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January 5-6 Thing II: STORM MODE


stormtracker
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Currently in a bit of a dry slot in SE Missouri, but basically none of the FZRA has materialized in my area. Very light snow at the moment after about 2 inches of pounding sleet earlier this AM.

Also, NWS St. Louis has slightly increased totals to my north. And added this nice gem:

We also did add thunder to the forecast as there
have been notable convective elements and occasional lightning.

So yeah, this storm has a history of thunder and lightning. I can't imagine that changing when it gets to you all.

 

LightningDay1.jpg

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Interesting signature for banding in the 06z GFS (and 06z 3-km NAM) around 12z-18z Monday, just as the dry air starts to work in above 600 mb. This dry air above the lower-level moisture produces convective instability above the frontal surface between 750-650 mb south of the frontogenesis max around 800 mb. This instability would favor vertical motion and ice crystal generating cells just to the north of the approaching dry air. Given the temperatures > -12C and the likely presence of supercooled water, graupel is a definite possibility within this area of precipitation.

35850034_gfs_2025010506_fh36_xsection_37.69N77.83W_40.47N75.89W_FGEN-Theta-e-Omega.thumb.png.9adeb32d546e80f896646e93c0e29598.png

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