7:00 AM | Active weather pattern with some rain today, again at end of work week, and again early next week

7:00 AM | Active weather pattern with some rain today, again at end of work week, and again early next week

Low pressure will head from the Great Lakes region today to the Northeast US coastline and it will generate some shower activity for the region.  Showers can continue on Wednesday as well, but Thursday should be on the dry side.  Another system is likely to produce some rain around here Friday afternoon and evening and the weekend will remain on the unsettled side as high pressure to our north tries to take control.  There is the chance for a significant rain event during the early part of next week.

7:00 AM | Active pattern with some rain today, again at end of work week, and again early next week

7:00 AM | Active pattern with some rain today, again at end of work week, and again early next week

Low pressure will head from the Great Lakes region today to the Northeast US coastline and it will generate some rainfall for the region.  Showers can continue on Wednesday as well, but Thursday should be on the dry side.  Another system is likely to produce some rain around here later Friday and Friday night and the weekend will remain a little bit on the unsettled side as high pressure to our north tries to take control.  There is the chance for a significant rain event during the early part of next week. 

7:00 AM | Active weather pattern with multiple shots at rain

7:00 AM | Active weather pattern with multiple shots at rain

Low pressure will head from the Great Lakes region today to the Northeast US coastline and it will generate some rainfall for the region.  Showers can continue on Wednesday morning as well, but Thursday should be on the dry side.  Another system is likely to produce some rain around here by Friday night and the weekend will remain a little bit on the unsettled side as high pressure to our north tries to take control.  There is the chance for a significant rain event during the early part of next week.

7:00 AM | A touch of freezing rain cannot be ruled out late tonight/early tomorrow

7:00 AM | A touch of freezing rain cannot be ruled out late tonight/early tomorrow

The week will start on the cold and frosty side, but a warm frontal passage on Tuesday will pave the way for somewhat milder conditions during the second half of the week. The frontal system will bring us some rain on Tuesday and the rain can initially freeze on some untreated surfaces across the northern and western suburbs in the period from late tonight into early tomorrow.  Another system could bring us more rain shower activity later Friday while temperatures remain relatively mild.

7:00 AM | Periods of rain on Tuesday as milder air pushes into the area

7:00 AM | Periods of rain on Tuesday as milder air pushes into the area

The week will start on the chilly side, but a warm frontal passage on Tuesday will pave the way for somewhat milder conditions during the second half of the week. There is the chance for some rain on Tuesday as the frontal system works its way through the region. High pressure will settle over the area later in the week and it’ll stay primarily on the dry side unti late Friday when showers can return from our southwest.

9:30 AM | *Some afternoon snow and sleet in eastern PA, interior NJ, NYC metro region*

9:30 AM | *Some afternoon snow and sleet in eastern PA, interior NJ, NYC metro region*

Temperatures are starting the day generally below freezing in the Philly and NYC metro regions and they won’t climb much at all today as low-level Arctic air is now firmly entrenched in the area. Precipitation should arrive in these metro regions somewhere around the noon or 1pm time frame moving from southwest-to-northeast and it should continue on and off into the evening; primarily, as a mix of snow and sleet.  Freezing rain can mix in at times; especially, late in the day and during the evening, but snow and sleet should dominate for much of the afternoon.  Anywhere from a coating to an inch snow is possible this afternoon and evening across eastern PA, interior NJ, and the NYC metro region. There can also be a touch of icing left on the ground and also on untreated surfaces. Travel conditions can get slippery this afternoon and evening on any untreated road surfaces and bridges.  The precipitation winds down during the late evening hours.  

8:50 AM | *Two waves of precipitation today/tonight in the DC metro region*

8:50 AM | *Two waves of precipitation today/tonight in the DC metro region*

An initial burst of precipitation this morning will produce sleet in parts of the DC metro region; especially, across northern sections, as low-level temperatures have resulted in a corridor favoring this form of precipitation.  Other areas will see some light rain that can freeze on untreated surfaces over the next few hours; especially, in higher elevation locations.  The precipitation will then tend to slacken off or even stop completely during the mid-day and early afternoon hours and then should resume during the mid-to-late afternoon hours.  By that time, the precipitation should fall mainly as liquid; however, there still can be some freezing on untreated surfaces; especially, across the northern and western suburbs of the metro region. 

3:25 PM | *Icing problems on Saturday for the DC metro region*

3:25 PM | *Icing problems on Saturday for the DC metro region*

Temperatures have held near 50 degrees this afternoon following the passage of a cold frontal system and will drop noticeably after dark.  High pressure is building southward and pushing drier and colder air into the low-levels of the atmosphere.  Meanwhile, low pressure in the Tennessee Valley is drawing warmer into the upper parts of the atmosphere.  Moisture is advancing rapidly in a west-to-east fashion across the Ohio Valley and should arrive in the DC metro region after midnight.  As temperatures drop to near freezing, the precipitation is likely to arrive as a brief period of snow and then sleet and freezing rain.  On Saturday, as temperatures hover near the freezing mark, freezing rain is liable to be the main precipitation type although sleet can mix in at times and a light glaze of ice is likely to form on untreated road surfaces trees and bushes.  Travel conditions could get slippery on any untreated road surface.  The precipitation should lighten up tomorrow night, but there can still be some residual freezing rain possibly mixed with sleet and temperatures will hold near freezing.

2:45 PM | *”January thaw” to give time for the atmosphere to reload…signs point to a return of cold weather after several warm days*

2:45 PM | *”January thaw” to give time for the atmosphere to reload…signs point to a return of cold weather after several warm days*

It is not uncommon for a “break in the action” to occur in the northeast US during a given winter season.  In fact, this extended period of warmer-than-normal weather often takes place right in the heart of the winter season during the middle or latter part of January and has become known as the “January thaw”.  It looks like we are indeed in store this year for a “January thaw” with warmer-than-normal weather beginning around the middle of next week and lasting for perhaps a week or so.  Beyond that, however, there are numerous signs (high-latitude blocking, MJO, stratospheric warming) that point to a return of a cold weather pattern for the northeast US – one that could last well into February.