CHAPTER 16.   ENTRIES ON OBSERVATIONAL FORMS

16-1.     Introduction

16-2.     Entries on Meteorological Form 1M-10C (MF1M-10C)

16-3.     Writing Instrument

16-4.     Parenthetical Data

16-5.     Missing Data

16-6.     Late Observations

16-7.     Corrections

16-8.     Heading on Form MF1M-10C at LAWRS

16-9.     Heading on Form MF1M-10C at Other Stations (NA LAWRS)

16-10.   Entries on MF1M-10 by Columns

16-11.   Type of Observation (Column 1)

16-12.   Time of Observation (Column 2)

16-13.   Wind Direction (Column 3)

16-14.   Wind Speed (Column 4)

16-15.   Wind Gust (Column 5)

16-16.   Wind Variability (Column 6)

16-17.   Surface Visibility (Column 7a) Tower Visibility (Column 7b)

16-18.   Runway Visual Range (Column 8)

16-19.   Present Weather (Column 9)

16-20.   Sky Condition (Column 10)

16-21.   Temperature (Column 11)

16-22.   Dew Point Temperature (Column 12)

16-23.   Altimeter Setting (Column 13)

16-24.   Remarks (Column 14)

16-25.   Total Sky Cover (Column 17)

16-26.   Dry-Bulb Temperature (Column 19)

16-27.   Wet-Bulb Temperature (Column 20)

16-28.   Station Pressure (Column 22)

16-29.   Observers Initials (Column 15)

16-30.   Time (Column 26)

16-31.   Observation Number (Column 27)

16-32.   Maximum Temperature (Column 31) and Minimum Temperature (Column 32)
              (NA LAWRS)

16-33.   Precipitation (Column 33) (NA LAWRS)

16-34.   Snowfall (Column 34) (NA LAWRS)

16-35.   Snow Depth (Column 35) (NA LAWRS)

16-36.   Station Pressure (Column 36) (NA LAWRS)

16-37.   Barograph (Column 37) (NA LAWRS)

16-38.   Barograph Correction (Column 38) (NA LAWRS)

16-39.   24-Hour Maximum Temperature (Column 57) (NA LAWRS)

16-40.   24-Hour Minimum Temperature (Column 58) (NA LAWRS)

16-41.   24-Hour Precipitation (Column 59) (NA LAWRS)

16-42.   24-Hour Snowfall (Column 60) (NA LAWRS)

16-43.   Snow Depth (Column 61) (NA LAWRS)

16-44.   Remarks, Notes, and Miscellaneous Phenomena (Block 65)

16-45.   Additional Instructions for Part-Time Stations

16-46.   Hourly Wind Data

16-47.   Additive Data Groups (NA LAWRS)

16-48.   Tailoring MF1M-10C, Synoptic Data and Summary of the Day (NA LAWRS)

16-49.   Notice of Corrections to Weather Records

16-50.   Example Form

Figure 16-1.     WS Form B-14

Figure 16-2.     Example of Entries on MF1M-10C