Segments Format

The weather data stream is subdivided in various segments. Some segments have a
2/3 digit code for identification and fixed length for easy processing.
Segments are contiguos (no separation) to allow for easy mapping within your sketch.

FORECAST TYPES =========================================

Segment: 2 digit fixed length

CODE DESCRIPTION
---- -------------------------------------------
 CC  Current (latest) weather condition segment
 SF  Standard forecast
 TF  Temporary forecast
 PF  Probable forecast
 BE  Becoming forecast
 UF  Undefined forecast type

WEATHER CONDITION ======================================

Segment: Typically this is a 5 digit segment, however it 
can be up to 11 digit since 3 statuses can be reported
at one time. 

Syntax: WExCC
        WE = Segment identifier (WEather)
        x  = + heavy
             - light
             ! vicinity
             : normal
        CC = (see below)

CODE  DESCRIPTION
----  -------------------------------------------
 RA   Rain
 RS   Rain Showers
 RT   Rain with Thunderstorms
 DZ   Drizzle
 SH   Showers
 SL   Small Hail
 HA   Hail
 TS   Thunderstorm(s)
 TD   Thunderstorm(s) with Drizzle
 TH   Thunderstorm(s) with Hail 
 TG   Thunderstorm(s) with small Hail 
 PF   Patches of Fog
 FU   Fog 
 SU   Shallow Fog 
 PU   Partial Fog 
 SM   Smoke 
 HZ   Haze
 MI   Mist 
 PE   Ice Pellets
 SN   Snow
 SG   Snow Grains
 SS   Light Snow Showers
 BD   Blowing Dust 
 LD   Low Drifting Dust 
 LS   Low Drifting Sand 
 SA   Sand
 PO   Dust/Sand Wirls
 DS   Dust Storm 
 DT   Widespread Dust 
 SQ   Squal 
 NS   No significant Weather Change
 
Decoding examples:

+RA = Heavy Rain
-RA = Light Rain 
:RA = Rain 
!RA = Rain in vicinity
+RA-TS = Heavy Rain with light thunderstorm(s)

In addition these special flags can appear:

 AF   Automated Forecast (no human verification)
 VI   Denominates the next segment is 'in vicinity'
      ex: !VI-RA  = Vicinity Light Rain approacing

APPLICABLE FORECAST TIME ===============================

Segment: 8 digits fixed length with 2 digit code

Syntax : TMxhhmmddMM
         TM  = Segment identifier (TiMe)
         hh  = Hours
         mm  = Minute
         dd  = Day
         MM = Month

CODE DESCRIPTION
---- -------------------------------------------
TM   Time forecast was observed/applicable

TEMPERATURE ============================================

Segment: 3 digits fixed length with 2 digit code

Syntax : TTfff 
         TT   = Segment identifier (TemperaTure)
         fff  = Degrees in Fahrenheit

DEW POINT ==============================================

Segment: 3 digits fixed length with 2 digit code

Syntax : DPfff 
         DP   = Segment identifier (Dew Point)
         fff  = Degrees in Fahrenheit

RELATIVE HUMIDITY ======================================

Segment: 2 digits fixed length with 2 digit code

Syntax : RHpp 
         RH   = Segment Identifier (Relative Humidity)
         pp   = Humidity expressed in percent (0-99)

PRESSURE (ALTIMETER) =====================================

Segment: 5 digits fixed length with 2 digit code

Syntax : PRhh.hhmmmm.m
         PR      = Segment identifier (PRessure)
         hh.hh   = Pressure expressed in Hg

WIND SPEED & DIRECTION ===================================

Segment: 8 digits fixed length with 2 digit code

Syntax : WIxxxnnn
         WI  = Segment identifier (WInd)
         xxx = Wind direction (N, S, NE, ESE, WSW etc)
         nnn = Speed in MPH

CLOUDS COVERAGE ==========================================

Segment: 6 digits fixed length with 3 digit code

Syntax : CCCnnn
         CCC = Code (see below)
         nnn = Altitute in hundreds of feet (add 2 zeros)

CODE DESCRIPTION
---- -------------------------------------------
SCT  Scattered clouds
CLR  Clear skies
SKC  Clear skies (alternative)
FEW  1/8 light coverage
BKN  Broken clouds (> 4/8 coverage)
OVC  Overcast
CAV  Clear skies, unlimited visibility

VISIBILITY ===============================================

Segment: 8 digits fixed length with 2 digit code

Syntax : VImmmkkk
         VI  = Segment identifier (VIsibility)
         mmm = Visibility in miles
         nnn = Visibility in kilometers


CEILING ==================================================

Segment: 5 digits fixed length with 2 digit code

Syntax : CEfff
         CE  = Segment identifier (CEiling)
         fff = Altitude in hundreds of feet (add 2 zeros)