Extreme Heat Warning: San Juan and Vicinity; Northeast; Southeast; Eastern Interior; North Central; Central Interior; Ponce and Vicinity; Northwest; Western Interior; Mayaguez and Vicinity; Southwest

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Extreme Heat Warning — San Juan and Vicinity; Northeast; Southeast; Eastern Interior; North Central; Central Interior; Ponce and Vicinity; Northwest; Western Interior; Mayaguez and Vicinity; Southwest Severity: Severe. Certainty: Likely. * WHAT...This level of heat can affect anyone without effective cooling and/or adequate hydration. * WHERE...Portions of Puerto Rico, particularly across coastal and urban areas and lower-elevation valleys. * WHEN...From 10 AM this morning to 5 PM AST this afternoon. * IMPACTS...Heat-related illnesses increase significantly during periods of very high heat indices or high temperatures. This extreme heat event poses a severe threat to anyone with inadequate cooling or hydration. These extreme impacts will be most pronounced across coastal sections, lowlands, interior valleys, and urban areas. * ADDITIONAL DETAILS...Although passing showers, t-storms and clouds can provide some relief, enough sunshine and moisture is expected for heat indices to reach dangerous levels.