NWS Paducah Hazardous Weather Support Center

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Safety and Preparedness
Heat Safety and Preparedness (NOAA) Heat Wave: A Major Summer Killer (NOAA) Summer Heat: The Silent Killer (WFO Paducah) NOAA Weather Radio WFO Paducah Education Page Weather-Ready Nation

Criteria for Extreme Heat Products Issued by WFO Paducah
Heat Advisory - Issued when daytime heat indices are forecast near or in excess of 105°F for any duration. A Heat Advisory may also be considered if sub-advisory criteria (100-105°) are forecast to persist for at least four consecutive days.
Excessive Heat Warning - Issued when daytime heat indices are forecast near or in excess of 110°F for two consecutive days, with nighttime lows of at least 75°F. An Excessive Heat Warning may also be considered if Heat Advisory criteria are forecast to persist for at least four consecutive days. An Excessive Heat Watch may also be issued in advance of a warning if conditions are favorable for an excessive heat event in the next 24 to 72 hours.

Heat Index Chart



Heat Index 90°-105°	Sunstroke, heat cramps, and heat exhaustion possible with prolonged physical activity
Heat Index 105°-130°	Sunstroke, heat cramps, or heat exhaustion likely, and heatstroke possible with prolonged exposure and/or physical activity
Heat Index 130° and higher	Heatstroke and/or sunstroke highly likely with continued exposure
IMPORTANT: Since heat index values were devised for shady, light wind conditions, exposure to full sunshine can increase heat index values by up to 15°F. The combination of strong winds with very hot, dry air can also be extremely dangerous.

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