7:00 AM | Significant storm threat continues for mid-week; greatest threat for significant snowfall is just to the south and west of Philly, but it is still a close call

6-Day Forecast

Today

Partly sunny, breezy, cold, highs in the low 40’s

Tonight

Partly cloudy, cold, lows in the mid 20’s

Tuesday

Sun early, clouds late, breezy, chilly, low-to-mid 40’s

Tuesday Night

Becoming mostly cloudy, cold, chance for rain or snow late, low 30’s

Wednesday

Cloudy, snow likely, mixed with rain at times, accumulations possible, cold, near 40

Thursday

Becoming partly sunny, windy, chilly, low-to-mid 40’s

Friday

Mostly sunny, chilly, mid-to-upper 40's

Saturday

Partly sunny, milder, near 50

Discussion

A major storm will affect the Mid-Atlantic region from late Tuesday through Wednesday and while some questions have been answered, some still remain with this unfolding complex situation. Low pressure will drop southeastward today across the Plains and should reach the North Carolina/Virginia border region by Wednesday. Significant total precipitation amounts are likely from this storm across portions of West Virginia, Virginia, the DC metro region and the Delmarva Peninsula. Whether the heaviest precipitation amounts makes it into southeastern PA is still an open question as it appears that we are on the northern fringes at the moment with only light-to-moderate amounts possible, but significant effects from this storm around here are still on the table. The greatest chance for substantial snowfall from this storm with the current thinking will be in the higher elevations across eastern West Virginia, western Virginia, western Maryland, and even into the DC metro region; especially, in its western suburbs. Temperatures will be border line between rain and snow during the storm so it is very likely not an all-snow event. The storm pulls away later Thursday and high pressure takes over at the end of the week. One final note of interest, the coldest temperature on the planet this morning is -77 F degrees in Summit Camp, Greenland - right where the extreme high pressure is located that we talked about late last week.

Video

httpv://youtu.be/JhyCD7lkaj8