Drought conditions shift as storms bring mixed changes across Plains

South

Near- or warmer-than-normal temperatures covered most of the South this week. Rainfall amounts varied, with some areas staying completely dry, though amounts over 2 inches fell in parts of southern Arkansas, northern and southern Louisiana, central and western Tennessee, northeast Texas and a few parts of the Texas Panhandle and western Texas. Deficits in soil moisture and precipitation lessened in parts of far western Oklahoma, the Texas Panhandle and other areas of western Texas, leading to some improvements in ongoing drought. Likewise, long-term drought conditions were improved in portions of central Tennessee, aided by rains this week. A small area of severe drought developed in north-central Tennessee, where precipitation deficits grew and soils dried. Recent rainfall also improved soil moisture, streamflow and lessened precipitation shortages across much of northern and southeast Louisiana and central and southern Arkansas, leading to widespread improvements to drought or abnormal dryness. Isolated improvements also occurred in northwest Mississippi, though conditions across Mississippi were mostly stable as far as drought or dryness.

Midwest

Warmer-than-normal temperatures occurred across much of the Midwest this week, especially around the Great Lakes, where temperatures were mostly 6-12 degrees above normal. Heavy rains brought widespread amounts of 2-8 inches from portions of central and northern Iowa to southern Minnesota and central and west-central Wisconsin. Separately, heavy rains (mostly in the 2-6 inch range) fell west of Chicago eastward to southeast Michigan. Much of this rain fell in areas already free of drought or abnormal dryness, but some one-category improvements occurred northwest of Chicago, and one- and isolated two-category improvements occurred in northwest and north-central Iowa, southeast Minnesota and far western Wisconsin. Recent dry weather led to a few areas of abnormal dryness in the Michigan Upper Peninsula, northeast Minnesota and Isle Royale National Park, while similar recent dryness also led to expanding abnormal dryness and short- and long-term moderate drought south and southeast of St. Louis.

High Plains

Temperatures in the High Plains region were mostly near- or warmer-than-normal this week, with temperatures in eastern Nebraska and eastern South Dakota ranging from 3-6 degrees above normal. (Temperatures west of the Continental Divide were mostly below normal, though conditions in Wyoming and Colorado will be discussed in the West section.) Deficits in precipitation and soil moisture grew in parts of eastern Nebraska, where abnormal dryness and moderate drought expanded. North-central and western South Dakota also saw expansion of abnormal dryness and drought as short- and long-term precipitation deficits grew amid declining soil moisture and streamflow. Parts of central Colorado, especially near and east of Denver and Colorado Springs, saw conditions degrade this week as precipitation deficits grew. Similar conditions in north-central Colorado and south-central and northwest Wyoming, leading to degradations there. A small area of improvement occurred in north-central Wyoming, where vegetation conditions improved after recent precipitation. Scattered heavier rains fell in showers and thunderstorms that moved across parts of the Great Plains of northeast Colorado, the northern half of Kansas, parts of southwest and southeast Nebraska, and the Missouri and Big Sioux River corridors in South Dakota and northeast Nebraska. These rains locally improved drought or abnormally dry conditions.

West

Precipitation fell in portions of the Idaho-Montana border and across parts of southern and eastern Montana, and in a few areas of northwest Washington. Rainfall amounts around an inch fell in parts of New Mexico, though heavier amounts were mostly confined to east-central and southeast parts of the state, where conditions were re-assessed and local improvements occurred. Otherwise, much of the West region was dry this week. Conditions worsened in parts of central and southwest Colorado, where multiple large wildfires were occurring in areas of low soil moisture and large precipitation deficits. Degradations also occurred in parts of Oregon and adjacent far northern California and in north-central Washington. In these areas, streamflow levels remained low and precipitation deficits at both short- and long-term timescales grew. Water deliveries to properties near Bend, Oregon, were shut off this week as water supplies rain low. Widespread severe and extreme drought also continued in the eastern half of Nevada, Colorado, Wyoming, New Mexico, Utah and southern Idaho. Temperatures across the West region were mostly near- or cooler-than-normal, with temperature anomalies of 3-6 degrees below normal spreading across much of California, Nevada and parts of Arizona.

Looking Ahead

Through the evening of Monday, July 13, the National Weather Service Weather Prediction Center’s precipitation forecast shows mostly dry weather west of the Continental Divide, with rain amounts over 0.5 inches in southeast Arizona and in some areas near the southern New Mexico-Arizona state line. Mostly dry weather is also likely in the northern and southern Great Plains, though parts of the central Great Plains, especially in the southern half of Nebraska and northern half of Kansas, may receive rain amounts locally over an inch or higher. Rainfall amounts near or over an inch are expected in parts of the Southeast, Mid-Atlantic, Louisiana, Mississippi and Arkansas, plus portions of Missouri. Heavier rain amounts ranging from 1.5-3 inches are forecast from southern Illinois eastward through southern Indiana, Kentucky, eastern Tennessee and parts of West Virginia. Isolated rainfall totals at or above 0.75 inches are possible from Iowa eastward through the lower Great Lakes, though most areas should stay drier. Primarily dry weather is forecast in New England, especially in the southern half of the region.

For July 14-18, the National Weather Service Climate Prediction Center forecast favors drier-than-normal weather across the Great Lakes and central and northern Great Plains. Drier weather is also favored in far southern Florida. Wetter-than-normal weather is favored mostly across the Gulf Coast states and Carolinas, and in parts of the Desert Southwest, especially in southern Arizona. Hotter-than-normal weather is very likely across the northern Great Plains and West, and in the Florida Peninsula. Warmer-than-normal weather is also favored, though at lesser confidence, across most of the rest of the contiguous U.S., with a few exceptions. The forecast favors near-normal temperatures in southwest Texas and southeast New Mexico and in the eastern Great Lakes and most of the Northeast. Northern Maine is slightly favored to see cooler-than-normal temperatures.