Figure 1. Radar reflectivity imagery from Baltimore TDWR (BWI) between 1300 and 1330 UTC 25 January 2010.
Figure 1 displays an isolated shower moving rapidly from southeast of Washington DC to eastern Baltimore County between 1300 and 1330 UTC, passing just west of the FSK Bridge near 1320 UTC. A wind gust of 52 knots was recorded at the FSK Bridge PORTS station at 1324 UTC.
Figure 2. RUC model-derived guidance at 1300 UTC 25 January 2010 (top) and corresponding RUC sounding over FSK Bridge (bottom).
RUC-model derived guidance in Figure 2 indicated the potential for heavy showers as well as rapid storm motion due to strong winds in the lower and middle troposphere. Precipitable water values over the Baltimore-Washington corridor were greater than 40 mm (~1.5 inches) with storm motion indicated between 55 and 60 knots. The 1300 UTC RUC sounding over FSK Bridge echoed favorable conditions for high surface winds fostered by downward transport of horizontal momentum, with wind speeds near 70 knots (35 m/s) at the 850-mb level. Thus, the combination of precipitation loading, downward horizontal momentum transfer, and rapid storm motion resulted in this isolated severe convective wind event during a much larger-scale high wind event over the Chesapeake Bay region. Surface winds in excess of 50 knots posed a hazard to marine and ground transportation in the vicinity of the FSK Bridge.
Figure 1 displays an isolated shower moving rapidly from southeast of Washington DC to eastern Baltimore County between 1300 and 1330 UTC, passing just west of the FSK Bridge near 1320 UTC. A wind gust of 52 knots was recorded at the FSK Bridge PORTS station at 1324 UTC.
Figure 2. RUC model-derived guidance at 1300 UTC 25 January 2010 (top) and corresponding RUC sounding over FSK Bridge (bottom).
RUC-model derived guidance in Figure 2 indicated the potential for heavy showers as well as rapid storm motion due to strong winds in the lower and middle troposphere. Precipitable water values over the Baltimore-Washington corridor were greater than 40 mm (~1.5 inches) with storm motion indicated between 55 and 60 knots. The 1300 UTC RUC sounding over FSK Bridge echoed favorable conditions for high surface winds fostered by downward transport of horizontal momentum, with wind speeds near 70 knots (35 m/s) at the 850-mb level. Thus, the combination of precipitation loading, downward horizontal momentum transfer, and rapid storm motion resulted in this isolated severe convective wind event during a much larger-scale high wind event over the Chesapeake Bay region. Surface winds in excess of 50 knots posed a hazard to marine and ground transportation in the vicinity of the FSK Bridge.
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