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December 25-29th Storm Disco


Chicago Storm

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Looking forward to the overnight discos.  Probably won't wait up for them but curious about what LOT will say/do.  Wonder if there will be a southward expansion of the winter storm watch or if they won't have enough confidence.

 

IWX won't do anything this morning, if the 06 and 12Z runs keep getting more icey they may issue a Winter Weather Advisory this afternoon.

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00z GEM has the low down to 988mb west of STL at 18z Monday.  One of the deeper solutions I've noticed recently.  

 

Wondering if the slight southeastward shift on recent runs is from the impact of convection along the BL.  We all know how that can impact boundaries in the warm season.  Probably not as pronounced, but maybe the models had underestimated the impact of heavy convection along the baroclinic zone.

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00z GEM has the low down to 988mb west of STL at 18z Monday.  One of the deeper solutions I've noticed recently.  

 

Wondering if the slight southeastward shift on recent runs is from the impact of convection along the BL.  We all know how that can impact boundaries in the warm season.  Probably not as pronounced, but maybe the models had underestimated the impact of heavy convection along the baroclinic zone.

 

Pretty unusual (and frustrating) to see a SE shift happen AND the storm trend stronger. Both happening at the same time sort of cancels out any benefits for those holding out for a more wintry solution. 

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Pretty unusual (and frustrating) to see a SE shift happen AND the storm trend stronger. Both happening at the same time sort of cancels out any benefits for those holding out for a more wintry solution. 

 

Yeah.  Since deep convection looks to continue along the boundary maybe we'll see some additional tweaks southeast in subsequent runs.  

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00z GEM has the low down to 988mb west of STL at 18z Monday.  One of the deeper solutions I've noticed recently.  

 

Wondering if the slight southeastward shift on recent runs is from the impact of convection along the BL.  We all know how that can impact boundaries in the warm season.  Probably not as pronounced, but maybe the models had underestimated the impact of heavy convection along the baroclinic zone.

57 mb gradient

 

 

post-14-0-55486000-1451194609_thumb.png

 

 

Still a decent discrepancy in the surface low intensity for this close.

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57 mb gradient

 

 

attachicon.gifgem_mslp_pcpn_frzn_us_7.png

 

 

Still a decent discrepancy in the surface low intensity for this close.

 

That's one heck of a gradient.

 

Not in this sub, but our storm is kicking up some serious winds in the cold sector down in eastern NM and the panhandle of TX.  82mph recently on the eastern side of Clovis NM!   :o

 

 

EDIT:  Ninja'd by Hoosier lol

aktkip.jpg

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57 mb gradient

 

 

attachicon.gifgem_mslp_pcpn_frzn_us_7.png

 

 

Still a decent discrepancy in the surface low intensity for this close.

 

This hasn't been really been discussed as much as the threat for Ice, but with that type of gradient and the 50-60kt LLJ, another thing to also keep an eye on will be potential blizzard conditions from NE Iowa / SE Minnesota through Central WI and Northern MI.

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Pretty unusual (and frustrating) to see a SE shift happen AND the storm trend stronger. Both happening at the same time sort of cancels out any benefits for those holding out for a more wintry solution. 

 

Not for those who are now just NW of the projected track on some of the models.  If the models trended weaker while trending SE, QPF in the cold sector would likely decrease as well, so I find that should counteract the negative of the models trending SE but stronger.

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Euro is the only outlier this run...

 

Makes sense since the Euro typically doesn't do well with convection, even in the near/short term, that it would be last to the party on a shift that is likely due to deep convection shifting the baroclinic zone to the SE.  If it does pull the coup, all the other models were lost on this.

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Makes sense since the Euro typically doesn't do well with convection, even in the near/short term, that it would be last to the party on a shift that is likely due to deep convection shifting the baroclinic zone to the SE.  If it does pull the coup, all the other models were lost on this.

 

 

I'm not saying you're wrong, but is there any reason to think the Euro would do worse with convection than other global models?

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Makes sense since the Euro typically doesn't do well with convection, even in the near/short term, that it would be last to the party on a shift that is likely due to deep convection shifting the baroclinic zone to the SE.  If it does pull the coup, all the other models were lost on this.

 

It was last to get a clue for the November snowstorm. I think it will get it by the 12z run tomorrow.

I could see the other models continuing the SE bleeding a couple more runs. Convection is intense down to the south. Here only 0.15" of rain today.

 

CMC tracking the low right over head.

 

pres_short.gif

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I'm not saying you're wrong, but is there any reason to think the Euro would do worse with convection than other global models?

 

Well it would do worse than the GFS, and NAM especially (given its higher resolution).  Probably similar to the GEM, though, which has been in the SE camp for awhile, even before the convection appeared.

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BULLETIN - IMMEDIATE BROADCAST REQUESTED  

FLOOD WARNING  

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  

1120 PM CST SAT DEC 26 2015  

 

ILC053-075-091-105-INC007-073-111-271715-  

/O.NEW.KLOT.FA.W.0019.151227T0520Z-151227T1715Z/  

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/  

IROQUOIS IL-FORD IL-LIVINGSTON IL-KANKAKEE IL-JASPER IN-BENTON IN-  

NEWTON IN-  

1120 PM CST SAT DEC 26 2015  

 

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A  

 

* FLOOD WARNING FOR...  

IROQUOIS COUNTY IN EAST CENTRAL ILLINOIS...  

FORD COUNTY IN EAST CENTRAL ILLINOIS...  

SOUTHEASTERN LIVINGSTON COUNTY IN CENTRAL ILLINOIS...  

SOUTHEASTERN KANKAKEE COUNTY IN NORTHEASTERN ILLINOIS...  

JASPER COUNTY IN NORTHWESTERN INDIANA...  

BENTON COUNTY IN NORTHWESTERN INDIANA...  

NEWTON COUNTY IN NORTHWESTERN INDIANA...  

 

* UNTIL 1115 AM CST SUNDAY/1215 PM EST SUNDAY/  

 

* AT 1115 PM CST /1215 AM EST/...DOPPLER RADAR INDICATED RAIN AND  

EMBEDDED THUNDERSTORMS PRODUCING HEAVY RAINFALL WHICH WILL CAUSE  

FLOODING. AS MUCH AS THREE TO THREE AND A HALF INCHES OF RAIN HAVE  

ALREADY FALLEN SINCE EARLY SATURDAY SOUTH OF U.S. 24...AND AN  

ADDITIONAL ONE TO TWO INCHES OF RAIN ARE POSSIBLE ACROSS THIS  

SAME AREA OVERNIGHT INTO EARLY SUNDAY MORNING.  

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