Map above shows the Goldwater Range and the Army's Yuma Proving round, with I-8 stretching through a narrow corridor from Gila Bend to Yuma.
Tuesday afternoon (June 9th) I noticed some radar echoes out northwest of Yuma around 3:45 pm MST (above and below). The echoes were only present in the lowest two tilts of data and were moving north-northeastward. Skies were, however, perfect clear - see concurrent visible satellite image - second below. Note that bird and insect migrations usually occur in the evening and during the night. So what was going on?
I assume that some exercise or activity at Yuma Proving Ground injected chaff into the near-surface atmosphere. Below is some kind of big armament out at Yuma Proving ground. The echoes dissipated after an hour or so. There was no similar activity yesterday afternoon. There was also no mention of the strange echoes in either the Tucson or Phoenix NWS weather discussions covering the relevant times. This event was also reminiscent of the high-level chaff releases that the Air Force used to do over the Goldwater Range.
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