Decoding Observations and Terminal Aerodrome Forecasts. Weather Observer/Forecaster O-LD 18 th Weather Squadron Ft Polk, LA
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1 Decoding Observations and Terminal Aerodrome Forecasts Weather Observer/Forecaster O-LD 18 th Weather Squadron Ft Polk, LA
2 Part I. Decoding Observations What types of data goes into a weather observation? 1. Report Type 2. Station ID 3. Date Time 4. Modifier 5. Wind 6. Visibility 7. RVR 8. Weather 9. Sky Condition 10. Temp/Dewpoint 11. ALSTG
3 Part I. Decoding Observations Automated Observations report same basic data as Manual Observations 1. Report Type 2. Station ID 3. Date Time 4. Modifier 5. Wind 6. Visibility 7. RVR 8. Weather 9. Sky Cond. 10. Temp/Dewpoint 11. ALSTG
4 5. Wind: 36009KT, VRB06KT 6. Visibility: 7sm, 9999 m 7. RVR: Runway Visual Range (m) 8. Weather: -RA, FG, +FC, etc. 9. Sky Cond: SKC, FEW, SCT, BKN, OVC 10. Temp/Dewpoint: 25/20 (degrees Celsius) 11. Altimeter Setting (ALSTG): (inches of Hg) Part I. Decoding Observations Basic NON-Weather data: 1. Report Type: METAR, SPECI, LOCAL 2. Station ID: KPOE, etc. 3. Date Time (Zulu): 24/1155z 4. Modifier: AMD, COR, AMD COR, RTD Basic Weather data:
5 Part I. Decoding Observations NON-Basic Weather data: These are examples of some less common codes for weather phenomena and observation criteria that will not be discussed in the length of this brief, due to uncommon usage.* * Links to applicable websites for uncommon observation/forecast decoding data will be provided at the end of the slideshow.
6 Part I. Decoding Observations Example Observations: 1. METAR (regular ob) 2. SPECI* (special ob) 3. LOCAL* (locally-sent ob) * SPECI and LOCAL observations will often contain less data than regular or METAR observations.
7 Part I. Decoding Observations Example Observations (cont d.): * All info below from METAR observation on second line (RJTY) 1. Report Type METAR 2. Station ID KPOE 3. Date Time Z 4. Modifier COR 5. Wind 02010G17KT 6. Visibility RVR N/A 8. Weather HZ 9. Sky Cond. SCT007, etc 10. Temp/Dp 20/ ALSTG A3019
8 Part II. Decoding Terminal Aerodrome Forecasts (TAFs) What types of data goes into a weather observation? Though it may look confusing, the data types entered for forecasts (TAFs) are virtually identical to those used in official weather observations. 1. Report Type TAF 2. Station ID CCCC 3. Date Time YYGGGG 4. Modifier COR, etc. 5. Wind dddff (KTs) 6. Visibility VVVV 7. RVR Not Used* 8. Weather w w 9. Sky Condition SKC, etc. 10. Max/Min Temp TT/GG (z) 11. ALSTG PPPP
9 5. Wind: 36009KT, VRB06KT 6. Visibility: 7sm, 9999 m 7. RVR: **NOT USED** 8. Weather: -RA, FG, +FC, etc. 9. Sky Cond: SKC, FEW, SCT, BKN, OVC 10. Temp/Dewpoint: 25/20 (degrees Celsius) 11. Altimeter Setting (ALSTG): (inches of Hg) Part II. Decoding Terminal Aerodrome Forecasts (TAFs) Basic NON-Weather data: 1. Report Type: METAR, SPECI, LOCAL 2. Station ID: KPOE, etc. 3. Date Time (Zulu): 24/1155z 4. Modifier: AMD, COR, AMD COR, RTD Basic Weather data:
10 Part II. Decoding Terminal Aerodrome Forecasts (TAFs) NON-Basic Weather data: These are examples of some less common codes for weather phenomena and observation criteria that will not be discussed in the length of this briefing* * Links to applicable websites for uncommon observation/forecast decoding data will be provided at the end of the slideshow.
11 Part II. Decoding Terminal Aerodrome Forecasts (TAFs) Example Forecast: Decoded Data: 1. Station ID: RODN, PAEI (2 separate ID s) 2. Date Time Group: (date missing) 15z 15z (24 hour period) 3. Wind: 06008KT (knots) 4. Visibility: 6000 (meters) 5. Sky Cond: BKN050 (hundreds of feet AGL) 6. ALSTG: QNH3008INS (inches of Hg) 7. BECMG: 1112 (Weather aft 12z)
12 Part III. De Ridder Air Field De Ridder Air Field (KDRI): Automated Weather Info and briefings available by phone: Toll-free #: (866) FAA INFORMATION EFFECTIVE 05 AUGUST 2004 Location FAA Identifier: DRI Lat/Long: N / W N / W / (estimated) Elevation: 202 ft. / 61.6 m (surveyed) Variation: 04E (1990)From city: 3 miles SW of DE RIDDER, LA
13 Part IV. Conclusion / Q & A Helpful Sites: National Weather Service: Air Force Publications: Site Forecasts (CONUS): De Ridder Air Field info: Congratulations!! You are now qualified to decode USAF weather observations and forecasts! Applicable Publications: AFMAN Surface Weather Observations AFMAN Meteorological Codes AFMAN Air and Space Weather Observations AFWA TN-98/002 Meteorological Tools
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