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Storm Prediction Center: Difference between revisions
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{{Short description|American severe weather forecasting center}} | {{Short description|American severe weather forecasting center}} | ||
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A '''high risk''' day indicates a considerable likelihood of significant to extreme severe weather, generally a major tornado outbreak or (much less often) an extreme [[derecho]] event. On these days, the potential exists for extremely severe and life-threatening weather. This includes widespread strong or violent tornadoes which may be on the ground for a half-hour or longer, or very destructive straight-line winds. Hail cannot verify or produce a high risk on its own, although such a day usually involves a threat for widespread very large and damaging hail as well. Many of the most prolific severe weather days were high risk days. Such days are rare; a high risk is typically issued (at the most) only a few times each year (see [[List of Storm Prediction Center high risk days]]). High risk areas are usually surrounded by a larger moderate risk area, where uncertainty is greater or the threat is somewhat lower.<ref name="convective outlooks"/> | A '''high risk''' day indicates a considerable likelihood of significant to extreme severe weather, generally a major tornado outbreak or (much less often) an extreme [[derecho]] event. On these days, the potential exists for extremely severe and life-threatening weather. This includes widespread strong or violent tornadoes which may be on the ground for a half-hour or longer, or very destructive straight-line winds. Hail cannot verify or produce a high risk on its own, although such a day usually involves a threat for widespread very large and damaging hail as well. Many of the most prolific severe weather days were high risk days. Such days are rare; a high risk is typically issued (at the most) only a few times each year (see [[List of Storm Prediction Center high risk days]]). High risk areas are usually surrounded by a larger moderate risk area, where uncertainty is greater or the threat is somewhat lower.<ref name="convective outlooks"/> | ||
The Storm Prediction Center began asking for public comment on proposed categorical additions to the Day 1-3 Convective Outlooks on April 21, 2014, for a two-month period.<ref>{{cite web|title=Experimental SPC Day 1, 2, 3 Convective Outlook Change Public Comment Page|url=http://www.spc.noaa.gov/exper/dy1-3example/|website=Storm Prediction Center|publisher=National Oceanic and Atmospheric Administration|access-date=April 21, 2014}}</ref> The Storm Prediction Center broadened this system beginning on October 22, 2014 by adding two new risk categories to the three used originally. The new categories that were added are a "marginal risk" (replacing the "SEE TEXT" contours, see below) and an "enhanced risk". The latter is used to delineate areas where severe weather will occur that would fall under the previous probability criteria of an upper-end slight risk, but do not warrant the issuance of a moderate risk. In order from least to greatest threat, these categories are ranked as: marginal, slight, enhanced, moderate, and high.<ref>{{cite news|title=Forecasters Adding New Layers of Storm Outlooks|url=https://abcnews.go.com/m/story?id=21567394&sid=81|agency= | The Storm Prediction Center began asking for public comment on proposed categorical additions to the Day 1-3 Convective Outlooks on April 21, 2014, for a two-month period.<ref>{{cite web|title=Experimental SPC Day 1, 2, 3 Convective Outlook Change Public Comment Page|url=http://www.spc.noaa.gov/exper/dy1-3example/|website=Storm Prediction Center|publisher=National Oceanic and Atmospheric Administration|access-date=April 21, 2014}}</ref> The Storm Prediction Center broadened this system beginning on October 22, 2014 by adding two new risk categories to the three used originally. The new categories that were added are a "marginal risk" (replacing the "SEE TEXT" contours, see below) and an "enhanced risk". The latter is used to delineate areas where severe weather will occur that would fall under the previous probability criteria of an upper-end slight risk, but do not warrant the issuance of a moderate risk. In order from least to greatest threat, these categories are ranked as: marginal, slight, enhanced, moderate, and high.<ref>{{cite news|title=Forecasters Adding New Layers of Storm Outlooks|url=https://abcnews.go.com/m/story?id=21567394&sid=81|agency=Associated Press|website=[[ABC News (United States)|ABC News]]|publisher=[[The Walt Disney Company]]|date=January 17, 2014}}</ref><ref>{{cite news|title=Forecasters adding layers of storm outlooks|url=http://www.arkansasonline.com/news/2014/jan/17/forecasters-adding-new-layers-storm-warnings/|agency=Associated Press|newspaper=[[Arkansas Democrat-Gazette]]|date=January 17, 2014}}</ref><ref>{{cite news|title=A better outlook: SPC revises its severe categories|url=http://www.wusa9.com/story/weather/2014/03/27/spc-severe-thunderstorms-tornadoes-hail/6974379/|website=[[WUSA (TV)|WUSA]]|publisher=[[Gannett Company]]|date=March 28, 2014|access-date=March 30, 2014|archive-date=April 26, 2014|archive-url=https://web.archive.org/web/20140426215509/http://www.wusa9.com/story/weather/2014/03/27/spc-severe-thunderstorms-tornadoes-hail/6974379/|url-status=dead}}</ref> | ||
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[[Category:1995 establishments in Oklahoma]] | [[Category:1995 establishments in Oklahoma]] | ||
[[Category:Climate change organizations]] | [[Category:Climate change organizations]] | ||
[[Category:Weather organizations]] | |||