Does "avisar" require subjunctive in the subordinate clause?

[laepelba]

The sentence in my book as follows, and I am to choose indicative vs. subjunctive: Los científicos avisan que los cambios meteorológicos continúan/continúen.

The answer is indicative: continúan

From what I've studied so far, the following types of main clauses require the subjunctive:
1) Deseo o necesidad (como querer, esperar, etc.)
2) Emociones, gustos y preferencias (como alegrarse, sorprenderse, molestarse, temerse, etc.)
3) Influencia (como recomendar, proponer, ordenar, obligar, permitir, prohibir, oponerse, etc.)
4) Duda y posibilidad (como dudar, ser posible, posiblemente, etc.)
5) Certeza, pensamientos y creencias (como no creer, no pensar, etc.)
6) Juicios de valor (como parecerse bueno/malo, ser justo/importante, etc.)

Now, I've bolded #3. To me, avisar seems like a verb of influence. BUT ... is it sometimes used with an indicative subordinate clause and sometimes with a subjunctive subordinate clause?

For example, would the following two sentences be correct?
Indicative: Mi jefe nos avisó que había una reunión esta mañana. (Indicative because he's merely notifying us that there was a meeting this morning.)
Subjunctive: Mi jefe nos avisó que la reunión de lunes sea larga. (Subjunctive because he's warning us that the meeting will be long.)

Is my thinking here correct?