(and with it, heat exhaustion and heatstroke)
Hot weather and exercise are the main causes of heat exhaustion and heatstroke. The heat index is not the same as the temperature—the index measures the air temperature plus the effects of humidity. A heat index of 90°F or higher is dangerous. Don’t go outside when the temperature and heat index are high. If possible, stay indoors in air-conditioned areas.
Don’t hesitate to call 911 if symptoms don’t improve or if a fever of 102°F or more exists after 30 minutes of initial treatment. Heat Stroke and heat exhaustion can make a person go into shock, faint, or have seizures.