Scattered showers and thunderstorms will spread across the Ohio/Tennessee Valley and East Coast tonight as a shortwave swings through the Great Lakes.
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Severe thunderstorms capable of producing a few tornadoes, damaging winds and some hail may impact portions of the Midwest and Ohio Valley.
Heavy rainfall leading to flash flooding is possible over parts of the Mid-Atlantic, extending from northern Virginia to southern New Jersey.
A cold front extending from the Ohio Valley system will be the focus for potential severe thunderstorms over portions of the Lower Mississippi Valley and Southeast tonight where damaging winds and isolated hail will be the main threats.
Flash flooding will be possible within areas of convection, especially over northern Alabama where there's a Slight Risk of excessive rainfall.
Scattered to isolated showers and thunderstorms will then fan out across the central Gulf Coast on Thursday as the aforementioned cold front arrives from the north.
Elsewhere, a meandering surface boundary over the Central/Southern Plains will become the focus for severe thunderstorms and excessive rainfall Thursday night.
A Slight Risk of severe thunderstorms is in effect for much of this area due to the threat of large hail and damaging winds caused by clustered and well-organized storms.
Rain rates may be high enough within any storms to produce flash flooding over portions of central Kansas into southwestern Missouri and northwestern Arkansas.
A new and deep system arrives over the Pacific Northwest on Thursday.
Isolated areas of heavy rainfall may lead to flash flooding over parts of the coast and interior through Friday.
Post-frontal showers and thunderstorms may develop over parts of the Northern Rockies Friday afternoon/evening.
A shortwave emerging from the Rockies on Thursday night/Friday will kick out the quasi-stationary boundary draped along the Southern Plains and develop a low along it.
This low may become the focus for additional severe weather and flash flooding as the aforementioned convection in Arkansas/Missouri moves into parts of southeastern Arkansas, central Mississippi and the Tennessee Valley.
A Slight Risk of severe thunderstors is in effect for portions of southeastern Arkansas and central Mississippi due to the threat of intense wind gusts associated with bowing mesoscale convective systems (MCSs).
Record breaking excessive heat is forecast over much of the Southwest this Friday and Saturday due to a building ridge.
High temperatures are expected to be in the upper 90s and 100s for much of central/southern California as well as the Southwest.
Little respite overnight as lows are also expected to tie or break records across much of the West on Thursday and Friday nights.
Excessive Heat Warnings are in effect for much of the Southwest.
Excessive Heat Watches/Advisories are in effect for much of central California and parts of western Nevada.
Records in southeast Texas continue to be threatened through the weekend as high temperatures remain in the low 100s. ■