Thunderstorms with potentially damaging winds will aim for New England Monday night.
Some of Karen's moisture will get drawn northward and enhance the rain accompanying a cold front spreading into the mid-Atlantic and Northeast. This is despite Karen weakening into a tropical rainstorm in the northern Gulf this past weekend due to dry air and disruptive winds above the surface of the water.
"One to 3 inches of rain will occur near and along the front as it works eastward across the eastern United States," AccuWeather Expert Senior Meteorologist Dan Kottlowski said.
There is also the risk of a couple of brief, spin-up tornadoes into Monday evening. These could be concealed by drenching rain in some cases right along the mid-Atlantic coast and over New England.
As of Monday evening, gusty winds from some of the storms downed multiple trees and power lines in Claremont, N.H., according to law enforcement reports. Law enforcement even reported that some towns, like Whitefield, N.H., lost power due to the storms.
This cold front produced some drenching rain and gusty thunderstorms from Michigan to central Tennessee and Mississippi on Sunday.
The rain moved from near lakes Huron and Erie to the eastern Tennessee Valley and southern spine of the Appalachians on Sunday night before pushing across the mid-Atlantic and Northeast for Monday and Monday night.
Many places will receive around an inch of rain in a span of six hours or less. There will be locally higher amounts, and that is where AccuWeather.com meteorologists will be most concerned for flash flooding to occur.
Urban areas will be most susceptible to flash flooding problems.
Even where flooding does not occur, the downpours threaten to slow motorists down by reducing visibility and heightening the concern of vehicles hydroplaning at highway speeds.
Fallen leaves could worsen the situation by clogging storm drains and making roads slippery, while some of the heaviest downpours will be accompanied by a burst of strong winds that could lead to minor tree damage and sporadic power outages.
Airline passengers could face flight delays as those with outdoor plans may be forced inside for a time.
Prolonged gusty winds will whip the coastline of the mid-Atlantic and New England Monday night ahead of the rain. Rough seas will pose dangers to small craft.
There is good news to the upcoming soaking. The rain will be beneficial to those places that had September end and October start on a dry note.
The storms will cut back at the unusual warmth from Philadelphia and Washington, D.C., on southward. In these cities, temperatures have been as much as 10-20 degrees above normal since the start of October. Following the early week storms, high temperatures will be closer to normal in the upper 60s and low 70s.
The risk of drenching and locally gusty thunderstorms will expand northwestward over the balance of the week, reaching parts of Southern California, Arizona and Nevada.
A cold front swinging across the northeastern United States will bring the threat of heavy, drenching thunderstorms Thursday afternoon.
A cold front will press southward bringing relief from the heat to Spain, Italy and southeast Europe late this week.
Flooding monsoon rain will continue this week in India and southeast Pakistan, but a drier pattern is expected to set in during August.
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