Wednesday 10:45 a.m.
On Monday, it warmed to the 60s. Yesterday it stayed in the 40s as soaking rain approached. Now there are prospects for accumulating snow and treacherous travel conditions for large portions of Virginia and the southern and central parts of Maryland and Delaware.
Two weather makers are poised to threaten the first major snow of the season for DC: a low pressure area moving northeastward from the Gulf of Mexico, and a cold high pressure area that sends cold air south from New York state and New England. This video shows how the storm and high pressure area may progress. It is based on last night's 1 a.m. GFS run. Newer models this morning showed some snow getting all the way up to the New York City and Boston areas later tomorrow night!
Meanwhile, the storm that caused mainly rain from DC to NYC last night had enough cold air with it to create miserable driving conditions from Philadelphia's far northern suburbs to much of the New York City region this morning as rain, freezing rain and sleet dominated the morning commute.
After a temporary warmup this weekend, bitterly cold air from the remote frozen hinterlands of the Arctic will pour south to give the Great Lakes and Northeast their coldest weather so far this season. This map shows the flow aloft forecast for next Monday night. It is easy to see why cold air is on the way.
There is a slight risk for severe thunderstorms later today from north-central Tennessee up across Indiana and Ohio to Michigan and eastern Wisconsin (shown by the "S" area on the map below. Thunderstorms are not predicted for areas near the coast from Delaware to New England.
It is not going to snow any time soon, but in any type of weather the flag is a symbol of freedom. This holiday weekend we celebrate the contributions of those who were there to defend the freedoms we enjoy in these times.
Once again, the rain will miss much of central and northern New England. The region has been in a dry spell, as evidenced by its appearance on this U.S Drought Monitor map.
A cold front crossed the Northeast yesterday. Looking at these maps, which show morning temperatures yesterday versus readings around the same time today, we can see that the biggest drop in temperatures occurred around the lower Great Lakes.
Much of eastern New England has been in a dry spell ever since the last snow melted. More dry weather is on the way from tomorrow through the end of the week. This radar image taken at mid-morning Tuesday is peppered with showers.
Cooling will also occur from Wisconsin into western Michigan as a cold front moves eastward. This map shows the arrangement of fronts and the area of relatively warm air between the two cool air masses: