Holy City Live · Charleston flood & heat risk

Checking tides and rain…

Standing water Closed for flooding Closed, other reason

Closed streets Heat Satellite

Comfortable

Dangerous

Basemap © Esri, HERE, Garmin, OpenStreetMap contributors. Elevation: USGS 3DEP.

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Past 2 days to next 7

Harbor water level

Charleston Harbor gauge, NOAA 8665530

… ft MLLW

━ observed ┅ NWS forecast ┅ STOFS ━ astronomical ▮ rain

More layers

Tidal + surge flood (bathtub) Rain ponding (radar + forecast, compound with tide) FEMA flood zones (NFHL) Stormwater inlets & pipes Tree canopy (City)

What if

NOAA 2022 sea level rise

Year

Storm surge: +0.0 ft

Rain model calibration

Drainage + infiltration: 1.00 in/h

Runoff concentration into low spots: 4×

Drainage drops to zero as the harbor rises from MHHW to minor flood stage (outfalls submerged). Defaults fit the 15 City flood closures of Oct 4, 2026 (12 of 15 reproduced). That's one event, so treat them as a starting point.

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Vertical exaggeration: 12×

Weather and air

… US AQI

Weather alerts

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This spot in detail

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Legend

Water on normally dry land, by depth (tide or rain)

0 in1 ft+

Heat index (°F, NWS categories; no tint below 80)

768090103125

■ FEMA 1% annual chance (AE/VE) ■ 0.2%

━ storm pipe • storm inlet ■ tree canopy

━ closed for flooding ━ closed, other reason

Data sources

Loading street elevations (~10 s)…