I think I'm going to try treating my windscreens with the
Neverwet super hydrophobic treatment Voltronic mentioned in the current windscreen thread-
http://taperssection.com/index.php?topic=174011.msg2183266#msg2183266 and see how well that works for my wide omnis which are never under an umbrella anyway (unless they just happen to end up under a neighboring tapers umbrella), and might try forgoing use of an umbrella over the directional mics to, depending on how severe the weather looks.
Caveats are that since I'm using the humidity and weather resistant miniature DPAs (see my post on the previous page about a 4061 pair working fine while completely submerged) I'm not concerned so much about protecting the mics, but rather attempting to maintain good sound. I'm mostly looking for good water repellency to keep the foam windscreens dry, as it is most definitely audible when they saturate with water. I'm not yet sure if the 4098H hypers are quite as 'waterproof' due to their rear vents, but they are equally humidity resistant.
Forgoing the umbrella may lead to louder droplet impact noise (does with miniature foams, perhaps not with BAS), but I get noise from an umbrella directly over the mics anyway in any significant rain (can't be bothered to put a towel or something atop it to damp impact, which would get over saturated and heavy anyway - we preferably need hydrophobic fuzzy-hair surfaced umbrellas for this).
Recording gear remains wet-protected in a soft sided cooler bag sitting on a folding stool, with a thick black lawn garbage bag over it. Taper stays dry with a large umbrella, river hat & poncho. Chair and folding stool fit under a lawn garbage bag if left vacant.