FW: Radar Anomalies – “Anomalous Propagation”

From: Andrew Johnson

Date: 2010-05-10 19:25:44

  From: Daniel Johnson Sent: 10 May 2010 15:37To: ad.johnson@ntlworld….Subject: Re: Update on US Weather Radar Anomalies Andrew,   I found this. Don’t see how it explains those huge rings, some that are dissipating and others that last longer.  All weather radar sources have same range, power output?  What if these things are spherical, but only the equator areas show up where the water vapors are?   Anomalous propagation   nordrad.fmi.fi/metho…   or read into this for three or four paragraphs and ponder what they might really know!   Radiation of horizontal electric dipole on large dielectric sphere (creeping waves? could this apply to microwaves?)   www-users.math.umd.e…   Dan —– Original Message —– From: Andrew Johnson To: Andrew Johnson Sent: Monday, May 10, 2010 5:22 AM Subject: FW: Update on US Weather Radar Anomalies t the bottom of the page,   weather.unisys.com/r…    there is this text:   This is a composite plot of the radar summary, echo tops, storm movement, TVS and MESO signatures and watch boxes. The radar summary is color coded by precip type. Greens, yellows and reds are rain. Pinks are mixed precipitation (freezing rain, sleet). Blues are snow. NOTE: Radar data is susceptible to a phenomena called anomalous propagation. This generally happens at night and appears as a area of 20 dBZ echos (darkest green) which is centered around each radar site and expands with time. To try and reduce the problem, low echo values near the radar sites have been removed.   So the rings seem to be the result of excluded data – caused by “anomalous propagation” – not really sure what they’re saying… but perhaps the process they are using on the data covers up things like this (from 2007, Texas)   www.youtube.com/watc…    

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