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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.
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 ...
PDS Special marine warnings are issued by the National Weather Service to inform mariners of weather conditions that present a considerable threat to life and property. On April 19, 2018, the Baltimore / Washington, D.C. forecast office upgraded a special marine warning to PDS status as a gust front approached Chesapeake Bay .
Maps show holiday weather forecast New York City woke up to its first white Christmas in 15 years. But only a few areas of the U.S. are likely to see snow in the weather forecast for Christmas 2024.
The rare alerts, urging people to seek higher ground, were issued for New York's Steuben County, as well as neighboring Allegany County, where 4 and 4.5 inches of rain had fallen by the afternoon.
Severe weather is one type of extreme weather, which includes unexpected, unusual, severe, or unseasonal weather and is by definition rare for that location or time of the year. [5] Due to the effects of climate change , the frequency and intensity of some of the extreme weather events are increasing, for example, heatwaves and droughts .
Maps show holiday weather forecast New York City woke up to its first white Christmas in 15 years. But only a few areas of the U.S. are likely to see snow in the weather forecast for Christmas 2024.
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