An interesting "what is that?!" case from October 6, 2004


The morning of October 6, 2004 was a relatively benign one. There was an upper ridge over the Prairies with a trough approaching Alberta, causing some showers there.
Morning RADAR imagery was interesting, though, with something very unexpected showing up.

Looking between the RADAR shots and the satellite pictures, it seemed to make no sense.

RADAR showed some echoes over northeastern Montana - the first idea was that it was anomalous propagation (more on that with the answer) but then examination of the composite RADAR showed that the echoes were moving approximately with the upper winds. The satellite picture confirms no clouds over northeast Montana. So what was happening?

Click here to find out the answer.

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Last update to this page: October 6, 2004