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1/21 Redeveloping Clipper Storm


DDweatherman

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Nobody posted the good DT stuff.

 

 

That's the SREF.  Those are biased high by the ARWs, which are known to be too wet.  That said, when you take out the low outliers as well, you still end up with a pretty hefty (near double digit) mean snowfall. 

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Big difference between March 6th and January 20th. Especially with the arctic air thats coming in.

 

Yes, difference in time of year (obviously) and the overall synoptic set-up.  But beyond that, there was a much higher degree of uncertainty with the March 6 event, even as the expectation was a good hit.  If I recall correctly, the SREF went bonkers, the NAM had a couple of runs as time got close that were really good, the GFS was so-so, and the Euro was not all that excited.  Also, there was a much larger spread of possibilities...and the BL conditions were (obviously) far more marginal.

 

But I agree, that one still stings!!

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That's the SREF.  Those are biased high by the ARWs, which are known to be too wet.  That said, when you take out the low outliers as well, you still end up with a pretty hefty (near double digit) mean snowfall. 

Ah, he didn't specify it wasn't his own glorious forecast. I guess it was obvious since it wasn't poorly drawn lines.

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The SREF probabilities are computer generated based on the ensemble forecast.  It's not a human forecast.  That said, some human-input probabilistic forecasts (i.e., like SPC severe weather forecasts) have very specific definitions which most people don't take time to understand. 

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GFS:

 

DCA:

 

140121/1500Z 21 04012KT 26.9F SNOW 14:1| 0.6|| 0.00|| 0.00|| 0.046 14:1| 0.6|| 0.00|| 0.00|| 0.05 100| 0| 0
140121/1800Z 24 03015KT 22.2F SNOW 16:1| 2.0|| 0.00|| 0.00|| 0.128 15:1| 2.7|| 0.00|| 0.00|| 0.17 100| 0| 0
----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---
140121/2100Z 27 36015KT 18.8F SNOW 17:1| 3.2|| 0.00|| 0.00|| 0.185 16:1| 5.9|| 0.00|| 0.00|| 0.36 100| 0| 0
140122/0000Z 30 35015KT 15.5F SNOW 21:1| 2.8|| 0.00|| 0.00|| 0.134 17:1| 8.6|| 0.00|| 0.00|| 0.49 100| 0| 0
140122/0300Z 33 34015KT 12.8F SNOW 22:1| 0.9|| 0.00|| 0.00|| 0.043 18:1| 9.5|| 0.00|| 0.00|| 0.54 100| 0| 0

 

IAD:

 

140121/1500Z 21 04012KT 22.5F SNOW 19:1| 1.4|| 0.00|| 0.00|| 0.074 19:1| 1.4|| 0.00|| 0.00|| 0.07 100| 0| 0
140121/1800Z 24 03013KT 19.5F SNOW 19:1| 3.2|| 0.00|| 0.00|| 0.169 19:1| 4.6|| 0.00|| 0.00|| 0.24 100| 0| 0
----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---
140121/2100Z 27 36013KT 15.7F SNOW 23:1| 3.7|| 0.00|| 0.00|| 0.160 21:1| 8.3|| 0.00|| 0.00|| 0.40 100| 0| 0
140122/0000Z 30 34014KT 13.9F SNOW 14:1| 1.6|| 0.00|| 0.00|| 0.109 19:1| 9.9|| 0.00|| 0.00|| 0.51 100| 0| 0
140122/0300Z 33 34014KT 12.3F SNOW 13:1| 0.4|| 0.00|| 0.00|| 0.030 19:1| 10.3|| 0.00|| 0.00|| 0.54 100| 0| 0

 

BWI:

 

140121/1500Z 21 04014KT 24.0F SNOW 19:1| 0.6|| 0.00|| 0.00|| 0.033 19:1| 0.6|| 0.00|| 0.00|| 0.03 100| 0| 0
140121/1800Z 24 03017KT 20.0F SNOW 18:1| 2.1|| 0.00|| 0.00|| 0.119 18:1| 2.7|| 0.00|| 0.00|| 0.15 100| 0| 0
----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---
140121/2100Z 27 01019KT 17.3F SNOW 17:1| 3.3|| 0.00|| 0.00|| 0.197 17:1| 6.0|| 0.00|| 0.00|| 0.35 100| 0| 0
140122/0000Z 30 36019KT 15.0F SNOW 20:1| 2.8|| 0.00|| 0.00|| 0.144 18:1| 8.9|| 0.00|| 0.00|| 0.49 100| 0| 0
140122/0300Z 33 34019KT 11.4F SNOW 16:1| 0.9|| 0.00|| 0.00|| 0.054 18:1| 9.8|| 0.00|| 0.00|| 0.55 100| 0| 0
140122/0600Z 36 33018KT 8.3F SNOW 10:1| 0.1|| 0.00|| 0.00|| 0.006 18:1| 9.8|| 0.00|| 0.00|| 0.55 100| 0| 0

 

MRB:

 

140121/1200Z 18 06008KT 20.6F SNOW 18:1| 0.2|| 0.00|| 0.00|| 0.009 18:1| 0.2|| 0.00|| 0.00|| 0.01 100| 0| 0
140121/1500Z 21 04012KT 18.9F SNOW 15:1| 2.6|| 0.00|| 0.00|| 0.174 15:1| 2.8|| 0.00|| 0.00|| 0.18 100| 0| 0
140121/1800Z 24 03014KT 17.0F SNOW 20:1| 3.7|| 0.00|| 0.00|| 0.181 18:1| 6.5|| 0.00|| 0.00|| 0.36 100| 0| 0
----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---
140121/2100Z 27 01013KT 14.4F SNOW 22:1| 2.8|| 0.00|| 0.00|| 0.131 19:1| 9.3|| 0.00|| 0.00|| 0.49 100| 0| 0
140122/0000Z 30 34013KT 13.9F SNOW 8:1| 0.7|| 0.00|| 0.00|| 0.081 17:1| 10.0|| 0.00|| 0.00|| 0.58 100| 0| 0
140122/0300Z 33 33014KT 11.4F SNOW 26:1| 0.4|| 0.00|| 0.00|| 0.017 18:1| 10.4|| 0.00|| 0.00|| 0.59 100| 0| 0

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