Thursday, The Fourth of July 7 a.m.
These are dog days of summer. They were originally named for when the dog star Sirius rose about the same time as the sun. The astronomical connection no longer exists, and Sirius is a radio network, but the dog days have come to refer to the 40 or 50 days when it is likely to be hottest.
As we sniff out this afternoon's tail, a stray thunderstorm can occur almost anywhere ion the Northeast, but most of the packs of showers will be west and north of I81. However, thunderstorms can be terrierizing. Sometimes you think a storm has more bark than bite, and then all of a sudden a cloudburst of rain is unleashed and it rains cats and dogs. When this happens, don't step in a poodle.
The thunderstorms do cool it off a bit, but the air won't feel like it came by Labrador Retriever. Instead, humid air will hound us, and afternoon temperatures should reach well into the 80s to near 90 before the day fleas. While we are sounding the beagles for the possibility of thunderstorms, we should tick off many hours this weekend when sunshine gets a new leash on life.
Early next week It's the samoyed story of hot and humid, but if you think all of next week will be dry, you're probably barking up the wrong tree. When a thunderstorm does attack, however, pay heed to those pointers about moving to a safe place. Make no bones about it: thunderstorms can be ruff.
Sam the dog likes to stay indoors when it is hot, but he posed for this picture to celebrate the dog days.
There were numerous thunderstorms yesterday. This is the lightning stroke map covering the period from 8 ET yesterday morning to 7:30 ET this morning. Thunderstorms will be less numerous today, but any that do form can cause briefly strong and gusty winds.
One area of concern is Lake Erie, where unprepared boaters could suddenly be blasted by 60-mph winds. The National Weather Service Storm Prediction Center has outlined a large area where the threat of strong wind exists. The map is below today's forecast video.
Tomorrow, a cold front will cross the Great Lakes, then reach the Northeast by the end of Wednesday. Today, a southwesterly current of very warm air is evident on the surface pressure map.
The center of Arthur (shown here at noon ET) should pass less than 50 miles southeast of Nantucket this evening, causing heavy rain and gusty winds across much of eastern New England. Meanwhile, the Great Lakes and much of the Appalachian region have a lovely Fourth (but take a jacket or sweater as you head out to the fireworks).
This map, which is updated frequently, showed our track forecast and main impact notes as of 10 AM ET.
This detailed pressure map can be helpful in identifying boundary zones along which clouds, showers and thunderstorms can form.