| -72 hours | -48 hours | -24 hours |
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| 0 hours | + 24 hours | |
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The 500 millibar height lines
are shown in green (in decameters). The deviation of these heights
from the 30 year climatology is shown in the blue and red contours (given
in decameters). The blue contours highlight where the 500 mb heights
are lower than climatology would suggest, and the red show where the heights
are higher than climatology.
| -48 hours | -24 hours |
 |
 |
| 0 hours | +24 hours |
 |
 |
Sea level composite maps for 48 hours before initial snowfall up to
24 hours after snowfall. Isobars are in millibars.