Uncommon Atmospheric River Poised to Impact Southeastern U.S.

According to the National Oceanic and Atmospheric Administration, an unusual atmospheric river is anticipated to make landfall in Florida and nearby southeastern states. Typically, such weather phenomena affect western regions of the United States.

The atmospheric system involves a jet stream that will penetrate areas over the Gulf of Mexico not usually reached by it. Beginning this weekend, the weather service forecasts significant rain until Tuesday, with certain places potentially experiencing up to 12 inches.

This weather pattern will predominantly influence Florida, along with Tennessee, Georgia, South Carolina, and North Carolina. The probability of substantial rainfall increases during the weekend, leading to possible flood conditions by Monday and Tuesday.

Atmospheric rivers are powerful streams of water vapor traveling across the atmosphere, often originating from the Gulf of Mexico or Caribbean. These events primarily occur in the Western United States, particularly benefiting California with winter rainfalls.

Andrew Hazelton, a scientist at the University of Miami affiliated with NOAA, explained that although these phenomena are common in California, they occasionally divert due to a 'cutoff low.' This occurs when a jet stream is isolated from its typical path, forming a loop and rerouting it eastwards.

Interestingly, the upcoming atmospheric river could aid areas in the Southeast, like Central Florida, which has recently endured droughts. Despite an expected increase in rain, excessive rainfall within brief periods poses risks of flooding and flash floods.

Hazelton advises vigilance regarding flood potentials during such intense rainfall. High water levels could affect streams and low-lying regions, necessitating standard safety measures against flooding.

The public should heed flood warnings, avoiding attempts to navigate floodwaters. Even shallow flooding can be hazardous. Ensure personal safety by remaining on elevated ground until water levels recede.