The National Hurricane Center said Monday that a weather disturbance over northeastern Mexico now has a 50% chance of becoming a tropical cyclone over the next week, with the most immediate concern focused on heavy rain and flooding rather than wind.
As of 1 p.m., the trough of low pressure was still producing a large, disorganized area of showers and thunderstorms while it remained inland. But meteorologists said the system could re-emerge over the northwestern Gulf late Tuesday or Wednesday, and if it does, conditions could briefly allow it to strengthen into a short-lived tropical storm between Wednesday and Thursday.
That is why the forecast matters today. The National Hurricane Center put the odds of cyclone formation at 40% over the next 48 hours and 50% over the next seven days, and warned that Tropical Storm Watches or Warnings may be needed as early as Tuesday. Residents and interests across southern and eastern Texas, as well as portions of Louisiana and Mississippi, were urged to prepare for heavy weather before the system gets back over water.
The threat is already showing itself in Texas. Heavy rain was falling across Houston on Monday as Southeast Texas remained under a Flood Watch through Thursday, a sign that the first round of impacts may arrive before any organization into a named system. Gusty winds and coastal flooding were also possible along parts of the northwestern Gulf Coast.
The friction point in the forecast is straightforward: the disturbance was not expected to develop while inland, but its return over the Gulf could give it a narrow window to organize. Even then, the strongest signal from forecasters is not for a long-lived storm but for several days of intense rainfall that could trigger widespread, life-threatening flash, urban and river flooding. The unanswered question is not whether the area will see weather, but how much rain will fall before the system either strengthens or falls apart again.
