Weather Acronyms: U's

U/S	Unserviceable
UAB	Until advised by ...
UCP	Unit Control Position
UDDF	Up and down drafts
UFN	Until further notice
UIR	Upper flight information region
UKMET	United Kingdom METeorological Agency
ULJ	Upper Level Jet
UN	Unable
UNA	Unable
UNAVBL	Unavailable
UNEC	Unnecessary
UNKN	Unknown
UNL	Unlimited
UNREL	Unreliable
UNRELBL	Unreliable
UNRSTD	Unrestricted
UNSATFY	Unsatisfactory
UNSBL	Unseasonable
UNSTBL	Unstable
UNSTDY	Unsteady
UNSTL	Unsettle
UNSTLD	Unsettled
UNUSBL	Unusable
UPDFTS	Updrafts
UPR	Upper
UPSLP	Upslope
UPSTRM	Upstream
URG	Urgent
USACE	U.S. Army Corps of Engineers
USBL	Usable
USBR	U.S. Bureau of Reclamation
USFS	U.S. Forest Service
USGS	U.S. Geological Survey
UT	Utah
UTC	Coordinated Universal Time
UV	Ultraviolet
UVM	Upward Vertical Motion.
UVV	Upward Vertical Velocity
UVVS	Upward vertical velocities
UWNDS	Upper winds