Just some rambling thoughts on diurnal temperature ranges.
These 50 degree plus diurnal temperature ranges here sure raise hell with CWOP. At my location, which is rural, prairie, in a shallow bowl, both spring and fall morning temperatures can be 50+ degrees lower than afternoon temperatures. I am not saying this is an every day occurrence, but this fall's weather pattern has been conducive to it. This morning, for example, low was 10 and it is currently (2:25 p.m.) 62. Yesterday was similar. I have double checked my VP2 accuracy using a mercury thermometer.
Wondered who else has experienced this kind of "extreme" 24 hr range in a normal day? You get "flagged" by either CWOP or MesoWest?
I know the relative scarcity of reporting stations in this area increases the odds that my station will be flagged for suspicious data. Not much I can do about that.