icicleman Posted February 20, 2021 Report Share Posted February 20, 2021 In the Feb 18th OBS thread, Rainshadow said "I have to pay attention to these sw flow aloft events going forward if there is an orographic favoring of these bands along/northwest of the fall line. This and the Super Bowl they almost fell one on top of the other." My question: Since the frontogenesis banding occurs so high (5000-10000 ft), does the wind speed and direction also affect the location of the resultant "surface accumulation band" where we actually measure the fallen precipitation? It seems like the placement of this accumulation band could vary by tens of miles, depending upon wind profile. Rt 202 and I-95 are only about 15-20 miles apart. Or are the wind profiles not that different from storm to storm? Thanks. Edit on 2/23: I did a layman's google search and found this paper from 2019: https://journals.ametsoc.org/view/journals/mwre/147/11/mwr-d-19-0036.1.xml They note that "Environments that accompany mesoscale snowbands in extratropical cyclones feature strong midlevel frontogenesis and weak symmetric stability, conditions conducive to vigorous ascent." (They use the term "lofting" to describe the ascent.) They tried to answer "to answer the more fundamental question of how much spatial separation may occur between regions where snow crystals form and grow aloft, relative to where they reach the surface." They find that "considerable horizontal displacement can occur between the locations of strongest ascent and heaviest surface snowfall." I don't understand mid and low level wind patterns enough to guess whether the horizontal displacement is consistent (in orientation and/or extent) for storms in our area. Quote Link to comment Share on other sites More sharing options...
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