The cost of LoRa at each node is prohibitive. Something like a simple 433MHz link to a LoRa gateway might be more affordable, but even then, the costs are very high and the maintenance is nightmarish.Since LoRa consumes much less power than Wifi, it can be operated continuously using only solar cells. The solar cell and transmitter module are attached to a pole, and a rod with a pressure sensor is strapped along a wire.
View attachment 295540
If the wire breaks, the altitude at which the sensor is installed will drop, and this change in air pressure is monitored by the server. You can use myDevices Cayenne as a dashboard or use IFTTT to alert you.