Synopsis:
All eyes on big storm in the Plains, for which current indications are a miss to the south. But there are two other small-scale features worth following.
Short-term:
On Friday night, a small vortmax in the 500mb flow just to our north appears to trigger a few scattered snow showers, which can be seen most clearly in the 4km NAM. For now they are forecasted to stay north of the NY/PA border, but this feature should be monitored. Any precipitation will probably be light.
Long-term:
A small pocket of vorticity is left behind in the wake of the large storm. This is modeled by the GFS to move across the Ohio River Valley early next week. The 6Z run brought it directly over PA and significantly enhanced the cloud cover for Monday night; while the 12Z run has it going further to the south and at an earlier time, with practically no impact on PA. Either way, the formation of a surface low and precipitation seems to be delayed until it reaches offshore where the baroclinicity is stronger.
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