Another comfortable mid-summer air mass is destined to invade the Garden State this week. This arrives on the heels of several other mild, dry air masses that have contributed to making this a rather average July in the temperature department. While many may think that this has been an exceptionally cool summer, it has not. However, given that the most recent four Julys all ranked within the top six for heat dating all the way back to 1895, all are forgiven for any misperception!
The overall pattern that has led to temperatures more often being on the cool than than warm side of the ledger since last fall is one of pronounced waviness in the jet stream, with a resultant tendency for a ridge (northward swing) in western North America and a trough (dip in the jet) in the east. This allows cool and dry air to infiltrate our region, with warm and humid air kept at bay to the south. It has also kept the west in severe drought and plenty warm.