Barometric Pressure

Thought Experiment:

Let's say that there was a man in ancient Israel that had a device which could measure barometric pressure to some degree and perhaps other instruments. Let's also say that doing so allowed him to foretell storms with shocking accuracy considering the methods available in Israel at the time.

Let's further presume that this man was wise and well-known for his kindness and truly only wanted to help his fellow man.

Now let us imagine that this man determined that a horrendous storm was coming and that any crops left in the earth would be destroyed by the imminent storm which his devices indicate will arrive in 24 hours.

Now let us imagine that it was Friday morning and this man knows that given the time of year, the prices of grain and produce from neighboring countries, and the current sociopolitical landscape a devastating crop-destroying storm would be beyond the savings of the nation and result in starvation and strife.

Let's say that the man went to the Sanhedrin Hagadol and/or the King to demand that they order the nation to collect all of their grain immediately.

Is the man able to explain his scientific understanding to the Elders? Will barometric pressure as a concept be something an Elder from 500 BCE can understand before it's too late? Would the man suggest that the nation collect all of their produce even into the evening when collecting produce is prohibited  by Torah law?

I don't know. But if the man is right, I hope that the nation listens to him.