1. Severe Wx Products
  2. Storm Prediction Center Convective Watch Archive

This application presents a browsable archive of SPC issued tornado and severe thunderstorm watches. Each sequential watch is assigned a numeric ID, which uniquely identifies a watch for each year. Up until 2006, the polygon was the valid area of the watch. Since then, the valid area is issued by county and marine zone.

Related Links: View This Watch on SPC Website   Download Watches   List PDS Watches

All active watches at issuance:

Previous Watch   --   Next Watch

Type:SVR
Watch #:
SAW Issuance201709200619-KWNS-WWUS30-SAW9
SEL Issuance201709200620-KWNS-WWUS20-SEL9
Watch Probs201709200618-KWNS-WWUS40-WWP9
Issue:2017-09-20 06:20 UTC
Expired/Cancelled:2017-09-20 10:03 UTC
WOU Outline Shapefiles07Z, 08Z, 09Z, 10Z,

Archive Status:

  • Watch archive should be complete back to 1997.
  • RADAR composite is mostly complete back to 1997.
  • Local Storm Reports are available after 2002.

Initial Watch Box and Watch By County Outline


Local Storm Reports:

Watch Polygon (KML):

<MultiGeometry><Polygon><outerBoundaryIs><LinearRing><coordinates>-91.41,46.93 -92,44.84 -94.25,44.84 -93.73,46.93 -91.41,46.93</coordinates></LinearRing></outerBoundaryIs></Polygon></MultiGeometry>

Watch Polygon (GeoJSON):

{"type":"MultiPolygon","coordinates":[[[[-91.41,46.93],[-92,44.84],[-94.25,44.84],[-93.73,46.93],[-91.41,46.93]]]]}