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Astronomical summer will be underway this weekend, and Mother Nature has a smorgasbord of weather grilling up for the occasion.
Saturday
High pressure sliding off the Mid-Atlantic coast will prompt toasty temperatures throughout the day while aiding in thunderstorms for the Northeast. An upper-level disturbance travelling across the Upper Mississippi Valley and Great Lakes will add to the shower and thunderstorm activity this weekend. In fact, some of the thunderstorm activity may become strong or even severe over the Great Lakes.
Showers will likely end early across the Rockies and Great Plains as this disturbance exits eastward. This will allow for mostly dry weather from the Colorado Front Range to the West Coast, including the Great Basin and Pacific Northwest as high pressure builds overhead.
Remnant tropical moisture may allow for a few showers and perhaps thunderstorms across Texas on Saturday. Meanwhile, the east coast sea breeze will dominate the weather pattern across Florida, with showers and thunderstorms possible throughout the state.
As far as temperatures are concerned, highs will be peaking in the 90s and possibly low 100s across the Eastern U.S., including the Mississippi, Ohio and Tennessee valleys. Similar scorching high temperatures will be found across the Western U.S., including the Great Basin and California.
The only seasonable spots will be the northern Plains, Four Corners, Great Lakes and Northeast as highs hover in the 80s.
Sunday
The first official weekend of astronomical summer will conclude showers and thunderstorms taking over the East Coast while high pressure builds over two-thirds of the U.S.
The disturbance sliding across the Great Lakes will send a cold front through the Northeast, Mid-Atlantic and Southeast throughout the day. Thanks to high pressure weakening, this will likely result in showers and thunderstorms from New England to Florida through the evening hours. There may be a few robust storms over Florida and New England as well, with gusty winds likely the main concern.
High pressure will be taking over the Western U.S. on Sunday, allowing for mostly dry and hot weather from California and the Great Basin to the Rockies and Great Plains. A weak disturbance potentially developing in the evening over the Rockies may foster pop-up showers and thunderstorms across the Southwest. Otherwise, the weekend will close out on a quiet note for most in the U.S.
On Sunday, scorching temperatures will be found over much of the U.S., with summery upper 80s and 90s on the board and 100s again in the Desert Southwest. The only cool spots will be the beaches along the West Coast where temperatures may only peak in the 70s from southern California to northwestern Washington. It will also be somewhat cooler over the upper Great Lakes.