* WHAT. Abnormally low water levels. * WHERE. Tidal Potomac from Key Bridge to Indian Head MD. * WHEN. Until 9 PM EST this evening. * IMPACTS. Below normal water levels will result in hazardous navigating conditions.

* WHAT. Abnormally low water levels expected. * WHERE. Tidal Potomac from Key Bridge to Indian Head MD. * WHEN. Until 7 PM EST this evening. * IMPACTS. Below normal water levels will result in hazardous navigating conditions.

MAJOR WINTER STORM WILL IMPACT THE REGION THIS EVENING THROUGH SUNDAY EVENING. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will lead to widespread significant snow beginning this evening, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected tonight through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 6 and 10 inches, with up to 14 inches possible, especially in the far northern and western suburbs of Washington and Baltimore. Ice accumulations between one and two tenths of an inch. * WHERE. DC, portions of central, northeast, and northern Maryland, and northern Virginia. * WHEN. From 11 PM this evening to 4 AM EST Monday. * IMPACTS. Power outages and tree damage are likely due to the ice. Travel could be nearly impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS. Snow will likely overspread the area tonight, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period of wind chills in the single digits and teens continues this evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM WILL IMPACT THE REGION THIS EVENING THROUGH SUNDAY EVENING. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will lead to widespread significant snow beginning this evening, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected tonight through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 9 and 13 inches, with up to 16 inches possible in western Maryland. Ice accumulations up to a tenth of an inch, mainly across the northern Shenandoah Valley. * WHERE. Portions of north central and western Maryland, northern and northwest Virginia, and eastern and panhandle West Virginia. * WHEN. From 11 PM this evening to 4 AM EST Monday. * IMPACTS. Travel could be very difficult to impossible. * ADDITIONAL DETAILS. Snow will likely overspread the area tonight, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Visibility of one-quarter mile or less is possible at times. A prolonged period of very cold wind chills continues this evening and lasting through the middle of next week.

MAJOR WINTER STORM WILL IMPACT THE REGION THIS EVENING THROUGH SUNDAY EVENING. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will lead to widespread significant snow beginning this evening, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected tonight through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 7 and 14 inches, with highest in the far northern and western suburbs of Washington and Baltimore. Ice accumulations between one and two tenths of an inch. * WHERE. Portions of DC, central, northeast, and northern Maryland, and northern Virginia. * WHEN. From 11 PM this evening to 4 AM EST Monday. * IMPACTS. Power outages and tree damage are likely due to the ice. Travel could be nearly impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS. Snow will likely overspread the area tonight, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period of wind chills in the teens and single digits continues this evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM WILL IMPACT THE REGION THIS EVENING THROUGH SUNDAY EVENING. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will lead to widespread significant snow beginning this evening, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected tonight through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 10 and 16 inches, with highest amounts north and west of US-340. Ice accumulations up to two tenths of an inch, mainly south and east of US-340. * WHERE. Portions of north central and western Maryland, northern and northwest Virginia, and eastern and panhandle West Virginia. * WHEN. From 11 PM this evening to 4 AM EST Monday. * IMPACTS. Travel could be very difficult to impossible. * ADDITIONAL DETAILS. Snow will likely overspread the area tonight, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Visibility of one-quarter mile or less is possible at times. A prolonged period of very cold wind chills continues this evening and lasting through the middle of next week.

MAJOR WINTER STORM WILL IMPACT THE REGION SATURDAY EVENING THROUGH SUNDAY EVENING. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will lead to widespread significant snow beginning Saturday evening, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected tonight through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 7 and 14 inches, with highest in the far northern and western suburbs of Washington and Baltimore. Ice accumulations between one and two tenths of an inch. * WHERE. Portions of DC, central, northeast, and northern Maryland, and northern Virginia. * WHEN. From 11 PM Saturday to 4 AM EST Monday. * IMPACTS. Power outages and tree damage are likely due to the ice. Travel could be nearly impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS. Snow will likely overspread the area Saturday night, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period of wind chills in the teens and single digits is likely beginning this evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM WILL IMPACT THE REGION SATURDAY EVENING THROUGH SUNDAY EVENING. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will lead to widespread significant snow beginning Saturday evening, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected tonight through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 10 and 16 inches, with highest amounts north and west of US-340. Ice accumulations up to two tenths of an inch, mainly south and east of US-340. * WHERE. Portions of north central and western Maryland, northern and northwest Virginia, and eastern and panhandle West Virginia. * WHEN. From 11 PM Saturday to 4 AM EST Monday. * IMPACTS. Travel could be very difficult to impossible. * ADDITIONAL DETAILS. Snow will likely overspread the area Saturday night, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Visibility of one-quarter mile or less is possible at times. A prolonged period of very cold wind chills is likely beginning this evening and lasting through the middle of next week.

* WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 7 and 14 inches, with highest in the far northern and western suburbs of Washington and Baltimore. Ice accumulations between one and two tenths of an inch. * WHERE. Portions of DC, central, northeast, and northern Maryland, and northern Virginia. * WHEN. From 11 PM Saturday to 4 AM EST Monday. * IMPACTS. Power outages and tree damage are likely due to the ice. Travel could be nearly impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS. Snow will likely overspread the area Saturday night, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning this evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

* WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 8 and 14 inches, with the highest amounts closer to the Blue Ridge and along the Maryland and Pennsylvania border. Ice accumulations between one tenth and two tenths of an inch, especially south and east of the US-28 and US-15 corridors. * WHERE. Portions of central and northern Maryland and northern Virginia. * WHEN. From 11 PM Saturday to 4 AM EST Monday. * IMPACTS. Travel could be very difficult to impossible. * ADDITIONAL DETAILS. Snow will likely overspread the area by Saturday evening, becoming heavy at times Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday, especially south of Interstate 70. Significant icing is possible especially across central Virginia. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning this evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

* WHAT. Heavy mixed precipitation expected. Total snow and sleet accumulations between 12 and 18 inches, with highest amounts north and west of US-340. Ice accumulations up to two tenths of an inch, mainly south and east of US-340. * WHERE. Portions of north central Maryland, northern and northwest Virginia, and eastern and panhandle West Virginia. * WHEN. From 11 PM Saturday to 4 AM EST Monday. * IMPACTS. Travel could be very difficult to impossible. * ADDITIONAL DETAILS. Snow will likely overspread the area Saturday night, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Visibility of one-quarter mile or less is possible at times. A prolonged period very cold wind chills is likely beginning Friday evening and lasting through the middle of next week.

MAJOR WINTER STORM EXPECTED THIS WEEKEND. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will likely lead to widespread significant snow beginning late Saturday, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected Friday night through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy snow mixed with sleet and freezing rain possible. There is a high likelihood of at least 5 inches of snow, with over 10 inches possible. Ice accumulation is also possible. * WHERE. Portions of DC, central, northeast, northern, and southern Maryland, and central and northern Virginia. * WHEN. From Saturday evening through Monday morning. * IMPACTS. Power outages and tree damage are likely due to the ice. Travel could be nearly impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS. Snow will likely overspread the area Saturday evening, becoming heavy at times late Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is possible Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning this evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM EXPECTED THIS WEEKEND. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will likely lead to widespread significant snow beginning late Saturday, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected Friday night through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy snow mixed with sleet and freezing rain possible. There is a high likelihood of at least 5 inches of snow, with over 10 inches possible. Ice accumulation is also possible, especially south of Interstate 70. * WHERE. Portions of central, north central, and northern Maryland, central, northern, northwest, and western Virginia, and eastern and panhandle West Virginia. * WHEN. From Saturday afternoon through late Sunday night. * IMPACTS. Travel could be very difficult to impossible. * ADDITIONAL DETAILS. Snow will likely overspread the area by Saturday evening, becoming heavy at times Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is possible Sunday, especially south of Interstate 70. Significant icing is possible especially across central Virginia. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning this evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM EXPECTED THIS WEEKEND. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will likely lead to widespread significant snow beginning late Saturday, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected Friday night through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy snow mixed with sleet and freezing rain possible. There is a high likelihood of at least 5 inches of snow, with over 10 inches possible. Ice accumulation is also possible. * WHERE. Portions of DC, central, northeast, northern, and southern Maryland, and central and northern Virginia. * WHEN. From Saturday evening through Monday morning. * IMPACTS. Travel could be very difficult to impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS. Snow will likely overspread the area Saturday evening, becoming heavy at times late Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is possible Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning Friday evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM EXPECTED THIS WEEKEND. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will likely lead to widespread significant snow beginning late Saturday, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected Friday night through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy snow mixed with sleet and freezing rain possible. There is a high likelihood of at least 5 inches of snow, with over 10 inches possible. Ice accumulation is also possible, especially south of Interstate 70. * WHERE. Portions of central, north central, and northern Maryland, central, northern, northwest, and western Virginia, and eastern and panhandle West Virginia. * WHEN. From Saturday afternoon through late Sunday night. * IMPACTS. Travel could be very difficult to impossible. * ADDITIONAL DETAILS. Snow will likely overspread the area by Saturday evening, becoming heavy at times Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is possible Sunday, especially south of Interstate 70. Significant icing is possible especially across central Virginia. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning Friday evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM POSSIBLE THIS WEEKEND. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will likely lead to widespread significant snow beginning late Saturday, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected Friday night through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy snow mixed with sleet and freezing rain possible. There is a high likelihood of at least 5 inches of snow, with over 10 inches possible. Ice accumulation is also possible. * WHERE. Portions of DC, central, northeast, northern, and southern Maryland, and central and northern Virginia. * WHEN. From Saturday evening through Monday morning. * IMPACTS. Travel could be very difficult. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS. Snow will likely overspread the area Saturday evening, becoming heavy at times late Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is possible Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning Friday evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM POSSIBLE THIS WEEKEND. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will likely lead to widespread significant snow beginning late Saturday, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected Friday night through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy snow mixed with sleet and freezing rain possible. There is a high likelihood of at least 5 inches of snow, with over 10 inches possible. Ice accumulation is also possible, especially south of Interstate 70. * WHERE. Portions of central, north central, and northern Maryland, central, northern, northwest, and western Virginia, and eastern and panhandle West Virginia. * WHEN. From Saturday afternoon through late Sunday night. * IMPACTS. Travel could be very difficult. * ADDITIONAL DETAILS. Snow will likely overspread the area by Saturday evening, becoming heavy at times Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is possible Sunday, especially south of Interstate 70. Significant icing is possible especially across central Virginia. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning Friday evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM POSSIBLE THIS WEEKEND. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will likely lead to widespread significant snow beginning late Saturday, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected Friday night through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy snow mixed with sleet and freezing rain possible. There is a high likelihood of at least 5 inches of snow, with over 10 inches possible. Ice accumulation is also possible. * WHERE. DC, and portions of central, northeast, northern, and southern Maryland, and central and northern Virginia. * WHEN. From Saturday evening through Monday morning. * IMPACTS. Travel could be very difficult. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS. Snow will likely overspread the area Saturday evening, becoming heavy at times late Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is possible Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning Friday evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

MAJOR WINTER STORM POSSIBLE THIS WEEKEND. .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will likely lead to widespread significant snow beginning late Saturday, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected Friday night through the middle of next week with sub-zero wind chills likely at times. * WHAT. Heavy snow mixed with sleet and freezing rain possible. There is a high likelihood of at least 5 inches of snow, with over 10 inches possible. Ice accumulation is also possible, especially south of Interstate 70. * WHERE. Portions of central, north-central, and northern Maryland, central, northern, northwest, and western Virginia, and eastern West Virginia. * WHEN. From Saturday afternoon through late Sunday night. * IMPACTS. Travel could be very difficult. * ADDITIONAL DETAILS. Snow will likely overspread the area by Saturday evening, becoming heavy at times Saturday night with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is possible Sunday, especially south of Interstate 70. Significant icing is possible especially across central Virginia. Visibility of one-quarter mile or less is possible at times. A prolonged period wind chills in the teens and single digits is likely beginning Friday evening and lasting through the middle of next week, with sub-zero wind chills possible at times.