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January 16, 2003: Cold Front with Light Snow

Author: Pam Heinselman, CIMMS/OU

Last Updated: 7 April 2003

Forecast/Weather:

Radar Operations:

Radar/Operational Status:

Operational Delivery:

Snapshots:

Reflectivity
Figure 1: The radar reflectivity field at 2:11 UTC shows anomalous propagation north and east of KOUN.
Differential Reflectivity
Figure 2: The radar reflectivity field at 4:19 UTC indicates precipitation ahead of a cold front approaching OKC from the northwest.
Specific Differential Phase
Figure 3: The mix of low and moderate differential reflectivity values associated with the radar reflectivity field at 4:19 UTC suggests light snowfall combined with areas of larger, horizontally-oriented aggregates.
Hydrometeor Classification
Figure 4: The field of high correlation coefficients with embedded lower correlation coefficients, colocated with higher ZDRs (see Fig. 3) at 4:19 UTC suggests light snowfall combined with areas of larger, horizontally-oriented aggregates.
Specific Differential Phase
Figure 5: The "linear" band of low reflectivity moving away from KOUN 7:06 UTC suggests the passage of the cold front through central Oklahoma.
Hydrometeor Classification
Figure 6: The "linear" band of ice crystals moving away from KOUN at 7:06 UTC suggests the passage of the cold front through central Oklahoma.
Radar reflectivity
Figure 7: Northwest-to-southeast-oriented bands of low reflectivity exist in the vicinity of KOUN at 14:12 UTC.
Differential Reflectivity
Figure 8: A mix of small positive and negative differential reflectivity values associated with the reflectivity image at 14:12 UTC indicate bands of ice crystals.
Hydrometeor Classification
Figure 9: The hydrometeor classification algorithm classifies the bands of ice crystals as dry snow.