Submitted by TheCloudBoy t3_11qev87 in newhampshire

This is my final forecast for snow totals ahead of Tuesday's nor'easter set to bombard most of the Northeast U.S. Because I enjoy taking on seemingly ludicrous challenges, I've included best-guess snowfall totals for select locations on this map. There are several important updates, here's what you should know:

  1. A powerful winter storm is imminent for the Granite State Tuesday AM through Wednesday AM. This cyclone will undergo explosive deepening (bombogenesis) during it's closest "wobble" to us. Please don't call this a "bomb cyclone"; be smarter than the lemmings hurting for ratings on the national TV outlets.
  2. Significant snow accumulations are imminent along this storm's deformation axis across the Monadnock Region, upper Merrimack Valley, & eastern Lakes Region. 16-24" amounts are likely above 1,500 feet in the Monadnock Region, with isolated 24"+ on Mt. Monadnock & Pack Monadnock. I've extended the 12-16" band through Hooksett & Bow, additional increases through Manchester, Bedford, & Auburn are also possible.
  3. A brief window of damaging wind gusts (50-65 MPH) are now expected between 1-6 PM Tuesday, which will be at the leading edge of a bent-back warm front as the warm core seclusion develops. These gusts will occur in/east Raymond, but may reach Concord/Manchester/Nashua if the low wobbles further west.
  4. The weight of the snow will become increasingly heavy & sticky (low snow ratios of 5.5-9:1) in/southeast of Manchester, where temperatures are marginal for most of this event. Power outages are possible from the combo of strong winds & wet snow here; use caution if shoveling.



You must log in or register to comment.

plz1 t1_jc2tch8 wrote

Any update on when/if we can get higher-contrast coloring on these? I love the accuracy of the previous ones, but the pastel color scheme is hard for some.


r-a-f t1_jc3dvx6 wrote

Is this helpful? Just using the Photoshop color-replace tool, so not perfect…


plz1 t1_jc3edq9 wrote

Much easier, thank you.


invenio78 t1_jc4v5s4 wrote

Thanks. Much better. Couldn't tell the 4-8 and 8-12 bands with the original.


Quirky_Butterfly_946 t1_jc39a8j wrote

I see this with TV weather maps. They all need to make it more clear especially when one is looking at the boundary areas.


TheCloudBoy OP t1_jc3gnms wrote

This has been a challenge, especially given I was using a more detailed color wheel and attempted to hop between shades at a decent clip to help color blind folks. My only hiccup with using WMUR's color table is I don't want to be associated in *any way* with their products, otherwise I'd be working for them. I may implement a similar shade scheme like theirs, but modify it heavily.


Fly4aPhish t1_jc435ld wrote

Thank you we appreciate it. The 4-8 and the 8-12 still look identical to me.


perfectbebop t1_jc3m7xr wrote

No clue if it’d be a good idea considering the size of the map, but could you add pattern to the color bands as a secondary identifier? Is common in board/card games as an adaptive measure for increased accessibility


Tony3696 t1_jc2yil4 wrote

Looks good - I say leave it as-is


twosunsyzygy t1_jc34q92 wrote

Some people have colorblindness that makes reading the map difficult to discern.


Killbro_Fraggins t1_jc2sdpi wrote

Thanks for your hard work Papa Cloud. Glad I ended up rescheduling. Good luck everyone! Stay warm and safe!


ItsMeFergie t1_jc323dw wrote

I honestly check this before storms for work. Was just planning whether or schedule installs and send the boys out. You’re the most accurate. Thank you for your service 🫡


ItsMeFergie t1_jc32jpn wrote

To follow up - I will not be sending the guys out tomorrow


Ayit_Sevi t1_jc2ufy9 wrote

Thanks for this, so it seems like the snow will start off light and be wet/heavy towards the end?

Also, can you ELI5 the snow ratio thing, is this a snow to rain mixture?

>(low snow ratios of 5.5-9:1)


benduker7 t1_jc2z19a wrote

I was curious as well, and found this link which gives a great explanation.

TL;DR: This is the snow to water ratio. So 5.5:1 means if you took 5.5 inches of snow and melted it, you would get 1 inch of water. "Light and fluffy" snow might be 15:1 or 20:1, whereas very heavy snow would be 10:1 or below.


TheCloudBoy OP t1_jc2zh0f wrote

Yep, that's exactly how I would have explained it! Wet bulb temperature is another important factor when considering how sticky it is to trees, power lines, etc.


Ayit_Sevi t1_jc2zxn6 wrote

Thanks for this. You learn something new every day


figment1979 t1_jc336nx wrote

Just curious, does "bomb cyclone" actually exist, and if yes, how is it different than this one? I want to sound like I've got inside knowledge. :)


TheCloudBoy OP t1_jc370w8 wrote

Good question! Bomb cyclone is one of those scary characterizations designed by and gobbled up by national media around an actual classification in meteorology. When a cyclone experiences a 24+ mb pressure drop in 24 hours, that's classified as bombogenesis, or explosive deepening.


aristomephisto t1_jc2vh02 wrote

I always think it's crazy that the White Mountains have usually been getting the least amount of snowfall/accumulation. I wonder if it's climate change or the topography. I live here and get pissed off when southern NH and Boston get more snow than us.


tadamhicks t1_jc2wsns wrote

Not the whites proper, but just south of Conway and we’ve been hammered.

The Whites seem like they’ve done great in the last few storms.


aristomephisto t1_jc2x0gp wrote

I'm in the Littleton area and we barely got anything, the schools haven't even really had snow days.


tadamhicks t1_jc2yc8l wrote

Yeah I’ve noticed that the other side hasn’t had much, but this side has been rowdy. Skiing at valley areas was pretty dang good for a bit. Looks like we’re in the 8-12 range for tomorrow, too.


Berzerk_Unit_Alpha t1_jc352hh wrote

Thanks cloud boy! You are the only one I trust for weather!


Strict_Zebra_3585 t1_jc4doaq wrote

I would really appreciate it if we could have a "sunny and 75" forecast. I'm rejecting this forecast. Thank you in advance.


Gatorrea t1_jc4fxlr wrote

My job has a "no snow days policy" so wish me luck. Thank you Cloud Boy for the accurate climate forecast.


hendrix320 t1_jc4i3ce wrote

Thats a terrible policy, how do they justify that?


Gatorrea t1_jc4im85 wrote

They're like "you live in New England so you know how to manage this situations" haha.


tuctrohs t1_jc4mivh wrote

I know how to manage situations like this. By staying home.


Ok_Low_1287 t1_jc4npfc wrote

I sort of agree with that, but within limits. What kind of company is it?


Gatorrea t1_jc4nx0m wrote

Healthcare 🥲


Ok_Low_1287 t1_jc4ogpc wrote

well, yeah, that's probably essential services... but I hope you get a day off anyway.


thelasagna t1_jc6k3ge wrote

Ugh same. In my sect we have more leniency if you are very far but otherwise we will see you in there!!


ReauxChambeaux t1_jc3e74f wrote

When you say 24+ on pack monadnock do mean literally on the summit. Or the area around it…specifically Temple?


TheCloudBoy OP t1_jc3gq09 wrote

On the summits themselves!


ReauxChambeaux t1_jc3i7fh wrote

Okay, that’s pretty impressive totals…and I’ve picked a terrible week to leave my wife to look after the house! I’m gonna be working this off for a long time!


Plastikman19 t1_jc33kfw wrote

This boy is at the top of his game.


jenkemeater619 t1_jc3dbki wrote

Thanks again for this. Been checking all day for your update! I dont even bother checking the news cause I know cloudboy has the more accurate shit!

I sort of agree with the above comment about the pastel colors. It takes me a minute or two to match the colors up correctly. Beggers cant be choosers though. Maybe I should be tested for color blindness


HillyjoKokoMo t1_jc3bdhm wrote

So I take it I might be losing power due to this storm ? Heavy wet snow if I'm understanding right...


Queasy_Turnover t1_jc3oy3u wrote

Hopefully not, but I'm going in to this assuming I'll lose power so I'm planning accordingly.


thetruthaboutcows t1_jc2scm8 wrote

I don’t envy the TV mets on this storm. One of the most challenging forecasts I’ve seen especially for SE NH and around the 495 belt into the Merrimack Valley. Your map looks good though, maybe we’ll get a little better model consensus this evening but it’s looking more like a nowcast event.


Inariele t1_jc3mze7 wrote

Urgh up to 16 inches in my area....I still have an entire snow hill in my drive way. That better be the last snow T_T anyway thanks for all the effort


Hutwe t1_jc3noam wrote

So, If what I'm seeing is correct - Crotched Mountain could get some serious snowfall and Pats Peak is right on the edge of some. Nice!


prokool6 t1_jc44r02 wrote

Just wondering, are the differences following the Pemi and Baker river valleys just explained by elevation? I’ve always had a tough time telling (anecdotally) if the extra ~500-100 feet predictably makes much of a difference in snowfall.


picklehaub t1_jc52m63 wrote

It really does seem to be the elevation, I live about 2 miles from work. House is 200ish feet higher and has 2’ of snow on the ground vs 6-8” at work (right on a good size river).Even driving home at lunch time during a storm I can tell the difference in snow from top of the hill to bottom.


rmarkham t1_jc37llg wrote

If I went to work down in mass at 6am or so and left by 10am would I hit bad conditions?


tuctrohs t1_jc4my49 wrote

Looks like it's already going to have dumped a lot in Massachusetts before 6:00 a.m. and it's going to keep going until 10:00 a.m.


Emeleigh_Rose t1_jc37mdk wrote

I was hoping for another update today and here it is. Thanks, CloudBoy. Hope everyone can stay indoors and safe for this storm.


DrTartakovsky t1_jc4188h wrote

Hey @TheCloudBoy, your data is awesome. Thank you! I live in Chester, right between Derry and Raymond. Best guess, how much snow you think I’ll get?


becky984 t1_jc45sky wrote

Thanks for showing Maine on this map. We’re over here near Augusta and love the accuracy of your work!


Many-Day8308 t1_jc476gi wrote

Yes, live just across the border in Oxford County and I’ve stopped checking other sources after the last couple storms.


Azaz24712 t1_jc4km5v wrote

Thank you cloudboy!


SkeetAllOverTheWalls t1_jc4sz31 wrote

I hate the forecast but you’ve gone from being a cloud boy to a cloud man.


DogeFlutie t1_jc5aelr wrote

I never get as much snow as these maps predict. Usually it’s about half as much. (I’m near Nashua.)


dogownedhoomun t1_jc5tp9p wrote

Rain rain rain here at almost 3am... however I'm on the coast


overdoing_it t1_jc68xrb wrote

Snow this morning in Pittsfield is very wet and heavy. Less than an inch but still a struggle to shovel. Driving to polls is not going to be fun, I'll probably die.

Edit: I lived. Roads not that bad yet. Well they're bad but I'm used to it.


Coherent-Paradox t1_jc3v0sa wrote

“Please … call this a ‘bomb cyclone’”

  • TheCloudBoi

Big-al027 t1_jc4z1cg wrote

Any idea what time would be safest to drive from Nashua and south into mass Tuesday night?


stanmeower t1_jc5br8n wrote

Rindge here. Thinking 12 to 24 here and here it is almost Spring!


justnocrazymaker t1_jc6twon wrote

Thank you! Checking in from western Maine, where your forecast is far and away the most accurate.


movdqa t1_jc37df0 wrote

Looks like another storm, a bit bigger than previous storms but temperatures are going to be warm enough, at least in my area, so that it should be easier to clear. It's enough snow to clear off my roof though. Plan tomorrow is to go to the gym early morning, come home, do errands and then shovel tomorrow afternoon on and off. Looks like the most intense part will be around noon - 5 PM. This looks messy for the afternoon commute.


Different_Ad7655 t1_jc4enxx wrote

Well all I can tell you, after almost 40 years of commercially snow plowing, it's going to snow in March, often very significant snowfall, nawth eastuhs in March, heavy and wet and possibly as late as early April absolutely nothing new.. turn off the TV and just sit back and enjoy it. Just be surprised