February 1st-2nd Snowstorm Part II

The other thread is close to exceeding its 30-page count. Let's continue the discussions here.

My preliminary thoughts:

1. No snow map just yet. There are still very important parts to this forecast that need to be ironed out. It will determine if the heaviest axis of snows will be toward NW or SE sections of this area. This also has implications to the temps along the shore and whether or not we're dealing with any type of dry slotting for a period of time.

2. The mid and upper levels of the atmosphere suggest we're staring down quite a monster. The epic snow amounts being shown on some of these models may not be far off. That is because of the slow movement and intense CCB this storm will possesses. Ratios will be 10:1 for most, but those under the CCB where the heaviest VV's are likely to be found may get 12:1 ratios.

3. The frigid air mass leading up to this storm has to help, right? I forgot the last time it was this cold right before a major snowstorm. That also means drier air and virga to start, but once it does finally begin snowing, it will accumulate FAST.

4. Yes there will be moments when this acts like a blizzard near the coast. Winds near 40 mph and heavy snow falling, that technically constitutes a blizzard. Is the criteria met for the NWS to issue blizzard warnings? I'm not so sure about that. At the end of the day, we're looking at an SLP around 995mb. Nice but not nearly as strong as other historic storms.

5. Tonight's 00z runs will give us clarity on pretty much everything (I hope), but we're already seeing agreement happen with some key features of this storm. It's the smaller details that make the difference of a foot or 3 inches for some people here!

Bring home the capocollo!!!!!

1st call snow map around 3-4pm today.

RGEM 6z vs 12z - confluence in Maine is stronger. Can you see it?

RGEM shows a big dry slot over our area (but we still get 5-10" of snow). Biggests totals near DC then New England.

That's 12z 3km nam is nuts at HR 60 which is 00z Tues and we all have near a foot with quite a ways to go thpugh the heaviest bands came through but extrapolated out some would see 20 maybe more. 3km nam is not in good range yet which is kinda crazy this is so long duration we will be using the models to see how it ends when it's already snowing lol

Frank_Wx wrote:RGEM shows a big dry slot over our area (but we still get 5-10" of snow). Biggests totals near DC then New England.

my god 40 inches in dc area!!! Me no likey this map hoping it's on its own. It's still good but far cry from other runs of models.

ICON has not wavered. Keeps showing obscene amounts over us

frank posted the snow map for 3km nam on other thread but look at this, many have 12+ and its still snowing moderate to hard in some locations, insane!!





and correct me if im wrong but isnt the radar map 6 hrs before the snow map? so doesnt the snow map show the previous 6 hrs? that would mean even more.

Icon tracks H5 over SNJ and places the best vorticity directly north. This actually makes sense when you think about the tightly wound trough and 250mb jet to the north

jmanley32 wrote:

Frank_Wx wrote:RGEM shows a big dry slot over our area (but we still get 5-10" of snow). Biggests totals near DC then New England.

my god 40 inches in dc area!!! Me no likey this map hoping it's on its own. It's still good but far cry from other runs of models.

Considering they haven't had a measurable snowfall in WDC for over a year for them to get three times their yearly average in one storm is highly unlikely. At least I hope it is.

Frank_Wx wrote:Icon tracks H5 over SNJ and places the best vorticity directly north. This actually makes sense when you think about the tightly wound trough and 250mb jet to the north

That’s actually not inconsistent with last NAM run either. There was a moment in the 12z NAM where the H5 appeared to be closing off over the Delmarva then it got all sloppy and elongated as you and heehaw were discussing. So the icon may be showing what the NAM will once in better range.

Through 36, 12z GFS has lower heights due to stronger confluence vs 6z

Madonne

12z



6z

GFS midday monday its barely snowing in NYC area....and DC is seeing major blitzing.

GFS looks completely lost to me, honestly.

rb924119 wrote:GFS looks completely lost to me, honestly.

i hope so it looks like the rgem that had DC in 3 ft

Irish wrote:

rb924119 wrote:GFS looks completely lost to me, honestly.

Isn't that usually the case?

Yes lol

Another trend I am seeing is the primary low hanging on longer

That gives us better WAA snows, but it does develop the secondary more east than what we saw yesterday

rb924119 wrote:GFS looks completely lost to me, honestly.

Funny I felt that way with the RGEM/NAM

H5 and surface not quite matching up

GFS has me at 5 inches....hahaha i dont buy that for a second sorry, and thats not wishcasting, not one model shows that.