Yellow Storm Alert Issued for 12 Provinces This Wednesday, February 18

Storm warning in effect for multiple regions

A yellow alert for storms has been issued for this Wednesday, February 18, 2026, covering areas across 12 provinces. The warning applies to parts of Salta, Tucumán, Catamarca, La Rioja, San Juan, San Luis, Mendoza, Córdoba, La Pampa, Buenos Aires (excluding the City of Buenos Aires), Santa Fe, and Entre Ríos.

The alert indicates that the affected areas may experience storm conditions that are not expected to be exceptional everywhere, but could become intense in localized locations and time windows. According to the forecast, the most significant impacts are expected mainly during the afternoon and night.

What a “yellow alert” means for residents and travelers

A yellow alert is a formal notification that weather conditions may cause disruptions and that people should stay informed and take reasonable precautions. In this case, the focus is on storm development that could vary considerably from one place to another: some locations may see only brief activity, while others could face stronger or locally severe storms.

The forecast emphasizes that storms are expected to be isolated, meaning they may not occur everywhere at the same time. Even so, the alert highlights the potential for sudden changes in conditions over short distances, particularly later in the day.

Key expected impacts: rain, wind, lightning, and hail

The alert describes a set of possible storm-related hazards. These include:

• Isolated storms, with some events potentially becoming strong or locally severe
• Hail, which may accompany more intense storm cells
• Intense electrical activity, meaning frequent lightning
• Heavy rainfall in short periods, which can lead to rapid accumulation
• Wind gusts that may reach up to 80 km/h

This combination of hazards can affect daily routines in different ways. Heavy downpours over a short time can reduce visibility and create difficult driving conditions. Strong gusts can also increase the risk of falling branches or unsecured objects being blown around, particularly in exposed areas.

Rainfall totals: province-by-province ranges

Projected precipitation totals differ by region, with two main ranges outlined in the forecast.

For parts of Salta, Tucumán, Catamarca, La Rioja, San Juan, Mendoza, and San Luis, the expected accumulated rainfall is between 20 and 50 mm.

For parts of Córdoba, Santa Fe, La Pampa, Buenos Aires, and Entre Ríos, the forecast suggests higher totals, with accumulated rainfall potentially reaching 30 to 70 mm.

These figures refer to accumulated precipitation associated with storm activity, and the alert notes that much of the rainfall could fall in short bursts. That detail matters because short-duration, high-intensity rainfall can cause localized issues even when the overall daily total does not appear extreme.

Special note for high-elevation areas: snow and/or hail in the Puna

The alert also includes a specific mention for the Puna and the highest levels of the mountain range. In these higher-elevation zones, precipitation may occur mostly as snow and/or hail.

This distinction reflects how elevation can change the form of precipitation, even when lower-lying areas are experiencing rain. For people in high-altitude areas, the possibility of snow or hail can influence travel conditions and outdoor plans, especially later in the day when storm activity is expected to be more prominent.

When the strongest activity is expected

While storm development can be variable, the alert indicates that the phenomenon will affect much of the warned area primarily during the afternoon and night. That timing suggests a day in which conditions may shift from relatively calm to unstable as the hours progress.

Because storms are described as isolated, not every location will necessarily see severe conditions. However, the warning underscores that some storms could become strong or locally severe, which is why monitoring updated forecasts can be important during the second half of the day.

Areas included and excluded in the alert

The warning covers parts of 12 provinces and explicitly notes one exclusion: in the province of Buenos Aires, the alert does not include the City of Buenos Aires (CABA). That does not describe conditions outside the alert zone; it only clarifies the geographic scope of the warning as issued.

Within the provinces listed, the alert applies to “some zones,” meaning it is not necessarily province-wide. People should therefore pay attention to local forecast updates and official alert maps for the most precise location-based information.

Practical precautions during a yellow storm alert

Given the hazards highlighted—heavy rain in short periods, lightning, hail, and gusts up to 80 km/h—basic precautions can help reduce risk. The following measures are commonly considered during storm alerts:

• Plan around the timing: if possible, schedule outdoor activities earlier in the day, since the main impacts are expected in the afternoon and night.
• Be cautious with travel: heavy rainfall can reduce visibility and create water accumulation in low-lying areas.
• Secure loose objects: gusty winds can move unsecured items on balconies, patios, or worksites.
• Stay aware of lightning risk: intense electrical activity is a key feature of the forecast, so limiting exposure in open areas during storms can be sensible.
• Protect vehicles and property if hail develops: hail is listed as a possible companion to stronger storm cells.

These steps do not assume that severe weather will occur everywhere, but they align with the types of impacts described in the alert for the areas most likely to be affected.

Why rainfall ranges matter during short, intense bursts

The forecast provides expected accumulated rainfall totals, but it also stresses that precipitation may be abundant over short periods. This detail can be important for understanding how storms may be experienced on the ground.

For example, a location that receives rainfall toward the higher end of the stated ranges—such as 50 mm in the first group of provinces or 70 mm in the second—may not see that amount spread evenly across many hours. Instead, the same total could fall quickly during a strong storm cell, intensifying the immediate impact. Even areas that end the day with moderate totals can still experience brief periods of very heavy rain.

What to watch for as conditions evolve

The alert outlines several indicators that storm conditions may be intensifying locally:

• Rapidly darkening skies and a sudden increase in wind
• Frequent lightning or thunder occurring closer together
• Downpours that begin abruptly and reduce visibility
• Signs of hail within or near heavier precipitation cores

Because storms are expected to be isolated, the intensity can vary. Some areas may experience only brief rainfall, while others may see stronger wind gusts or hail. The alert’s emphasis on “some strong or locally severe” storms is a reminder that the most notable impacts may be concentrated in specific places.

Summary of the forecasted scenario

For Wednesday, February 18, a yellow storm alert is in place for parts of Salta, Tucumán, Catamarca, La Rioja, San Juan, San Luis, Mendoza, Córdoba, La Pampa, Buenos Aires (excluding CABA), Santa Fe, and Entre Ríos. The warned area may be affected by isolated storms, with some potentially strong or locally severe, especially during the afternoon and night.

Possible impacts include hail, intense electrical activity, heavy rainfall over short periods, and wind gusts that may reach 80 km/h. Expected accumulated rainfall totals range from 20–50 mm in Salta, Tucumán, Catamarca, La Rioja, San Juan, Mendoza, and San Luis, and from 30–70 mm in Córdoba, Santa Fe, La Pampa, Buenos Aires, and Entre Ríos. In the Puna and the highest mountain areas, precipitation may fall mainly as snow and/or hail.