Extreme Heat Warning

* WHAT...Dangerously hot conditions possible. Afternoon temperatures 109 to 114. Moderate to locally Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

* WHERE...Southwest Imperial County, and Imperial Valley.

* WHEN...From 10 AM Wednesday to 8 PM PDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.