tpbbls -- what happens right along the front range is you can get these 'sustained' storms -- once a storm gets away from the slopes and out over the plains, it's gonna move, even if slowly, pushed by the mid/upper flow -- but right up against the hills, in particular if mid/upper flow isn't all that strong (sufficient to keep carrying the anvil away so the storm doesn't snuff itself out with its own outflow, but not strong enough to really grab the storm and carry it away from the slopes and out over the plains), a storm can initiate based on an uninterrupted moist/unstable lower-level flow coming into the slopes that just keeps being lifted by the slopes, and can thus remain more or less static (or more precisely, keep regenerating in the same place) for sometimes hours on end as the low-level inflow keeps coming into the slopes -- not too many years ago there was a whopper of such a sustained storm over Cheyenne that, as I recall it, began one evening and lasted till past dawn the next morning before finally letting up/moving off, left drifts of the better part of a foot of hail that fell formed in the resulting flash flooding that were over 10' high, and put down two (relatively minor) tornadoes inside the city limits, one shortly after it began in the evening on one side of town, another shortly before dawn over on the other side of town
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