Yellow Storm Alert Issued for 12 Provinces This Wednesday, February 18
Yellow alert for storms across multiple regions
A yellow alert for storms has been issued for this Wednesday, February 18, 2026, covering parts of 12 provinces: 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 warning highlights the possibility of unstable weather developing over a wide portion of the country, with the most significant impacts expected later in the day.
The alert level signals that storms may bring potentially disruptive conditions in the affected areas. While the forecast emphasizes that storms will be isolated, it also notes that some could become strong or locally severe. This combination—scattered coverage but the potential for intense episodes—means that weather conditions may vary sharply from one location to another, even within the same province.
When the strongest activity is expected
According to the forecast details included in the alert, the main window for storm development is expected during the afternoon and night. This timing is important for residents and travelers planning activities later in the day, as conditions can deteriorate quickly when storms form, especially when they are accompanied by strong winds, intense rainfall over short periods, and hail.
Because the storms are described as isolated, not every locality within the alert area will necessarily experience the same intensity. However, the warning indicates that the environment is favorable for some storms to strengthen considerably. In practical terms, this can mean a quiet afternoon in one town while another nearby location experiences heavy downpours, frequent lightning, or damaging gusts.
Main hazards: heavy rain, wind gusts, lightning and hail
The alert outlines several key hazards associated with the expected storms. The first is heavy rainfall concentrated in short periods. This type of precipitation can overwhelm drainage systems and create rapid accumulations of water. The second hazard is strong wind gusts, which may reach up to 80 km/h. Such gusts can make driving difficult, especially on open roads, and can also cause localized damage where the strongest cells develop.
In addition, the storms may feature intense electrical activity, meaning frequent lightning. Lightning is one of the most dangerous elements of thunderstorms and can occur even when rainfall appears moderate. The alert also notes the possibility of hail. Hail can range in size and intensity depending on storm strength, and even brief hail episodes can create hazardous conditions.
In summary, the expected storm environment includes:
Isolated thunderstorms, some potentially strong or locally severe
Hail
Intense electrical activity (frequent lightning)
Abundant rainfall in short periods
Wind gusts that may reach 80 km/h
Expected rainfall totals by province group
The alert provides estimated ranges for accumulated precipitation, which differ by region. For Salta, Tucumán, Catamarca, La Rioja, San Juan, Mendoza and San Luis, forecast rainfall totals are expected to fall between 20 and 50 millimeters. For Córdoba, Santa Fe, La Pampa, Buenos Aires and Entre Ríos, the projected totals are higher, with expected accumulations between 30 and 70 millimeters.
These figures represent accumulated precipitation during the period of storm activity and may be reached through one or more storm events. Because the rainfall is expected to occur in short bursts, localized totals can be significant where a strong storm remains over an area for longer than usual.
Rainfall ranges highlighted in the warning include:
20–50 mm: Salta, Tucumán, Catamarca, La Rioja, San Juan, Mendoza, San Luis
30–70 mm: Córdoba, Santa Fe, La Pampa, Buenos Aires (excluding the City of Buenos Aires), Entre Ríos
High-altitude areas: precipitation may fall as snow and/or hail
The alert also draws attention to the high-elevation sector of the Andes, particularly in the puna region and the highest mountain levels. In these areas, precipitation may fall mainly as snow and/or hail. This detail matters because the form of precipitation can change rapidly with altitude, and conditions in high mountain environments can be markedly different from surrounding lower elevations.
When precipitation falls as snow or hail at higher elevations, it can affect visibility and create slippery surfaces. Even when lower areas are experiencing rain, the highest zones can face wintry precipitation, underscoring the need for careful monitoring of local conditions in mountainous terrain.
What “isolated storms” can mean on the ground
The wording of the alert emphasizes “isolated storms,” a term that can sometimes be misunderstood. Isolated does not necessarily mean weak; it refers to coverage—storms that develop in scattered locations rather than forming a continuous band affecting everyone at once. In practice, this can lead to sharp contrasts within short distances.
For example, one community may see only brief showers while another, just a few kilometers away, experiences a strong thunderstorm with hail and wind gusts approaching the upper end of the forecast range. This is why the alert highlights the potential for some storms to be strong or locally severe even if the overall pattern is not uniform.
Areas included in the alert
The list of provinces under the yellow alert is extensive and spans several regions. The affected provinces are 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 warning applies to certain zones within these provinces rather than necessarily covering each province in its entirety.
The explicit note that the alert for Buenos Aires does not include the City of Buenos Aires is a key geographic clarification. People in the province should still pay attention to local forecasts and updates, as the alert is tied to specific areas and the evolution of storms during the afternoon and night.
Why the alert level matters
A yellow alert is designed to flag weather that can be potentially disruptive and that warrants attention, particularly for outdoor plans and travel. The combination of heavy rain in short periods, lightning, hail, and gusts that can reach 80 km/h is significant, even if storm coverage is uneven. The alert is especially relevant for those who may be commuting later in the day, working outdoors, or traveling across provinces where conditions can change quickly.
Because the forecast points to the afternoon and night as the main period of concern, it is a reminder that weather impacts may intensify after midday rather than being limited to early morning hours. In many cases, thunderstorms can develop rapidly, and the most intense conditions may occur within a relatively short time frame.
How to use the forecast information
The alert provides two practical pieces of guidance: the expected hazards and the rainfall ranges. Together, these help set expectations for what may happen and where impacts may be more likely. Areas with higher forecast rainfall totals—30 to 70 mm—may be more prone to significant downpours during the strongest storms, while areas with 20 to 50 mm still face the possibility of intense rain bursts, lightning and gusty winds.
In mountainous zones, the mention of snow and/or hail at the highest elevations is a reminder that conditions can vary dramatically with altitude. Travelers and residents in those regions should consider that precipitation type can shift even within the same general weather system.
Key points at a glance
A yellow storm alert is in effect for Wednesday, February 18, 2026, for parts of 12 provinces.
Storms are expected to be isolated, but some may be strong or locally severe.
Main hazards include hail, intense lightning activity, heavy rainfall in short periods, and wind gusts up to 80 km/h.
Forecast rainfall totals: 20–50 mm in Salta, Tucumán, Catamarca, La Rioja, San Juan, Mendoza and San Luis; 30–70 mm in Córdoba, Santa Fe, La Pampa, Buenos Aires (excluding the City of Buenos Aires), and Entre Ríos.
In the puna and the highest mountain areas, precipitation may fall mainly as snow and/or hail.
The most significant impacts are expected during the afternoon and night.
With a wide geographic footprint and the potential for sudden, intense storm episodes, the yellow alert serves as a signal to stay attentive to evolving conditions throughout the day, particularly later in the afternoon and into the night when the strongest activity is expected.