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January 5-6 Thing II: STORM MODE


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2 minutes ago, jayyy said:


I did like the uniformity of the 3k and NBM’s precip for sure. Less complex

I think the dual band structure is probably going to happen. NBM sorta smoothes that out. 3k NAM does a similar swath through somewhat overlapping zones of the banding at different stages of the storm. 

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Things I am sure of after the last 24 hours:

- The 12kNAM is indeed run on a 2001 Nokia flip phone

- This subforum is completely out of snowstorm shape. Worrying about the NAM 36+ hrs from start time lol. The 2016 version of us would be howling with laughter 

- The Euro is still king/queen/grandmaster

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First call:

I’m in favor of the northern group of models and not really buying into the foot plus snows around EZF, nor am I buying the weird “dry slot” in the WAA portion of the storm. Even though confluence is very strong and we have a cold antecedent airmass, this is a very dynamic system with a powerful 70kt low level jet. 

We’ll see dual banding with 850 and 700 fgen, with the former along i-66 (give or take) and the latter between i-70 and the M/D line. Mix line likely to reach DC, and sleet/fzdz may even occur as far north as i-70 WHEN rates lighten up (heavier rates will be snow). 

Greatest uncertainty is whether a coastal gets going in time for us to get an extra few inches. In my first call, I say it will.

My snowfall forecast (east of blue ridge):

South of CHO - EZF - La Plata line: 1-3” heavy mix
Delmarva South of Salisbury: 3-5”
Delmarva North of Salisbury: 5-10”++
EZF north to I-66: 3-6” mix
Between I-66 and I-70: 5-10” with some sleet/fzdz
Between I-70 and M/D line: 6-12” all snow

I reserve my right to make a final call when I see the need to make changes.

P.S. Beltway DC metro? 4-7” with some mix

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1 minute ago, Terpeast said:

First call:

I’m in favor of the northern group of models and not really buying into the foot plus snows around EZF, nor am I buying the weird “dry slot” in the WAA portion of the storm. Even though confluence is very strong and we have a cold antecedent airmass, this is a very dynamic system with a powerful 70kt low level jet. 

We’ll see dual banding with 850 and 700 fgen, with the former along i-66 (give or take) and the latter between i-70 and the M/D line. Mix line likely to reach DC, and sleet/fzdz may even occur as far north as i-70 WHEN rates lighten up (heavier rates will be snow). 

Greatest uncertainty is whether a coastal gets going in time for us to get an extra few inches. In my first call, I say it will.

My snowfall forecast (east of blue ridge):

South of CHO - EZF - La Plata line: 1-3” heavy mix
Delmarva South of Salisbury: 3-5”
Delmarva North of Salisbury: 5-10”++
EZF north to I-66: 3-6” mix
Between I-66 and I-70: 5-10” with some sleet/fzdz
Between I-70 and M/D line: 6-12” all snow

I really like your thinking...

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3 minutes ago, Terpeast said:

First call:

I’m in favor of the northern group of models and not really buying into the foot plus snows around EZF, nor am I buying the weird “dry slot” in the WAA portion of the storm. Even though confluence is very strong and we have a cold antecedent airmass, this is a very dynamic system with a powerful 70kt low level jet. 

We’ll see dual banding with 850 and 700 fgen, with the former along i-66 (give or take) and the latter between i-70 and the M/D line. Mix line likely to reach DC, and sleet/fzdz may even occur as far north as i-70 WHEN rates lighten up (heavier rates will be snow). 

Greatest uncertainty is whether a coastal gets going in time for us to get an extra few inches. In my first call, I say it will.

My snowfall forecast (east of blue ridge):

South of CHO - EZF - La Plata line: 1-3” heavy mix
Delmarva South of Salisbury: 3-5”
Delmarva North of Salisbury: 5-10”++
EZF north to I-66: 3-6” mix
Between I-66 and I-70: 5-10” with some sleet/fzdz
Between I-70 and M/D line: 6-12” all snow

looks good.  I might put out a call later.  Maybe wait for tomorrow.  

Looks like you're calling  for around 5" at DCA and 6" on my mountain here in DC.  Seems reasonable, though I hope I do better

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6 minutes ago, Terpeast said:

First call:

I’m in favor of the northern group of models and not really buying into the foot plus snows around EZF, nor am I buying the weird “dry slot” in the WAA portion of the storm. Even though confluence is very strong and we have a cold antecedent airmass, this is a very dynamic system with a powerful 70kt low level jet. 

We’ll see dual banding with 850 and 700 fgen, with the former along i-66 (give or take) and the latter between i-70 and the M/D line. Mix line likely to reach DC, and sleet/fzdz may even occur as far north as i-70 WHEN rates lighten up (heavier rates will be snow). 

Greatest uncertainty is whether a coastal gets going in time for us to get an extra few inches. In my first call, I say it will.

My snowfall forecast (east of blue ridge):

South of CHO - EZF - La Plata line: 1-3” heavy mix
Delmarva South of Salisbury: 3-5”
Delmarva North of Salisbury: 5-10”++
EZF north to I-66: 3-6” mix
Between I-66 and I-70: 5-10” with some sleet/fzdz
Between I-70 and M/D line: 6-12” all snow

I reserve my right to make a final call when I see the need to make changes.

I sure hope you are right. I’m dying for a real storm. I haven’t seen a storm more than 6” in years. 

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9 minutes ago, Terpeast said:

First call:

I’m in favor of the northern group of models and not really buying into the foot plus snows around EZF, nor am I buying the weird “dry slot” in the WAA portion of the storm. Even though confluence is very strong and we have a cold antecedent airmass, this is a very dynamic system with a powerful 70kt low level jet. 

We’ll see dual banding with 850 and 700 fgen, with the former along i-66 (give or take) and the latter between i-70 and the M/D line. Mix line likely to reach DC, and sleet/fzdz may even occur as far north as i-70 WHEN rates lighten up (heavier rates will be snow). 

Greatest uncertainty is whether a coastal gets going in time for us to get an extra few inches. In my first call, I say it will.

My snowfall forecast (east of blue ridge):

South of CHO - EZF - La Plata line: 1-3” heavy mix
Delmarva South of Salisbury: 3-5”
Delmarva North of Salisbury: 5-10”++
EZF north to I-66: 3-6” mix
Between I-66 and I-70: 5-10” with some sleet/fzdz
Between I-70 and M/D line: 6-12” all snow

I reserve my right to make a final call when I see the need to make changes.

P.S. Beltway DC metro? 4-7” with some mix

I think the Beltway sees 6-10" but you're the meteorologist here so I'm probably in denial.

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