Significant Heat in the Northwest U.S.; Tropical Rainfall Potential in the Southwest U.S.

A significant late season heat wave continues in the interior Pacific Northwest for at least one more day before easing somewhat Friday into Saturday. A combination of monsoonal moisture and tropical moisture ahead of tropical cyclone Lorena will bring a marginal to slight risk of excessive rainfall across the southwest U.S. through Saturday which may bring areas of flooding. Read More >

THURSDAY SEPTEMEBER 4, 2025: A cold front will approach from the west today, bringing showers and thunderstorms. Some storms could produce gusty or damaging winds. This front will decay overhead Thursday night. Brief high pressure provides dry and warm weather Friday. A much stronger cold front will move through Saturday bringing additional showers and thunderstorms. High pressure will build in from the Ohio Valley early next week.