Be careful, the model may be counting some of the sleet as snow. Based on the latest HRRR. I just don't know how much is being counted. It will be close.
COOP's actually measure it just before the storm total stops accumulating or every 24 hours depending on the duration of the storm. That's the true rules of the COOP Weather Observers Guidelines.
That's the 3K but it's not rain per se but a serious downsloping situation in the valley. Seen this in many past storms. To the east and west ends up doing better.