Isobar-1

Isobar-1 is a weather-specialized vision-language model for radar, sounding, satellite, and forecast-map interpretation.

This release is the merged full model version of a two-stage fine-tune built on top of Qwen/Qwen3.5-27B.

What This Model Is

• Base model: Qwen/Qwen3.5-27B
• Release family: Isobar
• Release: Isobar-1
• Model type: merged multimodal causal LM / image-text model
• Intended use: weather image interpretation, technical meteorology QA, operational weather analysis assistance

Training Lineage

Isobar-1 was produced by merging a stage-2 adapter into the base model.

Training stages:

1. Broad weather VLM adaptation on deepguess/weather-vlm
2. Curated refinement on deepguess/weather-analysis-sft

The stage-2 refinement was trained from the stage-1 weather checkpoint rather than from the raw base model, so this release reflects both stages together.

Intended Use

Good use cases:

• Interpreting radar imagery
• Interpreting soundings and hodographs
• Explaining severe-weather setups
• Reading forecast maps and model visualizations
• Technical weather question answering grounded in images

Not the target for this release:

• General-purpose agent/tool calling
• Fully autonomous forecast operations
• Non-weather multimodal tasks

A later Isobar-1-Agent style release is the better place for dedicated tool-use behavior.

Limitations

• This model can still be wrong on edge cases, ambiguous imagery, and unusual regional setups.
• It is tuned for weather analysis, not guaranteed forecast verification skill.
• It should not be treated as a standalone warning or life-safety authority.
• Image quality, missing context, bad timestamps, and incomplete annotation can still degrade output quality.

Loading

from transformers import AutoModelForImageTextToText, AutoProcessor

model_id = "deepguess/Isobar-1"

processor = AutoProcessor.from_pretrained(model_id, trust_remote_code=True)
model = AutoModelForImageTextToText.from_pretrained(
    model_id,
    trust_remote_code=True,
    torch_dtype="auto",
    device_map="auto",
)

Attribution

This model is based on Qwen/Qwen3.5-27B.

The release name Isobar-1 is a downstream branding name for this fine-tuned derivative. It is not an official Qwen release.

License

This release is provided under Apache-2.0, consistent with the upstream base model license. See the upstream model card and license terms for the base model as well.