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 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.
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.
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.
Following a blustery and chilly weekend, temperatures will once again take a tumble across the northeastern United States during the first half of this week.
Several storms will bring periods of rain and gusty winds to the west coast of the United States this week, and Southern California will not be excluded from rainfall this time.
A strengthening tropical cyclone will unleash heavy rain and strong winds on areas from western Myanmar to northeast India and Bangladesh this week.
Flooding downpours and thunderstorms will target a part of the central United States at midweek.
Dry weather set to dominate the southern United States into November will only worsen the already extreme drought conditions.
The changing of the seasons will bring beneficial rainfall to northern Brazil, a region that has experienced severe drought over the past several years.
Newbury, VT (1843)
12 inches of snow.
East Coast, USA (1878)
"Gale of '78;" hurricane center over Richmond, VA. Washington, DC. barometer reading of 28.78"/975 mb. Cape May had winds of 84 mph from the SE. Highest tide ever for the Delaware River. Winds 100 mph at Wilmington, DE. Severe damage in Philadelphia.
Off British Columbia Coast (1918)
The Princess Sophia struck a coastal reef in severe storm and sank. All 343 aboard drowned.