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Storm Based (Polygon) Special Weather Statements ER
Data Mining Tool
Outreach / Education
All Forecast Regions
Threat based polygon warnings, or storm based warnings were implemented nationally in 2008 and essential to effectively warn for severe weather and flash floods. SB warnings show the specific meteorological threat area and are not restricted to geopolitical boundaries. By focusing on the true threat area, polygons help improve NWS warning accuracy and quality. ER initiated an experimental Polygon Storm Based Special Weather Statements (SBS) at Weather Forecast Offices (WFO) Blacksburg, VA and State College, PA in 2009 to promote increased accuracy of alerting the public to significant weather events. The SBS methodology allows the forecaster the opportunity to be spatially specific, eliminating large areas needlessly alerted when compared to issuing a county based SBS. Based on positive feedback from partners and users, the SBS has been transitioned to an official product for all ER WFOs. The Guidelines for SBS issuance are included in ER supplement 05-2010 Special Weather Statements. When the directive that covers the Special Weather Statement was updated in 2012, there were so many offices already putting polygons on the SPS that it was decided that it was better to add it to the directive. The directive updated on September 28, 2012 included a revision in Section 3.3.4 for an optional polygon for all regions.
Product information and survey access
Point of Contact
Document (e.g. PDD)
Comment Start Date:
0000-00-00 Comment End Date: 0000-00-00
Christopher S. Strager
this was transitioned to official status by ER May 21, 2010. Documents were not submitted until May 2011.
Last edit date to this meta-data: 2015-10-28