It wasn't necessarily rare, it was just the position/track of the low wasn't as traditional as it has been as of late.
Instead of a low ejecting from CO>KS/NE. We had a low eject from NM>TXPH
The result was everything was shifted further south.
Triple point was in TXPH/W OK instead of KS; the isolated dryline action was located down across NW/W TX
The warmfront nosing up from the S was happening across S/C OK instead of KS.
For example, take this map from just earlier this year and shift everything down to the SW over TX/OK and you bring the same results with it.
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