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May 2, 1999, 2:25 - 3:15 UT, seeing 5 - 6 (0 worst, 10 best), transparency 2. Central Meridian 112.11 degrees.

Astro-Physics 7.1" f/9 EDT refractor on homemade Dobsonian-style mount. Magnification 203x-289x with Baader binoviewer.

Just to the left of the North Polar Cap (NPC) I saw something I had not seen before. It was somewhat oval in shape, white in color with a dark border, in particular a dark line dividing it from the NPC. Also, it appeared large, but not quite as large as the polar cap. I had the impression this feature was slightly higher in elevation then the NPC, but dismissed this as an optical illusion. After looking at my Mars map back inside later I assumed it was Baltia, which had perhaps become frost covered. However, after checking with someone at the Mars ALPO section it appears what I saw was the large polar storm reported on Mars in late April. To the south of the polar cap Tempe and Alba are visible, with Chryse near the left or preceding limb.