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Planning to travel this week? Here’s what could impact your route.

• Flash flooding threatens much of the Southwest today into Thursday; central and northern Arizona also face hail over 2 inches, severe wind gusts and a couple of tornadoes this afternoon and evening.
• Flash flooding could affect streets, dry washes and low-water crossings across parts of Southern California and the Central Coast today, with isolated severe gusts or a tornado possible near the coast.
• Coastal flooding and dangerous surf threaten parts of the East Coast into Thursday; Hatteras Island could see 2–4 feet of inundation and numerous road closures.

Your route’s weather may vary from the general forecast — check your exact trip

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Significant travel weather for the next 2-3 days.

Weather Impacts Pacific:

— Eastern Nevada: Isolated strong to marginally severe thunderstorms may contain severe wind gusts and hail as thunderstorms spread across the Great Basin during the afternoon. Routes potentially affected: I-15, I-80, US-6, US-50, US-93.

— California, including a portion of the Eastern Sierra and a portion of the central and southern Sierra Nevada: Winter Weather Advisories begin late this morning. The Eastern Sierra could receive 4 to 8 inches above 8,000 feet, with up to 10 inches on the highest peaks and ridge gusts to 40 mph through Thursday afternoon; farther south, at least 4 inches is likely at high elevations, including Tioga Pass, through Thursday morning. Routes potentially affected: US-6, US-395, CA-89, CA-120, CA-168.

— California’s Central Coast, Southern California, and a small portion of central California, including the Santa Ynez Valley, Malibu Coast, Tehachapi, and Mojave Desert: Flood Watches cover parts of these areas through Thursday afternoon or evening, with possible rain rates of 0.50 to 1 inch per hour near the coast and thunderstorms farther inland. Flash flooding is possible across the Central Coast and Southern California today, with flash flooding of streets, creeks, dry washes, and low-water crossings possible. Routes potentially affected: I-5, I-10, I-15, US-101, US-395, CA-1, CA-2, CA-14, CA-18, CA-46, CA-58, CA-99, CA-138, CA-198.

— A portion of California’s Central Coast and a portion of Southern California: An isolated severe-weather threat today includes possible low-topped rotating storms near the coast, with isolated severe wind gusts and an isolated tornado possible as cells move ashore. Routes potentially affected: I-5, I-8, I-10, I-15, US-101, US-395, CA-1, CA-2, CA-14, CA-46, CA-58, CA-78, CA-198.

Weather Impacts Mountain:

— A small portion of southwestern and south-central Idaho, most of Utah, most of Arizona, and western, central, and south-central New Mexico: Today, severe thunderstorms are possible over southern Utah, most of Arizona, and a portion of western New Mexico; a heightened severe-weather threat is forecast across central and northern Arizona, where hail over 2 inches, severe wind gusts, and a couple of tornadoes are possible from midafternoon into evening. On Thursday, storms spread into southern Idaho, most of Utah, central and eastern Arizona, and western New Mexico, with a severe-weather threat focused on eastern Arizona. Friday brings an isolated severe-weather threat of isolated severe hail and wind to western, central, and south-central New Mexico. Routes potentially affected: I-8, I-10, I-15, I-25, I-40, I-70, I-80, I-84.

— Southern and central Utah, southwestern, west-central, and south-central Colorado, much of Arizona, and northwestern, north-central, and west-central New Mexico: Flood Watches cover much of this region today through Thursday, with some Colorado and New Mexico watches lasting into Friday. Southern and central Utah could exceed 3 inches of rain, central Arizona could see localized rates of 1 to 2 inches per hour, and western New Mexico could receive up to 3 inches. Dry washes, slot canyons, streams, low-water crossings, and backcountry roads may flood. Routes potentially affected: I-8, I-10, I-15, I-17, I-40, I-70.

Weather Impacts Central:

— Western, central, and south-central Nebraska, including the Republican River Valley and McCook: Patchy dense fog is occurring this morning, with visibility as low as one-quarter mile in south-central Nebraska and one-half mile or less near the Republican River Valley and McCook. The fog should dissipate by midmorning, or around 10 to 11 AM near McCook. Routes potentially affected: I-80, US-6, US-26, US-30, US-34, US-83, US-136.

Weather Impacts East:

— Eastern and a small portion of western Upper Peninsula of Michigan, northeastern, southeastern, and southwestern Lower Peninsula of Michigan, northeastern and east-central Indiana, and northern and central Ohio: Dense Fog Advisories cover portions of southern Lower Michigan, northeastern Indiana, and northern and central Ohio until 10 AM, with visibility one-quarter mile or less in most advisory areas and less than one mile in a small central Ohio area. Routes potentially affected: I-69, I-70, I-71, I-75, I-76, I-80, I-90, I-94, I-96.

— Northeastern, south-central, and southeastern Kentucky: Temperatures in sheltered rural valleys have fallen into the upper 30s, allowing patchy frost, while locally dense fog has formed near rivers. Both should clear by about 9 AM. Routes potentially affected: I-64, I-75, US-23, US-25E, US-27, US-60, US-68.

   — A small portion of central Maryland and portions of Maryland’s Eastern Shore, plus small portions of Central Virginia and portions of Tidewater, Northern Neck, and Virginia’s Eastern Shore: Coastal Flood Advisories cover these tidal areas through Thursday, with portions of Maryland’s Eastern Shore, Tidewater, and Northern Neck remaining under advisories into early Friday. Most locations could see up to one foot of inundation over low roads and waterfront property; the Maryland and Virginia Eastern Shores could see one to two feet, along with 7- to 10-foot breaking waves through Thursday.

   — Portions of central and southern New Jersey and much of Delaware: Coastal Flood Advisories are in effect today. Up to one foot of inundation is expected in low-lying coastal, bayside, and tidal areas of central and southern New Jersey and much of Delaware through 10 PM, while northern Delaware and an adjacent small portion of southern New Jersey could see up to one-half foot from 6 to 10 PM; vulnerable roads may close.

   — A small portion of Virginia’s Tidewater, including Virginia Beach: A Coastal Flood Advisory remains in effect until 3 PM, then a Coastal Flood Warning takes over through 9 AM Thursday. Inundation of one to two feet could close numerous roads and flood vehicles, homes, and businesses near tidal waterways; 7- to 10-foot breaking waves and localized beach erosion continue through Thursday. Routes potentially affected: I-64, US-13, US-58, US-60.

   — A small portion of North Carolina’s Outer Banks, including Hatteras Island and the Northern Outer Banks: A Coastal Flood Warning covers Hatteras Island through Thursday evening, with two to four feet of inundation, numerous road closures, vehicle flooding, and continued overwash along vulnerable portions of NC-12. Coastal Flood Advisories elsewhere in the covered Outer Banks call for up to one to three feet, locally up to one foot, while large breaking waves and beach erosion continue. Routes potentially affected: NC-12.

— A small portion of northeastern Florida, including the St. Johns River Basin: Coastal Flood Advisories continue through Thursday afternoon, with minor flooding of roads, lots, and parks and isolated road closures. Dangerous rip currents also affect the covered Atlantic coastal strip through late Thursday night.

— A small portion of southeastern Florida, including the Upper Florida Keys: A Coastal Flood Advisory continues through early Thursday morning. Saltwater flooding is expected on low-elevation streets and lots, with overflowing storm drains, overtopped seawalls and docks.

Tropical Weather Outlook for the next 7 days:

— A few hundred miles offshore of the mid-Atlantic United States: A storm-force non-tropical low has a 40% chance of acquiring subtropical characteristics during the next 48 hours and seven days. It should accelerate northeastward away from the United States by Friday, but high winds, coastal flooding, and dangerous surf are expected along portions of the East Coast during the next few days.

Extended Hazard Outlook

Outlook Friday, October 23rd through Monday, October 26th:

— Friday, October 23 through Saturday, October 24: From the northern and central Rockies into the northern and central Plains: Strong winds may create hazardous crosswinds for high-profile vehicles, especially near higher terrain, including Bozeman Pass and Eisenhower Tunnel. Major highways potentially affected include I-15, I-25, I-70, I-76, I-80, I-90, and I-94.

— Friday, October 23 through Sunday, October 25: New Mexico and Texas into adjacent parts of Colorado, Kansas, and Oklahoma: Heavy rain may create localized flooding or difficult travel. Major highways potentially affected include I-10, I-20, I-25, and I-40.

— Saturday, October 24 through Monday, October 26: Portions of southeastern Florida: Heavy rain may create localized flooding or difficult travel. Major highways potentially affected include I-75 and I-95.

Extended Outlook Wednesday, October 28th through Tuesday, November 3rd:

— Wednesday, October 28 through Friday, October 30: From Florida and Georgia through the Carolinas and Virginia into the coastal Mid-Atlantic and Northeast: Strong winds may develop, creating hazardous crosswinds for high-profile vehicles. Major highways potentially affected include I-4, I-10, I-20, I-40, I-64, I-70, I-74, I-75, I-76, I-80, I-84, I-85, I-87, I-90, I-91, and I-95.

— Friday, October 30 through Tuesday, November 3: Much of Oregon, most of California, and small portions of western Nevada: Heavy precipitation may develop, creating localized flooding or difficult travel. Heavy snow is possible over higher terrain in portions of northwestern California and small portions of northwestern Nevada. Major highways potentially affected include I-5 and I-80.

— Friday, October 30 through Sunday, November 1: The Southwest and southern Rockies, with extensions into northwestern Texas and Oklahoma: Heavy precipitation may develop, creating localized flooding or difficult travel. Heavy precipitation is likely across much of Arizona. Major highways potentially affected include I-10, I-20, I-25, and I-40.

— Friday, October 30 through Tuesday, November 3: Wyoming and Colorado, with small portions of southeastern Idaho and southern Montana: Heavy snow is possible and could create difficult travel over higher terrain and mountain passes. Major highways potentially affected include I-70 and I-80.

— Friday, October 30 through Tuesday, November 3: Much of Oklahoma and Texas into most of Arkansas and Louisiana: Heavy precipitation may develop, creating localized flooding or difficult travel. Major highways potentially affected include I-10, I-20, I-30, I-35, and I-40.

Confidence in the Extended Outlook:

Confidence is generally good early, with agreement on the large-scale pattern but uncertainty in the northern-stream and western-system details. Confidence decreases later as the pattern becomes less amplified and precipitation guidance varies.

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Your route’s weather may vary from the general forecast — check your exact trip

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Weather Maps and National Outlooks

For current NWS hazards, severe-storm and hurricane outlooks, heavy-rain risk, wind, smoke, heat/winter risk, and other always-updating weather graphics, visit:

Access to real-time road information:

Phone numbers and websites for road conditions in all 50 states. Courtesy of the Cheyenne WY Weather Forecast Office

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