Monday, 11:30 A.M.
Summer is FAR from done. Feast your eyes on Sunday's highs:
That's a lot of places from the Mississippi Valley to the eastern Rockies, and from the southern Plains to the Canadian border that hot 90 or better on Sunday, with a few places reaching the century mark. This ridge isn't going anywhere, and it is slowly but surely drying out the atmosphere across the central and southern Plains to the Tennessee Valley and much of the South. In fact, the 12z Aug. 26 NAM total precipitation forecast through Thursday shows a large area of the country devoid of any kind of precipitation:
The middle of the country will simply bake all week long, and that includes the Mississippi Valley and adjacent areas of the western Ohio and Tennessee valleys. As the week wears on, it will get progressively hotter, with 100-degree readings likely to be seen in parts of the interior South and southern Plains by Wednesday or Thursday. They won't be widespread, mind you, but they will show up.
The heat will try to expand into the East, but with far less success, at least initially. The position of the upper-level ridge, and its structure, simply won't allow it to come bodily eastward. Here's the latest NAM 500 mb forecast for tomorrow evening:
Thunderstorms forming at the apex of that ridge will head downstream, and that means following the upper-level flow southeastward. One round has moved out of the Lakes into the Northeast overnight. Another is now in northern Wisconsin and northern Michigan, though its clearly weakening. Still another will develop in the next 24 hours and head southeastward, all of which will have the effect of cutting the heat off at the past for several days.
Eventually, though, the upper-level flow will flatten over the weekend, and SOME of that heat will be allow to come farther downstream. What remains to be seen is how much of it can survive over the Appalachians into the East later in the Labor Day weekend, and what role thunderstorms may play, if any, in keeping it from getting to the 90s.
Several storms are going to be tracking across the country between now and the end of next week, with still some snow potential with at least two of the storms.
Storms will cross the country between now and Christmas, but the chances of a White Christmas are fading for many places in the East with time.
Two storms still have the potential to bring a white Christmas to areas that are currently snowless from the northern Plains and Midwest to the Northeast.
Two storms will track across the country between now and Christmas that could deliver parts of the country snow in time for a white Christmas.
Heavy rain is pounding California today, with flooding and mudslides. The storm in New England continues spreading snow across Upstate New York and parts of Pennsylvania.
A powerful storm over southeastern New England will continue impacting the Northeast into the weekend, while a series of storms are poised to bring heavy to California.