* WHAT. Very cold wind chills as low as 8 below expected. * WHERE. Portions of DC, central, northeast, and northern Maryland, and northern and northwest Virginia. * WHEN. From 8 PM Friday to 10 AM EST Saturday. * IMPACTS. The cold wind chills of zero to 8 below zero could result in hypothermia if precautions are not taken.

* WHAT. Very cold wind chills of 10 to 15 below expected. * WHERE. Portions of north central and western Maryland, northwest Virginia, and eastern and panhandle West Virginia. * WHEN. From 8 PM Friday to 10 AM EST Saturday. * IMPACTS. The dangerously cold wind chills as low as 15 below zero could cause frostbite on exposed skin in as little as 30 minutes.

* WHAT. For the first Small Craft Advisory, west winds 10 to 15 kt with gusts up to 20 kt. For the second Small Craft Advisory, northwest winds 15 to 25 kt with gusts up to 30 kt expected. * WHERE. Tidal Potomac River from Key Bridge to Cobb Island MD. * WHEN. For the first Small Craft Advisory, until 4 PM EST this afternoon. For the second Small Craft Advisory, from noon Friday to 6 AM EST Saturday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. Very cold wind chills of zero to 10 below expected. * WHERE. Portions of DC, central, northeast, and northern Maryland, and northern and northwest Virginia. * WHEN. From 8 PM Friday to 10 AM EST Saturday. * IMPACTS. The cold wind chills as low as 10 below zero could result in hypothermia if precautions are not taken.

* WHAT. Very cold wind chills of 10 to 15 below expected. * WHERE. Portions of north central and western Maryland, northwest Virginia, and eastern and panhandle West Virginia. * WHEN. From 8 PM Friday to 10 AM EST Saturday. * IMPACTS. The cold wind chills as low as 15 below zero could result in hypothermia if precautions are not taken.

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.

* WHAT. For the first Small Craft Advisory, west winds 5 to 10 kt with gusts up to 20 kt. For the second Small Craft Advisory, northwest winds 15 to 25 kt expected. * WHERE. Tidal Potomac River from Key Bridge to Cobb Island MD. * WHEN. For the first Small Craft Advisory, until 4 PM EST this afternoon. For the second Small Craft Advisory, from noon Friday to 6 AM EST Saturday. * IMPACTS. Conditions will be hazardous to small craft.

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.

* WHAT. For the first Small Craft Advisory, south to southwest winds around 10 kt with gusts up to 20 kt, becoming northwest this afternoon. For the second Small Craft Advisory, northwest winds 15 to 20 kt with gusts up to 25 kt. * WHERE. Tidal Potomac River from Key Bridge to Cobb Island MD. * WHEN. For the first Small Craft Advisory, until 4 PM EST this afternoon. For the second Small Craft Advisory, from noon Friday to 6 AM EST Saturday. * IMPACTS. Conditions will be hazardous to small craft.