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Heat Exhaustion Comes Before Heat Stroke, but we're here to help with exclusive heat alerts.


From 32deg, heat exhaustion can develop. More importantly, the Humidex can reach 40 at which point the body can suffer with Heat Exhaustion or Heat Stroke.

Humidex is the measure temperature and humidity and gives a  "Temp feels like" sensation.  39 is our trigger for  heat alerts  Example: A temperature of 32 and a Humidity of 50% gives a Humidex of 40.

Before symptoms appear, you may develop a red rash (heat rash) or heat cramps. These muscle cramps can affect any muscle, but they usually happen in the arms or legs.

Heat exhaustion symptoms may include:

  1. Dizziness, light-headedness, blurred vision and headache.
  2. Fever
  3. Fatigue, weakness or fainting (syncope).
  4. Nausea and vomiting.
  5. Rapid, shallow breaths.
  6. Severe or excessive sweating and cold, clammy (damp) skin.
  7. Swollen ankles or swelling in the feet and hands (heat edema).
  8. Weak, fast heartbeat and low blood pressure when you stand up (orthostatic hypotension).

What causes heat exhaustion?

Usually, sweat cools your skin and acts like an air conditioner for your entire body. When active (especially in hot weather), your body works hard to regulate its core temperature. Heat exhaustion happens when your body temperature rises too high and your body can’t cool itself down.

During physical activity, your body loses fluids and electrolytes through sweat. Electrolytes are minerals (such as sodium and potassium) that help your body work the way it should. If your body loses too much fluid and sodium (salt) and you don’t replace them, you become dehydrated. Dehydration can lead to heat exhaustion.

This video is well worth a watch Drinking Water Is NOT the Best Way to Stay Hydrated

Lert Info has exclusive Heat Alerts.

Lert now sends exclusive real time heat alerts when three close locations reach 39degrees (Humidex).  You won't know what the temp is unless you have a thermometer so we're here to help.

These alerts are only sent to members on our email/ Txt service members. 

If you want to be included sign up for FREE - Register here.


Lert Info has been designed to provide safety alerts for the public. It is a private company that gets no Government funding.

It’s arguably NZ’s most comprehensive and advanced alert service.

We have our own Meteorological technician, our own programmers and our own networker who are passionate that you have the best service


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New Zealand

Email: 027 733 8528

Email: Stuart@Lert.co.nz

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