Dangerous Heat in the Central and Eastern U.S.; Critical Fire Weather in the Great Basin and Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue Tuesday across portions of the Four Corners and Great Basin, as dry conditions and gusty winds persist. 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.

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Dangerous Heat in the Central and Eastern U.S.; Critical Fire Weather in the Great Basin and Southwest

NWS Paducah Hazardous Weather Support Center