Page 86 - AFMAN 15-111, 12 MAR 2019

AFMAN15-111 12 MARCH 2019 83

Criteria Pertinent data Manual Automated Supplement Back-up

Number
Reference

the highest published instrument

landing minimum (including
circling) applicable to the airfield,
and no layer aloft was reported
below this height in the previous

METAR or SPECI.
4 Wind Shift Wind direction changes by 45 X X O X
degrees or more in less than 15
minutes and the wind speed is 10

knots or more throughout the wind
shift.
5 Squall When squalls occur. X X O X

6 Volcanic Eruption Eruption or volcanic ash cloud first X M X X
(See Remark 1, Table A3.1) noted.
7 Thunderstorm (occurring on station) A SPECI is not required to report X X X X
the beginning of a new

(1) Begins. thunderstorm if one is currently
reported.
(2) Ends.

8 Precipitation Note: Except for freezing rain,
freezing drizzle, hail, and ice
(1) Hail begins or ends. pellets, a SPECI is not required for X M X X
changes in type (e.g., drizzle
(2) Freezing precipitation begins, ends, or changing to snow grains) or the X M X X

changes intensity. beginning or ending of one type
while another is in progress (e.g.,
snow changing to rain and snow). X M X X