A high-pressure ridge will persist over the western CONUS today producing very hot temperatures, likely a degree or two above yesterday’s highs, across the inland Northwest as the ridge strengthens and shifts slightly eastward. Relative humidity in this region will likely drop a few percent down from recent condition, except in portions of northern California and southern and central Oregon, where the possibility of isolated afternoon and evening thunderstorms remains. Weak disturbances imbedded in the northwest flow may also bring isolated showers and thunderstorms to Wyoming and the northern Great Plains this afternoon. Monsoonal thunderstorms will continue over much of the greater Four Corners area as well as the southern half of Nevada and parts of southern California. Flash floods are possible in the vicinity of the storms in the Southwest and into the Southern High Plains. The far southern Plains continue to experience hot, dry, unstable, and breezy conditions, with the possibility of thunderstorms and gusty winds in far northeast Texas, parts of Oklahoma and into Arkansas. Precipitation is also forecast to continue from lower Mississippi Valley to the southern Atlantic Coast.