The weather outlook across various regions of the United States this weekend presents a diverse set of conditions:
Midwest/Ohio Valley & Mid-Atlantic States:
- A heat wave persists south of a stationary front, with temperatures rising into the upper 90s/near 100 degrees Fahrenheit in the Mid-Atlantic.
- Record-breaking temperatures are possible, with heat index values reaching 100-105 degrees, and up to 110 degrees in the southern Mid-Atlantic.
- Overnight lows remain in the mid-70s, exacerbating heat stress, especially for those without adequate cooling.
- Heat-related Advisories and Warnings are in effect.
Upper Midwest & Great Lakes:
- Heavy rain and flash flooding concerns due to thunderstorm complexes ahead of a surface wave.
- A Moderate Risk of Excessive rainfall is in place, particularly in southeast South Dakota, Minnesota, and Iowa border areas.
- River flooding is expected to worsen, with scattered instances of flash flooding possible across the region.
- Severe thunderstorms with damaging winds are also possible.
New England and Northeast:
- Cooler temperatures prevail north of the frontal boundary, with highs mostly in the 70s and low 80s.
- Elevated risk of flash flooding as the system moves into New England on Sunday.
Southeast Coast:
- A convective low near the Southeast Coast could bring isolated heavy rainfall and flash flooding to parts of northeast Florida and Southeast Georgia.
- Potential for tropical cyclone development with a 60% chance of becoming a tropical depression before landfall.
Southern Gulf of Mexico:
- Another tropical disturbance has a 60% chance of forming into a tropical depression, posing a risk of isolated flash flooding over areas affected by recent heavy rainfall.
West and Southwest:
- A warm core high shifting into the West will bring monsoon-like conditions with afternoon and evening thunderstorms.
- Locally heavy rainfall and flash flooding are expected, particularly in dry washes, arroyos, and areas with burn scars.
- High temperatures soaring into the 100s in portions of the Great Basin and central California Valleys may approach record values.
- Excessive Heat Warnings issued for central and southern California.
Overall, the weekend weather across the United States highlights significant heat in the East, potential for severe weather and flooding in the Midwest and Great Lakes, and tropical weather concerns in the Southeast and Gulf of Mexico. The West faces heat and monsoon-related weather, emphasizing the need for caution and preparedness in affected areas.