![]() ![]() (2003) found that bow echoes 1 account for nearly one-third of the convectively generated severe wind reports over the northern High Plains of the United States. Finally, the supercell-to-bow-echo evolution was most common across the northern plains, but the data sample is too small for this result to be considered significant. Bow-echo life spans were also longest, on average, over the southern plains however, the modal life span was longest over the eastern United States. Conversely, bow echoes typically developed from a group of weakly organized storms over the central United States. ![]() The observed bow-echo evolutions demonstrated considerable regional variability, with squall line-to-bow-echo transitions most frequent over the eastern United States. Similarly, it was found that bow echoes formed near, and moved generally along, synoptic-scale or mesoscale boundaries in about half of the cases (where data were available). Thunderstorm mergers were associated with the formation of bow echoes 50%–55% of the time, with the development of the bow echo proceeding quite rapidly after the merger in these cases. Forty-five percent of the observed bow echoes evolved from weakly organized cells, 40% from squall lines, while 15% of the bow echoes were observed to evolve from supercells. It was found that bow echoes develop from the following three primary initial modes: (i) weakly organized (initially noninteracting) cells, (ii) squall lines, and (iii) supercells. This would keep the risk of heavy snow further inland through the Appalachian Mountains and into Maine.The evolution of 273 bow echoes that occurred over the United States from 1996 to 2002 was examined, especially with regard to the radar reflectivity characteristics during the prebowing stage. If the system takes a more coastal track, it will pull mild ocean air into coastal cities producing more rain and less snow. The biggest question mark remains where the rain/snow line will set up. By Sunday night, conditions will likely be clear for Washington, D.C., and Philadelphia, while New York City Hartford, Connecticut Providence, Rhode Island and Portland, Maine, could still experience wind, rain, sleet and snow. On Sunday, the storm races northeast, but will continue to produce snow, rain and wind for much of New England. As a mix of rain, snow and sleet expands across the mid-Atlantic, the Appalachians and into the Northeast throughout the day, travel will become increasingly hazardous. Currently, the greatest snow chance lies north and west of the Interstate 95 corridor, with a better chance for all snow over parts of Interstates 81, 80 and 78. On Saturday, the storm is forecast to turn north, bringing widespread rain across the Eastern Seaboard while breaking out some inland snow. ![]() There is an isolated chance of strong thunderstorms capable of producing damaging winds, but heavy rain will be the biggest threat to the Gulf Coast states. Widespread heavy rain across the Gulf Coast could lead to instances of flooding as this system continues east. Heading into Friday, this system will strengthen as it dips south in its track. Showers and nonsevere thunderstorms will fire up in the evening hours across western Texas, bringing brief downpours and a few rumbles of thunder. Thursday, the storm will produce heavy snow for the southern Rockies early in the day, before pushing south and east into the southern Plains by the afternoon. The highest snowfall totals are expected to be across the highest elevations in Nevada, Utah and the northern parts of Arizona. While the East Coast waits for what is shaping up to be an impactful storm, those out west are already feeling the system's impacts.Īfter bringing rain, mountain snow and high surf conditions to the Pacific Coast region Tuesday, the storm system will move inland Wednesday, producing rain and snow spanning the Great Basin and the Southwest. ![]()
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