Extreme Heat Warning: San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; San Bernardino County Mountains; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; San Gorgonio Pass Near Banning; Orange County Inland

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Extreme Heat Warning — San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; San Bernardino County Mountains; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; San Gorgonio Pass Near Banning; Orange County Inland Severity: Severe. Certainty: Likely. * WHAT...Hot and humid conditions with elevated overnight temperatures in the upper 60s and lower 70s. Highs in the low 90s for portions of inland Orange County, upper 90s to 100 in the San Diego valleys, 100 to 103 degrees in the Inland Empire, and upper 80s to 90s in the mountains. * WHERE...Orange County Inland Areas, Riverside County Mountains, San Bernardino County Mountains, San Bernardino and Riverside County Valleys-The Inland Empire, San Diego County Mountains, San Diego County Valleys, San Gorgonio Pass near Banning, and Santa Ana Mountains and Foothills. * WHEN...Until 8 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Those spending long periods outdoors will be at greater risk for heat health impacts.