Weather across America

(NATIONAL) A convective low pressure system bringing areas of heavy rain, gusty winds and hazardous beach and boating conditions for the Southeast into the Mid-Atlantic, showers and thunderstorms expected to linger across the Great Basin, northern and central Rockies, and the High Plains, warmer than normal across much of the Northwest and north-central U.S., and much cooler than normal across the Mid-Atlantic and Southeast.

A sluggish flow pattern will continue to feature troughing across both the West and the East Coasts against a slow-moving ridge over the Northeast. The western trough, with cooler temperatures aloft, will help trigger additional showers and thunderstorms across the Great Basin into the Northern Rockies of Montana each day once daytime heating increases the available instability. 

Meanwhile, strong to severe thunderstorms will be most active from late afternoon into the evening hours from southeast Montana down through the western Panhandle of Texas through the Memorial Day weekend. Embedded within the strong to severe thunderstorms will be heavy rainfall that is prone to result in a slight to moderate risk of flash flooding across the western half of Texas Sunday morning. 

The severe weather and flash flooding risks will become more limited in coverage and intensity for the rest of today and through the next couple  of days as the upper-level energy weakens, and the rain axis shifts east into the Great Plains. Meanwhile, convection associated with a low pressure system centered just off the South Carolina coast has weakened.  

New bands of heavy rain pushed onshore early Sunday morning into the coastal plain of the Carolinas, with another batch of moderate to heavy rain moving well inland across the central Appalachians.  

Coastal communities across the Southeast are still experiencing gusty winds, high surfs, and dangerous rip currents. As the core of the low pressure system moved farther inland Sunday, the associated rain and gusty winds will gradually weaken.  

However, the sluggish and blocky flow pattern will likely keep the remnants of the system over the southern to central Mid-Atlantic States with cloudy and rainy conditions lingering there for the next few days. Elsewhere, across the Mississippi Valley, Great Lakes, Northeast and Southwest should continue to enjoy a very pleasant weekend.  

Temperatures will be average for much of the southern portion of the central U.S.; though the northern tier, particularly the Plains and upper Great Lakes will see above normal, but not oppressive, temperatures in the 70s and 80s.  

New England will see temperatures cool back down into the 70s on Memorial Day behind a back-door cold front.