There were 11 convective periods for September 2011:
Start: 01/00Z End: 01/02Z Flow Regime: NE Con      radar/wind loop
Start: 05/20Z End: 05/22Z Flow Regime: SE-1    radar/wind loop
Start: 06/15Z End: 06/18Z Flow Regime: Other   radar/wind loop
Start: 07/19Z End: 08/00Z Flow Regime: NW      radar/wind loop
Start: 08/21Z End: 09/00Z Flow Regime: NE      radar/wind loop
Start: 09/21Z End: 10/01Z Flow Regime: NW      radar/wind loop
Start: 10/20Z End: 11/00Z Flow Regime: Other   radar/wind loop
Start: 11/20Z End: 12/01Z Flow Regime: Other   radar/wind loop
Start: 20/05Z End: 20/17Z Flow Regime: SE-2    radar/wind loop
Start: 22/17Z End: 23/00Z Flow Regime: SE-2    radar/wind loop
Start: 30/19Z End: 30/22Z Flow Regime: Other   radar/wind loop
 
Start: 01/00Z End: 01/02Z Flow Regime: NE Con      radar/wind loop
 First peak wind >= 20 knots at 010055Z   Last at 010055Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 20 knots from 172 degrees for tower 0003 at 054 feet on 010055Z
 
Start: 05/20Z End: 05/22Z Flow Regime: SE-1    radar/wind loop
 First peak wind >= 20 knots at 052000Z   Last at 052140Z
 First peak wind >= 35 knots at 052050Z   Last at 052115Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 46 knots from 196 degrees for tower 0300 at 054 feet on 052100Z
 
Start: 06/15Z End: 06/18Z Flow Regime: Other   radar/wind loop
 First peak wind >= 20 knots at 061500Z   Last at 061800Z
 First peak wind >= 35 knots at 061635Z   Last at 061635Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 41 knots from 256 degrees for tower 0403 at 054 feet on 061635Z
 
Start: 07/19Z End: 08/00Z Flow Regime: NW      radar/wind loop
 First peak wind >= 20 knots at 072035Z   Last at 072330Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 30 knots from 195 degrees for tower 0300 at 054 feet on 072220Z
 
Start: 08/21Z End: 09/00Z Flow Regime: NE      radar/wind loop
 First peak wind >= 20 knots at 082145Z   Last at 082335Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 27 knots from 179 degrees for tower 0421 at 054 feet on 082330Z
 
Start: 09/21Z End: 10/01Z Flow Regime: NW      radar/wind loop
 First peak wind >= 20 knots at 092205Z   Last at 092330Z
 First peak wind >= 35 knots at 092240Z   Last at 092320Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 38 knots from 217 degrees for tower 0019 at 054 feet on 092320Z
 
Start: 10/20Z End: 11/00Z Flow Regime: Other   radar/wind loop
 First peak wind >= 20 knots at 102245Z   Last at 102245Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 22 knots from 225 degrees for tower 0421 at 054 feet on 102245Z
 
Start: 11/20Z End: 12/01Z Flow Regime: Other   radar/wind loop
 First peak wind >= 20 knots at 112350Z   Last at 120100Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 23 knots from 179 degrees for tower 0506 at 054 feet on 120040Z
 
Start: 20/05Z End: 20/17Z Flow Regime: SE-2    radar/wind loop
 First peak wind >= 20 knots at 200615Z   Last at 201615Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 27 knots from 130 degrees for tower 0019 at 054 feet on 200640Z
 
Start: 22/17Z End: 23/00Z Flow Regime: SE-2    radar/wind loop
 First peak wind >= 20 knots at 221810Z   Last at 222315Z
 First peak wind >= 35 knots at 222135Z   Last at 222135Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 35 knots from 149 degrees for tower 3131 at 204 feet on 222135Z
 
Start: 30/19Z End: 30/22Z Flow Regime: Other   radar/wind loop
 First peak wind >= 20 knots at 301930Z   Last at 302130Z
 First peak wind >= 35 knots at 301955Z   Last at 302040Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 40 knots from 208 degrees for tower 0506 at 054 feet on 301955Z