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.WEDNESDAY...MOSTLY SUNNY. HIGHS IN THE LOWER 50S. EAST WINDS 5 TO
10 MPH.
.WEDNESDAY NIGHT...MOSTLY CLEAR. LOWS IN THE UPPER 20S. EAST WINDS
5 TO 10 MPH.
.THANKSGIVING DAY...PARTLY SUNNY. HIGHS IN THE LOWER 50S.

@ARGV = 'paz049.txt';
my $buffer = '';
...
$buffer =~ s/\s+$//;
$buffer =~ s/\n(?!\.)/ /g;
my @lines = split /\s*\n\./, $buffer;

TONIGHT...BECOMING PARTLY CLOUDY. LOWS IN THE MID 20S. NORTHWEST  WIND
+S AROUND 5 MPH.
TUESDAY...PARTLY CLOUDY IN THE MORNING...THEN BECOMING SUNNY. HIGHS IN
+ THE MID 40S. SOUTHWEST WINDS AROUND 5 MPH. 
...
SUNDAY...PARTLY CLOUDY IN THE MORNING...THEN BECOMING SUNNY. HIGHS ARO
+UND 50. 
SUNDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 30S. 
MONDAY...DECREASING CLOUDS. HIGHS IN THE UPPER 40S.