There were 9 convective periods for May 2009:
Start: 11/18Z End: 12/06Z Flow Regime: Other   radar/wind loop
Start: 13/01Z End: 13/08Z Flow Regime: SW-2    radar/wind loop
Start: 14/13Z End: 14/19Z Flow Regime: Other   radar/wind loop
Start: 18/04Z End: 18/08Z Flow Regime: SE-2    radar/wind loop
Start: 26/21Z End: 26/23Z Flow Regime: SW-1    radar/wind loop
Start: 27/19Z End: 28/02Z Flow Regime: SW-1    radar/wind loop
Start: 28/15Z End: 28/20Z Flow Regime: SW-1    radar/wind loop
Start: 29/17Z End: 30/00Z Flow Regime: SW-2    radar/wind loop
Start: 30/20Z End: 31/01Z Flow Regime: SW-1    radar/wind loop
 
Start: 11/18Z End: 12/06Z Flow Regime: Other   radar/wind loop
 First peak wind >= 20 knots at 111835Z   Last at 120600Z
 First peak wind >= 35 knots at 111930Z   Last at 111930Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 35 knots from 263 degrees for tower 0421 at 054 feet on 111930Z
 
Start: 13/01Z End: 13/08Z Flow Regime: SW-2    radar/wind loop
 First peak wind >= 20 knots at 130150Z   Last at 130230Z
 First peak wind >= 35 knots at 130220Z   Last at 130220Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 37 knots from 128 degrees for tower 0300 at 054 feet on 130220Z
 
Start: 14/13Z End: 14/19Z Flow Regime: Other   radar/wind loop
 First peak wind >= 20 knots at 141540Z   Last at 141710Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 23 knots from 129 degrees for tower 0421 at 054 feet on 141630Z
 
Start: 18/04Z End: 18/08Z Flow Regime: SE-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 19 knots from 188 degrees for tower 0300 at 054 feet on 180630Z
 
Start: 26/21Z End: 26/23Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 262125Z   Last at 262240Z
 First peak wind >= 35 knots at 262145Z   Last at 262150Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 36 knots from 268 degrees for tower 1007 at 054 feet on 262150Z
 
Start: 27/19Z End: 28/02Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 271930Z   Last at 280200Z
 First peak wind >= 35 knots at 272010Z   Last at 272025Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 42 knots from 303 degrees for tower 0714 at 054 feet on 272010Z
 
Start: 28/15Z End: 28/20Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 281550Z   Last at 281910Z
 First peak wind >= 35 knots at 281620Z   Last at 281835Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 37 knots from 244 degrees for tower 1102 at 162 feet on 281625Z
 
Start: 29/17Z End: 30/00Z Flow Regime: SW-2    radar/wind loop
 First peak wind >= 20 knots at 291735Z   Last at 292315Z
 First peak wind >= 35 knots at 292105Z   Last at 292105Z
 No peak winds >= 50 knots were reported
 Max peak wind reported was 37 knots from 206 degrees for tower 0398 at 060 feet on 292105Z
 
Start: 30/20Z End: 31/01Z Flow Regime: SW-1    radar/wind loop
 First peak wind >= 20 knots at 302000Z   Last at 310020Z
 No peak winds >= 35 knots were reported
 No peak winds >= 50 knots were reported
 Max peak wind reported was 26 knots from 087 degrees for tower 0403 at 054 feet on 302225Z