Key Facts
- Report Source
- NOAA National Ocean Service
- Publication Date
- August 22, 2023
- Flooding Trend
- Record-breaking high tide flooding
- Flooding Threshold
- 1.75 to 2 feet above daily average high tide
- Frequency Increase
- Doubled in past 30 years
Background
The National Oceanic and Atmospheric Administration (NOAA) has released its annual high tide flooding report, indicating that the United States continues to experience record-breaking high tide flooding. The report, published on August 22, 2023, highlights the ongoing trend of increased flooding in coastal areas.
High tide flooding, also known as nuisance flooding, occurs when tides reach 1.75 to 2 feet above the daily average high tide, causing flooding in streets, yards, and other low-lying areas. This type of flooding has become more frequent due to rising sea levels, which are driven by climate change and the thermal expansion of the ocean.
Current Situation
According to NOAA, the U.S. experienced a record number of high tide flood days in the past year. The report notes that the trend of increasing flood days is expected to continue, with many coastal communities already feeling the impacts. The data shows that the frequency of high tide flooding has doubled in the past 30 years.
NOAA's report emphasizes that the flooding is not just a coastal issue but also affects inland communities through storm surge and sea level rise. The agency warns that without significant action to reduce greenhouse gas emissions and adapt to rising seas, the problem will worsen.
| Metric | Value |
|---|---|
| Flooding threshold | 1.75-2 feet above average high tide |
| Frequency increase | Doubled in 30 years |
| Projected increase by 2050 | Could triple |
Impacts
The increased high tide flooding has significant impacts on coastal communities, including damage to infrastructure, disruption of daily activities, and economic losses. Businesses, residents, and local governments are all affected, with repeated flooding leading to costly repairs and reduced property values.
The report also highlights the strain on emergency services and the need for improved flood management strategies. Communities are being urged to invest in resilient infrastructure and to plan for future sea level rise.
Future Outlook
Scenario analysis: The possibilities below are not certain predictions.
Looking ahead, NOAA projects that high tide flooding will continue to increase in frequency and severity. If sea levels continue to rise at current rates, the number of flood days could triple by 2050. This would have profound implications for coastal communities, requiring significant adaptation efforts.
However, if global action to reduce emissions is successful and sea level rise is slowed, the increase in flooding could be less severe. The report emphasizes that the future is not predetermined and that proactive measures can mitigate the worst impacts.
Source: NOAA National Ocean Service
