***Warm weather continues across the southern U.S.***
***Cold front for the Northeast and Mid-Atlantic***
***Scattered showers and storms in the western U.S.***
Above normal temperatures are forecast to continue over the next few days from the Desert Southwest to the Southeast. This region will be south of the main frontal zone situated across the nation's mid-section. There will also be noticeable levels of humidity with dewpoints well into the 60s. Some scattered shower and thunderstorm activity is in store for parts of the Lower Mississippi River Valley as Gulf moisture surges northward around a surface high pressure ridge.
Farther to the north, a slow moving cold front is forecast to edge
southward from the Ohio Valley and the Northeast into the Mid-Atlantic
region. This will bring down temperatures closer to average for mid May after a couple of very warm days. Onshore flow from the Atlantic late in the week and into the weekend will keep more clouds around and showers are likely along and south of the frontal boundary, extending from the Upper Midwest to North Carolina.
Elsewhere, scattered showers and storms remain in the forecast for much of the Inter-Mountain West and extending into the Pacific Northwest to close out the work week. A large scale trough in the atmosphere will allow for enough instability for convection over this region, and some onshore flow from the Pacific will generate some showers for the coastal areas from northern California to Washington state.