I’m not a Met and I don’t play one on TV, however; if we’ve got a chance at sleet, petty good bet that we don’t have 20:1 ratios. We thought this would be suppressed to the south originally, but even with that, we’d get .5 of QPF, which would mean 5-8 inches. Remember, there’s a snowstorm next week after this too.
Now we’ve got the chance that maybe either the high pressure isn’t as strong as originally thought, or the low pressure is coming closer to the coast… which will warm the air. Warmer air = lower ratios.