"Upper-Midwest Severe Weather"
30-31 May 1998

This case provides information for a widespread area of severe weather that occurred over the period 30-31 May 1998 and stretched from South Dakota to New York. The case data begins in support of the tornado that hit Spencer, SD on 30 May 1998 and continues with a derecho event that moved through MN, WI, MI, IN, and NY. These events have been included in the Significant Weather Events of 1998.

This case includes data from eight separate radars, to allow you to focus on the details of the event over a broad geographic region.

For more detailed information of the event at specific locations:

• Spencer, SD Tornado by NWS Sioux Falls, SD and an Event Summary from the Service Assessment
• The Derecho Event of Sunday, May 31, 1998 by NWS Grand Rapids, MI
• Most widespread severe weather outbreak in a decade for NWS Buffalo, NY

Case Study 018