09 March 1999 -- GOES-8 6.7 Micrometer IR (Water Vapor)
Heavy Snow Over the Mid-Atlantic Region

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This loop of GOES-8 6.7 micrometer InfraRed (water vapor) imagery shows a mid-level dry slot advancing east-northeastward across the central Appalachian and Mid-Atlanic regions on 09 March 1999. Snowfall rates were enhanced beneath the band of cold cloud tops (temperatures of -50 to -60 C, light blue enhancement) which was along the leading edge of this dry slot. Hourly surface reports are also plotted on the imagery.

In addition, a lobe of vorticity can be seen moving eastward across West Virgina toward the Washington DC area during the 18:00 UTC to 23:00 UTC time frame. Upward vertical motion ahead of this vorticity lobe helped to enhance showfall rates later in the day, after the passage of the main cold cloud band.

Back to the 09 March 1999 Heavy Snow page