Posted May 12, 2018 4:58 p.m. EDT
Tropical moisture will fuel thunderstorms across the South on Sunday, which may produce locally heavy downpours that result in flash flooding. Farther north, an area of high pressure bulging westward across the rest of the Southeast will bring very warm and dry conditions from northern Florida through the Carolinas.
A nearly stationary front will be draped across the Mid-Atlantic and stretch back across the Ohio Valley into the western Great Lakes, bringing rain and heavy thunderstorms from New Jersey and Pennsylvania across northern Ohio and Indiana into southern Michigan and northern Illinois.
A storm will also continue to spin over the Rockies, creating showers and thunderstorms across Wyoming, southwest Montana, southern Idaho, northern Nevada and Utah. These slow-moving thunderstorms will be most prevalent during the afternoon and evening with locally heavy downpours possible. The West Coast will be dry with sunshine across Washington and Oregon.
Morning low clouds and patchy fog along the Southern California coasts will give way to sunshine. Sunshine is expected across the rest of California, but some clouds may roll in, especially near the Sierra Nevada, where there may be late-day showers or thunderstorms.
— Focus: Mother’s Day Outlook
Rain is expected from the lower Great Lakes to the upper Mid-Atlantic, which may disrupt outdoor plans for Mother’s Day. Tropical downpours will elevate the flood risk in South Florida.