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February 12-13 Storm: Title TBD


stormtracker

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Is it a surprise to anyone that the nam is super amped outside of 48 hours? It could be right as matt was saying but not because the nam is showing it at 60+ hours

Mixing is almost inevitable for 95 corridor unless the stars align. I personally think this is a good run. Gfs should start showing some sort of consolidated coastal soon. Most likely in an hour.

 

Def agree with this post... all i took from this run is that that 2m temps were below freezing and all precip is frozen... 850s can be worked out later and as we all know and others have said... it mixes in the the big ones around DC

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Is it a surprise to anyone that the nam is super amped outside of 48 hours? It could be right as matt was saying but not because the nam is showing it at 60+ hours

Mixing is almost inevitable for 95 corridor unless the stars align. I personally think this is a good run. Gfs should start showing some sort of consolidated coastal soon. Most likely in an hour.

Mr. Chill why is the GFS so awful with east coast lows during the winter? 

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As Mitch said earlier, if the H5 depiction shown at 84 hrs is taken verbatim, there would definitely be an enhancement of precip back into the region in the form of snow. The NAM as a whole should be taken with a grain a salt past 48 hours, but it is very interesting to see how the model evolved the storm. One of the main players that was sparingly mentioned was the GL low that was affecting the earlier models runs. With the low center in the GL region on earlier caused a serious cut back on precip around the I-81 corridor and focused on a main area of precip east of I81 to the coast. The 0z NAM has significantly backed off of the low center in the lakes, which allows for a greater expansion of precip to the west and now everyone gets involved.

 

I'm actually stunned by the solution tonight. Would be a major storm for everyone on here, except maybe the immediate coast of MD, but that region is always prone to changeover. I wouldn't be too concerned with the 850mb temps at this range, but it would be good to at least take note for areas prone to precipitation issues (sorry DC). I still think with the depiction at H5 this storm has more room to bomb out faster than what was shown on the NAM. Plenty of runs to go. A lot of patience will be tested up and down the coast from run to run, but it looks like we have a possibly epic storm on our hands. 

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Mr. Chill why is the GFS so awful with east coast lows during the winter?

No idea. It's good with northern stream vorts in fast flow. Better than the euro imo. It struggles with miller A's and b's. We haven't had a coastal in so long I can't remember specific biases in a setup like this. Wes and Matt would know much more than me with your question.

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Mr. Chill why is the GFS so awful with east coast lows during the winter? 

It wasn't made for that purpose really. It's a short term model that excels in convective forecasting.  People just like the higher resolution IMO.

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The Nam is a joke in SC and GA....Goes from almost 20 inches to 0 inches in a 10 mile span........really???

 

Actually it's the wxbell clown maps that are a joke. If 850mb temps are well above freezing, but there's a cold spot lower in the column, those stupid maps will show snow, even if the model is actually depicting sleet or zr.

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DCA:

 

140212/2300Z 71 06010KT 29.0F SNOW 11:1| 0.2|| 0.00|| 0.00|| 0.015 11:1| 0.2|| 0.00|| 0.00|| 0.02 100| 0| 0
140213/0000Z 72 04012KT 28.7F SNOW 9:1| 0.5|| 0.00|| 0.00|| 0.052 10:1| 0.6|| 0.00|| 0.00|| 0.07 100| 0| 0
----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---
140213/0100Z 73 04012KT 28.5F SNOW 10:1| 0.9|| 0.00|| 0.00|| 0.084 10:1| 1.5|| 0.00|| 0.00|| 0.15 100| 0| 0
140213/0200Z 74 04013KT 28.5F SNOW 11:1| 1.1|| 0.00|| 0.00|| 0.096 10:1| 2.6|| 0.00|| 0.00|| 0.25 100| 0| 0
140213/0300Z 75 04016KT 28.5F SNOW 10:1| 0.8|| 0.00|| 0.00|| 0.085 10:1| 3.4|| 0.00|| 0.00|| 0.33 91| 9| 0
140213/0400Z 76 03020KT 29.4F FZRA 0:1| 0.0|| 0.00|| 0.24|| 0.231 10:1| 3.4|| 0.00|| 0.24|| 0.56 0| 0|100
140213/0500Z 77 04018KT 30.8F FZRA 0:1| 0.0|| 0.00|| 0.19|| 0.181 10:1| 3.4|| 0.00|| 0.43|| 0.74 0| 0|100
140213/0600Z 78 03015KT 31.7F FZRA 0:1| 0.0|| 0.00|| 0.14|| 0.130 10:1| 3.4|| 0.00|| 0.57|| 0.87 0| 0|100
----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---
140213/0700Z 79 36012KT 32.1F FZRA 0:1| 0.0|| 0.00|| 0.00|| 0.101 10:1| 3.4|| 0.00|| 0.57|| 0.98 0| 0|100
140213/0800Z 80 35016KT 31.0F PL 0:1| 0.0|| 0.10|| 0.00|| 0.052 10:1| 3.4|| 0.10|| 0.57|| 1.03 0|100| 0
140213/0900Z 81 35016KT 29.7F FZDZ 0:1| 0.0|| 0.00|| 0.02|| 0.018 10:1| 3.4|| 0.10|| 0.59|| 1.04 0| 0|100
140213/1000Z 82 36018KT 29.7F FZRA 0:1| 0.0|| 0.00|| 0.01|| 0.010 10:1| 3.4|| 0.10|| 0.60|| 1.06 0| 0|100
140213/1100Z 83 36015KT 31.0F FZRA 0:1| 0.0|| 0.00|| 0.01|| 0.006 10:1| 3.4|| 0.10|| 0.60|| 1.06 0| 0|100
140213/1200Z 84 36013KT 31.4F FZRA 0:1| 0.0|| 0.00|| 0.00|| 0.005 10:1| 3.4|| 0.10|| 0.61|| 1.07 0| 0|100
============================================================================================================================

 
NAM even has mixing issues back this way. Like was said earlier. We all will see some sleet with the big ones.
 
BWI is about identical to this  Iad is a bit better. MRB is 11 inches through 84 all snow. 
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