Partition by without sorting groupings?

Hi,
I have a problem where I have to use a function like the row_number() function but when I do my groupings I don't want to reorder the whole table.
So the result I want is in the sequence column of the table below:
sites
signal
date
sequence
site1
alarm
2014-05-14 12:00
1
site1
alarm
2014-05-14 12:30
2
site1
noalarm
2014-05-14 13:00
1
site1
noalarm
2014-05-14 13:30
2
site1
noalarm
2014-05-14 14:00
3
site1
alarm
2014-05-14 14:30
1
site1
alarm
2014-05-14 15:00
2
site2
alarm
2014-05-14 12:00
3
site2
noalarm
2014-05-14 12:30
1
site2
alarm
2014-05-14 13:00
1
site2
noalarm
2014-05-14 13:30
1
site2
noalarm
2014-05-14 14:00
2
So to desribe what I am trying to do,I want to group by sites order by date. Then I want to sequence the signals, retaining their date ordering.
How can I do this?
Thanks

Thanks, however, if I try that the sequence doesn't 'reset' so I get the result below:
sites
signal
date
Seq
site1
alarm
14/05/2014 12:00
1
site1
alarm
14/05/2014 12:30
2
site1
noalarm
14/05/2014 13:00
1
site1
noalarm
14/05/2014 13:30
2
site1
noalarm
14/05/2014 14:00
3
site1
alarm
14/05/2014 14:30
3
site1
alarm
14/05/2014 15:00
4
site2
alarm
14/05/2014 12:00
1
site2
noalarm
14/05/2014 12:30
1
site2
alarm
14/05/2014 13:00
2
site2
noalarm
14/05/2014 13:30
2
site2
noalarm
14/05/2014 14:00
3
Here's the create data if that's useful.
Thanks
create table myTable2 (
sites varchar(50) NULL,
signal varchar(50) NULL,
[date] datetime)
insert into myTable2(
sites,
signal,
[date]
values
('site1','alarm','2014-05-14 12:00:00.000'),
('site1','alarm','2014-05-14 12:30:00.000'),
('site1','noalarm','2014-05-14 13:00:00.000'),
('site1','noalarm','2014-05-14 13:30:00.000'),
('site1','noalarm','2014-05-14 14:00:000'),
('site1','alarm','2014-05-14 14:30:000'),
('site1','alarm','2014-05-14 15:00:000'),
('site2','alarm','2014-05-14 12:00:000'),
('site2','noalarm','2014-05-14 12:30:000'),
('site2','alarm','2014-05-14 13:00:000'),
('site2','noalarm','2014-05-14 13:30:000'),
('site2','noalarm','2014-05-14 14:00:000')

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