Terms U

UV-C

UV-B

UV-A

UV and IR hygrometers

UV

urban–rural circulation

urban runoff

urban hydrology

urban effects

urban climatology

urban climate

urban canyons

urban canopy layer

urban canopy

urban boundary layer

upwind effect

upwind

upwelling

upvalley wind

upstream

upslope wind

upslope fog

uprush

upper-level trough

upper-level ridge

upper-level rainband

upper-level cyclone

upper-level chart

upper-level anticyclone

upper-air station

upper-air sounding

upper-air observation

upper-air disturbance

upper-air climatology

upper wind chart

upper front

Upper Atmosphere Research Satellite

upper atmosphere

upper air

upgradient flux

upglide cloud

updraft curtains

upbank thaw

unterwind

unsteady flow

unstable wave

unstable equilibrium

unstable channel

unstable air mass

unstable air

unsharp masking

unsaturated zone

unsaturated hydraulic conductivity

unsaturated flow

unrestricted visibility

unprotected thermometer

unlimited ceiling

universe

universal time

universal rain gauge

universal functions

United States Coast Pilot

unit storm

unit normal distribution

unit hydrograph

unimodal spectrum

uniform layer

uniform flow

unifilar electrometer

unidirectional vertical wind shear

unfreezing

unfiltered model

undulatus

undular bore

undisturbed motion

undermelting

undercurrent

undercast

undamped oscillation

unconfined aquifer

uncinus

uncertainty

Umkehr effect

ultraviolet radiation

ultraviolet

ultrasonic

ultrafine particles

ultra high frequency

ultimate infiltration capacity

Ulloa's ring

UHF

ubac

UARS

uala-andhi

U.S. airways code

u index