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 Issuance201709200334-KWNS-WWUS30-SAW8
SEL Issuance201709200335-KWNS-WWUS20-SEL8
Watch Probs201709200331-KWNS-WWUS40-WWP8
Issue:2017-09-20 03:35 UTC
Expired/Cancelled:2017-09-20 08:03 UTC
WOU Outline Shapefiles04Z, 05Z, 06Z, 07Z, 08Z,

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>-96.59,43.5 -96.11,47.5 -93.75,47.5 -94.41,43.5 -96.59,43.5</coordinates></LinearRing></outerBoundaryIs></Polygon></MultiGeometry>

Watch Polygon (GeoJSON):

{"type":"MultiPolygon","coordinates":[[[[-96.59,43.5],[-96.11,47.5],[-93.75,47.5],[-94.41,43.5],[-96.59,43.5]]]]}