The National Meteorological Service (SMN) raised the storm alert to orange for the Buenos Aires Metropolitan Area (AMBA), according to La Nación and Crónica. Both sources agree that the categorization change occurred on Sunday, after the agency initially maintained a yellow warning. The orange alert implies, according to La Nación’s text, that «dangerous meteorological phenomena are expected for society, life, property, and the environment.»
What the documents say about Sunday’s storms
La Nación details that the SMN anticipated strong storms from 2:00 PM, with westerly winds and gusts that could reach 100 km/h. Crónica mentions gusts that could exceed 100 kilometers per hour. Both sources agree on the possible fall of hail and intense precipitation in short periods.
La Nación quotes Fabián García, provincial director of Civil Defense, who told Todo Noticias that «between 15 and 20 millimeters fell on average in the province of Buenos Aires during the afternoon» and that Pergamino recorded 30 millimeters. Crónica, on the other hand, attributes to an official statement from the Buenos Aires City Government the forecast of «accumulated precipitation values between 20 and 50 millimeters.» La Nación had previously reported that the accumulations forecast by the SMN were between 30 and 50 millimeters, although those marks could vary.
The differences in precipitation ranges are not minor. La Nación reports an estimate from Meteored for the AMBA of between 12 and 20 millimeters, while the SMN forecast 30 to 50 millimeters. Crónica does not mention Meteored or offer an alternative range. Neither source allows establishing which of the values was finally verified.
Monday: Yellow alert for wind
La Nación reports that for Monday, September 21, a yellow alert for wind will be in effect. The SMN anticipates westerly winds that will rotate to the south, with speeds between 30 and 45 km/h and gusts that could exceed 70 km/h. Crónica does not mention Monday’s alert or the conditions forecast for that day.
La Nación adds that in the city of Buenos Aires, a minimum temperature of 13°C and a maximum of 17°C is forecast for Monday, with chances of isolated rains during the early morning and partly cloudy skies during the morning and afternoon. For the night, it forecasts a temperature of 14°C. Crónica does not include this data.
El Niño: an attribution that appears in only one source
Crónica states that «specialists point out that this type of climatic event is linked to the strengthening of the El Niño phenomenon.» It does not identify the specialists or cite a document from the SMN or official agency that supports that attribution. La Nación, on the other hand, associates the change to «the advance of a cold front from the southwest» and cites Meteored, a specialized site, as the source of that explanation. Neither source allows confirming a causal relationship between El Niño and this Sunday’s storms.
La Nación also mentions that the storm warning reached sectors of Buenos Aires, La Pampa, San Luis, Córdoba, and Santa Fe, and that in the Mendoza mountain range an orange alert was in effect for snowfall with accumulations that could reach 90 centimeters. Crónica does not include the geographic scope of the alert or the snowfall in the mountain range.
Recommendations and precautionary measures
Crónica lists recommendations from civil protection agencies: avoid circulating on public roads if not strictly necessary, do not put out garbage bags to prevent clogging of drains, remove objects from balconies and terraces that could be blown away, and stay away from trees and light poles. La Nación mentions that the SMN issues a series of recommendations but does not detail them in the available material.
La Nación also reports that the temperature drop will continue on Tuesday, with a minimum of 7°C and a maximum of 15°C for CABA, and that on Wednesday values between 9°C and 18°C are expected. From Thursday, an increase is forecast, with a minimum of 16°C and a maximum of 25°C. Crónica does not offer an extended forecast.
What each document establishes and what remains open
| Document | What it establishes | What it does not establish | Open questions |
|---|---|---|---|
| La Nación (secondary source) | SMN orange alert for storms for the AMBA; gusts up to 100 km/h; forecast accumulations of 30 to 50 mm; yellow alert for wind for Monday; statements by Fabián García; extended forecast. | Does not confirm whether the accumulations were verified; does not detail the SMN recommendations; does not mention El Niño. | Were the forecast 30 to 50 mm reached? What was the real impact of the gusts? |
| Crónica (secondary source) | SMN orange alert for severe storms; gusts that could exceed 100 km/h; accumulations of 20 to 50 mm according to the Buenos Aires City Government; civil protection recommendations; attribution to El Niño. | Does not mention the wind alert for Monday; does not cite SMN sources for the accumulations; does not identify the specialists who link the event to El Niño. | What is the official source of the 20 to 50 mm? Which specialists attribute the event to El Niño? |
The data worth following
The difference between the accumulations forecast by the SMN (30 to 50 mm, according to La Nación) and those reported by the Buenos Aires City Government (20 to 50 mm, according to Crónica) does not allow establishing a single value. Nor is there agreement on the causal attribution: La Nación speaks of a cold front and cites Meteored; Crónica mentions El Niño without identifying sources. The data to follow is the official SMN update on recorded accumulations and the persistence or lifting of the yellow wind alert for Monday.
Value module: no unit conversions or calculations are performed because the sources do not provide conversion factors or quotes. Values are kept in millimeters and kilometers per hour as they appear in the material.
Fuentes consultadas
El Sereno contrastó las fuentes enlazadas y añadió contexto, comparación o análisis documental. Las fuentes primarias están identificadas. La nota no se presenta como investigación de campo ni como entrevista propia, salvo indicación expresa.
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