National Drought Monitor
Heavy rain fell this week across parts of the United States, bringing widespread relief from ongoing drought and abnormal dryness from northeast Texas northeast through the Mid-Atlantic. Recent rains shifted drought impacts more towards the longer term in some areas. Localized improvements after recent precipitation occurred in parts of southern New York and southern New England and in portions of the central Great Plains. Localized improvements occurred in small areas of northwest Alaska and north-central Puerto Rico after heavy rains this week. An assessment of shorter-term conditions in Utah and portions of western Oklahoma and western and southern Texas led to a few improvements. Warm and dry weather occurred this week in the western Great Lakes, especially in far northern Wisconsin, parts of the Michigan Upper Peninsula, northern Minnesota and eastern North Dakota. These areas saw widespread degradation given this week’s conditions. Drier areas in central Colorado also saw the expansion of extreme and exceptional drought this week. Abysmal streamflow and short-term precipitation deficits continued across parts of Washington, leading to widespread degradation there. Severe drought expanded in both south-central Puerto Rico and southeast Florida owing to short-term rainfall deficits in both areas.
Southeast
Widespread moderate-to-heavy rain fell across parts of the Southeast region this week, especially in Virginia and the Carolinas. Despite temperatures running 3-6 degrees above normal in the eastern Carolinas and southeast Georgia, the locally heavy rains and widespread moderate amounts mostly resulted in improvements or put a halt on further degradation of ongoing drought. Isolated spots in central Virginia and south-central North Carolina saw extreme drought expand, where 6-month precipitation deficits continued to grow and soil moisture and streamflow sank further below normal. Elsewhere, improvements were widespread in North Carolina and Virginia, while isolated locations in South Carolina and Georgia and the Florida Panhandle improved. Recent rainfall, especially from this week, helped to lessen short-term precipitation deficits that were starting to build in areas already suffering from long-term drought or abnormal dryness. These rains also augmented soil moisture and streamflow in many areas.
South
Wet weather occurred this week across much of Tennessee, portions of northern Alabama, much of south-central and western Louisiana and portions of eastern and south-central Texas. The heaviest rains exceeded 5 inches in parts of Texas and Louisiana, while 2-5 inches of rain were common in parts of Tennessee. Temperatures across the region were mostly within 3 degrees of normal, except for the southern Texas Panhandle and western north Texas, where temperatures were commonly 3-6 degrees warmer than normal. Temperatures from 3-6 degrees below normal occurred along the Rio Grande near Del Rio, Texas. From eastern Texas across southern Louisiana, and in Tennessee and far northeast Arkansas, this week’s rains lessened or locally eliminated precipitation deficits and led to improvements in soil moisture and streamflow. Conditions were reassessed and improved in parts of western and southwest Texas, adjacent western Oklahoma and the Oklahoma Panhandle and in parts of western and northern Arkansas, where recent precipitation has lessened mid-term precipitation deficits and locally improved streamflow and soil moisture.
Midwest
Heavy rains drenched the area from south of St. Louis (in southeast Missouri and southern Illinois) through much of Kentucky. Flash flooding impacted some areas south of St. Louis as a result of the heavy rain, where amounts exceeded 5 inches across a widespread area. However, these rains also lessened or eliminated precipitation deficits across many areas of southeast Missouri, southern Illinois and Kentucky, leading to widespread improvements to the Drought Monitor this week. More improvement may occur in the coming weeks as the impact of these rains on the water cycle is analyzed further. For now, the few remaining areas of drought in Missouri and south-central Kentucky are long-term in nature, though some shorter-term impacts lingered this week near the Kentucky/Virginia border. Farther north, mostly drier weather occurred, with a few exceptions. Heavier rains of 2-4 inches fell in north-central Iowa, leading to localized improvements to ongoing moderate drought and abnormal dryness. A narrow area of 2-inch rains fell across central Minnesota, though this was not enough to improve drying conditions in this region overall. Heavier rain amounts in the Keweenaw Peninsula in the Michigan Upper Peninsula alleviated short-term precipitation deficits there, and abnormal dryness was removed.
In northern parts of Minnesota and Wisconsin, and in the far western reaches of the Michigan Upper Peninsula, short-term precipitation deficits grew amid declining soil moisture and streamflow, leading to widespread development or expansion of abnormal dryness and moderate drought, and a small increase in severe drought coverage in northern Minnesota. Much of the southern half of the Midwest region saw temperatures within 3 degrees of normal, with local exceptions. In Minnesota, northern Wisconsin and northern Michigan, temperatures were mostly 3-6 degrees warmer than normal, with northern Minnesota mostly 6-9 degrees above normal. Amid the mostly hot and dry weather, fires were also occurring this week in northeast Minnesota. Isolated areas of moderate drought also developed in eastern Wisconsin, where short-term dryness led to similar conditions to areas farther north, albeit less widespread. In western Iowa, short-term precipitation deficits increased and soil moisture levels dropped, leading to an expansion of moderate drought.
High Plains
Rains exceeding 2 inches fell this week in northeast South Dakota and from parts of south-central Nebraska southeast through parts of northeast Kansas. Spotty heavy rain, locally in the 1.5-2-inch range, fell across eastern Colorado, western Kansas, western Nebraska and southwest South Dakota, as well as a few areas in North Dakota. These rains led to localized improvements in eastern Colorado, western Kansas and western Nebraska, where soil moisture improved and precipitation deficits decreased in severity. Widespread improvement to ongoing drought and abnormal dryness occurred in northeast South Dakota where the heaviest rains fell there. In eastern North Dakota, short-term precipitation deficits combined with reduced soil moisture, resulting in widespread expansion of abnormal dryness with a small area of moderate drought. A few areas in north-central and northwest South Dakota had a few degradations where short- and mid-term precipitation deficits and low soil moisture occurred. Temperatures in the northern portions of the High Plains region, particularly from northwest Nebraska north, were 3-9 degrees above normal this week as a heat wave took hold. The impacts of this heat and locally drier weather will be assessed in the coming weeks.
West
Aside from some moisture in southeast Arizona from the North American Monsoon, mostly dry weather occurred in the West this week to the west of the Continental Divide. In southeast Arizona, rains totaling 1-2 inches fell, though these were not enough to improve conditions. In southeast New Mexico, conditions were reassessed along with those in western Texas, leading to localized improvements where soil moisture, streamflow and mid-term precipitation deficits have recently improved. Localized improvements also occurred in parts of Utah where short-term precipitation deficits lessened. However, widespread severe and extreme drought was still taking place across most of the state amid poor streamflow across Utah. In eastern Washington, short- and mid-term precipitation deficits, recent warm temperatures and poor soil moisture led to the expansion of moderate drought. Moderate and severe drought also developed or intensified across several other parts of the state, where precipitation deficits persisted and soil moisture and streamflow decreased. Hot temperatures occurred from Arizona and western New Mexico northward to Montana and Wyoming. Temperatures were 3-6 degrees above normal for the week across most of these areas, while northeast Wyoming and south-central and eastern Montana were 6-12 degrees warmer than normal. Several cities in southern and eastern Montana set all-time record highs on Sunday, July 12, including readings of 115 F in Miles City and 111 F in Billings. The impacts of this heat wave on ongoing drought conditions will be assessed in the coming weeks. Temperatures along the Pacific Coast were generally within 3 degrees of normal.
Looking Ahead
The National Weather Service Weather Prediction Center is forecasting mostly dry weather across much of the Great Plains and Midwest through the evening of Monday, July 14. Heavier rain, locally in the 2-5 inch range in parts of Arizona, is forecast to fall in areas of south-central and southwest Texas and from Arizona and western New Mexico north into southwest Colorado, portions of Utah and a few parts of Wyoming and far south-central Montana. Heavy rains of 1-2 inches are forecast in the Florida Big Bend region, though the heaviest amounts are forecast to mostly stay offshore. Rain amounts of 0.75 inches or more are forecast from the southern Appalachian Mountains to the Northeast, and in parts of coastal North Carolina. Rains of 0.75 inches or more are also forecast in the Michigan Upper Peninsula and northern Lower Michigan. Mostly dry weather is forecast along the West Coast.
Looking ahead to July 21-25, the National Weather Service Climate Prediction Center’s forecast favors wetter-than-normal weather in parts of the southwest United States, especially in Arizona, New Mexico, Utah and Colorado. The forecast also favors above-normal precipitation from southeast California north through Montana and from the Texas Panhandle to North Dakota, though at lower confidence than in the Four Corners states. The forecast favors above-normal precipitation across most of the eastern U.S. to the east of the Appalachian Mountains, with the exception of south Florida, where near-normal rainfall is expected. Below-normal rainfall is slightly favored in Deep South Texas. Above-normal temperatures are favored in the western United States (except for parts of Arizona and New Mexico) and across the South and Southeast regions. The forecast favors near-normal temperatures in the northern Great Plains, while cooler-than-normal temperatures are more likely in the Upper Midwest, Great Lakes and Northeast.
For July 21-25, above-normal precipitation is favored in all of Alaska except for the southeast region of the state, where below-normal precipitation is more likely. Warmer-than-normal temperatures are favored in southeast Alaska and far-eastern interior Alaska. In south-central and southwest Alaska, the forecast favors cooler-than-normal conditions. In Hawaii, both above-normal precipitation and temperatures are favored.