City vs city
Marietta-Alderwood vs Sudden Valley, WA
Sudden Valley currently scores 9 points higher overall than Marietta-Alderwood, with the largest gap in wildfire.
Use this comparison for relocation decisions, insurance shopping, and hazard-prioritized mitigation planning.
Hazard breakdown
Scores describe each city’s reference grid tile, not every property. A missing model is unavailable, not zero risk. Air quality uses an ingested EPA AirNow snapshot and may not reflect current conditions; other factors describe baseline exposure. The overall score blends different hazards and is not a probability of damage. Read the scoring methodology and sources.
Overall
Marietta-Alderwood: 13/100 · Sudden Valley: 22/100
Sudden Valley is 9 points higher.
Flood
Marietta-Alderwood: 30/100 · Sudden Valley: 36/100
Sudden Valley is 6 points higher.
Marietta-Alderwood: FEMA NFHL flood zones: 8 features intersect this tile.
Sudden Valley: FEMA NFHL flood zones: 6 features intersect this tile.
Wind
Marietta-Alderwood: 7/100 · Sudden Valley: 7/100
No gap.
Marietta-Alderwood: Wind exposure derived from ingested design wind / climatology tiles.
Sudden Valley: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Marietta-Alderwood: 1/100 · Sudden Valley: 1/100
No gap.
Marietta-Alderwood: Lightning exposure derived from ingested climatology tiles.
Sudden Valley: Lightning exposure derived from ingested climatology tiles.
Tornado
Marietta-Alderwood: 0/100 · Sudden Valley: 0/100
No gap.
Marietta-Alderwood: Tornado risk derived from NOAA SPC historical reports.
Sudden Valley: Tornado risk derived from NOAA SPC historical reports.
Hail
Marietta-Alderwood: 0/100 · Sudden Valley: 0/100
No gap.
Marietta-Alderwood: Hail risk derived from NOAA SPC historical reports.
Sudden Valley: Hail risk derived from NOAA SPC historical reports.
Storm surge
Marietta-Alderwood: Unavailable · Sudden Valley: Unavailable
A score difference cannot be calculated without both sources.
Marietta-Alderwood: Storm surge model is not available for this location yet.
Sudden Valley: Storm surge model is not available for this location yet.
Wildfire
Marietta-Alderwood: 11/100 · Sudden Valley: 51/100
Sudden Valley is 40 points higher.
Marietta-Alderwood: Wildfire exposure derived from ingested fire potential tiles.
Sudden Valley: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Marietta-Alderwood: 16/100 · Sudden Valley: 16/100
No gap.
Marietta-Alderwood: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Sudden Valley: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.