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A high risk severe weather event is the greatest threat level issued by the
High Risk archive
{{DEFAULTSORT:Storm Prediction Center high risk days Lists of tornadoes in the United States National Weather Service Tornado-related lists Weather warnings and advisories
A high risk severe weather event is the greatest threat level issued by the Storm Prediction Center
The Storm Prediction Center (SPC) is a US government agency
A government or state agency, sometimes an appointed commission, is a permanent or semi-permanent organization in the machinery of government that is responsible for the oversight a ...
(SPC) for convective
Convection is single or multiphase fluid flow that occurs spontaneously due to the combined effects of material property heterogeneity and body forces on a fluid, most commonly density and gravity (see buoyancy). When the cause of the convect ...
weather events in the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
. On the scale from 1 to 5, a high risk is a level 5; thus, high risks are issued only when forecasters at the SPC are confident of a major severe weather outbreak. This is usually for major tornado outbreak
__NOTOC__
A tornado outbreak is the occurrence of multiple tornadoes spawned by the same synoptic scale weather system. The number of tornadoes required to qualify as an outbreak typically are at least six to ten, with at least two rotational l ...
s and occasionally derecho
A ''derecho'' (, from es, derecho, link=no , 'straight') is a widespread, long-lived, straight-line wind storm that is associated with a fast-moving group of severe thunderstorms known as a mesoscale convective system.
Derechos can cause hurri ...
s and are typically reserved for the most extreme events. They are generally only issued on the day of the event. However, only 2 occurrences (April 7, 2006, and April 14, 2012) of a day 2 high risk are known. A high risk cannot be issued on day 3.
High Risk Days
1982–1989
Thirty-four high risks were issued in the 1980s.1990–1999
Sixty high risks were issued in the 1990s.2000–2009
There were no high risk days in 2000.2010–2019
There were no high risk days in 2015, 2016, or 2018.2020–present
There were no high risk days in 2020 or 2022.See also
*List of deadliest Storm Prediction Center days by outlook risk level
The Storm Prediction Center issues daily outlooks denoting the risk for severe weather and wildfires for specific regions in the United States. For severe weather, which includes the risk for thunderstorms, tornadoes, hail, and straight-line winds, ...
* List of Storm Prediction Center extremely critical days
An extremely critical fire weather event is the greatest threat level issued by the National Weather Service, NWS Storm Prediction Center (SPC) for wildfire events in the United States. On the scale from one to three, an extremely critical is a le ...
* List of United States tornado emergencies
Since its first use in 1999, the National Weather Service (NWS) has used the Tornado Emergency bulletin, which is an enhanced form of a Tornado Warning used when a confirmed tornado poses a significant threat to life and property in a populated are ...
Notes
References
External links
High Risk archive
{{DEFAULTSORT:Storm Prediction Center high risk days Lists of tornadoes in the United States National Weather Service Tornado-related lists Weather warnings and advisories