Planning to travel this week? Here’s what could impact your route.
- Flash flooding threatens travel from southern Wisconsin and eastern Iowa through northern Illinois, northern Indiana and Ohio today into Sunday, with several inches of rain possible and active warnings in northeastern Iowa and northwestern Illinois.
- Repeated heavy rain across central and eastern Montana and northern Wyoming today and Sunday may flood low roads and trigger debris flows near recent burn scars, with locally more than 4 inches possible in Montana.
- Severe thunderstorms may disrupt travel from eastern Wyoming and Colorado into the central and southern Plains this weekend, with damaging winds and large hail possible.
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Significant travel weather for the next 2-3 days.
Weather Impacts Pacific:
— No significant weather impacts to travels expected today or Sunday.
Weather Impacts Mountain:
— Central and southwestern Montana, including the Helena, Meagher County and Gallatin valleys, Canyon Ferry, and the Little Belt, Highwood, Big Belt, Bridger, Castle, Elkhorn and Boulder mountains: A Flash Flood Watches continue today. Heavy rain could trigger flash flooding and debris flows near the Horse Gulch area and 2026 burn scars, while the valleys may receive around 1 inch with locally higher amounts near the mountains. Routes potentially affected: I-15, I-90, US-12, US-89, US-191, US-287.
— Central, southern and northeastern Montana, including Fallon and Carter counties, and northern and central Wyoming, including Yellowstone National Park, the Absaroka, Cody Foothills, Owl Creek, Bridger and Bighorn areas: Flood Watches continue through Sunday afternoon. South-central and southeastern Montana and north-central Wyoming could receive 1 to 3 additional inches, locally over 4 inches, with burn-scar debris flows possible; northeastern Montana may receive 1 to 2 inches, while rounds of moderate to heavy rain affect northern and central Wyoming. Routes potentially affected: I-25, I-90, I-94, US-12, US-14, US-16, US-20, US-87, US-89, US-191, US-212, US-287.
— Southeastern Montana and northeastern Wyoming: Today, a significant risk of excessive rainfall is centered in southeastern Montana, with flash-flood potential extending into northeastern Wyoming. A Slight Risk remains in northeastern Wyoming Sunday. Routes potentially affected: I-25, I-90, I-94, US-12, US-14, US-16, US-18, US-20, US-85, US-87, US-89, US-191, US-212.
— Eastern Wyoming and eastern Colorado: Severe thunderstorms are possible this afternoon and evening across eastern Wyoming and eastern Colorado, with a Slight Risk and the greatest large-hail threat in eastern Colorado. Another Slight Risk develops Sunday in eastern Colorado, with severe wind and hail possible. Routes potentially affected: I-25, I-70, I-76, I-80, I-90, US-6, US-14, US-16, US-18, US-20, US-24, US-26, US-30, US-34, US-36, US-40, US-50, US-85, US-160, US-285, US-287, US-385, US-400.
Weather Impacts Central:
— Northeastern Iowa and northwestern Illinois, including Clayton, Fayette, Dubuque and Jackson counties in Iowa and Jo Daviess and Stephenson counties in Illinois: FLASH FLOOD WARNINGS are in effect this morning. Clayton and Fayette counties in Iowa are warned until 8:15 AM CDT after 1 to 3 inches fell; the Dubuque-Jackson area in Iowa and Jo Daviess-Stephenson area in Illinois are warned until 10:15 AM after 1 to 2 inches. Another 1 to 2 inches is possible in both areas, with flooding of roads, underpasses, creeks and low spots. Routes potentially affected: US-18, US-20.
– Central, north-central and northeastern South Dakota, including Jerauld, Brule and Aurora counties, and southwestern Minnesota, including Lincoln, Lyon, Murray, Cottonwood and Pipestone counties: Dense Fog Advisories this morning. Visibility may fall to one-quarter mile or less across most of the area, with one-half mile or less at times in Jerauld, Brule and Aurora counties in South Dakota. Routes potentially affected: I-29, I-90, US-12, US-14, US-59, US-71, US-81, US-83, US-212, US-281.
— Western South Dakota and far northwestern Nebraska: A Slight Risk of excessive rainfall is forecast Sunday, with scattered thunderstorms capable of localized heavy rain and flash flooding. Routes potentially affected: I-90, US-14, US-16, US-18, US-20, US-83, US-85, US-212, US-385.
– Southern and western Nebraska, central and eastern Kansas, northern Oklahoma, the Texas Panhandle, South Plains and Permian Basin, southern Iowa, and northwestern Missouri: Severe thunderstorms are possible this afternoon and evening, with the Slight Risk and greatest large-hail and damaging-wind threat focused on central and eastern Kansas. Isolated severe wind or hail may extend across the rest of the outlined Plains and lower Missouri Valley area. Routes potentially affected: I-10, I-20, I-27, I-29, I-35, I-40, I-49, I-70, I-76, I-80.
— Far southeastern and northwestern Kansas, much of Oklahoma, the South Plains, North Texas and West Texas, central and southern Missouri and Illinois, northwestern Kentucky, northern Arkansas, and southwestern Nebraska: Sunday brings another broad severe-thunderstorm risk. Damaging winds are the main concern across much of Oklahoma and nearby portions of Kansas, Texas, Missouri, Illinois, Kentucky and Arkansas, locally reaching Slight Risk; southwestern Nebraska and northwestern Kansas also have a slight risk of severe wind and hail. Routes potentially affected: I-20, I-35, I-40, I-55, I-64, I-70, I-74, I-76, I-80.
— Southeastern Kansas, central, eastern and southern Missouri, central and southern Illinois, southern and western Kentucky, and south-central and southwestern Indiana: Heat Advisories cover the region. Heat indices reach 100 to 105 degrees today, including around 105 degrees in southeastern Kansas, central and southern Missouri, southern and western Kentucky, and adjacent Indiana. The advisory continues through Sunday in southeastern Missouri, southern Illinois, western Kentucky and southwestern Indiana, where indices may reach 102 degrees.
— South-central and southeastern Minnesota, north-central and northeastern Iowa, and southern Wisconsin: Flood Watches continue through early afternoon across Minnesota, northern Iowa and parts of Wisconsin, and through early evening farther south. Additional rainfall of 2 to 4 inches is possible from southeastern Minnesota into northeastern Iowa and southwestern Wisconsin; another 1 to 2 inches may fall over already wet south-central and southeastern Wisconsin, raising creeks and flooding low-lying and urban areas. Routes potentially affected: I-35, I-39, I-41, I-43, I-90, I-94.
— Southern Wisconsin, eastern Iowa and northern Illinois: Today, excessive-rainfall concerns include a significant corridor within eastern Iowa and northern Illinois, with heavy rain also affecting southern Wisconsin. A slight risk of flash flooding continues Sunday in northern Illinois. Routes potentially affected: I-35, I-55, I-74, I-80, I-90, I-94.
— East-central and northeastern Iowa, northern and west-central Illinois, including Boone, Winnebago, Ogle, McHenry and Lake counties, and northwestern Indiana: A Flood Advisory remains in effect through mid-morning in Boone, Winnebago, McHenry and Lake counties in Illinois, where 1 to 2 inches has fallen and another 1 to 2 inches is expected. Flood Watches continue through early afternoon across northern Illinois and northwestern Indiana, and through Sunday morning from east-central and northeastern Iowa into northwestern Illinois; storms there may produce 1 to 2 inches per hour and localized totals over 3 inches. Routes potentially affected: I-39, I-55, I-57, I-65, I-74, I-80, I-88, I-90, I-94.
— A small portion of southeastern Missouri, West and Middle Tennessee, eastern Arkansas, central, northern and southwestern Mississippi, and northern and central Alabama: Heat Advisories cover the Mid-South today, with heat indices generally reaching 105 to 107 degrees across eastern Arkansas, Mississippi, West Tennessee and central Alabama; northern Alabama reaches 100 to 105 degrees. Middle Tennessee may reach 108, and its advisory continues through Sunday evening.
— Eastern Illinois, northwestern Kentucky, eastern central and western Tennessee, and northeastern Alabama: There is a marginal chance for severe thunderstorms today, with isolated damaging gusts possible mainly during the late afternoon and early evening. Routes potentially affected: I-20, I-24, I-40, I-57, I-59, I-70, I-72, I-74, I-85.
— Eastern central and western Tennessee and northern Alabama: Strong to isolated severe thunderstorms are forecast for Monday, with isolated severe gusts possible from stronger afternoon thunderstorms. Routes potentially affected: I-20, I-22, I-24, I-40, I-59, I-65.
Weather Impacts East:
— Southern Michigan, including Allegan, Barry, Van Buren, Kalamazoo and Calhoun counties, north-central and northeastern Indiana, and a small portion of west-central and northwestern Ohio: Flood Watches continue through Sunday morning. One to 2 inches is likely across northern Indiana, southwestern Michigan and northwestern Ohio, with local totals up to 3 inches mainly near the Indiana-Michigan border; repeated rain may flood creeks, low-water crossings and poor-drainage areas. Routes potentially affected: I-69, I-80, I-90, I-94, US-24, US-27, US-30, US-31, US-127, US-131, US-421.
— The southern Michigan Lower Peninsula, northern Indiana, Ohio, and central and northern West Virginia: Today, excessive-rainfall concerns include a signficant risk for flash flooding within the southern Michigan-Lower Great Lakes corridor, with flash flooding possible into Ohio and central and far northwestern West Virginia. Sunday, a slight risk for flash flooding covers northern Indiana, central and southern Ohio, and central and northern West Virginia. Routes potentially affected: I-65, I-70, I-71, I-74, I-75, I-76, I-79, I-80, I-90, I-94.
— Central and southern Indiana, southern Ohio, northern, southern and eastern Kentucky, eastern Tennessee, western West Virginia, southern Virginia, central and western North Carolina, northwestern South Carolina, and northwestern Georgia: Today, strong to isolated severe thunderstorms may contain severe gusts from central and southern Indiana and southwestern Ohio through eastern Kentucky and Tennessee into far southwestern West Virginia, Virginia and North Carolina and northwestern Georgia. On Sunday, the risk for isolated severe wind or hail shifts across southern Ohio, northern and eastern Kentucky, East Tennessee and the central Appalachians. Monday, a continued marginal risk for isolated damaging gusts extends from southern and eastern Kentucky through eastern Tennessee, southern Virginia and the western Carolinas into northwestern Georgia. Routes potentially affected include I-20, I-40, I-64, I-65, I-70, I-71, I-74, I-75, I-79, I-81, I-85, I-87, I-95.
— West-central Florida, including Citrus, Levy and Marion counties along the Withlacoochee River at Dunnellon: A Flood Warning continues until further notice. The Withlacoochee River at Dunnellon was at its 28.2-foot flood stage Friday evening and is forecast to remain above flood stage, with minor flooding of docks and boat ramps in Citrus and Marion counties. Routes potentially affected: US-41.
Tropical Weather Outlook for the next 7 days:
Eastern Subtropical Atlantic, southwest of the Azores: A tropical depression could form later today, with formation odds of 80% through seven days. The system should remain southwest of the Azores, and conditions become less favorable Sunday night or Monday; no continental U.S. threat is indicated.
Extended Hazard Outlook
Outlook Monday September 21st through Friday September 25th:
— Monday, September 21 through Thursday, September 24: Southeastern Texas and southwestern Louisiana: Hazardous heat may create challenging conditions. Major highways potentially affected include I-10, I-35.
— Monday, September 21: From the southern Plains through the Lower Mississippi and Tennessee valleys into Alabama: Hazardous heat may create challenging conditions. Major highways potentially affected include I-20, I-30, I-40, I-55, I-65.
— Tuesday, September 22 through Friday, September 25: Southeastern Arizona, most of New Mexico, and northwestern Texas: Heavy rain may create localized flooding and reduced visibility. Major highways potentially affected include I-10, I-25, I-40.
— Tuesday, September 22 through Friday, September 25: Much of Florida: Heavy rain may create localized flooding and reduced visibility. Major highways potentially affected include I-75, I-95.
— Tuesday, September 22 through Wednesday, September 23: Central Appalachians and Mid-Atlantic, from eastern Ohio and southwestern Pennsylvania through West Virginia and Virginia into Maryland and northeastern North Carolina: Heavy rain may create localized flooding and reduced visibility. Major highways potentially affected include I-64, I-70, I-76, I-79, I-81, I-85, I-95.
— Thursday, September 24: Mid-Atlantic through southeastern New York into southern New England and southeastern New Hampshire: Heavy rain may create localized flooding and reduced visibility. Major highways potentially affected include I-70, I-76, I-80, I-81, I-84, I-87, I-90, I-91, I-95.
Extended Outlook September 26th through October 2nd:
— Saturday, September 26: From Utah and Arizona through Colorado and New Mexico into the southern High Plains and Texas: Heavy precipitation may develop, creating localized flooding and difficult travel. Major highways potentially affected include I-8, I-10, I-15, I-20, I-25, I-40, I-70.
— Saturday, September 26 through Friday, October 2: Most of Florida: Heavy precipitation may develop, creating localized flooding and difficult travel. Major highways potentially affected include I-4, I-10, I-75, I-95.
Confidence in the Extended Outlook:
Confidence is generally average, with good agreement on the large-scale pattern but important uncertainty in the details. Confidence decreases later in the outlook as the pattern becomes more transient and predictable signals weaken.
Looking for real-time road conditions? Here’s a link, courtesy of the Federal Highway Administration, to all the individual State 511 websites.
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