A unique weather pattern is unfolding across the US this early May, with predictions indicating warmth in some areas, while others will face prolonged periods of steady rain.
This phenomenon, referred to as the “omegablock,” disrupts the usual flow of weather systems. Essentially, it leads to two major areas of precipitation for the weekend. One area stretches from the southwest through the southern plains and the Gulf Coast, while the other impacts the northeastern and mid-Atlantic regions.
“There’s a significant amount of moisture in those rain clouds,” Jane Miner, a meteorologist, explained. “This slow-moving system seems to keep us stuck in the rain.”
Forecast models suggest that the southern areas could see rainfall totals between 3 to 6 inches, with some isolated spots possibly receiving even more. Thunderstorms are likely, and some could reach severe levels.
Cities like New Orleans, Jackson in Mississippi, and Alexandria in Louisiana are pinpointed as likely receiving the heaviest rainfall in the coming week.
Many communities in these regions have already dealt with substantial rainfall over the last few weeks, increasing vulnerability. Warnings from forecasting centers indicate that rising soil saturation and river levels heighten flooding risks, especially in low-lying areas.
The peak risk for flooding is anticipated from Tuesday evening into early Wednesday, with NOAA’s Weather Forecast Center assessing this as a level 3 flash flood threat. Over 35 million people in the southern US find themselves on the WPC’s 4-point risk scale.
Conversely, the northeast stands to gain from the incoming rain. Models predict 1 to 3 inches across 95 major interstate corridors, and some local areas in New York and Connecticut could see as much as 5 inches, which could relieve some of the drought conditions affecting the East Coast.
This weather pattern typically doesn’t lead to widespread severe weather due to the absence of dynamic conditions, though isolated incidents of hail and wind gusts may occur.
In regions unaffected by low-pressure systems, temperatures are expected to vary quite a bit. The Northern Plains could hit the ’70s and ’80s, while places in the southwest, such as Las Vegas and Los Angeles, may struggle to reach average highs for early May.
“It’s going to feel like Christmas in Los Angeles and July 4th in Fargo,” noted Miner.
Looking ahead, forecasters anticipate changes in the jet stream by next weekend, which should bring a return to more typical spring weather across much of the country.
