29 March 1999 -- GOES-8 Sounder 7.0 Micrometer IR (Water Vapor)
Stratospheric Intrusion Over Southern Wisconsin?

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This loop of GOES-8 Sounder 7.0 micrometer InfraRed (water vapor) imagery shows the rapid eastward propagation of a shortwave across Nebraska, Iowa, and the southern Great Lakes region. Note the area of warming brightness temperatures (orange enhancement) in the wake of the departing shortwave -- this warming signaled a region of mesoscale subsidence and drying within the lower to middle troposphere, which moved east-southeastward across southern Minnesota and southern Wisconsin during the afternoon hours on 29 March 1999.

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