Extreme Heat Warning: Parker Valley; Yuma; Imperial County Southwest; Salton Sea; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley

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Extreme Heat Warning — Parker Valley; Yuma; Imperial County Southwest; Salton Sea; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley Severity: Severe. Certainty: Likely. * WHAT...Dangerously hot and humid conditions. Afternoon temperatures 106 to 116 expected. Overnight temperatures 85 to 91. Moderate to Major Heat Risk. * WHERE...In Arizona, Parker Valley and Yuma. In California, Chuckwalla Valley, Imperial County Southeast, Imperial County Southwest, Imperial County West, Imperial Valley, Palo Verde Valley, and Salton Sea. * WHEN...From 10 AM MST /10 AM PDT/ Tuesday 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.