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Flood Watch

Redondo Beach, WA

Day 1: 2024-12-07

CATEGORY 1

WHAT No flooding is expected. Conditions are normal with no significant flood risk.

WHEN Throughout the day on 2024-12-07.

IMPACTS No impacts expected related to flooding.

ADDITIONAL DETAILS...

Analysis:

Step 1: Assess Barometric Pressure

• The barometric pressure during the high tides on 2024-12-07 is high, with readings of 1023.58 hPa at 10:00 AM and 1022.26 hPa at 12:18 AM.
• This is significantly higher than pressures observed during historical flood events (e.g., Category 5 event at 978.4 hPa), indicating stable atmospheric conditions.

Step 2: Evaluate Tide Height

• The maximum tide height is approximately 20.078 ft at 10:00 AM.
• While higher than the Category 3 event (17.46 ft), high barometric pressure reduces the flood risk significantly.
• Significant flooding in the past occurred when high tide heights coincided with low barometric pressure.

Step 3: Consider Wind Direction and Speed

• Wind speeds are moderate, ranging from 10 to 15 km/h (6 to 9 mph), predominantly from the south-southwest (191° to 204°).
• No strong winds from the west/northwest that could elevate flood risks are present.

Step 4: Integrate NOAA High Tide Flooding Likelihood

• NOAA's forecast indicates a low flood likelihood of 1.3%, with a distance to the flood threshold of -1.08 m.
• This supports the assessment of a low flood risk.

Step 5: Synthesize Information and Forecast Flood Category

• Considering the high barometric pressure, moderate tide height, moderate wind conditions, and low NOAA flood likelihood, the flood risk is categorized as Category 1, indicating no risk of flooding.

Day 2: 2024-12-08

CATEGORY 1

WHAT No flooding is expected. Conditions are normal with no significant flood risk.

WHEN Throughout the day on 2024-12-08.

IMPACTS No impacts expected related to flooding.

ADDITIONAL DETAILS...

Analysis:

Step 1: Assess Barometric Pressure

• Barometric pressure remains high during high tides, with readings of 1025.60 hPa at 10:42 AM and 1024.87 hPa at 10:18 PM.
• These pressures are well above the thresholds associated with flooding in historical events.

Step 2: Evaluate Tide Height

• The maximum tide height is approximately 20.140 ft at 10:42 AM.
• Although this is higher than some historical lower-category events, the accompanying high barometric pressure reduces the flood risk.

Step 3: Consider Wind Direction and Speed

• Wind speeds are low to moderate, generally less than 22 km/h (14 mph), from varying directions.
• No significant wind patterns that could increase flood risk are observed.

Step 4: Integrate NOAA High Tide Flooding Likelihood

• NOAA's forecast indicates a low flood likelihood of 1.5%, with a distance to the flood threshold of -1.05 m.
• This suggests a minimal risk of flooding.

Step 5: Synthesize Information and Forecast Flood Category

• With high barometric pressure, moderate tide heights, low wind impact, and NOAA's low flood likelihood, the flood risk is categorized as Category 1.

Day 3: 2024-12-09

CATEGORY 1

WHAT No flooding is expected. Conditions are normal with no significant flood risk.

WHEN Throughout the day on 2024-12-09.

IMPACTS No impacts expected related to flooding.

ADDITIONAL DETAILS...

Analysis:

Step 1: Assess Barometric Pressure

• The barometric pressure at the time of the high tide on 2024-12-09 is 1023.03 hPa at 11:24 AM.
• This high pressure indicates stable atmospheric conditions, unlike the low pressures associated with historical flood events.

Step 2: Evaluate Tide Height

• The maximum tide height is approximately 20.228 ft at 11:24 AM.
• While this is relatively high, historical flooding occurred with tide heights over 21 ft combined with low barometric pressure.

Step 3: Consider Wind Direction and Speed

• Wind speeds are low to moderate, primarily under 15 km/h (9 mph), with no significant wind events expected.
• Wind directions are variable but do not align with patterns that have historically increased flood risk.

Step 4: Integrate NOAA High Tide Flooding Likelihood

• NOAA's forecast shows a low flood likelihood of 1.8%, with a distance to the flood threshold of -1.0 m.
• This aligns with a minimal risk of flooding.

Step 5: Synthesize Information and Forecast Flood Category

• Given the high barometric pressure, moderate tidal conditions, negligible wind impact, and low NOAA flood likelihood, the flood risk is categorized as Category 1.

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.