Local brief
Flood Warning: St Mary's River at Macclenny — Nassau County, FL (Hurricane Isaias)
A National Weather Service Flood Warning is in effect in Nassau County, Florida, after Hurricane Isaias's rain: St Mary's River at Macclenny. Turn around, don't drown.
One river or areal Flood Warning covers part of Nassau County, Florida (NWS, as of 9:45 PM PT, Oct. 9, 2026). These are slower-rising floods than flash floods, but water can stay high for days.
NWS Jacksonville, Florida Flood Warning, updated 5:58 p.m. PT Oct. 9: St Mary's River at Macclenny. Minor flooding is occurring and minor flooding is forecast. When (NWS): Until further notice. At 5:45 p.m. PT Friday the stage was 12.4 feet. Forecast: The river is expected to rise to a crest of 12.7 feet tomorrow evening. Flood stage is 12.0 feet. Impacts (NWS): At 12.0 feet, Minor flooding of low lying areas and timber lands including some properties along St. Mary's River Bluff Road and the Cypress Landing Resort on the Georgia side. At 14.0 feet, Flooding of bottomlands along the river and some lower access roads including the lower half of St. Mary's River Bluff Road which cuts off 15 to 20 homes on the Georgia side. In effect until further notice. NWS product: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.bdf561fb983aa7ae18da67867610792583fc8c16.001.1
Safety, from NWS: "Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles." Move to higher ground if water is rising, never drive or walk into flood water, and be especially cautious at night when it is harder to recognize the dangers of flooding.
Hurricane Isaias, advisory by advisory from the National Hurricane Center: https://noticenearby.com/papers/tropical-storm-isaias-advisory-3-oct-7-2026
Source: National Weather Service Jacksonville, Florida Flood Warnings (FLW/FLS) via api.weather.gov; river forecasts: https://water.noaa.gov. Notice Nearby wrote this brief in its own words from NWS; times shown in Pacific time. More Nassau County notices: https://noticenearby.com/fl/nassau · Florida hub: https://noticenearby.com/fl
Source: the public notice on this register NN-ENV-fl-nassau-flood-warning-isaias-2026-10-09 · National Weather Service Jacksonville FL Flood Warnings.
This is a Notice Nearby local brief — an in-house explainer written from a government-posted notice on this register. It is not official minutes, not a newspaper story, and not Legal Publication.