This value shows how much water the atmosphere is capable of holding at a given time, and consequently, how much rainfall is possible with any one storm (or a number of them hitting one location). For tomorrow, the PWAT value shows that storms will have near-maximum conditions to deliver copious rainfall amounts across the region. Values shown in this graphic (see below) show that the atmosphere will be primed to deliver over 2 inches per hour rainfall rates in some cases with any given storm!
I suspect that if this trend holds, the NWS might consider issuing flash flood watches later today for parts, or all of the area for late tomorrow afternoon into tomorrow night.
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