Radar Argentina Faltantes Actualización

Totobox

Re: Radar Argentina Faltantes
@Suty @Filip_K — I traced how SMN's radar system actually works. I think this is enough to unblock it.

There is a ready-made national mosaic. The API exposes composites, not just per-radar images:
COMP_ARG (national), COMP_CEN and COMP_NOR (regional). No client-side mosaicking required.
Endpoint
GET https://ws1.smn.gob.ar/v1/images/radar/{ID} → JSON listing of available frames.

Enumerating the site's radar selector returns 22 live radar feeds, all responding 200:

19 SINARAME radars: RMA1 through RMA18 and RMA20, each as RMAn_240. Only RMA1 (Córdoba), RMA2 (Ezeiza), RMA3 (Las Lomitas), RMA4 (Resistencia), RMA5 (Bernardo de Irigoyen), RMA6 (Mar del Plata), RMA7 (Neuquén), RMA8 (Mercedes), RMA9 (Río Grande), RMA10 (Bahía Blanca), RMA11 (Termas de Río Hondo) and RMA17 (Alejandro Roca) are publicly documented by site; RMA12–RMA20 are Stage III installations.
3 INTA radars: ANG_240 (Anguil), PAR_240 (Paraná), PER_240 (Pergamino).

Frames resolve under estaticos.smn.gob.ar/vmsr/radar/ as e.g. RMA10_240_ZH_CMAX_20260816_120105Z.png. Radars that are down return a no_disponible.png placeholder rather than a 404 — worth handling explicitly.

For comparison, Windy currently renders roughly 4–6 coverage disks over Argentina.

Why automated access keeps breaking. Two obstacles, which I believe explain the intermittent failures reported here since Oct 2024:

Auth is a JWT (sub: "web", scope ROLE_USER_IMAGES, TTL 3600s). There is no auth endpoint — the token is minted server-side and injected into the /radar page HTML, then written to localStorage. The only way to obtain one is to render the page.
www.smn.gob.ar sits behind Cloudflare bot management with an active JS challenge and cf_clearance cookie, so a server-side fetch of that page will not pass.

Together: no token without rendering a challenged page, and every token expires in an hour. Importantly, ws1.smn.gob.ar is a separate host and does not appear to be challenged — the bottleneck is token acquisition alone.

The ask to SMN is therefore small and specific:

A service credential or long-lived key for ws1.smn.gob.ar/v1/images/radar/*
Cloudflare WAF allowlist for your fetcher IPs, or a token endpoint outside the challenged host
Confirmation of an acceptable polling rate

Contact: odp-aws@smn.gov.ar — SMN's Open Data Programme, active since their Feb 2022 data policy and demonstrably responsive (they already publish WRF forecasts via the AWS Open Data Sponsorship Program). The general institutional address has a poor track record in this thread. Network owner is the Subsecretaría de Recursos Hídricos, with INVAP on operations, if a formal route becomes necessary.

Why it matters: this morning the Paraná/INTA radar was live at 11:20 UTC while Windy showed nothing over Santa Fe and northern Entre Ríos. Rain Alarm displayed 24–100 mm/h cores in the same area, four minutes apart. The data exists, it is public, a national composite is already published, and 22 feeds are online. Only the access path is missing.

Still outside SMN and separately reachable: the Mendoza provincial radar (mendoza.gov.ar/contingencias/radar/).

Filip_K

Hi @Totobox, thank you for detailed description of possible ways to get access to SMN radar data.

I've sent a short message to odp-aws@smn.gov.ar regarding possible access to ws1.smn.gob.ar/v1/images/radar/* endpoint.

I'll keep you updated, if/when they reply.