McIDAS-X User's Guide
Version 2024.1
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FRNTDISP
Displays
fronts from NCEP frontal positions products.
Format
FRNTDISP map time [keywords]
Parameters
map |
map
for the fronts; use any predefined map in the MAP command, e.g., MID,
USA, NA (default=do not draw map; use navigation of frame specified in
NAV keyword) |
time |
frontal
analysis time or model run time; specify as an hour, LATEST or FRAME (default=LATEST),
where:
hour = 0, 3, 6, etc.
LATEST = uses the latest analysis within
previous 6 hours
FRAME = uses the nearest analysis within
3 hours of the day and time of the image displayed in the frame |
Search Keywords
DAY= |
analysis
day or day of model run (default=current) |
FHOur= |
forecast
hour for forecast fronts; valid entries are 0, 12, 24, 36, or 48 (default=0
- analysis); not valid with FRAME time |
FILE= |
file
to read from if not using weather text dataset; the file must contain
only frontal positions products
(default=none - use weather text files) |
GROup= |
ADDE
group to search; the group name must be mapped with the DATALOC command
to a server with weather text data (default=RTWXTEXT for weather text;
FRONTS for reading from files) |
Navigation Keywords
NAV= |
frame
to use for navigation; specify a frame number or C for
the current frame (default=C); no map
is drawn; you cannot use this keyword unless the default is used for
the map parameter |
Display Keywords
BARbsiz= |
cold warm |
height
of cold and warm barbs (default=plot size dependent) |
BASe= |
length
of barb base on front (default=plot size dependent) |
COLor= |
hi low cold warm ocld stnry trof
graphics color level for each component (default=6 5 hi low 1 hi 3),
where: |
|
|
hi |
High
labels and pressure values |
|
|
low |
Low
labels and pressure values |
|
|
cold |
cold
front lines and barbs |
|
|
warm |
warm
front lines and barbs |
|
|
ocld |
occluded
front lines |
|
|
stnry |
stationary
front lines |
|
|
trof |
dashed
trough lines |
GRA= |
graphics
frame number to display output (default=current) |
LABel= |
'text' color line ele size
text, color, location and size for label, where: |
|
|
`text' |
label's
text; 72 characters maximum; specify an X without
quotes for default text (default=computed) |
|
|
color |
graphics
color level of label (default=3) |
|
|
line |
beginning
TV line to write label (default=top of frame) |
|
|
ele |
beginning
TV element to write label (default=left side of the frame minus the length
of the label) |
|
|
size |
size
of label text (default=plot dependent) |
LSIZE= |
hilo pres |
height
of High and Low labels, and pressure values (default=plot size dependent) |
LWIDth= |
front hilo pres |
line
width of front lines, High and Low labels, and pressure values (default=2
2 1) |
ORIent= |
cold warm ocld stnry
side of the cold, warm, occluded, and stationary front lines that
the barbs are drawn, as seen moving out from the Low; specify L for
the left side or R for the right side
(default=L L L L) |
OUTput= |
PLOT |
plot
the frontal positions (default) |
|
RAW |
list
the original text product |
|
TAB |
list
the decoded front point and High/Low positions in a tabular format |
SPAce= |
distance
between barbs along fronts (default=plot size dependent) |
Remarks
FRNTDISP
draws fronts using the NCEP frontal positions products issued under WMO headers
ASUS1 and FSUS2. It accesses these products through the ADDE server mapped
to the group name specified in the GROUP keyword.
The current
frontal time is defined to be that of the most recent front product received
if it falls within six hours of the current clock time.
The direction
that the cold and warm barbs face is defined by the front product. If the product
does not follow standard conventions, the barbs may face the incorrect way.
You change the direction that they face with the ORIENT keyword.
Examples
FRNTDISP
This entry
draws the fronts in the most recent NCEP frontal positions analysis product
(WMO header ASUS1) on the current frame. No map is drawn; the current frame's
navigation is used.
FRNTDISP USA
This entry
draws the fronts in the most recent NCEP frontal positions analysis product
(WMO header ASUS1) on a map of the United States.
FRNTDISP X FRAME NAV=8 GRA=8
This entry
draws, on graphics frame 8, the fronts in the NCEP frontal positions analysis
product (WMO header ASUS1) that is nearest in date and time to the image displayed
in frame 8.
FRNTDISP USA 0 FHOUR=24
This entry
draws the 24-hour forecast fronts in today's 00 UTC NCEP frontal positions
forecast product (WMO header FSUS2) on a map of the United States.
FRNTDISP OUT=RAW
This entry
lists the most recent NCEP frontal positions analysis product (WMO header ASUS1)
on the text window. No fronts are drawn on the graphics frame. If OUT=TAB is
specified instead of OUT=RAW, the data is listed in a decoded tabular format
that labels the latitude, longitude and pressure of each High and Low, and
the latitude and longitude for each point of the troughs and cold, warm, stationary
and occluded fronts.
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