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    Severe Storms, Flooding Rain Hover Over East

    By Andy Mussoline, AccuWeather.com Senior Meteorologist
    June 11, 2013; 11:10 AM ET
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    Play video The Northeast forecast is detailed in the above video.

    Rain through Monday evening is bringing flash flooding to some locations recently hit by Andrea. Gusty thunderstorms in some locations are capable of producing a couple of tornadoes.

    The National Weather Service confirmed one around 7:00 p.m. EDT near Sykesville, Md., 12 miles northeast of Damascus.

    Washington, D.C., Baltimore and Philadelphia among a host of other cities continue to be threatened by both flash flooding and severe storms in the mid-Atlantic. Locally severe thunderstorms are impacting the southern cities of Columbia, Augusta, Charlotte and Raleigh. In New England, cities such as Hartford, Conn., Providence, R.I., and Boston will also be threatened by flash flooding.

    A secondary area of severe thunderstorms, including a few tornadoes was pushed eastward across southern Kentucky and middle and eastern Tennessee.

    Flooding Risk

    Flooding on roadways could be common in the region, particularly in urban areas during through the evening.

    Enough rain could fall to bring small streams out of their banks, potentially flooding secondary roadways, as well as homes and businesses nearby.

    Any travelers that encounter water-covered roadways are urged to stop and turn around. Residents in low-lying areas near small streams should be especially vigilant as these downpours cross the region.

    Andrea shattered June rainfall records late last week across the mid-Atlantic and southern New England.

    Coastal areas of the Northeast region are now especially vulnerable to flooding Monday as a non-tropical system spreads showers and thunderstorms on top of recent rains by Andrea.

    Andrea in Photos
    Midweek Severe Storm Risk Includes Possible Derecho
    Northeast Regional Radar

    The heaviest rain will reach into northern New England and northern upstate New York Monday night and will continue into Tuesday.

    Less-intense rainfall with spotty showers are in store for the mid-Atlantic on Tuesday.

    Severe Thunderstorms

    Enough warm and humid air is being drawn into the region Monday is causing locally damaging thunderstorms through the evening over part of the mid-Atlantic and the Carolinas.

    Thunderstorms from central Pennsylvania to part of New Jersey, southward to central South Carolina can bring frequent lightning strikes, high wind gusts and hail. A couple of the strongest storms from near the Mason-Dixon Line southward to the Carolinas could produce a brief tornado as well.

    A few neighborhoods could be hit with downed trees and power outages as a result of the storms.

    A disturbance was also setting off severe thunderstorms from portions of Kentucky to Tennessee. These storms pose the full spectrum risk for severe weather including tornadoes into Monday evening, before diminishing over the southern Appalachians as gusty downpours Monday night.

    Another bout of thunderstorms with the potential for damaging winds and flooding will roll in from the Midwest later in the week. There is a possibility that parts of the Ohio Valley, central Appalachians and mid-Atlantic are hit by a very strong complex of thunderstorms Wednesday into Thursday. These complexes are referred to as Mesoscale Convective Complexes (MCCs) or Mesoscale Convective Systems (MCSs). The most severe, and longest lasting form of which is called a derecho.

    AccuWeather.com meteorologists will continue to monitor the situation very closely and will pass along new information as it is available.

    There is a risk of flooding downpours and locally severe storms for the opening round of the U.S. Open Thursday at Ardmore, Pa.

    This story was updated as of 9:40 p.m. EDT Monday, June 10.

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