Comment by dlcarrier
The latest Captains Speaking podcast has an discussion about one of the hosts being in a similar situation: https://youtu.be/5ovlZ221tDQ
Fortunately, the flight left with extra fuel, because it was cheaper to carry excess from the origin airport than to buy it at the destination airport, so reserve fuel wasn't needed, but it was close. Also, there was lots of lightning.
I absolutely love insights like this into areas of the world I have no knowledge. Makes absolute sense in the modern world but also something I'd not think about