For those who love warm weather in March, this year may be one of those occasions when you're smiling frequently. After the cool chill of the past three days, high pressure will reward everyone with a two day taste of Spring starting tomorrow afternoon. As the high nudges off the coast, milder southwest breezes will take over across the Mid Atlantic, helping boost temperatures quickly tomorrow to the lower 60's in many locations. This high is almost in an optimal position for big time warming -- southeast (or east-southeast) of us, with a nice southwest trajectory of wind at the surface and also aloft. Those two factors will combine to give us another Spring Fling in the Delaware Valley in a cold season that has featured plenty.
If the cloud cover issue does rear its head Wednesday night and Thursday morning, temperatures probably don't get to 70 in Philadelphia but instead "only" get into the mid and upper 60's, which is where computer guidance has us for Thursday (they do account for some lower clouds developing). Still rather nice -- still significantly above average for this time of the year -- just not that seventy degree reading some of the warm mongers are drooling for. We'll need a bit of a goldilocks outcome to get there -- near full sunshine and a minimum of cloud cover. If we can get those, 70 may just happen.