NWS JAX is forecasting 6-12 inches as well.
Area Forecast Discussion
National Weather Service Jacksonville FL
905 AM EDT Mon Sep 26 2022
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.HYDROLOGY...
Issued at 253 AM EDT Mon Sep 26 2022
Models are in general agreement with rainfall totals of 6-12
inches through the end of the week with Ian, with highest amounts
across coastal NE FL where strong low level convergent bands will
form, and another maximum expected closer to the eventual track of
Ian after it comes onshore and tracks through the Suwannee Valley
and into inland SE GA. Localized higher amounts can be expected
and other than the usual flash flooding threat on Wed/Thu/Fri,
expect significant river rises and main focus will be on most NE
FL basins, since they remain higher from heavy rainfall over the
past 2 months, with the Santa Fe still in Action/Elevated stages
at the moment, although the expected rainfall amounts will likely
bring potential for flooding on Black Creek, St Mary`s and
Suwannee Basins as well. A combination of trapped high tides and
fresh water flooding is also expected on the St Johns River and in
addition to likely Flood Watches from Wed through Fri, the St
Johns River Basin will likely need Coastal Flood Watches as well
