Like a buzz saw razing the ground, tornadoes brought total destruction and killed 40 people.
A neighborhood in Moore, Okla., lies in ruin on May 4, 1999, after a tornado slammed into central Oklahoma. By Matthew Cappucci May 3 at 1:56 PM May 3, 1999, started like so many other days in Oklahoma. Temperatures hovered in the mid-60s, low clouds and fog hung in the air, and a stiff southerly breeze continued to drag in moisture from the Gulf of Mexico.
As the morning wore on, the cloud deck began to dissipate, allowing sunlight to penetrate. That heating from below encourages air near the ground to rise as an unstable column of air, tipping the scales as a plume of moisture bubbles up. It’s a similar premise that allows pockets of fluid to ascend in a lava lamp. Recognizing the concern, the Storm Prediction Center upped the severe weather risk to “moderate,” highlighting the potential for “a few strong or violent tornadic supercells.
Things ramped up fast. The first tornado warning in southwestern Oklahoma was issued at 4:47 p.m. At 4:51 p.m., the National Weather Service in Norman received its first tornado report. On their website, forecasters wrote that “just beyond the 5 o’clock hour, it became obvious that a significant outbreak was unfolding.” One thing soon became clear: This was a worst-case scenario setup, as a barrage of supercell thunderstorms raced toward the Oklahoma City metro area.
The storms reached a height of several miles above the Oklahoma City region. Forecasters at the National Weather Service in nearby Norman knew this was a life-or-death situation, and their 6:57 p.m. message reflected it. The warning began “tornado emergency in south Oklahoma City,” the phrase “tornado emergency” never having been used before.
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