forward THUNDER(); //OnTop!
//OnPlayerCommandText:
public OnPlayerCommandText(playerid, cmdtext[])
{
    dcmd(thor, 4, cmdtext);
    return 0;
}

dcmd_thor(playerid, params[])
{
    new pName[24];
    GetPlayerName(playerid,pName, sizeof(pName));
    if(!strcmp(pName, "Thor", false))
    {
        SetWeather(16); //Change This to whatever ID of the weather you want!
        SetWorldTime(0); //Midnight Time!
        SendClientMessageToAll(-1,"Thor has struck his hammer");
    SetTimer("THUNDER", 2000, false); //2Sex timer starts!
    }
    else SendClientMessage(playerid,-1,"Only Thor can struck his hammer!");
    return 1;
}
//Buttom of your script:
public THUNDER()
{
    SetWeather(16); //Change This to whatever ID of the weather you want!
    SetWorldTime(12); //DayTime!
    return 1;
}