Doesn't need to be a traditional coastal. Sometimes those can work against you if you have warmer air aloft raising the DGZ if the storm track starts coming too close. Also very high winds are not helpful and knock down snow and prevent it from stacking up nice. A lot of these crazy 20-30:1 storms are usually light wind events not blizzards.
All you need is good lift inside the DGZ to produce high ratio stuff, doesnt have to be a coastal.
Strong H7 FGEN and super tall DGZ and boom you got some large dendrites coming down.
Conversely cold =/ high ratios, for example if a lot of the lift is occurring outside the dendritic growth zone.
Going more than 15:1 is so dangerous. We've seen many fluff bombs like Jan 7 2022 and Feb 7 2021 produce 15-25:1 but you're just asking for it when you start a forecast with those kind of insane ratios as an average across the entire storm.
But many of our positive busts come from underestimating ratios and we end up getting 20:1+ ...like Feb 11-12th, 2006.
Light wind also helps, strong winds can cut back ratios a bit.
I agree it could certainly end up that way especially if it keeps ticking N a bit and its just a front end punch to slot, but right now there's also a lot of potential for much higher numbers - we're still 4 days out from 18Z ish. I don't think i've ever seen you not be conservative to very conservative for every storm we've had and ive been on here for over 10 years. That's your thing, sometimes it works out.
Theres different stuff floating around but its been up to 72 hours for a while. BOXs criteria says 24-48+. Its usually within 24-48, but theyll go up to 72 if needed and based on where they are now, id bet its tomorrow pm.
72 hours. And in this case they are gonna use that because its higher than normal confidence.
Based on where the watches have expanded east and probs have gone up to 80% categorical in OKX. Tomorrow night. Almost guarantee theyll be out by tomorrow pm package.
That was a great positive bust over performer for N/NE MA. I was just looking at the forecast essex and they were going 6-10 in Essex i remember we had a map for most of SNE for 5-10 and Nrn Ma ended up with 12-19.
Kinda funny that storm doesnt get referred to often as one of those big ones, but it was a big dog for some.
It's way too early for exact calls and snowfall maps. But we put out a first assessment for the public for a general threat of 8"+ region wide - similar to the first one you did with that last storm that had 6"+/<6". I think thats reasonable atm.
GEFS is still lost lots of S members in there still, several hits and a couple really amped ones. So the mean appears roughly the same or maybe slight tick south
EPS much more uniform across the board.