Here's the sounding from the GFS for his area (roughly), that's actually decent temps for the dendritic growth zone but the winds at height probably argue against really good ratios.
Precipitation rates also come into play here as you'd need something heavier (like the NAM shows) to get proper dynamic cooling. Light rates with a surface temperature of just about freezing won't do much.
A general rule that would serve people well is that for coastal areas the ratios don't usually exceed the standard 10-1. There any obviously plenty of exceptions but more often than not it's best to ignore ratios for the coastal plain.