Wet weather hitting nation’s two largest freight markets (with forecast video)

Freight flow delays possible in Atlanta and southern California

Image: Jim Allen/FreightWaves

Periods of rainfall today and tonight may slow down freight flows just a bit in the nation’s two largest markets – Atlanta, Georgia and Ontario, California – as well as Los Angeles, the sixth-largest. The heaviest rainfall that may cause the most delays will be in California.

Set up

A cold upper-atmospheric low pressure system off the West Coast will continue to interact with subtropical Pacific moisture, generating moderate to locally heavy rainfall across southern California today through tonight.

SONAR Critical Events and radar: Tuesday, Mar. 10, 2020, 10 a.m. EST

There’s a threat of thunderstorms, too, including the possibility of strong storms. The greatest threat will be during the afternoon and evening hours when the atmosphere will become more unstable. Any thunderstorms that develop will have the potential to produce brief downpours, with rainfall rates of one-half inch to one inch per hour. In addition, thunderstorms will be capable of producing small hail, wind gusts up to 45 mph, and dangerous cloud-to-ground lightning. Conditions will also be favorable for isolated waterspouts over the coastal waters today, which can move onshore as small tornadoes.

The National Weather Service (NWS) has issued a flash flood watch for the following areas across interior southern California – Death Valley National Park, the eastern Sierra Nevada Slopes,  Owens Valley, the western Mojave Desert, the White Mountains of Inyo County, Fort Tejon, Indian Wells Valley, the Kern County desert, Lake Isabella and the Tehachapi area. The NWs may add other areas to the watch as the storm progresses.

https://vimeo.com/396682173

East of the Mississippi, a cold front is producing rainfall of varying intensities from the lower Mississippi Valley to the Northeast. Most of this wet weather should fade by late afternoon or early evening and will not likely result in flash flooding in most areas, including Atlanta.

Impact on freight

There’s plenty of freight in the Atlanta, Ontario and Los Angeles markets for carriers to grab. FreightWaves SONAR has an easy way to see this, using a scale called the Outbound Tender Volume Index (OTVI). This is an index value which moves in proportion to the total observable outbound tender volume of a market. Out of 135 freight markets nationwide, Atlanta, Ontario and Los Angeles (OTVI.ATL, OTVI.ONT, OTVI.LAX) rank first, second and sixth, respectively, in terms of outbound volume levels.

SONAR ticker: OTVI Tree Map

The SONAR tree map directly above shows this. Markets with the highest outbound volumes are in the largest squares and rectangles on the left; lowest values are toward the right side. The top number is the percentage change over a chosen time period – in this case, since yesterday – and the bottom number is the market’s current index value. Atlanta, Ontario and Los Angeles are circled in red.

While there’s abundant freight in these areas, it could take drivers longer than usual to get out of these markets with loads, or into them to pick up loads. Let’s face it – Atlanta traffic is bad enough on a dry day; and heavy rain in southern California can result in road blocks due to potential flooding and mudslides. Delays should be fairly minor and short-term, but are likely. The silver lining – it’s not snow or ice!

Have a great day, and be careful out there!

Upcoming FreightWaves Events
Compliance

Brokerage Compliance Symposium

The day before F3. Every compliance issue you face - fraud exposure, carrier liability, FMCSA rules, cargo theft, insurance gaps - navigated by attorneys and operators defining best practices in a changing industry.

October 26, 2026
The Signal at Chattanooga Choo Choo • Chattanooga, TN
Register Now
Awards

F3 Awards Dinner

The night before F3. FreightTech100 companies honored. FreightTech 25 and Shipper of Choice winners revealed live. Cocktail reception into dinner and live music - 300 industry leaders in one purpose-built room.

October 26, 2026
The Signal at Chattanooga Choo Choo • Chattanooga, TN
Register Now
FreightTech

F3: Future of Freight Festival

Industry-defining keynotes, rapid-fire technology demos, and industry leaders networking in experiences across Chattanooga - plus the inaugural F3 Awards Dinner featuring the FreightTech and Shipper of Choice reveals.

October 27, 2026 – October 28, 2026
The Signal at Chattanooga Choo Choo • Chattanooga, TN
Register Now
Compliance Brokerage Compliance Symposium Oct 26 • The Signal at Chattanooga Choo Choo • Chattanooga, TN

The day before F3. Every compliance issue you face - fraud exposure, carrier liability, FMCSA rules, cargo theft, insurance gaps - navigated by attorneys and operators defining best practices in a changing industry.

The Signal at Chattanooga Choo Choo • Chattanooga, TN Register Now
Awards F3 Awards Dinner Oct 26 • The Signal at Chattanooga Choo Choo • Chattanooga, TN

The night before F3. FreightTech100 companies honored. FreightTech 25 and Shipper of Choice winners revealed live. Cocktail reception into dinner and live music - 300 industry leaders in one purpose-built room.

The Signal at Chattanooga Choo Choo • Chattanooga, TN Register Now
FreightTech F3: Future of Freight Festival Oct 27 – Oct 28 • The Signal at Chattanooga Choo Choo • Chattanooga, TN

Industry-defining keynotes, rapid-fire technology demos, and industry leaders networking in experiences across Chattanooga - plus the inaugural F3 Awards Dinner featuring the FreightTech and Shipper of Choice reveals.

The Signal at Chattanooga Choo Choo • Chattanooga, TN Register Now