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Feb 1 -3 GHD III


Brian D
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If you're learning about this stuff, an easy way to see the important changes at 500 mb is looking at run to run trends of the h5 anomalies. Pivotal weather has a nice model trend loop tool that goes back 3 days worth of runs. Very easy to see the changes just from 06z to 12z run.

The PV lobe over Hudson Bay being farther north allows the eastern positive height anomalies (ridging) downstream of trough to our southwest. These big picture changes are in addition to a much more favorable short-wave orientation and ejection described in some of the recent posts.

And to top it all off as part of all the favorable changes for a stronger system, textbook right entrance region of an anti-cyclonically curved upper level jet streak that peaks at over 200 knots. fc8d61f658fc3f1c9214dfe2ccb8e17e.jpg





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17 minutes ago, mimillman said:

Very long duration event 

12z GFS does, however, show an impressive thumping with 0.75" to 1" of QPF in 6hr from C. Illinois to NE Indiana up to Detroit. Easily 1-2"+ per hour with blizzard conditions for that period.

This is the only run to show something like it though. Most likely the ceiling in terms of potential.

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3 minutes ago, Chicago Storm said:

On the flip side, the 12z GEM shifted SE...and it was already well SE of the GFS.

Several changes aloft when taking a look at things...

-Lead wave on Mon/Tue is a bit further south, and ends up tracking further south overall.

-PV in Canada is much further south, which helps shunt the overrunning potential south.

-Main trough in the West is much more stung out/elongated and it slower, thus you end up with a much slower ejecting main storm system. Also ends up further SE than the GFS has it, do to a lot of what is mentioned in other points.

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3 minutes ago, bdgwx said:

I'm extremely suspicious of the Kuchera method here. The modeled snow depth is probably going to be more realistic at least for the STL area where ptypes are expected to be variable.

Even the 10:1 ratio map (likely also too conservative) on the GFS is pretty impressive. It would be Detroit's largest snowstorm ever, with 12" falling in 9 hours.

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Again, the thing you like to see is the consistency on multiple suites of guidance of a band of around 2 feet or more, even if the placement of it shifts/doesn't agree.  It's remarkable to see something like that being modeled in this region of the country and not just on 1 crazy run of 1 model.  

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18 minutes ago, Chicago916 said:

Odds we see aircraft sampling of the disturbance in the Pacific given potential large impacts?

NHC appears to be on it:

140 
NOUS42 KNHC 281825
REPRPD
WEATHER RECONNAISSANCE FLIGHTS
CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.
0125 PM EST FRI 28 JANUARY 2022
SUBJECT: WINTER SEASON PLAN OF THE DAY (WSPOD)
         VALID 29/1100Z TO 30/1100Z JANUARY 2022
         WSPOD NUMBER.....21-059

II. PACIFIC REQUIREMENTS
    1. FLIGHT ONE - TEAL 77
       A. 30/0000Z
       B. AFXXX 07WSE IOP07
       C. 29/1830Z
       D. 25 DROPS APPROXIMATELY 60 NM APART WITHIN AREA BOUNDED BY
          30.0N 150.0W, 30.0N 125.0W, 50.0N 125.0W, AND 50.0N 150.0W.
       E. AS HIGH AS POSSIBLE/ 29/2030Z-30/0230Z

 

Edit to add no flights planned for tomorrow

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12 minutes ago, Hoosier said:

Again, the thing you like to see is the consistency on multiple suites of guidance of a band of around 2 feet or more, even if the placement of it shifts/doesn't agree.  It's remarkable to see something like that being modeled in this region of the country and not just on 1 crazy run of 1 model.  

I liked your comparison to the Dec 2004 event. Longer duration event that threw down some big totals in the OV. Seems this one might have that potential. But, long ways to go…

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