9A.6A
Effective storm-based warning strategies (Formerly P6.9)
Kevin A. Scharfenberg, NOAA/NWS Office of Climate, Water, and Weather Services, Norman, OK ; and K. Cook, J. T. Ferree, B. N. Grant, and J. LaDue
On 1 October 2007, the National Weather Service changed its severe local storm warning strategy and verification procedures from county-based to "storm-based". Ideally, this means warnings are issued for the expected path of the hazardous weather without regard to geopolitical boundaries. Some text-based dissemination systems are still county-based, complicating efforts to provide effective storm-based warnings. Convective systems and storm clusters with varying motion vectors and rapid evolution have posed a particularly significant challenge to forecasters.
This presentation will refer to radar data from several severe storm events to provide effective ways to issue storm-based warnings with these primary goals:
* Focus on specific threat area
* Minimize false alarm area
* Minimize the number of alerts for a single county
* Anticipate rapid storm evolution and variable storm motion
* Cover all reports with as much lead time as feasible
Recorded presentationSession 9A, Forecasting, Warning, and/or Verification
Tuesday, 28 October 2008, 4:30 PM-6:00 PM, North & Center Ballroom
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