7X Background Radiation In Leading Edge Rainfall, 15X In Trailing Edge Snow

We took a sample on 1/27/12 at 8:40 pm from the very first rain to hit the truck  as we were driving home   this evening. The paper towel swipe returned a reading of 7 times above background radiation, approximately 0.07 mR/hr. Typically the hottest rain falls during the trailing edge of a storm.

Update: 1/28/12 at 12:40am
The rain has changed into light snow and a sample wipe was taken from the same surface sampled earlier. The new sample returned a reading of 15X greater than background radiation.