Extreme Heat Watch

* WHAT...Dangerously hot conditions possible. Afternoon temperatures 109 to 115. Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

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

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

* IMPACTS...Heat related illnesses increase significantly during extreme heat events.