
Hazards: Marble-sized hail (0.5 inches) & wind gusts up to 50 mph
What’s Happening Right Now?
The National Weather Service (NWS) in San Diego has issued a Strong Thunderstorm Warning for the mountain and desert areas of San Diego County. Think of this like nature’s version of a "heads up!" text message — it’s telling you that rough weather is happening right now or about to happen very soon.
The Storm’s Current Location
At 10:36 PM, Doppler radar (that’s a fancy weather radar that can "see" rain and wind inside clouds) spotted a strong thunderstorm near Interstate 8 between Boulevard and the Imperial County Line. It’s moving west at 20 mph — about the speed of a casual bike ride.
Locations in the Warning Zone
If you’re in or traveling through any of these spots, pay extra attention:
- Highways: I-8 (Pine Valley to Boulevard, Boulevard to Imperial County Line), Hwy S2 (Canebrake to Imperial County Line, Vallecito Creek Rd)
- Communities: Boulevard, Campo, Live Oak Springs, Jacumba, Tierra Del Sol
- Reservations: La Posta Indian Reservation, Campo Indian Reservation, Manzanita Indian Reservation
- Landmarks: Southern Mount Laguna
IMPORTANT: If you’re outdoors in any of these areas, seek shelter inside a sturdy building immediately.
Lightning Safety: The "Don’t Get Zapped" Guide
Lightning strikes the U.S. about 25 million times per year. Most happen in summer, causing roughly 20 deaths annually. The danger is highest when the storm is right over you, and drops as it moves away.
4 Simple Steps if You’re Outside
- Have a plan — Before you even go out, know where the nearest safe building is
- Watch the sky — If it looks dark and you hear thunder, go inside NOW
- Once inside, avoid:
- Corded phones (cell phones are fine)
- Electrical appliances
- Plumbing (sinks, showers, tubs)
- Windows and doors
- Wait it out — Stay inside for 30 minutes after the last thunder clap
Caught Outside With No Building? Do This Instead:
- Avoid: Open fields, hilltops, ridge lines
- Stay away from: Tall, lonely trees or tall structures
- In a forest? Stick near shorter groups of trees
- With a group? Spread out — don’t huddle together (stops electricity from jumping between people)
- Camping? Pick a valley, ravine, or low spot — tents do NOT protect you from lightning
- Keep away from: Water, wet things, metal objects (they don’t attract lightning, but they conduct electricity really well)
Driving in Heavy Rain: Stay Safe on Wet Roads
5 Smart Habits for Rainy Driving
| Tip | Why It Matters |
|---|---|
| Turn on headlights | Helps YOU see and helps OTHERS see you — even in daylight |
| Stick to middle lanes | Water pools at road edges; higher ground = less water |
| Avoid puddles | They can hide deep water or cause hydroplaning (see below) |
| Give big trucks space | Their tires spray a wall of water that blinds you |
| NEVER drive through flooded roads | Turn around! Flash floods can sweep cars away; deep water ruins engines and electronics |
What Is Hydroplaning? (And How to Handle It)
Hydroplaning = Your tires lose contact with the road and skate on a layer of water. You lose steering and braking control. Scary? Yes. Manageable? Also yes.
Top 3 Causes
- Speed — Faster = less tire grip. Slow down in rain.
- Water depth — Even a thin sheet of water can do it. Deeper = worse.
- Worn tires — Low tread = can’t channel water away. Check your tires!
If Your Car Starts Hydroplaning — Follow These Steps:
- Ease off the gas — Don’t slam brakes! Just let the car slow naturally.
- Steer INTO the skid — Turn the wheel gently in the direction the back of the car is sliding. This helps tires regain grip.
- Wait for traction — You’ll feel the tires "bite" the road again.
- Straighten up gently — Once grip returns, smoothly center the wheel.
- Brake carefully:
- Anti-lock brakes (ABS)? Press firmly and hold.
- Older car without ABS? Pump the brake pedal gently.
Quick Summary: Your Action Checklist
- [ ] If outdoors → Get inside a building NOW
- [ ] If driving → Slow down, headlights on, avoid puddles & floods
- [ ] If hydroplaning → Off gas, steer into skid, wait, straighten, brake gently
- [ ] If no shelter → Low ground, away from trees/water/metal, spread out
- [ ] Wait 30 mins after last thunder before going back out
FAQ: Your Top Questions Answered
Q: How big is "marble-sized" hail really?
A: About 0.5 inches — roughly the size of a standard shooter marble or a pea. It can ding cars, shred plants, and hurt if it hits you.
Q: Can I just stay in my car during lightning?
A: A hard-top metal car is safer than being outside, but a building is much safer. If you’re in a car, pull over safely, turn off the engine, and avoid touching metal parts.
Q: What if I see a flooded road but it "doesn’t look that deep"?
A: Turn around anyway. Water depth is deceptive. Just 12 inches can float a small car; 24 inches can carry away most vehicles. The road underneath might also be washed out.
Q: Do rubber tires protect me from lightning in a car?
A: Nope! It’s the metal frame of the car that directs lightning around you (like a Faraday cage). Rubber tires don’t stop lightning — it just jumped miles through air; a few inches of rubber won’t slow it down.
Q: How do I know if my tires have enough tread?
A: The penny test: Stick a penny into the tread groove with Lincoln’s head upside down. If you can see all of his head, your tread is too low — time for new tires.
Source: National Weather Service (NWS) San Diego
Original Publication: August 6, 2026 at 10:37 PM
Generated by: United Robots California (AI-assisted, journalist-reviewed)
Stay safe, stay dry, and remember — when thunder roars, go indoors!
