A few areas of active weather will develop throughout the nation Thursday as a trough of low pressure lingers over the Northeast and a ridge of high pressure holds on to the southwestern and south-central regions of the country.
A weak trough of low pressure will support more showers and thunderstorms in the Northeast as a cold front moves through the region. While added cloud cover and light winds will offer a small amount of cooling during the next couple of days, a major temperature drop is not anticipated with the passing of this system. Showery weather conditions with some afternoon storms will continue into the weekend. High pressure will follow this activity with clearer and drier skies by Sunday.
To the south, daytime heating and gulf moisture will stir up another round of afternoon thunderstorms in the Southeast. Meanwhile, a frontal boundary and waves of low pressure from the Plains will drop into the Mid-Mississippi Valley with additional rain and thunderstorms during the day. Expect a slight risk of severe weather development in the Mid-Mississippi Valley, especially in southern Missouri, during the afternoon with damaging wind and hail.
To the west, high pressure over the Four Corners and the Southern Plains will provide another day of hot temperatures in these areas. High humidity levels coupled with high temperatures in these regions will create uncomfortable outdoor conditions. Areas of Texas may see some relief from this weather by early next week as a tropical trough moves into the state with some much needed rainfall.
Farther west, monsoon moisture streaming into southern California and the Southwest will trigger more slow moving thunderstorms with periods of heavy rainfall. Strong runoff from these storms will likely raise flood concerns.
Elsewhere, a trough of low pressure will bring cooler weather to the Pacific Northwest during the next couple of days.
Temperatures in the Lower 48 states Wednesday ranged from a morning low of 37 degrees at Stanley, Idaho, to a high of 107 degrees at Lawton, Okla.