We had a trace yesterday in SH. There was not ONE but TWO periods of rain, the first at 1236 to 1237, and the second from 1240 to 1240:30, both from the same cloud, but likely from different turrets protruding above the base. The drops were very small, barely mm-size, with considerably horizontal separation between them. Likely were from a few ice crystals that rimed up, became soft hail, then melted and evaporated on the way down to those tiny 1-mm sizes.
Here’s the key to recording trace events: First of all, you have to “want it”; have to have the fire in your belly like I do, that a day in which a small amount of rain falls is not getting by you as a zero rain day. In effect, you have to have a linebacker’s mentality. Be out there when it might happen, park your car outside overnight after cleaning the front and back windows before nightfall. Dust on it is especially good.
Now for yesterday and what happened, presented in detail so that you can improve your trace measuring skill set:
Now, for that smog bank that moved in during the afternoon….THAT was a horrible sight, and kind of ruined the late afternoon sky views. The deep blue seen in the first shot was replaced by this whitish, hazy look, lots of “crepsucular” rays, in fact the whole sky got a bit “suckulent”, to misspell another word with purpose…. Take a look:
Likely will have the same stuff today. Origin? Well, seems to be coming out of the southwest and Mexico, but also may be old southern Cal smog. Here’s the GOES aerosol optical depth (AOD) image for later yesterday afternoon, 3:15 PM.
Today? Some smog, some pretty-but-dirty Cumulus clouds (ones with extra high droplet concentrations, likely darker bases than they really should have due to the “dirt” inside’em), and not much more. Maybe a Cumulonimbus off on the horizon somewhere.