Forecasters have increased the probability of a tropical threat forming in the Gulf of Mexico to 50 percent, a significant rise from earlier projections. The system, designated Invest 90L, is located near northeastern Mexico and is expected to move northward, potentially nearing the Texas coast by late Tuesday or Wednesday.
Computer models suggest the system could coalesce into a tropical depression, or possibly the season's first named storm, Arthur, before making landfall. A tropical depression has maximum sustained winds of 38 mph or less, while a tropical storm has sustained winds ranging from 39 to 73 mph. This potential development brings a heightened risk of flash flooding to parts of Texas, Louisiana, and the Lower Mississippi Valley.
The National Hurricane Center (NHC) may issue tropical storm watches and warnings as early as Tuesday. However, meteorologists emphasize that it is too early to precisely determine the system's track or intensity. The NHC initially gave the disturbance a 30 percent chance of development on Monday morning, but these odds nearly doubled within hours.
A hurricane hunter aircraft is scheduled to fly from Mississippi early Wednesday to investigate the disturbance. This mission aims to provide crucial data by flying directly into the system to search for signs of a forming center of circulation. Specialized instruments called dropsondes will be released to measure wind speeds, air pressure, and temperature, which will be relayed to the NHC to refine forecasts.
Regardless of whether a tropical cyclone officially forms, meteorologists warn of significant rainfall expected across southern and eastern Texas, Louisiana, and Mississippi over the next several days. This rainfall could lead to widespread, life-threatening flash, urban, and river flooding. Alabama is also expected to experience heavy rain and potential flooding on Thursday and Friday. Gusty winds and coastal flooding are possible along the northwestern Gulf Coast.
The National Weather Service has cautioned that repeated rounds of showers and thunderstorms could cause rapidly rising floodwaters. The most significant flooding threat is focused on southeast Texas and parts of Louisiana, where considerable flash flooding is anticipated. Excessive rainfall could overwhelm drainage systems, flood roads and neighborhoods, and cause rivers and streams to overflow their banks, particularly in low-lying and flood-prone areas. Louisiana and Mississippi could see widespread rainfall totals of three to six inches, with locally higher amounts possible through at least Thursday. Residents are urged to monitor forecasts closely and be prepared to act if flash flood warnings are issued.
