<s>
GRLevelX	B-Application
is	O
a	O
suite	O
of	O
data	O
processing	O
and	O
display	O
programs	O
developed	O
by	O
Gibson	O
Ridge	O
Software	O
,	O
LLC	O
(	O
GRS	O
)	O
,	O
to	O
view	O
weather	B-Application
radar	I-Application
data	O
.	O
</s>
<s>
It	O
is	O
used	O
by	O
professional	O
forecasters	O
and	O
researchers	O
for	O
general	O
precipitation	O
analysis	O
as	O
well	O
as	O
severe	O
storm	O
,	O
tornado	B-Language
,	O
and	O
tropical	O
cyclone	O
monitoring	O
and	O
analysis	O
.	O
</s>
<s>
Its	O
integrated	O
algorithms	O
flag	O
possible	O
hail	O
,	O
tornado	B-Algorithm
vortex	I-Algorithm
signatures	I-Algorithm
(	O
TVSs	O
)	O
,	O
and	O
mesocyclones	O
.	O
</s>
<s>
All	O
GRx	O
applications	O
are	O
written	O
in	O
multithreaded	B-Operating_System
C++	B-Language
using	O
the	O
base	O
Windows	B-Library
APIs	I-Library
.	O
</s>
<s>
GRLevel2	O
is	O
a	O
Windows	B-Application
viewer	O
for	O
live	O
and	O
archived	O
NEXRAD	B-Algorithm
Level	O
II	O
data	O
(	O
volumetric	O
reflectivity	O
and	O
velocity	O
data	O
)	O
.	O
</s>
<s>
Base	O
reflectivity	O
,	O
base	O
velocity	O
,	O
storm	O
relative	O
velocity	O
,	O
and	O
spectrum	O
width	O
sweeps	O
for	O
all	O
radar	B-Application
tilts	O
can	O
be	O
ingested	O
.	O
</s>
<s>
GRLevel2	O
Analyst	O
Edition	O
is	O
an	O
advanced	O
NEXRAD	B-Algorithm
Level	O
II	O
analysis	O
application	O
to	O
produce	O
a	O
high	O
quality	O
volumetric	B-Algorithm
display	I-Algorithm
and	O
several	O
high	O
resolution	O
reflectivity-derived	O
graphical	O
products	O
in	O
addition	O
to	O
the	O
standard	O
Level	O
II	O
data	O
products	O
.	O
</s>
<s>
Through	O
GIS	B-Application
implementation	O
,	O
several	O
University-Doppler	O
Radars	B-Application
can	O
be	O
viewed	O
,	O
such	O
as	O
the	O
University	O
of	O
Missouri	O
's	O
X-Band	B-Algorithm
Radar	I-Algorithm
.	O
</s>
<s>
GRLevel3	O
is	O
a	O
Windows	B-Application
viewer	O
for	O
live	O
NEXRAD	B-Algorithm
Level	O
III	O
data	O
from	O
the	O
NWS	O
Radar	B-Application
Product	O
Central	O
Collection	O
Dissemination	O
Service	O
(	O
already	O
produced	O
2D	O
images	O
)	O
.	O
</s>
<s>
In	O
addition	O
to	O
Level	O
III	O
WSR-88D	B-Algorithm
data	O
,	O
GR3	O
supports	O
TDWR	B-Algorithm
,	O
which	O
is	O
high	O
resolution	O
shorter	O
range	O
radar	B-Application
located	O
at	O
some	O
major	O
airports	O
.	O
</s>
<s>
Gibson	O
also	O
wrote	O
GREarth	O
,	O
which	O
overlays	O
satellite	O
and	O
other	O
data	O
and	O
,	O
like	O
the	O
GRLevelX	B-Application
radar	B-Application
viewers	O
,	O
is	O
customizable	O
with	O
GIS	B-Application
layers	O
.	O
</s>
<s>
In	O
reflectivities	O
,	O
GR2	O
extract	O
the	O
height	O
above	O
ground	O
of	O
the	O
highest	O
elevation	O
where	O
they	O
are	O
greater	O
than	O
18	O
dBZ	O
(	O
echo	O
tops	O
)	O
,	O
the	O
vertically	B-Algorithm
integrated	I-Algorithm
liquid	I-Algorithm
water	O
content	O
of	O
clouds	O
(	O
VIL	O
)	O
and	O
the	O
VIL	O
divided	O
by	O
the	O
Echo	O
tops	O
which	O
is	O
an	O
indicator	O
of	O
possible	O
large	O
hail	O
.	O
</s>
