Needling
We all know the basic difference between deciduous and coniferous trees. Deciduous trees drop their leaves in the fall and grow new ones in the spring. Conifers are evergreens that hold their leaves (or needles) year around. But that's really not the whole story. In fact, conifers drop needles continuously all year around. The big Douglas Firs in my yard and the wind like to send needles into the rain collector of my weather station. These can clog the aperture in the bottom of the collector. To deal with this, I devised a successful strategy using a kitchen strainer to catch the needles. About a year ago, Davis Instruments revised the design of their collector for the Vantage Pro2 station. It included a debris screen that fit in the bottom of the bucket. This looked like a good idea so I ordered one. Unfortunately, as you can see in the photo, the slots in the new debris screen are too large to hold back the fir needles. Three or four times this winter I