National Weather Service United States Department of Commerce

Barry Fading Away; Attention Turns To Major Summer Heat Wave

Post-Tropical Barry continues to steadily weaken and will fade away over the next day or two. The decaying system may still produce very heavy rainfall and possible flash flooding from the Lower Mississippi Valley to the Ohio Valley. Attention on the weather then shifts from Barry to a major summer heat wave mid to late week into the weekend, across much of the Central and Eastern states. Read More >

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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.
 
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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.