to move in

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The model grid point used on this site is Wings Field, Blue Bell Montgomery County PA. (KLOM)

So when a time is given for precipitation “to move in”, it’s referring to when the precipitation reaches Blue Bell.

Since many precipitation events move generally west to east and sometimes south to north, areas elsewhere may see precip as much as an hour earlier.

Immediate areas in NJ may see precip about 1 hour later.

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