The National Hurricane Center is monitoring a disturbance near the Gulf of Mexico that could become the first tropical system of the 2026 Atlantic hurricane season.

An area of low pressure is producing broad, loosely organized thunderstorms over northern Mexico and southern Texas. The National Hurricane Center designated this area of interest as Invest 90L early Monday afternoon.

Invest, short for Investigation, is the first classification given to potential tropical systems. This designation allows meteorologists to apply specialized computer models to improve predictions of tropical systems and assess what the disturbance may do next.

The core of the storm is expected to drift east on Tuesday, remaining weak and loosely organized as it moves over land. However, the system may briefly track out into the Gulf south of Texas on Wednesday and Thursday and could strengthen as it draws on the heat and humidity of the open waters.

The odds of a tropical depression or storm developing by the middle of the week have increased to nearly 50-50. The National Hurricane Center says there is a 40% chance of a tropical system developing in the next 2 days and a 50% chance in the next 7 days.

If the system reaches tropical storm strength, it would be named Arthur, the first on the list of storm names for the 2026 Atlantic season. On average, the first named storm of the Atlantic hurricane season occurs on June 20th.

But regardless of whether a tropical system is declared, South Texas and Louisiana will be bracing for days of high winds and flash flooding. Over a foot of rain is possible in localized areas of southern Texas, much of central Louisiana, and parts of Mississippi. The Weather Prediction Center issued a moderate 3 out of 4 risk of flash flooding through Thursday.

A hostile and potentially record-breaking El Niño could mean a quieter hurricane season this year. El Niños are associated with less Atlantic tropical activity due to wind shear in the upper atmosphere, which tears storms apart or keeps them lopsided. This El Niño is increasingly likely to become the strongest event in recorded history.

Hurricane Hunters will be deployed to Invest 90L to measure wind and pressure and investigate its structure. The first reconnaissance flight is scheduled to arrive at the storm at 1 a.m. CT on Wednesday. The National Hurricane Center says Tropical Storm Watches or Warnings could be issued as early as Tuesday.