Context:

An unusual atmospheric river event is predicted to bring significant rainfall to the Southeastern United States, diverging from the typical pattern that affects the Western U.S. This event, characterized by a concentrated area of water vapor, is expected to cause 4 to 6 inches of rain across states like Florida, Tennessee, Georgia, South Carolina, and North Carolina, with isolated areas potentially receiving up to 12 inches. The atmospheric river is forming due to a 'cutoff low,' where the jet stream is diverted into a closed-off low-pressure system, leading to increased chances of flooding. While this could benefit drought-stricken areas, particularly in Florida, the rapid accumulation of rain poses risks of flooding and flash floods. Residents in affected regions are advised to exercise caution, follow safety measures, and remain updated on weather forecasts.

Dive Deeper:

• A jet stream over the Gulf of Mexico is expected to reach the Southeastern U.S., a region it doesn't typically impact, bringing about an unusual atmospheric river event. This system is predicted to cause widespread rainfall beginning over the weekend and continuing into early next week.

• The National Weather Service forecasts significant rainfall, with most areas expecting 4 to 6 inches and isolated spots up to 12 inches of rain across several Southeastern states, including Florida, Tennessee, Georgia, South Carolina, and North Carolina.

• Atmospheric rivers are concentrated bands of water vapor that transport substantial amounts of moisture through the atmosphere, usually affecting the Western U.S., especially California, during the winter. However, this event diverges eastward due to a 'cutoff low' that alters the typical jet stream path.

• The anticipated rainfall could be beneficial for areas experiencing drought, particularly in Central Florida, which had a dry winter. Despite the potential benefits, there is a significant risk of flooding and flash floods due to the heavy and rapid rainfall.

• Safety precautions are advised for residents in flood-prone areas, as even a small amount of water can be dangerous. People are reminded to avoid driving or walking through flooded areas and to stay on high ground until conditions improve.

• Andrew Hazelton, an associate scientist at the University of Miami, emphasizes the importance of monitoring the weather closely, as the situation could develop into a more serious flooding threat, depending on the intensity and duration of the rainfall.

• Regular updates and advisories from the National Weather Service and local authorities are crucial, as the atmospheric river event unfolds, to ensure public safety and preparedness in the affected regions.