As per reports, the US weather forecast for Monday (01 June) is as follows:

• A complex and active weather pattern is expected across large portions of the continental US between Monday (01 June) and Wednesday (03 June) as multiple upper-level disturbances move through the country. The primary forecast include widespread thunderstorms, localized heavy rainfall, severe weather potential, and temperature anomalies affecting different regions.
• On Monday (01 June), an upper-level low pressure system positioned near the United States–Canada border is expected to support persistent shower and thunderstorm activity across parts of the Northern Rockies, Great Plains, and portions of the Southeast. States that may be affected include Montana, Idaho, Wyoming, North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, Missouri, Arkansas, Tennessee, Mississippi, Alabama, Georgia, and the Carolinas.
• Increasing southeasterly flow and atmospheric instability along an associated frontal boundary may enhance thunderstorm development and create opportunities for locally heavy rainfall. The Weather Prediction Center has identified portions of the Northern Rockies, Great Plains, and Central Mid-South under a Marginal Risk for excessive rainfall.
• A broad corridor of moisture originating from the Gulf of Mexico is expected to extend from Texas into the central Plains. This moisture supply may contribute to widespread afternoon and evening thunderstorm development.
• Several thunderstorm clusters may organize along existing weather boundaries and areas of low-level atmospheric convergence. The Storm Prediction Center has issued a Slight Risk of severe thunderstorms across parts of the Central High Plains, including eastern Colorado, western Kansas, southwestern Nebraska, and adjacent areas, while a Marginal Risk of severe weather extends into portions of the Southeast.
• By Tuesday (02 June), the frontal boundary is forecast to become more organized and extend across the southern US. Deepening easterly and southeasterly winds are expected to transport significant Gulf moisture into higher terrain areas of the Southwest. This setup may enhance rainfall and thunderstorm development across eastern New Mexico and western Texas.
• Further north, a secondary frontal system and an approaching shortwave disturbance are expected to reinforce thunderstorm activity across the northern Plains. States including Montana, North Dakota, South Dakota, Nebraska, Wyoming, and northern Colorado may experience additional rounds of rainfall and thunderstorms.
• Along the Gulf Coast, a quasi-stationary frontal boundary may serve as a focus for repeated rounds of showers and thunderstorms. Portions of Texas, Louisiana, Mississippi, Alabama, and the Florida Panhandle may experience localized heavy rainfall and isolated flooding concerns. A Marginal Risk of excessive rainfall has been outlined for these areas.
• Temperature patterns will also vary considerably across the country. An expanding upper-level ridge over the central and eastern US is expected to promote above-average temperatures from Texas through the Mississippi Valley, Midwest, and parts of the Ohio Valley. States that may experience warmer-than-normal conditions include Texas, Oklahoma, Arkansas, Louisiana, Missouri, Iowa, Illinois, Indiana, Ohio, Kentucky, and surrounding areas.
• In contrast, below-average temperatures are expected to persist across parts of Washington, Oregon, Idaho, western Montana, and portions of the northern Rockies due to continued upper-level troughing.