|Deep, continuous river of tropical moisture extending from the Gulf of Mexico over the Mid Atlantic.|
|Surface weather map, 8 AM Monday, showing Tropical Storm Lee making landfall. Note the extensive slow-moving cold front along the Appalchians.|
|Surface weather map, 8 AM Tuesday. Lee's circulation is now embedded within the cold front, and is evolving into a classic mid-latitude wave cyclone. The entire system is lifting slowly toward the northeast.|
Here is a more detailed, regional (mesoscale) surface analysis of ex-Lee. Early this afternoon, the storm center was located over the Smoky Mountains. The pressure gradient is fairly weak, so widespread strong winds are not a concern. Note several spiral rain bands sweeping over the Carolinas and southeastern Virginia. Also note how the isobars (solid black lines) dip southward across Virginia. This pattern is suggestive of Appalachian cold air damming. In cold air damming, low-level winds get channeled from the northeast, from the cool North Atlantic, down the Virginia Piedmont. This cool dome of surface air, trapped up against the Appalachians, is one reason why temperatures are struggling to climb out of the mid-60's today.
|Detailed analysis of ex-Lee centered over Ashville, N.C. Note the spiral rain bands on the storm's eastern side, some of which may be producing tornadoes.|
|HPC prediction of 5-day total rain accumulation.|