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Hi Howard:you are just seeing a warning that you havent set the "data type" metadata. most things still work, but there are a few things that wont work without it.
try changing
<dataset name="Irene Aggregated" ID="IreneAggregated" urlPath="IreneAggregated.nc">
to:<dataset name="Irene Aggregated" ID="IreneAggregated" urlPath="IreneAggregated.nc" dataType="GRID">
thredds
archives: