There were 5 convective periods for May 1998:
Start: 01/20Z End: 01/21Z Flow Regime: SW-1    radar/wind loop
Start: 04/18Z End: 04/21Z Flow Regime: SW-2    radar/wind loop
Start: 05/16Z End: 06/03Z Flow Regime: SW-2    radar/wind loop
Start: 18/22Z End: 19/02Z Flow Regime: Other   radar/wind loop
Start: 28/19Z End: 28/22Z Flow Regime: SW-1    radar/wind loop
 
Start: 01/20Z End: 01/21Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 012035Z   Last at 012035Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 20 knots from 259 degrees for tower 0421 at 054 feet on 012035Z
 
Start: 04/18Z End: 04/21Z Flow Regime: SW-2    radar/wind loop
 First peak wind >= 20 knots at 041800Z   Last at 042100Z
 First peak wind >= 35 knots at 041920Z   Last at 042035Z
 First peak wind >= 50 knots at 041950Z   Last at 041950Z
 Max peak wind reported was 50 knots from 238 degrees for tower 0022 at 054 feet on 041950Z
 
Start: 05/16Z End: 06/03Z Flow Regime: SW-2    radar/wind loop
 First peak wind >= 20 knots at 051725Z   Last at 051950Z
 First peak wind >= 35 knots at 051750Z   Last at 051800Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 41 knots from 212 degrees for tower 3131 at 295 feet on 051755Z
 
Start: 18/22Z End: 19/02Z Flow Regime: Other   radar/wind loop
 First peak wind >= 20 knots at 182235Z   Last at 190010Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 25 knots from 178 degrees for tower 0021 at 204 feet on 182350Z
 
Start: 28/19Z End: 28/22Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 282115Z   Last at 282115Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 20 knots from 318 degrees for tower 0300 at 054 feet on 282115Z