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This Free Heat Warning System Could Help You Prepare for Dangerous Summer Conditions

The risks of heat are only growing thanks to lasting heat waves, extreme nighttime temperatures and unusual humidity, like the current «corn sweat» in the Midwest.

A massive heat dome is gripping much of the US again this week, with the Midwest facing a brutal combination of scorching temperatures and stifling humidity due in part to so-called «corn sweat,» or the extra moisture crops release into the air. This added humidity is pushing heat indexes well above 100 degrees across parts of the Corn Belt and beyond, compounding the risks for millions under excessive heat warnings and advisories.

The extreme heat bearing down across the US this summer can have a serious impact on public health. Excess heat can exacerbate common health conditions, but it can also mess with your air conditioning, overheat phones and cause meltdowns for other tech. If you live in an area at risk for extreme heat, or know someone who does, you can sign up for a free alert system to help you prepare. The HeatRisk tool from the National Weather Service can send personalized warnings straight to your inbox, giving you advance notice when dangerously high temperatures are headed your way.

HeatRisk is free to use and you’ll want to keep tabs on it to avoid heat safety issues, such as heatstroke, dehydration or fatigue. Here’s how to use it and why you should. 

Read more: This CDC Tool Can Help You Track Heat Risks on Trips and in Your Area

What is NWS HeatRisk?

NWS HeatRisk is a clickable map of the US, which is used to forecast extreme heat and assess the impact of that weather on public health. You can click anywhere on the interactive map and pull up a seven-day forecast of risk assessments for any city, town or area. 

The threat assessment is built on a five-level system that’s color-coded for severity, with green representing little to no risk and magenta representing the highest risk. The map will display a seven-day forecast for anywhere in the country, along with the color of the health threat level.

The system also considers how unusual the heat is for your area, how long the heat is expected to last and how it could affect people who are more vulnerable, such as older adults, kids or outdoor workers.

Read more: Super Common Health Conditions Can Make a Heat Wave More Dangerous: Here’s How to Prepare

Threat colors

NWS HeatRisk has five levels, each with a different color that corresponds to the size of the health risk:

0: Green

According to the NWS tool, there’s little to no risk involved with the forecasted heat at the green level.

1: Yellow

At the yellow level, there’s a minor risk for people who are extremely sensitive to heat.

2: Orange

The orange level represents a moderate risk to the general public, with potential danger to health systems and heat-sensitive industries.

3: Red

Red means there’s a major risk to anyone without access to immediate cooling and hydration, with likely impacts to health systems and heat-sensitive industries.

4: Magenta

The most extreme level is magenta. It’s both a rare occurrence and one that’s of long duration, with no overnight relief and is likely to affect health systems, heat-sensitive industries and infrastructure.

How to sign up for heat risk alerts 

To get free heat warnings, go to Heat.gov, enter your ZIP code and sign up for email or text alerts. You’ll get daily updates when your area faces extreme heat levels that could pose a health risk. 

Signing up for alerts is a quick step that could help you plan ahead, from adjusting outdoor activities to checking on family or neighbors, or just opting to stay hydrated and inside.

Other ways to track heat risks

Similar to NWS HeatRisk, a tool from the US Centers for Disease Control and Prevention called the HeatRisk Dashboard gives you a seven-day forecast to assess the potential health impact from extreme heat. 

Data Explorer is another tool from the CDC’s Environmental Public Health Tracking Program, which offers further HeatRisk information and assessment resources for COVID-19 and other illnesses.

Read more: Here’s How to Keep Your Kitchen Cool (and Lower Your Energy Bill) During a Heat Wave

Why extreme heat warnings matter 

Summer 2025 has already been a scorcher in many parts of the country. It’s important to stay diligent since extreme heat is the deadliest weather hazard in the US, causing more deaths each year than hurricanes, floods or tornadoes. 

The risks of heat are only growing. Heat waves are lasting longer, nighttime temperatures are staying high and unusual humidity — like the current «corn sweat» in the Midwest — can make it even harder for your body to cool down.

Staying informed is one of the easiest ways to protect yourself and your loved ones. Along with signing up for alerts, the CDC recommends learning the signs of heat-related illnesses, drinking plenty of water and never leaving children or pets in cars.

For more ways to stay safe this summer, check out CNET’s guide to the best portable AC units, tips for cooling down this summer and how to make your home more heat-resilient.

Technologies

Kohler Wants to Put a Tiny Camera in Your Toilet and Analyze the Contents

The company’s new Dekoda toilet accessory is like a little bathroom detective.

Some smart litter boxes can monitor our pets’ habits and health, so having a camera in our human toilet bowls seems inevitable. That’s just what kitchen and bathroom fixture company Kohler has done for its new health and wellness brand, Kohler Health

The $599 Dekoda clamps over the rim like a toilet bowl cleaner, pointing an optical sensor at your excretions and secretions. It then analyzes the images to detect any blood and reviews your gut health and hydration status. Depending on the plan you choose, the subscription fee is between $70 and $156 per year.


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At toilet time, you sign in via a fingerprint sensor so that the device knows who’s using the facilities. (Please wash your hands before signing out or tracking your progress.) Then, check in with the app for the day’s analysis and trends over time. 

Wait until you’re off the pot, though, before you start doomscrolling your health. The device has a removable, rechargeable battery and uses a USB connection. 

Kohler says it secures your data via the aforementioned fingerprint scanner and end-to-end encryption, and notes that the camera uses «discreet optics,» looking only at the results, not your body parts. 

«Dekoda’s sensors see down into your toilet and nowhere else,» the company says. 

Kohler warns that the technology doesn’t work very well with dark toilet colors, which makes sense. I’m sure there could be an upsell model with a light on it. Maybe the company could add an olfactory sensor, since smell reveals a lot about your gut health too. It could track «session» length or buildup under the rim to alert whoever has responsibility to clean it.

Kohler must have been straining to find appropriate lifestyle photos to include with the publicity materials. Many of the images are hilarious, featuring fit-looking men and women drinking water and staring off into space contemplatively — probably thinking about gas.

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Technologies

Who’s Up to Fight Mega-Corporations in the Outer Worlds 2 on Xbox Game Pass?

Save the universe by fighting one CEO at a time in The Outer Worlds 2, plus play other great games coming to Xbox Game Pass in October.

Space is the final frontier, and it’s packed with some devious mega-corporations who are out to make a buck in The Outer Worlds 2. Xbox Game Pass subscribers can fight them in the highly anticipated sequel starting on Oct. 29.

Xbox Game Pass offers hundreds of games you can play on your Xbox Series X, Xbox Series S, Xbox One, Amazon Fire TV, smart TV and PC or mobile device, with prices starting at $10 a month. While all Game Pass tiers offer you a library of games, Game Pass Ultimate ($30 a month) gives you access to the most games, as well as Day 1 games, like Hollow Knight: Silksong, added monthly.

Here are all the games subscribers can play on Game Pass soon. You can also check out other games the company added to the service in October, including Ninja Gaiden 4.


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PowerWash Simulator 2

Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 23.

If you’ve ever spent hours watching people on YouTube clean dirty rugs, cars and other grimy objects, you should check out PowerWash Simulator 2. As the name suggests, this sequel is all about blasting away dirt and filth from pools, homes and other objects around town. You have a furry kitty companion, and yes, you can pet them when you’ve finished cleaning.

Bounty Star

Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 23.

The American Southwest has devolved into a lawless, post-apocalyptic desert called the Red Expanse in this game. You’re out to clean the place up in this game by taking down major bounties issued by the government, and the best way to do that is by piloting and customizing a giant mech, of course. When you want to nurse your wounds, head back to your run-down garage to rest, grow and cook food and raise animals. It’s like a cozy Armored Core game.

Super Fantasy Kingdom (game preview)

Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 24.

After returning from a hunting trip, you find your 8-bit kingdom wrecked in this game. You must rebuild your domain in this roguelite, city builder. But as night falls, hordes of monsters emerge to tear everything back down. Build, mine, cook and grow your home, and prepare to defend it from all dangers.

Halls of Torment

Game Pass Ultimate, Game Pass Premium and PC Game Pass subscribers can start playing on Oct. 28.

Get ready to descend into the deadly Halls of Torment in this retro, horde survival game. You can choose between 11 playable characters, each with their own playstyle, and equip various items and abilities to survive waves of enemies. This game is like Vampire Survivors, so if you like that game give this one a shot.

The Outer Worlds 2

Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 29.

Clear your calendar for this sequel to the award-winning sci-fi adventure, The Outer Worlds. This time, you’re an Earth Directorate agent investigating the cause of devastating rifts that could destroy humanity. You have a new ship, new crew, new enemies and mega-corporation goons standing between you and the answers. 

1000xResist

Game Pass Ultimate, Game Pass Premium and PC Game Pass subscribers can start playing on Nov. 4.

One thousand years in the future, humanity is hanging on by a thread after a disease spread by alien occupation forces people to live underground in this sci-fi adventure game. You play as Watcher, and you fulfill your duties well, until one day you make a shocking discovery. This game won a Peabody Award in 2024, and it was nominated for the Nebula Award for Best Game Writing that same year, so get ready for a story like no other.

Football Manager 26

Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 29.

Get ready for a more immersive matchday experience in the latest installment of the Football Manager franchise. You can build a star-studded squad with new transfer tools, and this entry features official Premier League licenses and women’s football for the first time in the series’ history.

Game Pass subscribers can play the standard or Console edition of this game. 

Games leaving Game Pass on Oct. 31

While Microsoft is adding those games to Game Pass, it’s also removing three others from the service on Oct. 31. So you still have some time to finish your campaign and any side quests before you have to buy these games separately.

Jusant 
Metal Slug Tactics 
Return to Monkey Island

For more on Xbox, discover other games available on Game Pass now and check out our hands-on review of the gaming service. You can also learn about recent changes to the Game Pass service.

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Technologies

Does Charging Your Phone Overnight Damage the Battery? We Asked the Experts

Modern smartphones are protected against overcharging, but heat and use habits can still degrade your battery over time.

Plugging your phone in before you head to bed might seem like second nature. That way by the time  your alarms go off in the morning, your phone has a full charge and is ready to help you conquer your day. However, over time, your battery will start to degrade. So is keeping your phone plugged in overnight doing damage to the battery?

The short answer is no. Keeping your phone plugged in all the time won’t ruin your battery. Modern smartphones are built with smart charging systems that cut off or taper power once they’re full, preventing the kind of «overcharging damage» that was common in older devices. So if you’re leaving your iPhone or Android on the charger overnight, you can relax.

That said, «won’t ruin your battery» doesn’t mean it has no effect. Batteries naturally degrade with age and use, and how you charge plays a role in how fast that happens. Keeping a phone perpetually at 100% can add extra stress on the battery, especially when paired with heat, which is the real enemy of longevity. 

Understanding when this matters (and when it doesn’t) can help you make small changes to extend your phone’s lifespan.


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The science behind battery wear

Battery health isn’t just about how many times you charge your phone. It’s about how it manages voltage, temperature and maintenance. Lithium-ion batteries age fastest when they’re exposed to extreme levels: 0% and 100%. 

Keeping them near full charge for long stretches puts additional voltage stress on the cathode and electrolyte. That’s why many devices use «trickle charging» or temporarily pause at 100%, topping up only when needed.

Still, the biggest threat isn’t overcharging — it’s heat. When your phone is plugged in and running demanding apps, it produces heat that accelerates chemical wear inside the battery. If you’re gaming, streaming or charging on a hot day, that extra warmth does far more harm than leaving the cable plugged in overnight.

Apple’s take

Apple’s battery guide describes lithium-ion batteries as «consumable components» that naturally lose capacity over time. To slow that decline, iPhones use Optimized Battery Charging, which learns your daily routine and pauses charging at about 80% until just before you typically unplug, reducing time spent at high voltage.

Apple also advises keeping devices between 0 to 35 degrees Celsius (32 to 95 degrees Fahrenheit) and removing certain cases while charging to improve heat dissipation. You can read more on Apple’s official battery support page.

What Samsung (and other Android makers) do

Samsung offers a similar feature called Battery Protect, found in One UI’s battery and device care settings. When enabled, it caps charging at 85%, which helps reduce stress during long charging sessions.

Other Android makers like Google, OnePlus and Xiaomi include comparable options — often called Adaptive Charging, Optimized Charging or Battery Care — that dynamically slow power delivery or limit charge based on your habits. These systems make it safe to leave your phone plugged in for extended periods without fear of overcharging.

When constant charging can hurt

Even with these safeguards, some conditions can accelerate battery wear. As mentioned before, the most common culprit is high temperature. Even for a short period of time, leaving your phone charging in direct sunlight, in a car or under a pillow can push temperatures into unsafe zones.

Heavy use while charging, like gaming or 4K video editing, can also cause temperature spikes that degrade the battery faster. And cheap, uncertified cables or adapters may deliver unstable current that stresses cells. If your battery is already several years old, it’s naturally more sensitive to this kind of strain.

How to charge smarter

You don’t need to overhaul your habits but a few tweaks can help your battery age gracefully. 

Start by turning on your phone’s built-in optimization tools: Optimized Battery Charging on iPhones, Battery Protect on Samsung devices and Adaptive Charging on Google Pixels. These systems learn your routine and adjust charging speed so your phone isn’t sitting at 100% all night.

Keep your phone cool while charging. According to Apple, phone batteries perform best between 62 and 72 degrees Fahrenheit (16 to 22 degrees Celsius). If your phone feels hot, remove its case or move it to a better-ventilated or shaded spot. Avoid tossing it under a pillow or too close to other electronics, like your laptop, and skip wireless chargers that trap heat overnight.

Use quality chargers and cables from your phone’s manufacturer or trusted brands. Those cheap «fast-charge» kits you find online often deliver inconsistent current, which can cause long-term issues.

Finally, don’t obsess over topping off. It’s perfectly fine to plug in your phone during the day for short bursts. Lithium-ion batteries actually prefer frequent, shallow charges rather than deep, full cycles. You don’t need to keep it between 20% and 80% all the time, but just avoid extremes when possible.

The bottom line

Keeping your phone plugged in overnight or on your desk all day won’t destroy its battery. That’s a leftover myth from a different era of tech. Modern phones are smart enough to protect themselves, and features like Optimized Battery Charging or Battery Protect do most of the heavy lifting for you.

Still, no battery lasts forever. The best way to slow the inevitable is to manage heat, use quality chargers and let your phone’s software do its job. Think of it less as «babying» your battery and more as charging with intention. A few mindful habits today can keep your phone running strong for years.

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