Extreme Heat Warning: Parker Valley; Kofa; Yuma; Central La Paz; Gila River Valley; Imperial County Southwest; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley

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Extreme Heat Warning — Parker Valley; Kofa; Yuma; Central La Paz; Gila River Valley; Imperial County Southwest; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley Severity: Severe. Certainty: Likely. * WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 117 expected. Major Heat Risk. * WHERE...Portions of southwest Arizona and southeast and southern California. * WHEN...From 10 AM MST /10 AM PDT/ this morning to 8 PM MST /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.