The first 4-panel below shows the GOES layered PWAT products for AR and vicinity. Upper left is total PW, upper right is Sfc-900 mb, lower left is 900-700mb, and lower right is 700-300 mb. (These are actually sigma levels, e.g., .7 to .3) The latter shows deeper moisture around the MCV over eastern OK and extending into west AR, with drier air aloft farther east. Perhaps a more favorable environment for deep convection and/or heavier rain.
The next image below is the same except for the upper left panel, which shows the GOES derived-product total PWAT. Note there is a lot of blank area or missing data due to cloud cover. In the first image above, these gaps are filled in with data from the latest GFS, to make a smoother and more complete product. Where both sources have data, the values are similar but not exactly the same.
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