Flares will definitely do the job, but when cold and wet are in the forecast, I switch to liquid fuel and a stove. the liquid fuel (either white gas or kerosene) will get a roaring fire going, if one is needed. Discretion is advised....

I am nostalgic for carbide lamps, standard equipment for caving until a couple of decades ago. They provided light, heat, and a live flame and you were guaranteed a fire, if necessary.