The typical definition of a "closed low" is defined by Recon finding winds from at least 4 different directions nearly perpendicular to their flight path. I.e. flying from the SW to the NE quadrant the wind would be from the NW in the SW Quad and shift to blowing from the SE in the NE Quadrant. These are rough estimates: NW Quad = NE wind SW Quad = NW wind SE Quad = SW wind NE Quad = SE wind
After flying the INVEST pattern they will make the determination of whether the Low has "closed off". Typical patterns are the "Delta" pattern and the "Alpha" pattern. You can probably Google the NHOP and find a diagram of each pattern. Recon flies a "leg" in one direction until the wind shifts. They then turn and fly until the next wind shift and repeat the pattern until they can " close it off"
You can use satellite imagery to some extent for closing a low. But radar and recon are much better.
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