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Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
Weather patterns can experience some variation, and so extreme weather can be attributed, at least in part, to the natural climate variability that exists on Earth. For example, the El Niño-Southern Oscillation (ENSO) or the North Atlantic Oscillation (NAO) are climate phenomena that impact weather patterns worldwide. [4]
A Short-Term Forecast NOW (alt., NOWcast) is an event-driven narrative outlook of near-term weather conditions within the Weather Forecast Office’s area of responsibility, typically valid for a three- to seven-hour period. The product outlines any ongoing or recently occurring conditions—based on radar analysis, satellite imagery and other ...
The Leonid meteor shower is a result of the Earth passing through the debris cloud of the comet Tempel-Tuttle. The display gets its name from the constellation Leo, from which the shooting stars ...
Some may be bracing for bad weather that could lead to travel headaches, though everyone is certainly hoping to avoid a catastrophe like last year's Southwest Airlines meltdown in which 17,000 ...
Blowing snow could prompt power outages and snarl travel across a swath of the nation's northern tier, and it's so cold in the South that iguanas could start falling from trees in Florida as waves ...
Another form of severe weather is drought, which is a prolonged period of persistently dry weather (that is, absence of precipitation). [92] Although droughts do not develop or progress as quickly as other forms of severe weather, [93] their effects can be just as deadly; in fact, droughts are classified and measured based upon these effects. [92]
Parts of Texas and Louisiana were under a tornado watch Thursday night as a line of thunderstorms battered the south-central U.S., threatening the region with large hail, damaging winds and heavy ...