There were 16 convective periods for September 1998:
Start: 01/21Z End: 02/02Z Flow Regime: NW      radar/wind loop
Start: 02/22Z End: 03/04Z Flow Regime: SW-2    radar/wind loop
Start: 04/14Z End: 04/17Z Flow Regime: SW-2    radar/wind loop
Start: 05/08Z End: 05/23Z Flow Regime: SE-1    radar/wind loop
Start: 06/14Z End: 06/19Z Flow Regime: SE-2    radar/wind loop
Start: 07/14Z End: 08/00Z Flow Regime: SE-1    radar/wind loop
Start: 14/19Z End: 15/18Z Flow Regime: SE-2    radar/wind loop
Start: 15/18Z End: 16/21Z Flow Regime: SE-2    radar/wind loop
Start: 17/12Z End: 17/23Z Flow Regime: SE-1    radar/wind loop
Start: 18/18Z End: 19/05Z Flow Regime: SW-1    radar/wind loop
Start: 19/15Z End: 19/20Z Flow Regime: SW-1    radar/wind loop
Start: 20/17Z End: 20/18Z Flow Regime: SW-1    radar/wind loop
Start: 21/19Z End: 21/23Z Flow Regime: SW-1    radar/wind loop
Start: 22/18Z End: 22/21Z Flow Regime: SW-2    radar/wind loop
Start: 23/16Z End: 23/23Z Flow Regime: NW      radar/wind loop
Start: 26/21Z End: 26/23Z Flow Regime: SE-2    radar/wind loop
 
Start: 01/21Z End: 02/02Z Flow Regime: NW      radar/wind loop
 First peak wind >= 20 knots at 012345Z   Last at 020100Z
 First peak wind >= 35 knots at 020010Z   Last at 020015Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 38 knots from 264 degrees for tower 0108 at 054 feet on 020015Z
 
Start: 02/22Z End: 03/04Z Flow Regime: SW-2    radar/wind loop
 First peak wind >= 20 knots at 022330Z   Last at 030400Z
 First peak wind >= 35 knots at 030115Z   Last at 030115Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 37 knots from 157 degrees for tower 3131 at 295 feet on 030115Z
 
Start: 04/14Z End: 04/17Z Flow Regime: SW-2    radar/wind loop
 No peak winds >= 20 knots were reported
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 18 knots from 200 degrees for tower 0300 at 054 feet on 041550Z
 
Start: 05/08Z End: 05/23Z Flow Regime: SE-1    radar/wind loop
 First peak wind >= 20 knots at 050900Z   Last at 052150Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 34 knots from 140 degrees for tower 0021 at 204 feet on 052000Z
 
Start: 06/14Z End: 06/19Z Flow Regime: SE-2    radar/wind loop
 First peak wind >= 20 knots at 061500Z   Last at 061600Z
 First peak wind >= 35 knots at 061510Z   Last at 061510Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 35 knots from 156 degrees for tower 0003 at 054 feet on 061510Z
 
Start: 07/14Z End: 08/00Z Flow Regime: SE-1    radar/wind loop
 First peak wind >= 20 knots at 072030Z   Last at 072220Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 33 knots from 160 degrees for tower 0421 at 054 feet on 072220Z
 
Start: 14/19Z End: 15/18Z Flow Regime: SE-2    radar/wind loop
 First peak wind >= 20 knots at 141900Z   Last at 151800Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 34 knots from 134 degrees for tower 1102 at 204 feet on 142045Z
 
Start: 15/18Z End: 16/21Z Flow Regime: SE-2    radar/wind loop
 First peak wind >= 20 knots at 151800Z   Last at 162100Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 29 knots from 144 degrees for tower 0020 at 204 feet on 161250Z
 
Start: 17/12Z End: 17/23Z Flow Regime: SE-1    radar/wind loop
 First peak wind >= 20 knots at 171330Z   Last at 172205Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 25 knots from 214 degrees for tower 1000 at 054 feet on 172030Z
 
Start: 18/18Z End: 19/05Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 182020Z   Last at 182225Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 27 knots from 236 degrees for tower 1102 at 204 feet on 182120Z
 
Start: 19/15Z End: 19/20Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 191530Z   Last at 192000Z
 First peak wind >= 35 knots at 191920Z   Last at 191925Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 38 knots from 232 degrees for tower 0062 at 204 feet on 191920Z
 
Start: 20/17Z End: 20/18Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 201700Z   Last at 201800Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 27 knots from 245 degrees for tower 0062 at 204 feet on 201745Z
 
Start: 21/19Z End: 21/23Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 211930Z   Last at 212130Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 29 knots from 286 degrees for tower 0805 at 054 feet on 212045Z
 
Start: 22/18Z End: 22/21Z Flow Regime: SW-2    radar/wind loop
 First peak wind >= 20 knots at 221910Z   Last at 222020Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 31 knots from 242 degrees for tower 0021 at 204 feet on 221945Z
 
Start: 23/16Z End: 23/23Z Flow Regime: NW      radar/wind loop
 No peak winds >= 20 knots were reported
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 19 knots from 057 degrees for tower 1612 at 054 feet on 232020Z
 
Start: 26/21Z End: 26/23Z Flow Regime: SE-2    radar/wind loop
 First peak wind >= 20 knots at 262100Z   Last at 262155Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 22 knots from 108 degrees for tower 1007 at 054 feet on 262110Z