Extreme Heat Watch

* WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 115 degrees possible. Localized Major Heat Risk.

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

* WHEN...From Wednesday morning through Thursday evening.

* 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.