Iowa Environmental Mesonet

Iowa State University Department of Agronomy

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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.

All active watches at issuance:

  --   Next Watch

Type:TOR
Watch #:
Issue:2012-01-17 05:50 GMT
Expired/Cancelled:2012-01-17 13:03 GMT
WOU Outline Shapefiles00Z, 01Z, 02Z, 03Z, 04Z, 05Z, 06Z, 07Z,
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 Geometry:

 -94.512912018099996,36.617822662899997 -91.332532640799997,39.301451558099998 -88.337688378600006,39.301451558099998 -91.625557744700004,36.617822662899997 -94.512912018099996,36.617822662899997