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A high risk severe weather event is the greatest threat level issued by the Storm Prediction Center (SPC) for convective weather events in the United States. On the scale from one to five, a high risk is a level five; thus, high risks are issued only when forecasters at the SPC are confident of a major severe weather outbreak.
A 2021 map shows the impact of a tsunami hitting the San Fransisco area - and the devastation it could cause. The map was thrust back into the spotlight Thursday when a 7.0-magnitude earthquake ...
The geological record of the region indicates on average, these mega earthquake and tsunami events happen every 500 years. This part of the US is at highest risk for a devastating tsunami Skip to ...
The California Geological Survey releases tsunami hazard maps for Ventura, San Diego, Marin, Napa, Santa Cruz, Solano and Sonoma counties to help residents understand risks.
The categorical forecast in the Day 1-3 Convective Outlooks—which estimates a severe weather event occurring within 25 miles (40 km) of a point and derives the attendant risk areas from probability forecasts of tornadoes, damaging winds, and large hail on Days 1 and 2, and a combined severe weather risk on Day 3—specifies the level of ...
The Storm Prediction Center is responsible for forecasting the risk of severe weather caused by severe thunderstorms, specifically those producing tornadoes, hail of one inch (2.5 cm) in diameter or larger, and/or winds of 58 miles per hour (93 km/h) [50 knots] or greater. The agency also forecasts hazardous winter and fire weather conditions.
PDS Tornado Watches are often issued on high risk days for severe weather, though have been issued on high-end moderate risk days. [17] The PDS tornado watch shown below was issued on April 27 during the tornado outbreak sequence of April 25–28, 2024. [18]
A TORCON level of 2 would mean a 20% risk of a tornado, TORCON 5 would be 50%, and so on. In this video from The Weather Channel , Forbes explains the TORCON system and how it's used.