The Servicio Meteorológico Nacional (SMN) has issued a widespread weather warning for Saturday, April 4, placing seven Argentine provinces under an alerta amarilla por tormentas en 7 provincias. The alerts cover a significant corridor of the country, stretching from the northern highlands to the central plains, as a system of unstable air brings the threat of heavy rainfall and high-velocity winds.
Even as the yellow alert serves as a general warning for potential danger, the SMN has escalated the risk level to orange for specific sectors of Córdoba, Catamarca, and La Rioja. In these areas, the weather service expects more severe phenomena, including higher precipitation totals and stronger wind gusts that could impact local infrastructure, and travel.
For residents in the affected regions, the timing of the storms varies. The instability is expected to trigger activity in the afternoon for Catamarca, La Rioja, Córdoba, and San Luis, before expanding to include Jujuy, Salta, and Tucumán by the evening. This progression means that while some provinces will face the brunt of the weather during daylight hours, others will encounter the most severe conditions after dark.
Understanding the Alert Levels: Yellow vs. Orange
In the SMN’s standardized warning system, a yellow alert indicates a phenomenon that could become dangerous, requiring residents to remain vigilant. For the seven provinces under this status, the forecast includes storms of varying intensity. These systems are expected to produce heavy rainfall over short periods, occasional hail, and frequent electrical activity.
Wind is a primary concern for those under the yellow alert, with gusts predicted to reach up to 80 km/h. In terms of water accumulation, the SMN estimates precipitation values between 30 and 60 mm, which can lead to localized pooling and runoff in urban areas.
Zonas bajo alerta por tormentas (Captura SMN).
The orange alert, however, denotes a higher level of risk, where the phenomenon is expected to be dangerous. In the orange-zoned areas of Córdoba, Catamarca, and La Rioja, the SMN warns of strong and locally severe storms. These are characterized by significantly more abundant precipitation, with estimated accumulations between 40 and 90 mm—though the agency notes these figures could be exceeded in specific locations.
The wind risk also increases under the orange alert, with gusts potentially hitting 90 km/h. Combined with frequent lightning and the possibility of hail, these conditions pose a greater threat to outdoor activities and structural integrity.
Zonas bajo alerta naranja (Captura SMN).
Regional Breakdown and Timeline
The geographic scope of this weather event is broad, affecting both the Northwest (NOA) and central regions of Argentina. The timing of the alerts suggests a system moving across the interior, with the following schedule provided by the SMN:
| Time of Day | Affected Provinces |
|---|---|
| Afternoon | Catamarca, La Rioja, Córdoba, San Luis |
| Night | Jujuy, Salta, Tucumán, Catamarca, La Rioja, Córdoba, San Luis |
The inclusion of the northernmost provinces—Jujuy, Salta, and Tucumán—during the nighttime hours suggests that the atmospheric instability will persist and shift north, potentially complicating travel and emergency response during the late hours of Saturday.
Safety Protocols and Recommendations
Given the risk of flash flooding and wind damage, the SMN has issued specific safety guidelines tailored to the severity of the alert. These measures are designed to reduce the risk of injury and property damage during the peak of the storm.
Precautions for Yellow Alert Zones
Residents in yellow alert areas are encouraged to limit unnecessary outdoor movement. Practical steps include cleaning drains and gutters to prevent street flooding and avoiding taking out trash, which can be swept into drainage systems and cause blockages. The SMN also advises securing or removing objects that could be carried away by 80 km/h winds and seeking immediate shelter in a sturdy building or closed vehicle if caught outdoors.
Precautions for Orange Alert Zones
For those in higher-risk orange zones, the guidelines are more stringent. The agency stresses the importance of following instructions from local authorities and remaining inside closed structures, such as homes or public buildings. Residents are urged to stay away from flood-prone areas and avoid entering flooded streets, as current levels can be deceptive and dangerous.
the SMN recommends preparing an emergency kit that includes:
- Potable water and non-perishable food.
- A first-aid kit.
- A battery-powered radio and flashlight.
- Fully charged mobile phones.
We see also advised to have the contact numbers for local Civil Defense, Fire Departments, and Police readily available.
Infrastructure and Environmental Impact
Storms of this magnitude in central and northern Argentina often lead to challenges for local infrastructure. The predicted rainfall—up to 90 mm in some areas—can quickly saturate the soil, increasing the risk of landslides in mountainous regions like Catamarca and Jujuy. In urban centers, particularly in Córdoba and San Luis, the combination of heavy rain and wind frequently results in power outages and disrupted public transport.
The SMN’s focus on “abundant precipitation in short periods” is a critical detail; this often leads to “flash floods,” where water levels rise faster than drainage systems can manage, potentially trapping vehicles or flooding ground-floor residences.
The weather service continues to monitor the atmospheric pressure and humidity levels to determine if these alerts will be extended into Sunday. Residents are encouraged to check the official SMN alerts page for real-time updates and changes in alert levels.
The next critical checkpoint for the region will be the Sunday morning forecast, which will indicate whether the system has cleared the northern provinces or if the instability will linger into the start of the work week.
Do you have updates from your area or questions about the current alerts? Share your experience in the comments or share this guide with others in the affected provinces.
