Flood Watch

Redondo Beach, WA

Day 1: 2024-09-03

CATEGORY 2

WHAT Minor coastal flooding expected. Possible inundation of up to 1 foot above ground level near shorelines and low-lying areas.

*WHEN From 04:00 AM to 06:00 AM PST and from 05:00 PM to 07:00 PM PST.

IMPACTS Minor flooding of low-lying areas, parks, and roads. Isolated road closures possible.

ADDITIONAL DETAILS...

The high tide at 04:24 AM on 2024-09-03 is expected to reach a height of approximately 17.199 feet with a mean pressure MSL of 1004.42 hPa. The high tide at 05:36 PM on the same day is expected to reach a height of approximately 18.887 feet with a mean pressure MSL of 1001.49 hPa. These conditions are similar to the Category 3 event on 12/27/2023 but with slightly higher barometric pressure, reducing the likelihood of severe flooding. Wind speeds are moderate, and the wind direction is not significantly contributing to increased flood risk.

Day 2: 2024-09-04

CATEGORY 2

WHAT Minor coastal flooding expected. Possible inundation of up to 1 foot above ground level near shorelines and low-lying areas.

WHEN From 05:00 AM to 07:00 AM PST and from 05:00 PM to 07:00 PM PST.

IMPACTS Minor flooding of low-lying areas, parks, and roads. Isolated road closures possible.

ADDITIONAL DETAILS...

The high tide at 05:06 AM on 2024-09-04 is expected to reach a height of approximately 17.585 feet with a mean pressure MSL of 1000.33 hPa. The high tide at 05:54 PM on the same day is expected to reach a height of approximately 18.868 feet with a mean pressure MSL of 1008.68 hPa. The barometric pressure is higher than in historical severe flood events, suggesting less severe weather conditions and a lower likelihood of an extreme flooding event.

Day 3: 2024-09-05

CATEGORY 2

WHAT Minor coastal flooding expected. Possible inundation of up to 1 foot above ground level near shorelines and low-lying areas.

WHEN From 05:30 AM to 07:30 AM PST and from 05:30 PM to 07:30 PM PST.

IMPACTS Minor flooding of low-lying areas, parks, and roads. Isolated road closures possible.

ADDITIONAL DETAILS...

The high tide at 05:48 AM on 2024-09-05 is expected to reach a height of approximately 17.555 feet with a mean pressure MSL of 1007.84 hPa. The high tide at 06:12 PM on the same day is expected to reach a height of approximately 18.828 feet with a mean pressure MSL of 1007.84 hPa. These conditions are similar to the Category 3 event on 12/27/2023 but with higher barometric pressure, reducing the likelihood of severe flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.


Forecast Reasoning:

Step-by-step analysis was conducted based on provided data:

  1. Assess Barometric Pressure:
  2. Day 1 (17:36): Pressure = ~1001.49 hPa
  3. Day 2 (17:54): Pressure = ~1008.68 hPa
  4. Day 3 (18:12): Pressure = ~1007.84 hPa
  5. All pressures are significantly higher than the critical threshold (992.8 hPa), indicating less severe weather conditions.

  6. Evaluate Tide Height:

  7. Day 1 (17:36): Tide = ~18.887 ft
  8. Day 2 (17:54): Tide = ~18.868 ft
  9. Day 3 (18:12): Tide = ~18.828 ft
  10. These heights are below the critical threshold for severe flooding (>21 ft).

  11. Consider Wind Direction:

  12. Wind directions are not significantly contributing to increased flood risk based on historical data comparisons.

  13. Integrate NOAA High Tide Flooding Likelihood:

  14. NOAA's flood likelihood for Seattle, WA indicates low risk for all three days with likelihood percentages at or near zero.

  15. Synthesize Information and Forecast Flood Category:

  16. Given the high barometric pressures, moderate tide heights, and NOAA's low flood likelihood scores, the forecasted flood category for all three days is Category 2, indicating minor coastal flooding with minimal impact.

This analysis provides a comprehensive assessment based on available data while emphasizing safety and preparedness actions for residents in flood-prone areas.