As per reports, multiple hazardous weather conditions are forecast across the US between Monday (09 March) and Wednesday (11 March).

• On Monday (09 March), another round of rainfall and thunderstorms is expected to develop along a lingering frontal boundary across the Southeast (Alabama, Georgia, Mississippi, South Carolina, North Carolina, Florida, Tennessee). It is expected to gradually move northward.
• The Storm Prediction Center has placed portions of the Lower Tennessee Valley (western Tennessee, northern Mississippi, northern Alabama) and Mississippi Valley (Mississippi, western Tennessee, eastern Arkansas, southeastern Missouri) under a Slight Risk of severe weather (Level two of five), primarily due to the potential for large hail. In addition, organized storm clusters may produce periods of intense rainfall capable of generating isolated flash flooding.
• On Tuesday (10 March), a more complex upper-level weather pattern involving split northern and southern stream disturbances is forecast to increase the risk of severe weather and flash flooding across a large portion of the Midwest (Illinois, Indiana, Iowa, Missouri, Wisconsin, Michigan) and extending into the central and southern Plains (Kansas, Nebraska, Oklahoma, Texas).
• Thunderstorms are expected to develop along a slow-moving cold front extending from the Great Lakes (Michigan, Wisconsin, Illinois, Indiana, Ohio) southwestward through the Missouri Valley (Missouri, Iowa, Nebraska, Kansas) into the central Plains (Kansas, Nebraska) as well as ahead of a Pacific frontal system moving eastward through the southern Plains (Texas, Oklahoma).
• The structure of the upper-level pattern may result in a relative gap in storm activity, which may separate northern and southern severe weather zones. In the northern risk zone along the frontal boundary across the Great Lakes and Missouri Valley (Illinois, Indiana, Missouri, Iowa, Wisconsin), an Enhanced Risk of severe weather (Level three of five) has been issued.
• Thunderstorms in this region may produce large hail, damaging winds, and a risk of tornado development, including the possibility of strong tornadoes due to enhanced low-level wind shear along the boundary.
• Across the southern Plains (Texas, Oklahoma), a Slight Risk of severe weather (Level two of five) has been issued, where thunderstorms may also produce large hail, damaging winds, and isolated tornadoes, particularly across western Texas.
• Additionally, intense thunderstorms capable of producing heavy rainfall are expected both along the northern frontal boundary across the Great Lakes and Missouri Valley and ahead of the Pacific front from southern Oklahoma into central and western Texas. Slight Risks of Excessive Rainfall (Level two of four) have been issued for both regions.
• Thunderstorm activity is expected to continue into Wednesday (11 March) across portions of the Ohio Valley (Ohio, Kentucky, Indiana, West Virginia) extending southwestward into the Lower Mississippi Valley (Mississippi, Louisiana, Arkansas), where severe thunderstorms and isolated flash flooding remain possible.
• The greatest potential for light to moderate snowfall accumulation and ice accretion is expected across the Upper Great Lakes region (Michigan, Wisconsin, northern Minnesota). Wintry precipitation may also spread into northern Maine (Maine) on Wednesday (11 March).
• In the western US repeated rounds of rainfall in coastal and valley areas and snowfall at higher elevations is forecast over the Pacific Northwest (Washington, Oregon) extending into the Northern Rockies (Idaho, Montana, Wyoming) from Monday (09 March). Heavy snowfall is forecast in the region, particularly in the mountainous areas.
• Critical Fire Weather Risks (Level two of three) have been forecast across portions of the northern High Plains (Montana, Wyoming, western South Dakota) and southern High Plains (Texas Panhandle, eastern New Mexico, western Oklahoma) on Monday (09 March). Elevated fire weather conditions (Level one of three) are expected to continue across parts of the southern High Plains (Texas Panhandle, eastern New Mexico) on Tuesday (10 March).
• The highest temperatures are expected ahead of the frontal boundary across the Great Lakes (Michigan, Wisconsin, Illinois, Indiana, Ohio), Midwest (Iowa, Missouri, Illinois, Indiana), and central Plains (Kansas, Nebraska) on Monday, before spreading into the Mid-Atlantic (Virginia, Maryland, Delaware, New Jersey, Pennsylvania) on Tuesday (10 March), with temperatures forecast to reach the 70s degrees Fahrenheit.
• Across the southern tier of the country, including the southern Plains (Texas, Oklahoma), Southeast (Florida, Georgia, Alabama, Mississippi), and Florida (Florida), temperatures are expected to reach the 70s and 80s degrees Fahrenheit, with some locations approaching 90 degrees Fahrenheit.
• Warmer than average conditions are also forecast across New England (Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut), where daytime temperatures are expected to reach the 50s and 60s degrees Fahrenheit.
• Colder air behind the frontal boundary is forecast to begin spreading southward across the northern Plains (North Dakota, South Dakota, Nebraska) and Upper Midwest (Minnesota, Wisconsin, Iowa) beginning Monday (09 March) and extending into the central Plains (Kansas, Nebraska) on Tuesday (10 March), with daytime high temperatures falling into the 40s and 50s degrees Fahrenheit.
• In the western United States, above-average temperatures are expected across the Great Basin (Nevada, Utah) with highs reaching the 50s and 60s degrees Fahrenheit, while California (California) is forecast to experience highs in the 60s and 70s degrees Fahrenheit.
• Cloud cover associated with the upper-level low over the Desert Southwest (Arizona, New Mexico) is expected to keep temperatures closer to seasonal averages, with highs around the 70s degrees Fahrenheit. The cold front passing through the Pacific Northwest (Washington, Oregon) and Northern Rockies (Idaho, Montana, Wyoming) is expected to bring significantly colder conditions with daytime highs generally in the 30s and 40s degrees Fahrenheit.