USDA's Joint Ag Weather Facility says on the Plains, a late-season cold outbreak continues to threaten jointing winter wheat across the southern half of the region. "On April 13, four-fifths (80%) of Oklahoma’s wheat was jointing, along with 31% in Kansas and 6% in Colorado. In Texas, 16% of the wheat had headed by April 13," USDA details. This morning’s temperatures dipped to 32°F or below throughout Oklahoma and western Texas, with numerous readings below 25°F, USDA continues.
In the West, USDA says cooler air is arriving in several areas, but warmth persists in California and the Great Basin. "The average water content of the high-elevation Sierra Nevada snowpack has declined to 7 inches (about one-quarter of the mid-April normal), down from a seasonal peak of 10 inches," USDA continues.
In the Corn Belt, USDA reports rain is changing to snow from the middle Ohio Valley into the lower Great Lakes region, while snow showers are occurring downwind of Lakes Superior and Michigan. "Overnight snowfall pushed seasonal totals to all-time records in Michigan locations such as Detroit and Flint," USDA elaborates. Very cold air trails the departing storm, with a few sub-zero temperatures noted this morning in the upper Great Lakes region, according to USDA.
In the South, USDA says cold air is arriving. In fact, USDA reports rain is changing to snow before ending in parts of Kentucky and Tennessee. "For tomorrow, concerns exist with respect to emerged summer crops; on April 13, for example, corn emergence had reached 28% in Mississippi, 25% in South Carolina, and 17% in Alabama," USDA explains. Meanwhile, showers and thunderstorms associated with a strong cold front are sweeping across the southern Atlantic states, according to USDA.
In its outlook, USDA says NWS freeze warnings are in effect early today across a large area from the central and southern Plains into the middle Mississippi Valley and the mid-South. "Freeze warnings have already been issued for Wednesday morning from the Ohio Valley and mid-Atlantic region southward, extending into northern Georgia and much of Mississippi and Alabama," USDA continues. Elsewhere in the East, precipitation will end later today, although a period of accumulating snow can be expected from the central Appalachians to northern New England, USDA adds. On Wednesday, USDA reports another round of late-season snow will develop in the upper Great Lakes region. "Toward week’s end, precipitation will affect several areas, including the lower Southeast, south-central U.S., and Pacific Northwest," USDA explains.