Well forecasters get more accurate the closer a storm gets.
Nobody else around here has any of there crops covered, unlike in Humboldt . We get a lot less moisture than in Humboldt Co.
The advantage of a greenhouse would be to block wind and retain heat towards the end of the grow season. It would also allow for co2 and protect lights from the weather allowing for a longer grow season. The bad would be humidity control which would be hard to control without power. You can set up automatic passive vents and even solar powered venting in the day time but lights, fans, venting at night and even co2 would be tough without steady power. I`m just not sure yield would increase enough to make it worth the investment. It already costs a bunch to pull off a fair size grow of outdoor. Seems ever trip to the hydro stores costs more than the last trip.
I`m thinking next year starting an early auto flower grow and then a regular grow. If I could set up the green houses with blackout tarps I could induce flower early and then put in a third grow, but then I`d need heat even in a greenhouse. All is possible with enough money for the equipment and supplies, even with out power lines!