# Snow day?

The National Weather Service’s Weather Prediction Center now has probabilistic winter precipitation guidance.  You can get maps showing

• the $n$th percentile of the predicted distribution of accumulation for $n = 5, 10, 25, 50, 75, 90, 95$;
• dually to that, contours on which the 10th, 20th, …, 90th percentile of the predicted distribution is a selected constant

for the next 72 hours, or for 24- or 48-hour subsets of that time period.  Here’s a more in-depth description.

Looks like the mid-Atlantic is in for a rough ride. Stay home. Have some French toast.  If you do go outside, ignore the wind chill.