Issued within 12 hours of the onset of the following conditions: heat index of at least 105°F but less than 115°F for less than 3 hours per day, or nighttime lows above 80°F for 2 consecutive days.

Issued when the Heat Index is expected to exceed 105 during the day and 80 during the night for at least two consecutive days. HEAT INDEX: Also known as the Apparent temperature, it is a non-physical [..]

This product is issued by the National Weather Service when excessive heat may pose a hazard or is life threatening if action is not taken. The criteria for this advisory varies from state to state.

A bulletin issued by NWS within 12 hours of the onset of the following conditions: Heat Index is, or is expected to reach, 105oF, but less than 115oF, for less than 3 hours per day. Nightime lows remain above 80oF for 2 consecutive days. An

Issued within 12 hours of the onset of the following conditions: heat index of at least 105°F but less than 115°F for less than 3 hours per day, or nighttime lows above 80°F for 2 consecutive days.

A heat advisory is issued when the heat index is expected to exceed 105 °F (100 °F in New York City) or if nighttime lows are expected to be greater than 80 °F for two or more nights.

Issued when the "heat index" is expected to exceed 105 degrees during the day and 80 degrees during the night for at least two consecutive days.

Issued within 12 hours of the onset of the following conditions: heat index of at least 105 degrees but less than 115 degrees for less than 3 hours per day. Nighttime lows remain above 80 degrees for [..]

Issued within 12 hours of the onset of the following conditions: heat index

Issued within 12 hours of the onset of the following conditions: heat index of at least 105?Ǭ?F but less than 115?Ǭ?F for less than 3 hours per day, or nighttime lows above 80?Ǭ?F for 2 consecutive [..]