Meandering 'cutoff low' to bring drenching rains to Southeast or Mid-Atlantic.
'It’s the second unusual stuck area of low pressure to develop in a month’s time.
An atypical area of low pressure is likely to settle over the East Coast for the second time in a month, brining cloudy, cool and unsettled weather, and potentially setting the stage for a swath of significant rainfall somewhere east of the Appalachians in the Southeast or Mid-Atlantic.
This low pressure area will be stranded, cast off from the main steering currents of the jet stream like a boat adrift in the doldrums. The jet stream, a high altitude highway of fast-moving air, will instead reside well to the north of the cutoff low.
Such weather features can lead to extreme precipitation totals, though the specific details of where the heaviest rain will fall is often unclear well in advance.
For example, a similar weather pattern dropped up to a foot of rainfall over portions of the Carolina Piedmont in mid-to-late May, with one-day totals eclipsing seven inches in Polk County, N.C.
Now, a similar system with the potential to bring renewed heavy rains and flash flooding could set up across the same region, though it is uncertain where the axis of heaviest moisture will align.
The same upper-air disturbance could also spark severe weather concerns for some, since cutoff lows are known for occasionally producing isolated severe thunderstorms and tornadoes. The multiple-day stretch of cloud cover, rain and storminess will also knock temperatures back to below seasonable norms.
“Never trust a cutoff low”'>>>
https://www.washingtonpost.com/weather/2020/06/12/meandering-cutoff-low-bring-drenching-rains-southeast-or-mid-atlantic/?
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