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78 AFMAN15-111 12 MARCH 2019
SLPNO—Sea Level Pressure Not Available
SM—Statute Miles
SN—Snow
SNINCR—Snow Increasing Rapidly
SPECI—Aviation Selected Special Weather Report
SQ—Squall
SS—Sandstorm
SW—Southwest
SWAP—Severe Weather Action Plan
TCU—Towering Cumulus
TO—Technical Order
TS—Thunderstorm
TSNO—Thunderstorm Information Not Available
TWR—Tower
UNKN—Unknown
UP—Unknown Precipitation
UTC—Coordinated Universal Time
V—Variable
VA—Volcanic Ash
VC—In the Vicinity
VFR—Visual Flight Rules
VIS—Visibility
VISNO—Visibility at Secondary Location Not Available
VRB—Variable
VV—Vertical Visibility
W—West
WF/Det—Weather Flight/Detachment
WMO—World Meteorological Organization
WND—Wind
WSHFT—Wind Shift
Z—Zulu (e.g., Coordinated Universal Time)
