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An excessive heat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least 105 °F (41 °C) for more than three hours per day for two consecutive days, or if the heat index is greater than 115 °F (46 °C) for any period of time.

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  • An excessive heat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least 105 °F (41 °C) for more than three hours per day for two consecutive days, or if the heat index is greater than 115 °F (46 °C) for any period of time. Note that local offices, particularly those where excessive heat is less frequent or in areas with deserts or mountainous terrain, often have their own criteria. High values of the heat index are caused by temperatures being significantly above normal and high humidity, and such high levels can pose a threat to human life through conditions such as heat stroke, heat exhaustion, and other heat-related illnesses. (en)
  • El Servicio Meteorológico Nacional de los Estados Unidos emite una advertencia de calor excesivo dentro de las 12 horas siguientes a que el índice de calor alcanza uno de los dos niveles de criterio. En la mayoría de las áreas, se emitirá una advertencia si hay un índice de calor de al menos 105 °F durante más de 3 horas al día durante 2 días consecutivos, o si el índice de calor es superior a 115 °F durante cualquier período de tiempo. Tenga en cuenta que las oficinas locales, particularmente aquellas donde el calor excesivo es menos frecuente o en áreas con desiertos o terreno montañoso, a menudo tienen sus propios criterios. Los valores altos del índice de calor se deben a que las temperaturas están significativamente por encima de lo normal y las humedades altas, y niveles tan altos pueden representar una amenaza para la vida humana a través de condiciones como insolación, agotamiento por calor y otras enfermedades relacionadas con el calor.​ (es)
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  • An excessive heat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least 105 °F (41 °C) for more than three hours per day for two consecutive days, or if the heat index is greater than 115 °F (46 °C) for any period of time. (en)
  • El Servicio Meteorológico Nacional de los Estados Unidos emite una advertencia de calor excesivo dentro de las 12 horas siguientes a que el índice de calor alcanza uno de los dos niveles de criterio. En la mayoría de las áreas, se emitirá una advertencia si hay un índice de calor de al menos 105 °F durante más de 3 horas al día durante 2 días consecutivos, o si el índice de calor es superior a 115 °F durante cualquier período de tiempo. (es)
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  • Advertencia de calor excesivo (es)
  • Excessive heat warning (en)
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