Ratios of any SNOW on extreme positive and negative PNA days

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Figures show results for sets of stations determined by certain criteria.
Choose a viewing option from the set in a row.  All figures in a row are the same, and a small version is shown on the right.

Stations whose SNOW/PNA ratios are statistically significant
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Only PNG figures due to larger file sizes with terrain

Stations with >=0 extreme any SNOW days
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Stations with >=500 extreme any SNOW days
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Stations with <=500 extreme any SNOW days
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Only PNG figures due to larger file sizes with terrain