"warning indicator" is correct and usable in written English.
You can use it to refer to any situation in which an alert or indication of danger, potential danger, or impending danger is presented. For example, "The dark clouds in the sky served as a warning indicator of the coming storm."
The seat belt warning indicator intermittently refused to go out even after I buckled up.
The OECD's early warning indicator for the OECD area fell by 0.5% in February, indicating the world is set for continued weak growth in the months ahead.
The NICE guidelines (2003) (UK) required adequate long-term clinical data for hip prostheses and indicated that RSA was a promising technique that might be an early warning indicator of poor long-term revision rates.
"They are an early warning indicator of climate change.
We apply recently developed early warning indicator systems to a cross-section of emerging markets.
KQIC is about 50 70% of KSIC, crack initiation should be the warning indicator of ASC structure.
We conducted a standardized Delphi process to achieve national consensus on warning indicators and recommended action plans for patients after colorectal surgery.
By using these tests as warning indicators for cardiovascular disease, we've cut deaths from that illness in half.
Early warning indicators and early warning processes need to be reassessed.
The theoretically proposed early warning indicators based on local stability therefore fail to predict the critical transition in this gene network (Menck et al., 2013).
Although the richness, evenness and diversity indices are often used to interpret the functioning of the reactor in terms of its microbial communities [ 39– 42], their use as warning indicators remains questionable [ 6].
