Page 29 - AFMAN 15-111, 12 MAR 2019

AFMAN15-111 12 MARCH 2019 29

6.6.1. Active Runway and Equipment Changes. The Active Runway Columns provide a
record of the runway in use as reported by ATC personnel and weather sensor equipment used
for the reports at dual-instrumented airfields. Enter all times in UTC.
6.6.1.1. Each time the active runway is changed as reported by ATC personnel, enter the
runway number and the time the weather sensor is changed for dual instrumentation or the
time the runway is changed for single instrumentation.
6.6.1.2. The contraction “CONT” can be used instead of the time entry in the first line of
the day for a 24-hour duty station to indicate no change from the last entry on the preceding
day’s record.”

6.6.2. Remarks, Notes, and Miscellaneous Phenomena (Column 90). Use this column to
record information considered significant to surface weather observation procedures and to
elaborate on data recorded elsewhere on the form. Enter time to the nearest minute UTC.

6.6.2.1. Record conditions that affect the accuracy or representativeness of recorded data
(e.g., possible impact of construction, sensor maintenance or aircraft operations on sensor
readings, ice or snow accumulation on sensors).

6.6.2.2. Record outages and/or changes to meteorological sensors or systems identifying
the back-up equipment in use. Include the times of the change or outage affecting the
accuracy of the observations (e.g., 1953 FMQ-19 TEMP/DP SENSOR INOP, KESTREL
IN USE). When the outage carries over to subsequent days, include the date and month.
6.6.2.3. Document reasons for omission of mandatory data entries.

6.6.2.4. Record standard clock time checks.

6.6.2.5. Record changes in hours of weather station operation (e.g., effective dates and
times if temporary or date if permanent change).

6.6.2.6. Record miscellaneous items (e.g., time notified of an aircraft mishap).
6.6.2.7. Separate all entries with a semi-colon (;).

6.7. Synoptic Data. When no precipitation has occurred encode a “0,” when a trace has occurred
encode a “T,” prefix all estimated values with an “E.” Document the reason for an estimated
amount (e.g. “E - 1:14 RATIO USED”) in column 90. For accuracy, observe and take solid
precipitation/snow fall measurements from the same location each time. The location should
provide a horizontal and uniform distribution of solid precipitation accumulation. Avoid locations
with drifting snow and those affected by buildings, trees and non-natural heat sources (e.g. paved
surfaces). See Figure 6.1 for examples and entry format.

6.7.1. Columns 41 and 42 - Time (UTC and Local Standard Time [LST]). Note: LST is not
the same as local time during periods of Daylight Saving Time. LST is determined based on
longitude and a specified offset from UTC. LST always has the same offset from UTC for a
given location year-round.
6.7.1.1. Enter on the line captioned MID TO: (at units taking midnight LST observations)
the beginning times in UTC and LST of the first 6-hourly observation scheduled after 0000
LST. On the following four lines (captioned 1, 2, 3 and 4 in column 43), enter the beginning
time of each 6-hourly observation. Make all time entries in four figures to the nearest
minute UTC.