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Lately many of us have heard stations from rather distant areas on the 147.315 repeater. It is interesting to hear those stations that we normally do not hear but often it is just due to a weather phenomenon called and inversion. I expect that some amateurs sit back and wonder just what is this inversion thing that some offer as an explanation for the unusually distant stations heard and some stations that we can even carry on a QSO with. Sometimes the stations seem as though they are just audible for enough time to hear a call sign but other times long enough for a typical QSO. Then there are times that you may not even be able to hear or access your local repeater and again you will hear folks offer the explanation as an inversion as well.
Consider the simplified diagram of an inversion below. Note that typically as you increase elevation the temperature lowers but with an inversion the opposite happens! You can see the yellow area depicting the inversion, which actually ends up acting as a boundary layer that can either attenuate the signal to and from the repeater or at times signal attenuation can occur to the extent of both blocking the repeater from hearing your transmitted signal and from you hearing the repeater’s transmitted signals. This occurrence can lead one to believe the repeater is off the air. I recall years ago there were trips made to the repeater site when we could not use the repeater, only to find the repeater operating. All due to an inversion. Sometimes the inversion layer is well above what the diagram depicts too, leading to other stations that you will be able to talk with that you would not ordinarily be able. There is another term used for this phenomenon which is called ducting that enables more distant than typical communications to occur, especially on VHF as well as UHF.
Inversions, ducting, tropo and what ever other titles the phenomenon of having radio signals reflected and refracted is an interesting and vast topic of which you can read up on. Look for propagation of radio signals either on the Internet or the ARRL Handbook for Radio Communications, what was previously called the Radio Amateur’s Handbook.
SkyWarn Recognition Day has come and gone! I was able to contact 16 stations, for the time that I was on the air band conditions were rather weak not to mention the QSB. For my efforts I was able to print the certificate inserted below. It’s not all that big of a deal but it’s something to show for the effort. After all, one of the aspects of ham radio is communicating regardless of conditions and it was a National event to participate in.
 The 2015 QCARC Christmas Dinner will be held at the Arrowhead Restaurant, Rte. 322 East of Clearfield – Saturday December 19, 6:00 PM No Reservations are required. There will be a buffet available as well as the availability to order off of the regular menu.
I expect that many of us have witnessed a scene very similar to the above photo. In our immediate area it is a natural event to have severe winter weather that impacts driving conditions, sometimes to the extent that we really should not be on the road. Often just postponing travel for an hour or two may enable road crews to treat the roads and give the chemicals time to take effect on the snow and ice to provide a safer traveling environment.
If you have to travel, be prepared. First off be sure you are aware of what you are getting into with severe winter weather driving. Be sure your vehicle is ready to go with a full tank of fuel and appropriate tires in good condition. Consider some additional items such as a small shovel, sand or traction mats, chains for times it gets really bad and even a very good blanket such as wool or a Mylar reflective emergency blanket. Remember to keep the cell phone charged too. Common sense helps but too often it is not so common!
Many amateur radio operators who travel have an additional resource at hand that will help with gaining a little more information about the weather. That resource can be the 2 meter transceiver which may have the capability to receive the NOAA Weather Radio announcements. Some transceivers even have a feature that will activate an alert when the NOAA radio station broadcasts their severe weather alert. Another useful service often provided through APRS digi-peaters are text alerts about road conditions that may relate to road closures due to various issues such as traffic accidents. Also some repeaters transmit bulletins relative adverse weather and road conditions.
For much more information that may make your winter and 
your travel safer check out the link
http://www.nws.noaa.gov/om/winter/index.shtml
 The Quad-County Amateur Radio Club is a WRN Ambassador “Weather-Ready Nation Ambassador™ and the Weather-Ready Nation Ambassador™ logo are trademarks of the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, used with permission.”
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