Information

The intent of this weather site is to provide a complete source of graphical weather information. This is intended to satisfy the needs of the weather professional but can be a tool for the casual user as well.

General Information

February 19, 2018 at 11:58 AM

Welcome to the Unisys Weather Server. The intent of this weather site is to provide a complete source of graphical weather information. This is intended to satisfy the needs of the weather professional but can be a tool for the casual user as well. The graphics and data are displayed as a meteorologist would expect to see. For the novice user, there are detailed explanation pages to guide them through the various plots, charts and images. The URL for this site is http://weather.unisys.com. Once connected to the home page, you can traverse through the available documents, sub-documents and images.

WXP symbol legend

*This is an image containing many of the symbols WXP uses in the plots on this server.

All times listed on the plots will have the following format:

12Z 14 OCT 01

HHZ DD MMM YY

where: HH is the Universal Time DD is the day of the month MMM is the month of the year YY is the year.

Some plots will have a valid time listed such as:

24 hour Eta valid 12Z 14 FEB 02

The first part specifies how many hours beyond the initial time of observation the forecast is valid for. The label Eta specifies this is an Eta model result. The date/time data specifies the valid time, not the initial time.

Some plots will have local time listed such as:

4:00 PM EST [2100Z] 14 FEB 02

The plot is valid for 4PM EST on February 14. The value is brackets is the current Universal time (2100Z).

UTC - Universal Time

All weather information is tagged with the time of its observation or of its validity (for a forecast). For consistency, this is alway done using Greenwich Mean Time or Universal Time (UTC or Zulu time).

Time Zones

The Time Zones across North America and Pacific from East to West are:

Standard Daylight Savings

  Time Time
Atlantic AST -4 ADT -3
Eastern EST -5 EDT -4
Central CST -6 CDT -5
Mountain MST -7 MDT -6
Pacific PST -8 PDT -7
Alaska    
Hawaii    

GMT time can be derived from any local time using the following table:

Standard time:

GMT ATL EST CST MST PST ALA HAW
difference -4 -5 -6 -7 -8 -9 -10
00 8P* 7P* 6P* 5P* 4P* 3P* 2P*
01 9P* 8P* 7P* 6P* 5P* 4P* 3P*
02 10P* 9P* 8P* 7P* 6P* 5P* 4P*
03 11P* 10P* 9P* 8P* 7P* 6P* 5P*
04 12A 11P* 10P* 9P* 8P* 7P* 6P*
05 1A 12A 11P* 10P* 9P* 8P* 7P*
06 2A 1A 12A 11P* 10P* 9P* 8P*
07 3A 2A 1A 12A 11P* 10P* 9P*
08 4A 3A 2A 1A 12A 11P* 10P*
09 5A 4A 3A 2A 1A 12A 11P*
10 6A 5A 4A 3A 2A 1A 12A
11 7A 6A 5A 4A 3A 2A 1A
12 8A 7A 6A 5A 4A 3A 2A
13 9A 8A 7A 6A 5A 4A 3A
14 10A 9A 8A 7A 6A 5A 4A
15 11A 10A 9A 8A 7A 6A 5A
16 12P 11A 10A 9A 8A 7A 6A
17 1P 12P 11A 10A 9A 8A 7A
18 2P 1P 12P 11A 10A 9A 8A
19 3P 2P 1P 12P 11A 10A 9A
20 4P 3P 2P 1P 12P 11A 10A
21 5P 4P 3P 2P 1P 12P 11A
22 6P 5P 4P 3P 2P 1P 12P
23 7P 6P 5P 4P 3P 2P 1P

* represents previous day (i.e. 03 hours 23 January 93 is 8PM-MST 22 January)

Summertime (Daylight savings time) for those states that observe daylight savings time. For those that do not, use the standard time table all year:

GMT EDT CDT MDT PDT
difference -4 -5 -6 -7
00 8P* 7P* 6P* 5P*
01 9P* 8P* 7P* 6P*
02 10P*

9P*

8P* 7P*
03 11P* 10P* 9P* 8P*
04 12A 11P* 10P* 9P*
05 1A 12A 11P* 10P*
06 2A 1A 12A 11P*
07 3A 2A 1A 12A
08 4A 3A 2A 1A
09 5A 4A 3A 2A
10 6A 5A 4A 3A
11 7A 6A 5A 4A
12 8A 7A 6A 5A
13 9A 8A 7A 6A
14 10A 9A 8A 7A
15 11A 10A 9A 8A
16 12P 11A 10A 9A
17 1P 12P 11A 10A
18 2P 1P 12P 11A
19 3P 2P 1P 12P
20 4P 3P 2P 1P
21 5P 4P 3P 2P
22 6P 5P 4P 3P
23 7P 6P 5P 4P

 * represents previous day (i.e. 03 hours 23 June is 9PM-MDT 22 June)

Meteorology uses pressure as the vertical coordinate and not height. This works out better for thermodynamic computations that are done on a regular basis. Pressure decreases in the atmosphere exponentially as height increases reaching 0 pressure in space. The standard unit of pressure is millibars (mb or hectopascals-hPa) of which sea level is around 1015 mb. Standard pressure levels and approximate heights:

Pressure Approximate Height Approximate Temp
Sea level

0 m 0 ft

15 C 59 F

1000 mb

100 m 300 ft

15 C 59 F

850 mb

1500 m 5000 ft

5 C 41 F

700 mb

3000 m 10000 ft

-5 C 23 F

500 mb

5000 m 18000 ft

-20 C -4 F

300 mb

9000 m 30000 ft

-45 C -49 F

200 mb

12000 m 40000 ft

-55 C -67 F

100 mb

16000 m 53000 ft

-56 C -69 F

 

Wind       Temperature(F) ->

(knt) 40 35 30 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30
5: 36 30 24 18 12 6 0 -6 -12 -17 -23 -29 -35 -41 -47
10: 33 27 21 14 8 2 -5 -11 -17 -23 -30 -36 -42 -48 -55
15: 31 25 18 12 5 -1 -8 -14 -21 -27 -34 -40 -47 -53 -60
20: 30 23 17 10 3 -3 -10 -17 -23 -30 -37 -43 -50 -56 -63
25: 29 22 15 8 2 -5 -12 -19 -25 -32 -39 -46 -53 -59 -66
30: 28 21 14 7 0 -7 -14 -20 -27 -34 -41 -48 -55 -62 -68
35: 27 20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64 -71
40: 26 19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65 -73

 

Temp               Dew Point (F)

(F) 55.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0
65: 62.7 63.8 65.0 66.6        
70: 67.8 68.7 69.8 71.1 72.6      
75: 73.1 73.9 74.8 75.9 79.2 80.7    
80: 79.8 80.6 81.6 82.8 84.4 86.9 90.9  
85: 83.5 84.7 86.1 88.0 90.5 94.0 99.0 106.6
90: 87.9 89.4 91.2 93.6 96.9 101.2 107.2 115.6
95: 92.9 94.5 96.7 99.6 103.4 108.4 115.2 124.3
100: 98.1 99.9 102.4 105.6 109.8 115.3 122.7 132.3
105: 103.4 105.4 108.1 111.6 116.1 122.0 129.7 139.7
110: 108.7 110.9 113.8 117.5 122.3 128.4 136.3 146.5

 

Temp                Relative Humidity (%)

(F) 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0
65: 65.6 64.7 63.8 62.8 61.9 60.9 60.0 59.1 58.1
70: 71.6 70.7 69.8 68.8 67.9 66.9 66.0 65.1 64.1
75: 79.7 76.7 75.8 74.8 73.9 72.9 72.0 71.1 70.1
80: 88.2 85.9 84.2 82.8 81.6 80.4 79.0 77.4 76.1
85: 101.4 97.0 93.3 90.3 87.7 85.5 83.5 81.6 79.6
90: 119.3 112.0 105.8 100.5 96.1 92.3 89.2 86.5 84.2
95: 141.8 131.1 121.7 113.6 106.7 100.9 96.1 92.2 89.2
100: 168.7 154.0 140.9 129.5 119.6 111.2 104.2 98.7 94.4
105: 200.0 180.7 163.4 148.1 134.7 123.2 113.6 105.8 100.0
110: 235.6 211.2 189.1 169.4 151.9 136.8 124.1 113.7 105.8
115: 275.3 245.3 218.0 193.3 171.3 152.1 135.8 122.3 111.9
120: 319.1 283.1 250.0 219.9 192.9 169.1 148.7 131.6 118.2

Any value less than 80 is considered comfortable.
Any value greater than 90 is considered extreme.
Any value greater than 100 is considered hazardous.
Any value greater than 110 is considered dangerous.

Image Schedule (all times EST)

Date Type Update Times
Satellite data Every hour at :50
Surface data Every hour at :25
Upper Air data 2 times daily at 9:20
Radar data Every hour at :05, :35
NAM MOS data 2 times daily at 11:10
GFS MOS data 3:00 AM
NAM model data

2 times daily at 9:50

GFS model data 2 times daily at 11:50
RUC model data Every 3 hours at :45
ECMWF model data 2 times daily at 2:45
GFSX model data 3:10 AM
Hurricane data Every 3 hours
Archive data 2 times daily at 1:00

WXP (Weather Processor) Analysis Package

This provides information on the software package that is used to create all the images on this server.

Overview

WXP, the Weather Processor, is a suite of programs/toolkit for analyzing and displaying meteorological data and satellite images. WXP originated at Purdue University but is now being developed by Unisys. It is intended to be an general purpose weather visualization tool for near-realtime and archived meteorological data.

The software package handles data broadcast directly by the National Weather Service, reads in and files the data, decodes and parses the information and finally visualizes the data in a variety of formats. The primary audience for the package are meteorologists but is also developed to provide non-meteorologists the ability to view the data with varying degrees of complexity.

SFC map

Features

  • Ingest of National Weather Service (NWS) Data Feeds
    WXP offers data ingest programs which will read and save data from either old FOS (Family of Services) or NOAAPORT. The Unisys NOAAPORT ingest system is idealy suited to provide data to WXP.
  • Full Range of Data Types
    Use WXP to view and analyze:
    • Surface observations (SAO, METAR, SYNOP, SHIP, BUOY, DRIBU, CMAN)
    • Upper-air (TTAA, TTBB, TTCC, TTDD, PPAA, PPBB, PPDD, UUAA, UUBB, UUCC, UUDD)
    • Model Output Statistical (MOS/FOUS from NAM, GFS and other models)
    • Radar (MDR, RCM, NIDS (including NOAAPORT), WSI NOWRad, Kavouras Mosaic, Unisys Mosaic)
    • Satellite imagery (McIDAS AREA, NOAAPORT, Unisys Images)
    • Gridded numerical forecasts (GRIB from NCEP and NOAAPORT as well as most generic GRIB v1 and v2 products).
    • NLDN and NAPLN lightning data
    • Profiler data
    • SHEF, CLIMAT, hurricane data parsing
    • Text data such as watches, warnings, advisories and forecasts.
    • Decoders and Parsers
      WXP provides programs to decode data types such as METAR, SYNOP, Upper Air and GRIB data.  Also, WXP provides parsing programs to select specific text products from ingested data files such as forecasts, advisories and warnings.
    • Standard Meteorological Analysis Programs
      WXP includes routines for standard meteorological analyses:
      • Plotting and contouring (line and color-fill) of all data types
      • Regional, CONUS and international plotting of surface and upper air data
      • Plot station models for surface and upper air
      • Plots all general surface information including max/min temperature, precipitation and snow cover
      • Plots meteogram (time series of surface data) of observations and forecasts using MOS data
      • Plot upper air data on any pressure, height or isentropic level including freezing and tropopause levels
      • Plot upper air parameters for a specific level or layer
      • Plots most common used sounding and stability indices including LI, KI, precipitable water, CAPE, Helicity and shear
      • Plots derived parameters such as vorticity, convergence, isentropic lifting and Q vectors
      • Plots soundings using SkewT, Emagrams and Stuves
      • Plots, enhances and remaps satellite images
      • Plots MDR, RCM, NIDS radar data including vendor and WXP generated radar mosaics
      • Plots raw and derived GRIB model data
    • Output Devices
      WXP offers direct output to X windows and Win32 (Windows NT/XP), hardcopy output for Postscript and HPGL/PCL5, and metafile output. Also, WXP programs can directly generate GIF and PNG files.
    • Image Overlays
      WXP allows you to overlay graphic analyses based on a predetermined projection domain. This also includes navigated satellite images. Overlay products can be printed using PostScript and HPGL/PCL5 output programs.
    • Animation
      WXP can animate plots based on time (last 5 hours of data) or on forecast (every 6 hours into future).  Up to 200 frames can be used.
    • Multiple Interfaces
      WXP provides a set of simple text menus to quickly generate plots.  WXP is best used in scripts using the command line interface to create tailored graphics including overlays, loops and multipanel plots. Tailored plots can be automatically saved to image files for use on web servers.  A mouse-driven interface is available for interactive zoom, sounding modification and loop control.

Platforms:

UNIX/Linux
  • X86 systems running CentOS-5, RHEL3, and RHEL5

Minimum platform requirements are:

  • 256 MB RAM
  • 350 MB hard disk for binaries and database files
  • 2+ GB for realtime data storage (server space).
  • X11 Display System (standard on all systems)

Product Sales and Information:

Unisys Weather Information Services
ATTN: Sales
2476 Swedesford Road
Malvern, PA 19355
Email: sales-support@weather.unisys.com
Phone: 800-610-9473

Call for Price Quote

Technical Information:

Unisys Weather Information Services
ATTN: Meteorology
2476 Swedesford Road
Malvern, PA 19355
Email: technical-support@weather.unisys.com
Phone: 800-610-9473


Distribution:

Unisys licenses and distributes WXP. Binary only licenses are available for UNIX and Windows 95/98/NT platforms on a single machine or site license basis. Please call 800-610-9473 for specific pricing and license information.

WXP (binaries and database files) is available online from a password protected web site.
Current database files are available from Unisys Web server at http://weather.unisys.com/wxp/etc.

Documentation is available in HTML, PDF and hardcopy formats.

For More Information:

Visit the WXP Web server (http://weather.unisys.com) for samples of WXP output.


For further information about WXP, email technical-support@weather.unisys.com

NOAAPORT Information

This provides information on NOAAPORT data and ingest status. This is based on the WXP ingest of NOAAPORT feeds using the Unisys NOAAPORT Gateway system.

NWS NOAAPORT Users Guide