Planning to travel this week? Here’s what could impact your route.
- Severe thunderstorms threaten the Upper Midwest and Great Lakes late today, followed by a broader damaging-wind, hail and tornado risk from the Ohio Valley through the Northeast and Southeast on Tuesday.
- Tropical Depression Two is expected to strengthen today and bring tropical storm conditions, coastal flooding and heavy rain from Mobile Bay through Florida’s Gulf Coast Tuesday through Thursday, with fresh-water flooding and a storm surge up to 3 feet in parts of coastal Alabama.
- High heat spans much of the central and southern United States today and Tuesday, with heat index values reaching 110 to 115 degrees in the hottest areas.
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Significant travel weather for the next 2-3 days.
Weather Impacts Pacific
— Washington and Oregon: Extreme Heat Watch Tuesday through Thursday and Heat Advisories Tuesday and Wednesday with temperatures up to 105 degrees, including the Portland, Vancouver and Seattle areas. I-82, I-84, US-12, US-97, US-395 impacted.
— Southeastern Oregon and southwestern Idaho: Heat Advisory today with temperatures up to 103 degrees, making daytime travel and outdoor stops more difficult.
— Northern Nevada: Heat Advisory today with temperatures up to 103 degrees.
— Northern California: Red Flag Warning today includes isolated dry thunderstorms and erratic gusts up to 30 mph that could support rapid fire spread. CA-3, CA-36, CA-96, CA-299 impacted.
— Central and northeastern Nevada: Flash flooding is possible Tuesday as numerous storms may affect dry washes, slot canyons and rocky terrain. I-80, US-6, US-50, US-93 potentially impacted.
— Western Nevada and east-central California: Flood Watch today covers the potential for slow-moving or repeated thunderstorms to cause flash flooding of streams, urban areas, burn scars and steep terrain. US-6, US-95, US-395, CA-89, CA-120 potentially impacted.
Weather Impacts Mountain:
— Southern Idaho, northeast Wyoming, western South Dakota, the Nebraska Panhandle, northwest Utah and northern Colorado along the I-25 corridor: Heat Advisories today, continuing into Tuesday in northern Utah, with temperatures up to 103 degrees and heat index values up to 100 degrees, including the Denver metro area.
— South-central and southeast Idaho, western Wyoming, much of Utah, and western Colorado: Flash flooding is possible Wednesday, potentially affecting low crossings and flood-prone terrain. I-15, I-70, I-80, I-84, I-86, US-6, US-14, US-16, US-20, US-24, US-26, US-30, US-34, US-40, US-50, US-64, US-84, US-89, US-93, US-160, US-189, US-191, US-212, US-285, US-287, US-491, US-550 potentially impacted.
— Much of Utah, northern, central and eastern Arizona, and western New Mexico: Numerous thunderstorms Tuesday may produce scattered flash flooding in slot canyons, dry washes and rocky terrain. I-10, I-15, I-17, I-19, I-25, I-40, I-70, I-80 potentially impacted.
— Southeast Arizona and southwest New Mexico: Flood Watches today and Tuesday cover heavy thunderstorms and flooding of low-lying roads, streams and crossings. Localized rainfall of 1 to 3 inches is possible in southeast Arizona, where saturated soils will increase runoff. I-10, I-19, US-70, US-191 potentially impacted.
Weather Impacts Central
— South-central North Dakota and north-central South Dakota: Red Flag Warnings today include wind gusts up to 40 mph that may support rapid fire spread. I-94, US-12, US-83, US-212 impacted.
— Southern South Dakota, Nebraska, much of Kansas, parts of eastern Minnesota, northwest Wisconsin, most of Iowa, Missouri, western Illinois, and western Kentucky: Heat Advisories with embedded Extreme Heat Warnings and Watches today and Tuesday. Heat index values up to 110 degrees. I-29, I-35, US-20, US-50, US-54, US-59, US-71 impacted.
— Eastern Nebraska, southern and eastern Minnesota, Wisconsin, Iowa, northern Missouri, and much of Illinois: Severe thunderstorms are expected late today into tonight, with swaths of damaging wind, large hail and a few tornadoes possible. The greatest risk of severe weather will be across most of Wisconsin, eastern Iowa, and northwest Illinois. I-29, I-35, I-35E, I-35W, I-39, I-41, I-43, I-55, I-57, I-70, I-72, I-74, I-80, I-88, I-90, I-94 potentially impacted.
— Central and eastern Oklahoma, northeastern Texas, Missouri, Tennessee, Arkansas, much of Louisiana, Mississippi and northern and western Alabama: Extreme Heat Warnings, Watches and Advisories today and Tuesday, with heat index values as high as 115 degrees. I-2, I-30, I-40, I-44, I-49, I-55, I-69, I-69C, I-69E impacted.
— Southeastern Missouri, southeastern Illinois, Kentucky and Tennessee: Severe thunderstorms are possible Tuesday afternoon into nighttime, with damaging wind the primary threat and large hail and a tornado also possible. I-24, I-40, I-55, I-57, I-59, I-64, I-65, I-69, I-70, I-75 potentially impacted.
— Southeastern Louisiana: Flash flooding associated with Tropical Depression Two is possible Wednesday, potentially covering low roads and poor-drainage areas. 2 to 4 inches of rainfall is possible. I-10, US-90 potentially impacted.
— Coastal Alabama and the Florida Panhandle from Mobile Bay through Panama City: Tropical Storm Watches associated with Tropical Depression Two are in effect today for possible tropical-storm-force winds within 48 hours. Potential winds are 39 to 57 mph, although the latest local forecasts show gusts up to 35 mph. Storm surge could reach 1 to 3 feet around Mobile Bay and up to 2 feet eastward Tuesday evening through Thursday, while additional rainfall may reach 1 to 3 inches with locally higher amounts near Panama City and around 1 inch farther west. I-10, I-65, US-43, US-98, US-231 potentially impacted.
Weather Impacts East
— Michigan, northern and central Indiana, and northwestern Ohio: Severe thunderstorms are expected late today into tonight, with swaths of damaging wind, large hail and a few tornadoes possible. The greatest risk of severe weather will be across the Michigan Upper Peninsula. I-57, I-65, I-69, I-70, I-74, I-75, I-80, I-90, I-94, I-96 potentially impacted.
— Much of Indiana, Ohio, Kentucky, Tennessee, West Virginia, eastern New Hampshire, Vermont, Massachusetts except Cape Cod, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Maryland, District of Columbia, Delaware, Virginia, North Carolina, upstate South Carolina, and northern Georgia: Numerous severe thunderstorms are possible Tuesday afternoon into Tuesday night, with swaths of damaging wind the primary threat and large hail and tornadoes also possible. The greatest risk of severe weather will be across southern and eastern Ohio, north-central Kentucky, most of West Virginia, much of Pennsylvania, central and western Maryland, and northwestern Virginia. I-24, I-26, I-40, I-59, I-64, I-65, I-66, I-68, I-69, I-70, I-71, I-73, I-74, I-75, I-76, I-77, I-78, I-79, I-80, I-81, I-83, I-84, I-85, I-86, I-87, I-88, I-89, I-90, I-91, I-93, I-94, I-95, I-96, I-97, I-99 potentially impacted.
— Southern Ohio, eastern Kentucky, northeastern Tennessee, West Virginia, southern Pennsylvania, much of New Jersey, Maryland, District of Columbia, Delaware, and Virginia: Flash flooding is possible Tuesday, with heavy storms potentially flooding low roads and crossings. I-26, I-64, I-65, I-66, I-68, I-70, I-71, I-74, I-75, I-76, I-77, I-79, I-81, I-83, I-85, I-95, I-97, I-99 potentially impacted.
— Northeastern Tennessee, southern Virginia, North Carolina, and adjacent northern South Carolina: Scattered severe thunderstorms today may produce damaging wind gusts. I-26, I-40, I-64, I-73, I-74, I-77, I-81, I-85, I-87, I-95 potentially impacted.
— Southern DELMARVA Peninsula, southeastern Virginia, North Carolina, much of South Carolina, and northeastern Georgia: Repeated thunderstorms may cause flash flooding Wednesday, including water over low roads and crossings. I-20, I-26, I-40, I-64, I-73, I-74, I-77, I-81, I-85, I-87, I-95 potentially impacted.
— Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, Long Island, southern New Jersey, eastern Maryland, much of Delaware, much of Virginia, North Carolina, and most of South Carolina: Isolated to scattered severe thunderstorms are possible Wednesday, with damaging gusts focused in southeastern Virginia and North Carolina. I-20, I-26, I-40, I-64, I-73, I-74, I-77, I-81, I-84, I-85, I-87, I-89, I-90, I-91, I-93, I-95 potentially impacted.
— Southeast North Carolina and northeast South Carolina: Heat Advisories today will bring heat index values up to 107 degrees.
— Central and eastern North Carolina: Persistent thunderstorms may produce widely scattered flash flooding today, especially where storms repeatedly cross the same area. I-40, I-73, I-74, I-85, I-87, I-95 potentially impacted.
— Eastern South Carolina: A Dense Smoke Advisory continues until 10 a.m. today, with visibility of 1 mile or less and locally one-quarter mile or less making travel difficult. The Horse Island Wildfire burning in the Francis Marion National Forest near Shulerville is producing widespread dense smoke with visibility 1 mile or less across portions of northeast Berkeley County. I-26, US-52 impacted.
— Florida Gulf Coast in Gulf and Franklin counties: Tropical Storm Watches associated with Tropical Depression Two are in effect today for possible tropical-storm-force winds within 48 hours. Potential winds are 39 to 57 mph, with latest local gust forecasts up to 40 mph. Storm surge up to 2 feet is possible through Thursday morning, and additional rainfall may reach 2 to 4 inches with locally higher amounts, causing localized road flooding. US-98 potentially impacted.
— Southeast Florida, including the Miami metro area: Heat Advisory today with heat index values up to 108 degrees.
Tropical Weather Outlook:
— This morning, Tropical Depression Two is located 120 miles south of Panama City Florida, drifting slowly to the northwest. Maximum sustained winds are 35 mph. The Depression is expected to strengthen into a tropical storm today and track near the northern Gulf Coast through midweek, bringing possible tropical-storm conditions to the Florida Panhandle and Alabama coast beginning tonight. For travelers and RVers, the primary concern is heavy rain and flash flooding through Friday from western Florida to the middle Texas coast, with 2 to 4 inches widespread, locally up to 8 inches, along with possible coastal flooding, 1 to 3 feet of storm surge, and dangerous surf.
Outlook Wednesday July 22nd through Sunday July 26th:
— Wednesday, July 22: Northern Intermountain West and central Rockies from Idaho and northeastern Utah into southwestern Montana, western Wyoming, and northwestern Colorado: Heavy rain may create localized flooding and reduced visibility. Major highways potentially affected include I-15, I-80, I-84.
— Wednesday, July 22 through Thursday, July 23: From southeastern Oklahoma and eastern Texas through the Lower Mississippi Valley and central Gulf Coast into Georgia: Hazardous heat may create challenging conditions. Major highways potentially affected include I-10, I-20, I-30, I-35, I-55, I-65, I-75, I-85, I-95.
— Wednesday, July 22 through Thursday, July 23: Gulf Coast from southeastern Texas through Louisiana, southeastern Mississippi, southwestern Alabama, and northwestern Florida: Heavy rain associated with Tropical Depression 02 may create localized flooding and reduced visibility, affecting Louisiana into northwestern Florida Wednesday and southeastern Texas and southwestern Louisiana Thursday. Major highways potentially affected include I-10, I-35, I-55, I-65.
— Wednesday, July 22 through Thursday, July 23: Northeastern South Carolina, central and eastern North Carolina, and eastern Virginia: Heavy rain may create localized flooding and reduced visibility. Major highways potentially affected include I-20, I-40, I-64, I-74, I-85, I-87, I-95.
— Thursday, July 23 through Sunday, July 26: Much of Oklahoma and northern Texas: Hazardous heat may create challenging conditions. Major highways potentially affected include I-20, I-30, I-35, I-40.
— Friday, July 24 through Sunday, July 26: Northern Plains from north-central and eastern Montana and northeastern Wyoming through the Dakotas into northwestern Minnesota: Hazardous heat may create challenging conditions. Major highways potentially affected include I-29, I-90, I-94.
Extended Outlook July 27th through August 2nd:
— Monday, July 27 through Sunday, August 2: Southern California, much of the Intermountain West and Rockies, the northern and central Plains, the Upper Midwest, the middle and lower Mississippi Valley, and from Texas through the central Gulf Coast into Florida and southeastern Georgia: Extreme heat may develop, creating challenging conditions. Extreme heat is more likely Monday through Wednesday across the Southwest from southeastern California through Arizona and New Mexico, and from southeastern South Dakota and Nebraska through Kansas, Oklahoma, and much of Texas, extending into southwestern Minnesota, Iowa, Missouri, Arkansas, and nearby parts of the lower Mississippi Valley. Major highways potentially affected include I-4, I-5, I-8, I-10, I-15, I-20, I-25, I-29, I-30, I-35, I-40, I-55, I-64, I-65, I-70, I-75, I-76, I-80, I-84, I-90, I-94, I-95.
— Monday, July 27 through Thursday, July 30: Southeast from southeastern Mississippi and southern Alabama through Florida, Georgia, the Carolinas, and southeastern Virginia: Heavy precipitation may develop, creating localized flooding and difficult travel. Major highways potentially affected include I-4, I-10, I-40, I-65, I-75, I-95.
Confidence in the Extended Outlook:
Confidence is generally good in the large-scale pattern for the earlier period, though smaller-scale details become less certain later in the week. Confidence is about average for the extended period and decreases somewhat later as ensemble spread increases.
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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