Apex Wx

Heavy Rain and Flash Flooding Threats Continue Across the Southwest and Eastern United States
Heavy rainfall and flash flooding are possible today across parts of the Southwest, Great Basin, Ohio and Tennessee Valleys, and the Northeast. In Arizona, Nevada, Utah, and the Sierra Nevada, slow-moving monsoonal thunderstorms may produce intense rainfall, especially in mountainous terrain, slot canyons, and dry washes where flash flooding can develop quickly. Across the eastern United States, a strong cold front interacting with tropical moisture from Tropical Storm Bertha will fuel widespread thunderstorms capable of producing multiple inches of rain in a short time. Central Kentucky, central Tennessee, southeastern Virginia, and parts of the Delmarva Peninsula face an elevated flooding risk, with repeated storms possible. Along the Gulf Coast, Bertha should keep its heaviest rain offshore, although isolated heavy showers remain possible.

Limited Fire Weather Concerns Across the Northwest Despite Isolated Showers
Isolated Wildfire Risk Develops in Northern California, Oregon, and South Carolina
Elevated fire weather conditions are expected today in parts of northern California, western and central Oregon, and portions of South Carolina. In northern California and Oregon, isolated high-based thunderstorms may develop during the afternoon and evening. Although some storms could produce light rain, dry air near the ground and fast-moving storms will limit rainfall, increasing the chance that lightning could ignite new wildfires in very dry vegetation. Cloud cover and smoke should keep storm coverage limited, but any lightning strikes could create localized fire starts. In South Carolina, gusty winds, low humidity, and dry vegetation ahead of an approaching cold front will create locally elevated wildfire conditions. Residents should avoid activities that could spark fires and remain alert for changing conditions throughout the day.