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March 21-24 Winter Storm


kab2791

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This cross-polar flow junk makes this a somewhat low probability forecast even 84 hours out. Currently it does seem that there will be less interaction of the northern stream than previously projected--hence the recent north trends. Still dealing with a phase with the polar vortex through hour 24--could still go either way in terms of the exact position of the stretching deformation zone.

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0z Nam and GFS are warmer and north...and both had dropsonde data from the pacific if I'm not mistaking. Make of that what you will.

The biggest variability lies with the northern stream PV and its interaction with the jet streak progged to phase with it at 24 hrs. Current GFS analysis over the northern hemisphere. The biggest variability lies with the northern stream--bot the Pacific trough ejecting into the plains. Models stink it up with these phase interactions with the PV and cross-polar flow.

post-999-0-65928600-1300596363.gif

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DET all rain and pressure gets down to 996mb here which is quite low compared to any other model...

MSP:

TUE 06Z 22-MAR   4.5     4.9    1014      82      88    0.03     563     552    
TUE 12Z 22-MAR   2.4     3.2    1011      95      86    0.37     561     552    
TUE 18Z 22-MAR   2.4     2.8    1006      95      36    0.20     558     553    
WED 00Z 23-MAR   2.1     5.8    1000      94      77    0.10     552     552    
WED 06Z 23-MAR   0.7    -1.0     997      95      86    0.54     543     545    
WED 12Z 23-MAR  -0.6    -3.4     998      91      31    0.09     537     538    
WED 18Z 23-MAR  -1.3    -7.8    1003      79      71    0.07     536     534    
THU 00Z 24-MAR  -4.4   -11.9    1012      76      90    0.05     540     530 

FAR:

TUE 12Z 22-MAR   1.2     1.7    1009      76      88    0.02     555     548    
TUE 18Z 22-MAR   1.5    -1.1    1005      86      95    0.11     552     548    
WED 00Z 23-MAR   0.3    -4.5    1003      89      98    0.27     547     544    
WED 06Z 23-MAR  -2.2    -7.5    1004      88     100    0.38     542     539    
WED 12Z 23-MAR  -3.6   -10.1    1006      88      92    0.38     538     533    
WED 18Z 23-MAR  -4.7   -12.7    1013      71      94    0.16     540     530    
THU 00Z 24-MAR  -4.6   -13.1    1019      62      14    0.02     544     529    
THU 06Z 24-MAR -12.9   -13.1    1024      81      12    0.00     546     528  

GFK:

TUE 18Z 22-MAR   2.3    -1.6    1008      76     100    0.10     551     545    
WED 00Z 23-MAR   0.3    -6.2    1007      87     100    0.44     547     542    
WED 06Z 23-MAR  -2.4    -7.7    1008      87     100    0.39     543     537    
WED 12Z 23-MAR  -4.6   -10.0    1011      83      99    0.35     541     532    
WED 18Z 23-MAR  -6.3    -9.5    1017      63      12    0.06     542     529   

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