Pat Shingleton: "Heat Plus Humidity Equals..."
Parishes north of Alexandria and counties north of McComb are struggling with a Heat Advisory. The criteria for the National Weather Service to designate this advisory include: a heat index greater than 108 degrees for at least two hours. Your heat index was designed and implemented by the U.S. Army to determine how a soldier's body would react in elevated temperatures and elevated humidity. Keeping within the context of heat, Death Valley National Park incorporates 5,000 square miles in California's Mojave Desert in the Sierra Nevada mountain range. The range includes 11,000 foot above sea level peaks. Badwater Basin is 28 feet below sea level. This area records an average rainfall of about two inches per year. Cooler, moisture-laden air from the Pacific rapidly dries and heats as it slides toward the valley floor, a process known as adiabatic warming. Weather observations in the area date back to 1861 and official record keeping began in 1911 when the U.S. Weather Bureau established a reporting station at Furnace Creek Ranch. On July 10, 1913 a maximum temperature of 134 degrees was recorded, remaining the hottest on record for the United States.
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