The i-5 snow wind closure threat is expanding across the western United States as a powerful late-season Pacific storm brings heavy mountain snow, hurricane force gusts and whiteout travel conditions, forecasters say.
Meteorologists report active high wind warnings centered on the Grapevine and Owens Valley, with gusts expected to reach 60 to 70 miles per hour in some desert and mountain corridors, conditions strong enough to overturn high profile vehicles and trailers.
The system is already producing heavy snow in the northern Rockies and Cascades, with the Teton Range in Wyoming forecast to receive up to 20 inches, and the Weather Prediction Center data showing more than an 80 percent probability that Winter Storm Warning criteria will be met in parts of the Mountain West.
Forecasters say western Colorado, northern Utah, southwest Wyoming, northwestern Wyoming and western Montana are most likely to see formal warnings issued within hours as colder air pushes deeper into the Rockies.
Road Impacts Advisories And Travel Guidance
Transportation officials and Caltrans are closely monitoring key freight corridors, warning that Interstate 5 through Tejon Pass is particularly vulnerable to crosswinds that have historically prompted roadway shutdowns, rollovers and chain controls.
Caltrans reports closures for specific southbound connectors in the Southern California area due to construction and nightly maintenance, and it lists multiple high wind advisories across the Los Angeles, Kern and Central California regions, advising that travel is not recommended for campers, trailers or permit loads.
Officials warn other interstates may also face severe disruptions, with I-70 subject to chain laws, reduced visibility, spinouts and possible full closures in Colorado, and I-80 at risk from blowing snow and crosswinds across spring storm prone corridors.
Forecasters and travel authorities urge drivers to avoid unnecessary mountain travel, carry tire chains, check tire pressure before climbing into colder elevations, avoid cruise control on snow or slush, increase following distance, and monitor live highway conditions through National Weather Service, Caltrans social media and QuickMap real-time travel information.
