From the Great Lakes through the Northeast, the week ahead should feature the typical ups and downs of midspring. In Chicago, the temperature should break past 70 today, fail to get past the 50s tomorrow and Wednesday, then reach the 60s on Thursday and Friday. In Philadelphia, high temperatures of 70 or higher are likely today, tomorrow and again on Friday, then readings will not much above the 60s on Wednesday and Thursday. The video has more.
This satellite picture shows the storm that affected the Southeast on Saturday (1) , the frontal system that will reach the East Coast late tomorrow night (2) and a disturbance in the Pacific Northwest that may affect the Northeast at the end of the week (3).
This year, the "slight" category has been divided in two: slight and enhanced. When seen together on an SPC map, the progression makes sense. When the term "enhanced" is used alone, it can be a challenge, at least until we get used to it.
This map shows the pressure analysis and locations of fronts and low pressure areas at 9 a.m. EDT today. Places from Philadelphia northeastward will only warm up if and when the warm front in Delaware passes any given spot. Chill air follows the front in Indiana.
This map shows the GFS forecast for Monday at 2 p.m. ET. If correct, rain will hold off for the Boston Marathon. However, you can see that any speedup of the rain would prove that idea to be wrong.
Another high pressure area will build over the Northeast during the weekend, so sunshine with mild afternoons can be expected. However, this forecast map for next Monday evening shows how extensive and wide ranging the next storm may be.
These maps show how the US model handles the disturbance now causing rain in Tennessee. On the 1st map (for tomorrow), it is embedded in a southwesterly flow. However the 2nd map (for late tomorrow night) shows it turning more toward the course that would take it out to sea.
In the middle of Pennsylvania, rain ended before daybreak, but rolls of sullen clouds presided during the first hours of daylight. A robin takes in the scene.