Should be separate by space

issue time: 1900Z
obs time: 1800Z
TC ADVISORY

DTG:                        20040925/1900Z
TCAC:                       YUFO
TC:                         GLORIA
ADVISORY NR:                2004/13
OBS PSN:                    25/1800Z N2706 W07306
CB:                         WI 250NM OF TC CENTRE TOP FL500
MOV:                        NW 20KMH
INTST CHANGE:               INTSF
C:                          965HPA
MAX WIND:                   22MPS
FCST PSN +6 HR:             25/2200Z N2748 W07350
FCST MAX WIND +6 HR:        22MPS
FCST PSN +12 HR:            26/0400Z N2830 W07430
FCST MAX WIND +12 HR:       22MPS
FCST PSN +18 HR:            26/1000Z N2852 W07500
FCST MAX WIND +18 HR:       21MPS
FCST PSN +24 HR:            26/1600Z N2912 W07530
FCST MAX WIND +24 HR:       20MPS
RMK:                        NIL
NXT MSG:                    20040925/2000Z

Miss information about timeIndicator

Like in speci-A3-2.xml
for FCST AT use TimeInstant instead TimePeriod

BECMG TL1700: FM not specified so beginPosition should be noted with attribute indeterminatePosition="before" CAVOK is not specified so its not OK
MeteorologicalAerodromeTrendForecast -> cloudAndVisibilityOK="false"

iwxxm:LengthWithNilReasonType
and 
iwxxm:DistanceWithNilReasonType
are include in measures.xsd