Monday 10 AM
From the first sunbeam sparkling through the morning dew to the last glimmer of northwest blue at evening dusk, this is a hot summer day from the Great Lakes on east. In some areas puffy cumulus will probe for expressways to the stratosphere, but in most cases dry air will cut their climb before any menace is realized. However, in a corridor from the northern Plains to the Upper Great Lakes, there will be rounds of showers and thunderstorms.
As for the heat and humidity in the Northeast, these are the visitors we longed for during winter's bitter blusters from snow-topped, ice-encapsulated tundra that froze our faces, whipped through the cityscape canyons, and twisted the brittle leafless branches of our wintry world (well, at least it's that way for a while in most winters). But when when these hot and humid visitors they actually get here, they can outlive their welcome.
Sure, the morning temperature faithfully representing July was bearable, but the afternoon edges into blistering heat we get from air masses that are fugitives from the desert. We face furnace fires of grandiose grilling, the super-searing, intensely igneous, fiercely firing and flaring, brazenly broiling heat that takes us to the pinnacle of perspiration, the summit of sweat and a surfeit of sultriness that is certainly sweltering. Every so often an unseen breeze will ruffle the leaves and blow warm puffs in our faces; mostly it is calm and still. Summer haze muffles the sharp skyline.
This video suggests how weather changes will proceed this week.
We usually associate hot weather with southwest winds. However, if hot air moves far to the north, then any flow from that area will still be hot. This map shows isobars (line of equal barometric pressure) tracing out a southwesterly flow in the Midwest but a northwesterly flow in the Northeast.
The steering winds aloft are changing, and the next phase looks like it will feature a northwesterly flow of cooler air this weekend and much of next week.
It's going to be hot hazy and humid in the much of the Northeast today through Thursday. The recalescent, sudorific, canicular, pyrogenic frying heat gains our attention.
A line of persistent showers and thunderstorms stretched from Long Island Sound to Cape Cod. Some areas in this zone had more than 3 inches of rain this morning, and there can be highway flooding in localized heavy showers this afternoon and evening. This radar shows the rain zone just after 10 a.m. ET.
This map shows the predicted upper-air flow for tomorrow night. Our timing estimates suggest showers and some thunderstorms could affect the I-95 corridor from Portland and Boston to New York City (and perhaps Philadelphia) on Sunday.
For the start of this "Olympics of the Forest," the weather looks good, as forest we can tell. From DC to NYC, it looks sunny for at least the next two, tree days.
As moisture from former hurricane Delores moved northward, the dynamic changed, and thunderstorms broke out. This map shows the more than 300,000 strokes that occurred between early yesterday and early today.