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Because ice XI can theoretically form at low pressures at temperatures between 50–70 K – temperatures present in astrophysical environments of the outer solar system and within permanently shaded polar craters on the Moon and Mercury. Ice XI forms most easily around 70 K – paradoxically, it takes longer to form at lower temperatures.
GOES-16 satellite image of the storm system responsible for the tornado outbreak across the Southern United States at 14:06 UTC (9:06 a.m. CDT) on March 25. On March 18, the Storm Prediction Center (SPC) first indicated the potential for organized severe weather across the Southern Plains in advance of an upper-level trough across the Western United States. [9]