A record 9 inches of rain fell in 24 hours in St. Louis, breaking the previous record.
More than 10 inches of rain fell in eastern Kentucky, causing rivers to rise and washing away homes near the shores.
There was 10-13 inches of rain in just hours in southeastern Illinois as August began. The Death Valley had a year's worth of rain in three hours, swamping the region with flooding that shut down every road inside the national park.
The Dallas-Fort Worth Metroplex was flooded as 3 inches of rain fell in an hour, part of a series of storms that dropped more than 9 inches at the Dallas-Fort Worth International Airport in 24 hours.
Some parts of Mississippi received more than 8 inches of rain in three hours. Dozens of rescues were needed due to the flooding.
There are 7 facts you should know about flash floods.
All six events reached the local threshold to be classified by the National Weather Service as a 1-in-1,000-year rain event. Last year, deadly flooding that struck New York City and New Jersey from the remnants of Hurricane Ida and catastrophic flooding in west-central Tennessee qualified as extremely rare 1-in-1,000-year rainfall events.
You'd expect to be in the clear until the year 3022 if you experience a 1-in-1,000-year rainfall event.
It isn't how it works. The term is given to an event that has a 1% chance of happening in a year. A 1% chance is considered a "1-in-100-year" event, while a 1% chance is considered a "1-in 500-year" event.
The city of St. is located in the northeastern part of the United States There were two different 1-in-1,000-year rain events in the same week.
The Office of Water Prediction is tasked with researching historical rainfall events across the nation to classify how much rain needs to fall within certain times. It took less rain in Death Valley than it did in St. Louis.
You might be wondering if the calculations are off with so many rare events happening with more regularity.
Climate change is increasing heavy precipitation events in the U.S.
Increased water Vapor and Increased Evaporation can be achieved by warmer ocean temperatures. Warm air holds more water vapor. According to the USGCRP, storms will have more access to water when there is more precipitation.
There is a way to watch the weather on television.
Nine of the top 10 years for extreme one-day precipitation between 1910 and 2020 have taken place since 1996. Between 1910 and the 1980s, the prevalence of extreme single-day precipitation events was fairly constant, but has risen substantially since then.
The Office of Water Prediction's Hydrometeorological Design Studies Center has been researching and updating the precipitation thresholds across the nation for many years and has created interactive maps to allow users to calculate the estimated precipitation amounts in their area. In the Northwest, research is still underway to determine those thresholds.
The National Weather Service issues flood warnings.
The maps will likely be updated in the future.
The recently enacted infrastructure law provides funding for the National Oceanographic and Atmospheric Administration to further analyze any changes and trends in observed rainfall events due to climate change. The research is in progress.
One-in-1,000-year rain events are not the same as one-in-1,000-year flood events according to the National Oceanographic and Atmospheric Administration.
A 1,000-year flood event may not have been triggered by a 1,000-year rain event if there was an extreme rainfall event that hit that criteria. The terms should not be used in a way that's similar.
The United States Geological Survey is in charge of determining probabilities when it comes to flooding, while the National Oceanographic and Atmospheric Administration is in charge of determining extreme precipitation probabilities.
All Rights Reserved © 2024
