NAM normally sniffs out the thermals, which in this case brings sleet. Just weird that it’s only showing up now. Normally we start seeing that sleet line at at least 24 hours in advance. Nws just responded back to me, warning criteria is 6” in Lehigh county. The forecasted amount is 5.5”. That’s why they stayed with an advisory. Winter storm warning here at home for 8-12” .