Updated

Updated · Fox Weather · Oct 7

Hurricane Isaias Targets Gulf Coast as Rachel's Remnants Threaten 2-Coast Flooding

Updated

Updated · Fox Weather · Oct 7

Hurricane Isaias Targets Gulf Coast as Rachel's Remnants Threaten 2-Coast Flooding

Q: What bizarre atmospheric anomaly is causing tropical systems to batter both U.S. coasts simultaneously for only the third time since 1963?

The anomaly is a rare split-flow pattern in the upper atmosphere: a broad dip in the jet stream over the western United States is pulling the remnants of Pacific Hurricane Rachel northeast into California and the Southwest, while separate steering currents and very warm Gulf waters are driving Atlantic Hurricane Isaias toward the northern Gulf Coast. Forecasters say the two storms are not directly interacting. What makes this so unusual is that the atmosphere is simultaneously supporting tropical moisture transport from the eastern Pacific into the West while also allowing a strengthening Gulf hurricane to move into the Southeast. In practical terms, the western jet-stream trough is acting like a conveyor belt for Rachel’s moisture, redirecting it inland instead of letting it remain over the Pacific. That combination — a Pacific moisture plume aimed at the West at the same time an Atlantic basin hurricane threatens the Gulf Coast — is why this is being described as a rare “tale of two coasts.” Historical comparisons cited in the coverage indicate it would be only the third such near-simultaneous U.S. East/West Coast tropical impact since 1963.

3 articles · Updated · Fox Weather · Oct 7

Hurricane Isaias became the first Atlantic hurricane of 2026 and is forecast to make landfall late Friday or early Saturday between Gulfport, Mississippi, and Panama City, Florida.
Warnings are already posted along parts of the northern Gulf Coast, where Isaias could bring heavy rain, damaging winds, life-threatening storm surge and tornadoes as it accelerates north.
A Level 3 of 4 flash-flood risk covers Mobile and the Florida Panhandle west of Panama City Friday, while a Level 2 severe-weather risk Saturday highlights tornado potential in southern Alabama and the Panhandle.
Rachel is expected to lose tropical characteristics, but its moisture could reach Southern California and the Southwest this weekend, with 2 to 3 inches possible around Las Vegas and Phoenix under a Level 2 of 4 flood threat.
The dual setup could be only the third since 1963 in which tropical systems affect both U.S. coasts at nearly the same time.